Each year, a physicist measures the remaining radioactivity in a sample. she finds that it reduces by 18% each year. if there was 1.52 g of radioactive material left after 4 years}
a. Find the initial quality of radioactive material
b. Hoy many more years will it take for the amount of radioactive material to reduce to 0.2 g?

Answer:

x=-8

Brief explanation:

Well I simplify first

4x-(9-3x)=8x-1

4x-9+3x=8x-1

then you do this operation called collecting similar terms

4x+3x-9=8x-1

7x-9=8x-1

7x-8x=-1+9

7x-8x=8

-x=8

--

Answer:

[tex] \sf \: x = - 8[/tex]

Step-by-step explanation:

Given equation,

→ 4x - (9 - 3x) = 8x - 1

Now the value of x will be,

→ 4x - (9 - 3x) = 8x - 1

→ 4x - 9 + 3x = 8x - 1

→ (4x + 3x) - 9 = 8x - 1

→ 7x - 9 = 8x - 1

→ 7x - 8x = -1 + 9

→ -x = 8

→ [ x = -8 ]

Hence, the value of x is -8.

Answer:

I

Step-by-step explanation:

owing a lot of money bc it hurts your credit score

The sum of the digits of the number 10302k, when k = 151,  is 157.

The smallest positive integer such that (2k)(5200) has 303 digits is k = 151. In order to calculate the sum of the digits of this number, we will first expand the expression (2k)(5200). This expression can be expanded to 10302k. The sum of the digits of this number is equal to 1 + 0 + 3 + 0 + 2 + k. Since k = 151, the sum of the digits of this number is equal to 1 + 0 + 3 + 0 + 2 + 151 = 157. Therefore, the sum of the digits of the number 10302k, when k = 151, is 157.

Learn more about sum of the digits here:

https://brainly.com/question/17608141

#SPJ4

The solutions to the simplification of the following surds are:[tex]-12\sqrt[3]{3}+4\sqrt[3]{2}[/tex] and [tex]-5x^2 y^2\sqrt[3]{3x^2y^2}[/tex]

A number without a root is simply referred to as a surd. These surds illustration comprises fractions as powers if presented in exponential form. There are three main forms of surds, according to the definition of surds.

The simplification of the given surds is carried out as follows:
[tex]-2\sqrt[3]{81} +2\sqrt[3]{16}-2\sqrt[3]{81}[/tex]

Factor 27 out of 81

[tex]-2\sqrt[3]{27*3} +2\sqrt[3]{16}-2\sqrt[3]{27*3}[/tex]

Rewrite it as 3³*3

[tex]-2\sqrt[3]{3^3*3} +2\sqrt[3]{16}-2\sqrt[3]{3^3*3}[/tex]

Rearrange and simplify

[tex]-2\sqrt[3]{3^3*3} -2\sqrt[3]{3^3*3}+2\sqrt[3]{16}[/tex]

Pull term out from the radical

[tex]-2*3\sqrt[3]{3} -2*3\sqrt[3]{3}+2\sqrt[3]{16}[/tex]

[tex]-6\sqrt[3]{3} -6\sqrt[3]{3}+2\sqrt[3]{16}[/tex]

Rewrite 16 as 2³*2

[tex]-6\sqrt[3]{3} -6\sqrt[3]{3}+2\sqrt[3]{2^3*2}[/tex]

Pull term out of the radical

[tex]-6\sqrt[3]{3} -6\sqrt[3]{3}+2*2\sqrt[3]{2}[/tex]

[tex]-6\sqrt[3]{3} -6\sqrt[3]{3}+4\sqrt[3]{2}[/tex]

Simplify altogether;

[tex]-12\sqrt[3]{3}+4\sqrt[3]{2}[/tex]

In [tex]\sqrt[3]{-375x^8y^8}[/tex]; simplify the radical by breaking the radicand up into a product of known factors, assuming real numbers.

[tex]\sqrt[3]{(-5) ^3(x^2)^3 (y^2)^3*3x^2y^2}[/tex]

[tex]\sqrt[3]{(-5x^2y^2) ^3*3(x^2y^2)}[/tex]

[tex]-5x^2 y^2\sqrt[3]{3x^2y^2}[/tex]

Learn more about the simplification of surds here:

https://brainly.com/question/27743084

#SPJ1

Answer:

-40F to 284F

Step-by-step explanation:

C = 5/9F -32

so F = 32+9/5*C

so the range is

F= 32+9/5*(-40) = 32-72 = -40F

F= 32+9/5*(140) = 32+252 = 284F

After 15 minutes of walking, Julia and Josie are facing each other at the same point (in distance).

Distance between Julia and Josie = 1,500 m

Julia's traveling rate (speed) per hour = 2,000 mph

Josie's traveling rate (speed) per hour = 4,000 mph

Walking time = 15 minutes

Distance formula = time x speed.

In 15 minutes, Julia's distance traveled = 500 m (2,000/60 x 15)

In 15 minutes, Josie's distance traveled = 1,000 m (4,000/60 x 15)

Thus, in 15 minutes, Julia and Josie have covered the 1,500 m distance separating them and will be at the same point.

Learn more about distance, time, and speed at https://brainly.com/question/26046491

#SPJ1

The types of solutes and their distribution between the ICF and ECF are not the same for the appropriate solute amounts to the ECF and ICF columns.

Intracellular fluids are fluids found inside the cell's cytoplasm while extracellular fluid are fluids the flow outside the cells which consist of plasma, interstitial and trancellular fluid

The types of solutes and their distribution between the ICF and ECF are not the same because intracellular fluid of the cystosol is composed of water, dissolved ions, small molecules, and large, water-soluble molecules while extracellular fluid consist of plasma, interstitial fluid and cytosol have high potassium concentration and low sodium Concentration.

learn more about of amount here

https://brainly.com/question/17312247

#SPJ4

So, the area of the stripe is 394.25= 282.75 square feet.

The stripe is a rectangle, with a width of 3 feet and a length that is the circumference of the cylinder. The diameter of the cylinder is 30 feet, so the circumference is 30pi=94.25 feet. So, the area of the stripe is 394.25= 282.75 square feet.

The white cylindrical silo has a red stripe painted on it, which makes two complete revolutions around the silo. The stripe is a horizontal rectangle with a width of 3 feet and a length equal to the circumference of the cylinder, which is calculated by multiplying the diameter of 30 feet by pi. The area of the stripe is the width of 3 feet multiplied by the length of 94.25 feet, which equals 282.75 square feet.

Learn more about Silo Stripe Area Calculation here:

https://brainly.com/question/16057589

#SPJ4

An equation 6(2x+4)²=(2x+4)+2 has degree 2, so it is quadratic equation. Therefore, option D is the correct answer.

The standard form of a quadratic equation is given as:

ax² + bx + c = 0 where a, b, c are real numbers and a ≠ 0.

Quadratics are the polynomial equation which has highest degree of 2.

A) x⁴-6x²-27=0

Here, the highest degree is 4 so, it is biquadratic equation.

B) 3x⁴=2x

3x³=2

Here, the highest degree is 3 so, it is cubic equation.

C) 2(x + 5)⁴+2x²+5=0

Here, the highest degree is 4 so, it is biquadratic equation.

D) 6(2x+4)²=(2x+4)+2

6(4x²+16x+16)=(2x+4)+2

24x²+96x+96=2x+4+2

24x²+94x+90=0

Here, the highest degree is 2 so, it is quadratic equation.

E) 6x⁴= -x²+5

6x⁴+x²+5=0

Here, the highest degree is 4 so, it is biquadratic equation.

F) 8x⁴+2x²-4x=0

Here, the highest degree is 4 so, it is biquadratic equation.

Therefore, option D is the correct answer.

Learn more about quadratic function here:

brainly.com/question/5428105.

#SPJ1

"Your question is incomplete, probably the complete question/missing part is:"

Select all of the following equation(s) that are quadratic in form.

a) x⁴-6x²-27=0

b) 3x⁴=2x

c) 2(x + 5)⁴+2x²+5=0

d) 6(2x+4)²=(2x+4)+2

e) 6x⁴= -x²+5

f) 8x⁴+2x²-4x=0

Considering the data we have been provided, we can build a multiple regression model as follows.

a.) In MS Excel, we enter the data set and utilize the "Correlation" option under Data > Data Analysis to create the correlation matrix and answer the question. The correlation matrix may be seen below.

[Fig. 1]

Correlation coefficients for at least one of the independent variables are larger than 0.7.

b.) We must look at the column labeled "Won" in the correlation matrix. The variables are Runs, Hits, Earned Run Average (ERA) and Walks if the criteria are 0.4.

c.) In MS Excel, we enter the data set and utilize the "Regression" option under Data > Data Analysis to create the regression model and answer the question. The result is shown below.

[Fig. 2,3,4]

Runs, ERA, and SO are all significant, with p-values less than 0.05. As a result, we recreate the regression model with these three independent variables.

[Fig. 5,6,7]

The right answer is Won = 80.321 + (0.101) X1 + (-14.276) X3 + (-0.011) X4.

The R2 value of the model is 0.948. This suggests that these factors can predict 94.8% of the number of victories. This model does not make use of the same variables as the previous one (b).

Read more about Correlation from:

https://brainly.com/question/30116167?referrer=searchResults

#SPJ4

De acuerdo con lo anterior, la respuesta correcta serían 270,000 es el precio más bajo que obtuvo para comprar un motor generador de ondas estacionarias para cuerdas en el primer almacén.

¿Cómo calcular cuál almacén le ofrece el precio más bajo a Juan?

Para calcular cuál es el almacén que le ofrece el precio más bajo a Juan debemos identificar a cuanto equivale el descuento y restarlo del precio total. Cuando sepamos el precio final comparamos para saber cuál de todos es el menor.

300,000 / 100 = 3,000

3,000 * 10 = 30,000

300,000 - 30,000 = 270,000

400,000 / 100 = 4,000

4,000 * 14 = 56,000

400,000 - 56,000 = 344,000

500,000 / 100 = 5,000

5,000 * 20 = 100,000

500,000 - 100,000 = 400,000

700,000 / 100 = 7,000

7,000 * 22 = 154,000

700,000 - 154,000 = 546,000

750,000 / 100 = 7,500

7,500 * 12 = 90,000

750,000 - 90,000 = 660,000

800,000 / 100 = 8,000

8,000 * 10 = 80,000

800,000 - 80,000 = 720,000

1'000.0000 / 100 = 10,000

10,000 * 6 = 60,000

1'000.000 - 60,000 = 940,000

1'200.000 / 100 = 12,000

12,000 * 4 = 48,000

1'200,000 - 48,000 = 1'152.000

1'500.000 / 100 = 15,000

15,000 * 2 = 30,000

1'500,000 - 30,000 = 1'270,000

De acuerdo a lo anterior, el precio más bajo para comprar un motor generador de ondas estacionarias para cuerdas es 270,000 en el primer almacén.

Nota: Esta pregunta está incompleta y tiene errores en los valores. A continuación esta la información completa y correcta.

Pregunta

¿Cuál tienda le ofrece el precio más bajo a Juan?

Precios

Almacén 1: 300 mil pesos con el 10% de descuento.

Almacén 2: 400 mil pesos con el 14% de descuento.

Almacén 3: 500 mil pero con el 20% de descuento.

Almacén 4: 700 mil pesos con el 22% de descuento.

Almacén 5: 750 mil pesos con el 12% de descuento.

Almacén 6: 800 mil pesos con el 10% de descuento.

Almacén 7: 1'000.000 de pesos con el 6% de descuento.

Almacén 8: 1'200.000 de pesos con el 4% de descuento.

Almacén 9: 1'500.000 de pesos con el 2% de descuento.

Aprenda más sobre descuentos en: https://brainly.com/question/24130820

#SPJ1

Answer:

$132

Step-by-step explanation:

Looks like $22.00 was the price at 100%

The owner marks the price down by 40%, making the total price 60% of $22 because 100%-40% is 60%

We can set up a ratio

60%. X

-------. =. ------

100%. $22

Cross multiplying makes it (100)(x) = (60)(22)

100x = 1,320

Dividing both by 100 to get X alone

x = 13.2

Each shirt is now $13.20

Last, but not least, we multiply by 10 because he sold 10 shirts

= $132

The percent of increase from 60 to 70 rounded to the nearest percent is 17%.

Percent​ increase is simply the amount of increase from the initial value to the new value in terms of 100 parts of the initial value.

It is expressed as;

C = ((x₂ - x₁) / x₁)100%

Where x₁ is initial value and x₂ is new value

Given that;

Plug in the given values and solve for C.

C = ((x₂ - x₁) / x₁)100%

C = ((70 - 60) / 60) × 100%

C = ( 10 / 60) × 100%

C = 1/6 × 100%

C = 17%

Therefore, the percentage increase is 17%.

Learn more about Percentages here: brainly.com/question/24159063

#SPJ1

Answer: B - 11

Step-by-step explanation:  Hello! How you can do this is by substituting A, B, C, and D for x.

D:

4(16)<45
64<45

64 is not less than 45, so this is false.  D is not the answer.

C:
4(13.5)<45
54<45

54 is not less than 45, so this is false.  C is not the answer.

A:
4(12)<45
48<45

48 is not less than 45, so this is false.  A is not the answer.

B:
4(11)<45
44<45

44 is less than 45 so this is true.

The answer is B - 11.

Answer:

The statement "The series converges by the Integral Test" is true. The Integral Test is a method used to determine the convergence or divergence of a series. The test states that if the series is of the form:

∑(f(n))

where f(n) is a positive and continuous function defined for n ≥ 1 and is decreasing for n ≥ 1, then if the integral of f(n) from 1 to infinity converges, the series also converges. If the integral diverges, the series diverges.

It is important to note that the Integral Test is only one method of determining the convergence or divergence of a series and that it has some limitations such as it only works when the function f(n) is positive and decreasing. Also, the test is only inconclusive if the necessary conditions are not met, so statement 4 and 5 are not true.

Answer:

Step-by-step explanation:You should notice because you're in the class you should notice because the teachers are obviously teaching this because they wouldn't just give you something that they didn't cheat so if you sleep in class or like not paying attention speak into a friend or like something like doing something in my pay attention you ain't getting no you ain't getting nothing.

Computed the probabilities P(z < -1.0)=0.1587, P(z > -1.0)=0.8413, P(z < -1.5)=0.0668, P(z < -2.5)=0.0062, P(-3 < z < 0)=0.4987.

What is deviation ?

Deviation refers to how far a value or set of values is from the mean or average. In statistics, the standard deviation is a measure of the spread of a dataset, calculated as the square root of the variance. It represents the average distance of each data point from the mean. A low standard deviation indicates that the data points tend to be close to the mean.

To compute the probabilities for a standard normal random variable, we can use a standard normal table or a calculator with standard normal distribution functions.

P(z ? -1.0) = P(z < -1.0) = 0.1587

P(z ? -1.0) = P(z > -1.0) = 1 - 0.1587 = 0.8413

P(z ? -1.5) = P(z < -1.5) = 0.0668

P(z ? -2.5) = P(z < -2.5) = 0.0062

P(-3 < z ? 0) = P(-3 < z < 0) = P(z < 0) - P(z < -3) = 0.5 - 0.0013 = 0.4987,

Computed the probabilities P(z < -1.0)=0.1587, P(z > -1.0)=0.8413, P(z < -1.5)=0.0668, P(z < -2.5)=0.0062, P(-3 < z < 0)=0.4987.

To learn more about deviation visit : brainly.com/question/23907081

#SPJ4

The constant of proportionality in this proportional relationship is 5/4.

An equation is a mathematical statement that is made up of two expressions connected by an equal sign.

Example:

2x = 5 is an equation.

We have,

Let the proportional equation be y ∝ x.

y = kx

From the table,

When x = 2, y = 5/2

This means,

5/2 = 2k

k = (5/2)/2

k = 5/4

Now,

When x = 2(1/2), y = 25/8

k = y/x

k = (25/8)/(5/2)

k = 25/8 x 2/5

k = 5/4

We see that,

k = 5/4

Thus,

The constant of proportionality is 5/4.

Learn more about equations here:

https://brainly.com/question/17194269

#SPJ1

As the company asset other than investment securities cost $50,000 and market value of the assets is $75 million. The assets will be recorded and reported as at $75,050,000.

An asset is a resource with monetary value that an individual, corporation, or country owns or controls with the expectation of future benefit. An asset is anything that can generate cash flow, reduce expenses, or increase sales in the future, whether it's manufacturing equipment or a patent.

A company's assets are reported on its balance sheet. They are divided into four categories: current, fixed, financial, and intangible. They are purchased or created in order to increase the value of a company or to benefit its operations.

The reported asset of the company will be:

= $50,000 + $75 million

= $75,050,000

Read more about asset

brainly.com/question/11556132

#SPJ1

Probability of waiting between 15 and 30 seconds and probability of waiting for more than 2 minutes are 0.2462 and 0.0099 respectively.

Given that,

Do you find lines to be tedious? The grocery store chain Kroger has reduced the average wait time for customers at 2300 locations by using computer modeling and information technology. Kroger was able to reduce the typical customer wait time to to 26 seconds thanks to a new system called QueVision that helps the retailer to better anticipate when customers would be checking out.

P(Wait between 15 and 30 seconds)

= [tex]\int{15}{30} \frac{e^{-x/26}}{26} dx[/tex]

= 0.2462

P(wait for more than 2 minutes)

= 1 - P(Wait for less than or equal to 120 seconds)

= 1 - [tex]\int{0}{120} \frac{e^{-x/26}}{26} dx[/tex]

= 0.0099

As a result, the probabilities of waiting between 15 and 30 seconds and longer than 2 minutes are, respectively, 0.2462 and 0.0099.

To know more about Probability click here:

brainly.com/question/30034780

#SPJ4

Answer:

C

Step-by-step explanation:

If two lines are parallel, then corresponding angles are congruent.

OR

If two lines are NOT parallel, then corresponding angles are NOT congruent.

So compare these 2 to the answers.  Only C is right.

The reciprocal of that fraction is 2/21.

The inverse of a value or a number is how reciprocal is commonly used in mathematics. The reciprocal of n will be 1/n if n is a real number. In other words, we must change the number to be inverted. One divided by nine, or 1/9, is the reciprocal of nine, for instance. A value of one is produced when we multiply a number by its reciprocal. The term multiplicative inverse is another name for it.

reciprocal is simply defined as the inverse of a value or a number. If n is a real number, then its reciprocal will be 1/n. It means that we have to convert the number to the upside-down form.

Using the given functions to set up and simplify 1-2

10=1-2=-1

To learn more about reciprocal refers to;

brainly.com/question/1975871

#SPJ1

The numbered spot at which all the runners will be next to one another is spot 19.

Least Common Multiple is the meaning of the acronym LCM. The lowest number that may be divided by both numbers is known as the least common multiple (LCM) of two numbers. It may also be computed using two or more real numbers.

Starting with the runner on the outside track, the provided parameters are;

The runner covered n₁ = 5 places on the outside track, which is the number of spaces.

Next, the inner runner will traverse n₂ spaces, which equals one space.

The following inner runner will cover n₃ = 3 spaces.

The subsequent runner will traverse n₄ = 2 spaces.

The Lowest Common Multiple, or LCM, of all the runners' speeds or the total number of spaces they cover in the same amount of time, determines where all the runners will be placed next to one another.

LCM(5, 1, 3, 2) = 30 is the LCM of 5, 1, 3, and 2.

Time = 30/ = 6

Consequently, when the first runner has covered 30 places, we have;

Six time units have been expended.

The runner comes to a stop at position 30- (30 -19) = Position 19.

First runner's new destination is Spot 19.

The distance covered simultaneously by runner 2 is 6 x 1 = 6.

The distance covered by two runners running simultaneously equals six spaces.

Second runner's new position: 6 spaces plus spot 13 equals spot 19.

The combined distance covered by the three runners is 6 x 3 = 18.

The distance runner 3 covers 18 spaces simultaneously.

Third runner's new position: 18 spaces + Spot 1 = 19 spaces

Runner 4 covers a distance of 6 x 2 = 12 at the same time.

Distance runner 4 journeys equals 12 spaces

Runner 4's new position is now 12 spaces Plus Spot 7 = Spot 19.

Therefore, all the runners will be next to one another is spot 19.

To learn more about the LCM;

https://brainly.com/question/20739723

#SPJ1

Only setup A places the mouse on the bottom right square and the cat there.

The pattern is continued, so we have to define where the cat and mouse would be after the 247th move.

Divide the issue into two parts: the location of the mouse and the location of the cat after the 247th move.

Every cycle, which consists of four different positions for the cat, is repeated once every four movements. When 247 is divided by 4, the remainder is 3. This matches the bottom right corner, where the cat is located after the third move.

Similar to the mouse, which repeats every eight moves, the mouse has eight possible places in a single cycle. When 247 is divided by 8, the remainder is 7. This matches the rat's bottom left corner position after the seventh motion.

The only configuration with the cat in the bottom right square and the mouse in that position is A.

To learn more about solving the pattern link is here

brainly.com/question/14396991

#SPJ4

The complete question is given below:

An equation is said to be linear if each term has a maximum of one degree.The system of linear equations is solved by (2,6).

An equation is said to be linear if each term has a maximum of one degree.

It is possible to formulate linear equations in the form y=mx+c.

A straight line results from a linear equation with two variables when its axes are plotted on the cartesian plane.

When the second equation for x is solved,

x + 5y = 32

x = 32 - 5y

Add the value of x to the first equation now,

2(32 - 5y) + 5y = 34

64 - 10y + 5y = 34

-5y = -30

y = 6

the value of y should be replaced in any one of the equations,

x + 5y = 32

x + 5(6) = 32

x = 2

Consequently, the system of linear equations' solution is (2,6).

To learn more about  linear equations refer

https://brainly.com/question/25858757

#SPJ1

Answer:

Step-by-step explanation:

Its the second one

Answer: -1/3 > -2/5

Step-by-step explanation:

If we put them as common denominators we can solve this. To do that look at this:

-1/3 = -5/15
-2/5 = -6/15
So we can see that -2/5 is smaller

I hope this was able to help you :D

Answer: 4x + 4y - 8

Step-by-step explanation:

4(x−2+y)

4x -8 +4y

4x + 4y - 8

Answer:

(a) Since y varies directly with x, hence, y = kx, where k is a constant.

(b) When x = 20, y = 4

    20k = 4

     ∴ k = 0.2

∴ When x = 9,

y = 9(0.2)

y = 1.8

13 c is equal to 48.775 L.

Equality in math is a concept that states that two expressions, equations, or values are equal to each other. Equality is symbolized by the equals sign “=.” Equality is a fundamental law of mathematics, and it is used in a variety of contexts and equations. Equality can be used to compare two different objects, or to set a value for a single object. Equality can also be used to determine if two equations are equivalent. Equality is an important concept in mathematics, as it allows us to find solutions to difficult problems.

5 gallons (gal) is equal to 18.925 liters (L). Therefore, 13 c is equal to 48.775 L.

To know more about equality click-
https://brainly.com/question/28293087
#SPJ1

The customer purchased 14 face masks and 8 hand sanitizers.

A system of linear equations consists of two or more equations made up of two or more variables such that all equations in the system are considered simultaneously. The solution to a system of linear equations in two variables is any ordered pair that satisfies each equation independently.

Given that, Maleri Designs sells cartons of cloth face masks ($12) and cartons of hand-sanitizer ($6) on eBay.

Let the number of face masks be f an the number of hand-sanitizers be h.

One of their customers, Mod World, purchased 22 cartons for $216.

Now, f+h=22 --------(I) and

12f+6h=216 --------(II)

f=22-h

Substitute f=22-h in equation (II), we get

12(22-h)+6h=216

264-12h+6h=216

264-216=6h

6h=48

h=8

Substitute h=8 in equation (I), we get

f+8=22

f=14

Hence, the customer purchased 14 face masks and 8 hand sanitizers.

To learn more about the linear system of an equations visit:

https://brainly.com/question/27664510.

#SPJ1

The cost for the flooring of the rectangular room is $864.

Multiplication of two numbers is defined as the addition of one of the number repeatedly until the times of the other number.

a × b means that a is added to itself b times or b is added to itself a times.

Given that,

Dimension of each time = 1 foot

Length of the room = 18 feet

Width of the room = 12 feet

Number of tiles needed for the room = 18 × 12 = 216

Cost of one tile = $4

Total cost for the tile = 216 × $4 = $864

Hence the total cost for the tiles is $864.

Learn more about Multiplication here :

https://brainly.com/question/24327297

#SPJ1