PLEASE HELP 20 PTS!!!
True or false
The following graph represents a maximum:
f(x)=3x^2+2

Answer: Please see explanation column for answer.

x= -36

Step-by-step explanation:

Step 1

from the attachment, Carlo solving is given as

1/3 (1/2x- 9) = 1/2 (x+18)

1/6x-3= 1/2x+9

1/4x-3=9

1/4x=12

x=48

Carlos error started when he subtracted wrongly 1/2 x from 1/6x which gave him 1/4 x instead of - 1/3 x.

Solving correctly, we have that

1/3(1/2x-9) = 1/2(x+18)

1/6x -3= 1/2x+ 9

taking like terms to like terms

1/6x-1/2x= 9+3

(1-3)/6x= 12

-2/6x= 12

-1/3x= 12

multiplying both sides by -3

-1/3x X -3 = 12 X -3

x= -36

Answer:

10,37

Step-by-step explanation:

for EF= [tex]\sqrt{17^{2} -14^{2} } =10[/tex]

for D= we have 2 knowns which are 53 and 90, so we need to minus them from each other to get D.  90-53=37

If the reaction was done with excess sodium bicarbonate, the amount of calcium chloride would determine the amount of precipitate produced.

The theoretical mass of precipitate produced in a reaction between calcium chloride and sodium bicarbonate can be calculated by using the balanced chemical equation for the reaction. The balanced equation for this reaction is given as follows:

CaCl₂ + NaHCO₃ → CaCO₃ + NaCl + H₂O

In this reaction, one mole of calcium chloride reacts with one mole of sodium bicarbonate to produce one mole of calcium carbonate precipitate, one mole of sodium chloride solution, and one mole of water.

The mass of the precipitate can be calculated by multiplying the molar mass of calcium carbonate by the number of moles of calcium carbonate produced.

So, to calculate the theoretical mass of precipitate produced, you need to know the amount (in moles) of calcium chloride and sodium bicarbonate used in the reaction. If the reaction was done with excess sodium bicarbonate, the amount of calcium chloride would determine the amount of precipitate produced.

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Explanation:

I appreciate you showing your work so far, and your thought process.

Your steps are correct because the events [tex]A \cup B[/tex] and [tex](A \cup B)'[/tex] are complementary, aka opposite. One or the other must happen. It's like a coin flip heads vs tails.

The last thing you need to do really is simplify 1-0.5-0.5+0.25 to get the final answer 0.25

-------------------

This is what I would do as an approach.

P(A u B) = P(A) + P(B) - P(A n B)

P(A u B) = 0.5 + 0.5 - 0.25

P(A u B) = 0.75

So,

P( (A u B)' ) = 1 - P(A u B)

P( (A u B)' ) = 1 - 0.75

P( (A u B)' ) = 0.25

-------------------

Another approach:

Imagine we had 100 people.

50 are in set A to give P(A) = 50/100 = 0.50

50 are in set B to give P(B) = 0.50

25 are in both A and B to get P(A n B) = 25/100 = 0.25

50+50-25 = 75 people are in either A, or B, or both

That leaves 100-75 = 25 in neither set

25/100 = 0.25

I recommend to draw out the Venn Diagram.

In this case, the marked price of 220 is the cost price and discount of 20% is announced on sales, so the selling price is 176.

The t-shirt costs $166.5 to purchase. To do this, multiply the listed price (220) by the discount rate (20%) stated as a decimal. This will give you the amount of the discount (0.20).

220*0.20 =44

The selling price is then determined by deducting the discount (44) from the marked price (220):

220-44 =176

Before applying any markups or reductions, the retailer paid the item's cost price, commonly referred to as the wholesale price. The price a consumer pays to purchase an item is known as the selling price. The selling price will be less than the advertised price if a discount is being offered, and the difference between the two represents the discount.

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The zeros of the function are -10 and +10

lesser x = -10

greater x = +10

The zeros of a quadratic equation are the points where the graph of the quadratic equation crosses the x-axis. . The zeros of quadratic equation will always have two values.

f(x) = 8x²- 800

f(x) = y

y = 8x²-800

when the graph crosses x axis the value of y = 0

therefore 0 = 8x²-800

divide both sides by 8

0 = x² - 00

x² = 100

x= √100

x= ±10

therefore lesser x = -10

greater 10 = +10

therefore the zeros of the quadratic equation f(x) = 8x²- 800 = +10 and -10

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The logarithmic function that describes the graph is given as follows:

[tex]f(x) = \log_2{(x + 1)}[/tex]

The parent logarithmic function is defined as follows:

f(x) = log(x).

Which, no matter the base, has the vertical asymptote given as follows:

x = 0.

The vertical asymptote of the graphed function is given as follows:

x = -1.

Hence:

[tex]f(x) = \log_a{(x + 1)}[/tex]

When x = 3, f(x) = 2, hence the base a is obtained as follows:

[tex]2 = \log_a{(4)}[/tex]

Meaning that:

a² = 4.

a = 2.

And the function is then defined as follows:

[tex]f(x) = \log_2{(x + 1)}[/tex]

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The answers to all parts are shown below.

To determine the quantity or percentage of something in terms of 100, use the percentage formula. Per cent simply means one in a hundred. Using the percentage formula, a number between 0 and 1 can be expressed. A number that is expressed as a fraction of 100 is what it is. It is mostly used to compare and determine ratios and is represented by the symbol %.

Given:

7. CP of sound system = 499

loss= 45%

So, the selling price = 499 - 45% of 499

                                  = R 274.45

8. original price is =1084

The new price = 1084 + 8% of 1084

                                  = R 1,170.72

9. Percentage decreased

= ( 747 - 599) / 747 x 100

= 19.81%

10. Mandisa left with

= 1000 - (228.95 + 573.38)

= R 197.67

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Answer:

170 miles

Step-by-step explanation:

Use 80 miles and 150 miles as the legs of a right triangle, and find the length of the hypotenuse using the Pythagorean theorem.

a² + b² = c²

80² + 150² = c²

6400 + 22500 = c²

c = √28900

x = 170

Answer: 170 miles

Answer:

a) The two variables are the number of years and the height of the tree in feet

b) It is a positive linear relationship.

c) Put a point at (0,3) and one at (3,7), and connect the dots.

The value of 21•15 equals (20+1)•15. This is true.

An expression is simply used to show the relationship between the variables that are provided or the data given regarding an information. In this case, it is vital to note that they have at least two terms which have to be related by through an operator. Some of the mathematical operations that are illustrated in this case include addition, subtraction, etc.

The value of 21•15 will be:

= 21 × 15

= 315

Also (20+1)•15 will be:

= 21 × 15

= 315

Therefore, they're equal.

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Complete question

The value of 21•15 equals (20+1)•15. True or false?

Answer:

2.50x + 1.25y ≤ 30

x + y ≥ 14

x ≤ 10 and y ≤ 24

Step-by-step explanation:

we can by elimination if we multiply the second inequality by -2.5, we get:

-2.50x - 2.5y ≥ -35

if we add the first inequality to the above we get:

   2.50x + 1.25y ≤ 30

+  -2.50x - 2.5y ≥ -35

-1.25y = -5

divide each side by -1.25 to get:

y = 4

therefore, x = 10

if you graph each system you must look for the area where the shading of each inequality overlaps

upon graphing, the solution is x ≥ 10 and y ≤ 24

Answer:

Always start with the first number. The one in 1.47 is less than the 4 in 4.01, so 1.47 is less than 4.01.

Least to greatest is 1.4, 1.47, 4.01, and 4.1

Given the expressions, f(x)=√x+5, g(x)=3x-7, and h(x)=5x, the answer to f(g(5)) is 8. This is because when g(5) is substituted into f(x) we get f(g(5))=f(3x-7)=√(3x-7)+5. When 5 is substituted for x, this simplifies to f(g(5))=√(-2)+5 which equals 8.

The answer to g(f(78)) is 60. This is because when 78 is substituted into f(x) we get f(78)=√78+5 which simplifies to f(78)=9. When 9 is substituted into g(x) we get g(f(78))=3x-7 which simplifies to g(f(78))=3(9)-7 which equals 60.

Finally, the answer to h(g(f(2))) is 83. This is because when 2 is substituted into f(x) we get f(2)=√2+5 which simplifies to f(2)=3. When 3 is substituted into g(x) we get g(f(2))=3x-7 which simplifies to g(f(2))=3(3)-7 which equals 8. When 8 is substituted into h(x) we get h(g(f(2)))=5x which simplifies to h(g(f(2)))=5(8) which equals 83.

In summary, the answers to f(g(5)), g(f(78)), and h(g(f(2))) are 8, 60, and 83 respectively.

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Answer:

slope = 1/2

Step-by-step explanation:

The slope formula:

The slope of a line that passes through points [tex] (x_1, y_1) [/tex] and [tex] (x_2, y_2) [/tex] is

[tex] slope = m = \dfrac{y_2 - y_1}{x_2 - x_1} [/tex]

To find the slope, we find two easy-to-read points. Easy-to-read points are usually on grid line intersections.

Points (0, 0) and (2, 1) are on grid line intersections and are easy to read.

We will now input the information from our two points into the slope formula to calculate the slope.

[tex] slope = m = \dfrac{1 - 0}{2 - 0} = \dfrac{1}{2} [/tex]

Let A be the point (-2, 9, 10) and n be the normal vector of the plane. The direction vector of the line is <1, 3, -3>, and since the plane is perpendicular to the line, n is orthogonal to the direction vector.

So, n is a vector that satisfies:

n . <1, 3, -3> = 0

The equation of the plane can be written in the form:

n . (x - A) = 0

Where x = (x, y, z) is any point in the plane.

We can find n by taking the cross product of two non-parallel vectors in the plane, such as <1, 0, 0> and <0, 1, 0>. Then,

n = (1, 0, 0) x (0, 1, 0) = (0, 0, 1)

Substituting the values of A and n into the equation of the plane, we get:

0 . (x - (-2, 9, 10)) = 0

0 . (x + 2, y - 9, z - 10) = 0

z - 10 = 0

z = 10

So the equation of the plane is:

z = 10

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let f = father's present age, let s = son's

:

write an equation for each statement, simplify

:

Three years ago a father was thrice as old as his son

f - 3 = 3(s-3)

f - 3 = 3s - 9

f = 3s - 9 + 3

f = 3s - 6

in 5 years time the father will be twice as his son

f + 5 = 2(s+5)

f + 5 = 2s + 10

f = 2s + 10 - 5

f = 2s + 5

replace f with 3s - 6, from the 1st statement

3s - 6 = 2s + 5

3s - 2s = 5 + 6

s = 11 yrs is the son's age

find the fathers age

f = 3(11) - 6

f = 33 - 6

f = 27 yrs is the father's age

:

what will be the sum of their age in four years

27+4 + 11+4 = 46

The line a and line c are perpendicular to each other.

Lines are known if they are parallel or perpendicular by there slopes.

Therefore, parallel lines have the same slopes and perpendicular have slopes that are negative reciprocals of one another.

The slope of a line is the change in the dependent variable to the change in the independent variable.

Therefore, let's find the slopes of each line.

line a:

slope = -3 - 1 / 6- 0  = - 4 / 6 = - 2 / 3

line b:

slope = -2 - 0 / 3 + 3 = - 2 / 6 = - 1 / 3

line c:

slope = 7 + 2 / 2 + 4 = 9 / 6 = 3 / 2

Therefore, line a and c are perpendicular

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Answer:

x = p(m-n)

Step-by-step explanation:

we can eliminate the 'p' in the denominator by multiplying each side of the equation by 'p' to get:

mp = np + x

now we can subtract 'np' from each side to get:

mp - np = x

we can further simplify it as:

p(m-n) = x

Answer:

X=n-p×m

Step-by-step explanation:

m=n-x/p

p×m=n-x

n-p×m=n+x-n

X=n-p×m

An inequality representing c, the total number of 150-kilogram crates that can be loaded into the shipping container: c ≤ 98

We know that an inequality is a mathematical statement that represents the inequalities between two algebraic expressions with two variables .

It is an unequal relation between two algebraic expressions.

Here, the greatest weight that can be loaded into the container = 26,000 kilograms

the weight of each crate = 150 kilogram

and the weight of other shipment = 11300 kilograms

Let c be the total number of 150-kilogram crates that can be loaded.

So, we get an inequality:

150 c + 11300 ≤ 26,000

150 c ≤ 26,000 - 11300

150 c ≤ 14700

c ≤ 98

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Answer:

1. y= (x-3)^2+5 vertex form

2. y= 2(x+2)^2+4 vertex form

3. y= 3x^2+18x+20 general form

4. y= x^2+4x+8 general form

The final balace in Tracy's bank account is $ 361.80.

In this question we must pay attention to every movement in a bank account and determine final balance within. The hint is having an active reading in the meaning of translating every Tracy's movement in additions and subtractions, First, we translate very sentence into numbers and signs:

Tracy's checking account: + $ 300.00

Tracy bought new sneakers: - $ 63.00

Tracy deposited a paycheck: + $ 43.25

Tracy wrote a check: - $ 17.75

Tracy wrote a check: - $ 9.45

Tracy made a withdrawal at her bank: - $ 20.00

Tracy deposited a paycheck: + $ 43.25

Tracy wrote a check: - $ 18.00

Tracy made a withdrawal at another bank: - $ 20.00 - $ 1.50

Tracy deposited her birthday money: + $ 125.00

Second, calculate the final balance in Tracy's account:

x = 300.00 - 63.00 + 43.25 - 17.75 - 9.45 - 20.00 + 43.25 - 18.00 - 20.00 - 1.50 + 125.00

x = 361.80

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Answer:

The correct answer is C. 1

Answer:

9y^8

Step-by-step explanation:

15/5 = 3

y^6 / y^2 = y^4

so you are looking at basically (3y^4)² = 3y^4 * 3y^4 = 9y^8

Answer:

Step-by-step explanation:

a)
0.5 x (a + b) x h
0.5 x (5 + 30) x 30
Area = 525

b) Overestimate

Answer: I believe it is A

The problem involving exponents (1/5 x 5)⁵ is calculated to get 1

Information made available in the question is an equation of the form

= (1/5 x 5)⁵

The math question is solved using the idea of PEMDAS which is an acronym for order of arrangement of mathematical operations as

the full meaning include

P - parenthesis

E  - exponents

M - multiplication

D - division

A - addition

S - subtraction

applying the sequence the problem is solved using parenthesis first

= (1/5 x 5)⁵

= (1)⁵

Then exponents

= (1)⁵

= 1 * 1 * 1 * 1 * 1

= 1

The solution is 1

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Answer:

- 14

Step-by-step explanation:

the bars around 2t , indicate the absolute value of 2t

the absolute value function always gives a positive value , that is

| - a | = | a | = a

so for example

| - 4 | = | 4 | = 4

given

[tex]\frac{2}{3}[/tex] p - | 2t | - s² ( substitute values for p, t and s into the expression )

= [tex]\frac{2}{3}[/tex] × 12 - | 2(- 3) | - (- 4)²

= 2 × 4 - | - 6 | - 16

= 8 - 6 - 16

= 2 - 16

= - 14

The marginal column total for the given data is option D: 39; 16.

What is marginal total?

A set of marginal totals is produced when the cell frequencies of a (multidimensional) contingency table are added over one or more of the classifying variables. The row and column totals are the marginal totals for a two-dimensional table.

The sum of the row entries or the sum of the column entries are called the marginal totals. Marginal distributions are computed by dividing the row or column totals by the overall total.

The number of men who prefer to eat fish = 11

The number of women who prefer to eat fish = 6

The number of men who prefer to eat red meat = 28

The number of women who prefer to eat red meat = 10

So, the marginal column total for the number of men who prefer to eat fish and red meat collectively is -

11 + 28 = 39

The marginal column total for the number of women who prefer to eat fish and red meat collectively is -

6 + 10 = 16

Therefore, the marginal total is 39, 16.

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The required number in which when subtracted from both 17 and 12 , the product will be 1.04  is  x = 11.8 or 17.2.

ax^2 + bx + c = 0 is a quadratic equation, which is a second-order polynomial equation in a single variable. a 0. It has at least one solution because it is a second-order polynomial equation, which is guaranteed by the algebraic fundamental theorem.

Let the number is x, then

(17 - x)(12 - x) = 1.04

204 - 17x - 12x + x² = 1.04

x² - 29x + 204 = 1.04

x² - 29x + 202.96 = 0

On solving for x, we get

x = 11.8 or 17.2

Thus, the number can be x = 11.8 or 17.2.

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The needed value is either x = 11.8 or 17.2, which when deducted from both 17 and 12 will result in a product of 1.04.

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