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3 years ago

Please help me. It’s from my math class

Mathematics

2 answers:

serg [7]3 years ago

8 0

Answer:

he would need about 16 weeks

Flauer [41]3 years ago

5 0

Answer:

1-72: Estimate- 15 weeks

Actual- $125/$7.75= 16.13 weeks.

1-73: 3 feet long=36 inch board

6 feet long=72 inch board

12 feet long = 144 inch board

1-74: a. 100, 50, 60, 40, 20, 0

b. 75, 60, 45, 30, 15, 0

c. 125, 100, 75, 50, 25, 0

d. 250, 200, 150, 100, 0

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In the diagram, the radius of the outer circle is 2x cm and

hodyreva [135]

Area shaded = Area big circle- Area of small circle;

200 pi= pi•(2x)^2 -pi•6^2;

200pi= pi•4x^2 -pi•36;

200pi=pi•4(x^2 -9) divide both sides by 4pi;

50=x^2 -9; So x=sqrt(59)~7.68cm

8 0

3 years ago

Find the value of a and of b for which<br>(a) the solution of x2 + ax < b is<br>-2<x < 4

KengaRu [80]

Answer: $a = -2$

$b = 8$

Step-by-step explanation:

Given :

$x^{2} +ax$

re - writing the equation , we have

$x^{2} +ax-b$

we need to find the value of a and b for which -2<x < 4 , this means that the roots of the quadratic equation are -2<x < 4.

The formula for finding the quadratic equation when the roots are known is :

$x^{2}$ - sum of roots(x) + product of root = 0

sum of roots = -2 + 4 = 2

product of roots = -2 x 4 = -8

substituting into the formula , we have:

$x^{2} -2x-8=0$ , which could be written in inequality form as

$x^{2} -2x-8$

comparing with $x^{2} +ax-b$ , it means that :

$a = -2$

$b = 8$

3 0

3 years ago

G(x)=x3+6x2+12x+8 when x=-1

beks73 [17]

G=38
Whenever you divide or multiply by one the number stays the same, therefore just take out all the xs and then solve the equation. I hope this helps!

3 0

3 years ago

1: Ken earned $176 from his part-time job this summer. He spent 25% of his money on games. He is going to donate 14 of the rema

tatiyna

The charity will receive $ 11

<h3><u>Solution:</u></h3>

Ken earned $176 from his part-time job this summer

Amount earned = $ 176

He spent 25% of his money on games

Therefore,

Money spent on games = 176 - 25 % of 176

$\text{Money spent on games } = 176 - \frac{25}{100} \times 176\\\\\text{Money spent on games } = 176 - 0.25 \times 176\\\\\text{Money spent on games } = 176 - 44\\\\\text{Money spent on games } = 132$

He is going to donate 1/4 of the remaining money to charity

Reamining amount = 176 - 132 = 44

Therefore,

$Money\ given\ to\ charity = \frac{1}{4} \times 44 = 11$

Thus he gave $ 11 to charity

8 0

3 years ago

Equation of the line that goes through the points (0, -2) and (-5, 3).

garik1379 [7]

Answer:

3,5

Step-by-step explanation:

6 0

3 years ago