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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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At a summer camp,the ratio of campers to adults is kept equivalent to 7:1 use equivalent ratios to complete the table

Ulleksa [173]

14:2 , 21:3 , 28:4 . Multiply both sides by any number.

8 0

4 years ago

Find the exact value of cos(a+b) if cos a=-1/3 and cos b=-1/4 if the terminal side if a lies in quadrant 3 and the terminal side

maria [59]

Answer:

cos(a + b) = $\frac{1}{12}(1-2\sqrt{30})$

Step-by-step explanation:

cos(a + b) = cos(a).cos(b) - sin(a).sin(b) [Identity]

cos(a) = $-\frac{1}{3}$

cos(b) = $-\frac{1}{4}$

Since, terminal side of angle 'a' lies in quadrant 3, sine of angle 'a' will be negative.

sin(a) = $-\sqrt{1-(-\frac{1}{3})^2}$ [Since, sin(a) = $\sqrt{(1-\text{cos}^2a)}$ ]

= $-\sqrt{\frac{8}{9}}$

= $-\frac{2\sqrt{2}}{3}$

Similarly, terminal side of angle 'b' lies in quadrant 2, sine of angle 'b' will be negative.

sin(b) = $-\sqrt{1-(-\frac{1}{4})^2}$

= $-\sqrt{\frac{15}{16}}$

= $-\frac{\sqrt{15}}{4}$

By substituting these values in the identity,

cos(a + b) = $(-\frac{1}{3})(-\frac{1}{4})-(-\frac{2\sqrt{2}}{3})(-\frac{\sqrt{15}}{4})$

= $\frac{1}{12}-\frac{\sqrt{120}}{12}$

= $\frac{1}{12}(1-\sqrt{120})$

= $\frac{1}{12}(1-2\sqrt{30})$

Therefore, cos(a + b) = $\frac{1}{12}(1-2\sqrt{30})$

5 0

3 years ago

a store had a sale to celebrate veterans day. Every item in the store is advertised as 1/5 off the original price. If an item is

makkiz [27]

Answer:

$175

Step-by-step explanation:

let the original price be x

if 1/5 is off the price then the sells is at 4/5

4/5 of x = 140

thus,

4/5* x=140

4x = 140*5

x=700/4

x=$175

3 0

3 years ago

Y'all i need help immediately

adoni [48]

Answer:

Option B

Step-by-step explanation:

Don't trust answers teachers don't bother to spell correctly. Plus, finding the 100th term is very easy.

However, the explicit formula will take a long time to use, because it's explicit.

Option C is just wrong. You're supposed to multiply in the recursive formula.

Option D might be correct, but never trust those answers. Teachers do that to trip you up

3 0

3 years ago

What number is needed to complete the pattern below 66 73 13 21 52 _1020

Dimas [21]

<span>Answer 61 73-66= 7 21-13 = 8 ?? -52= 9 20-10 = 10 ??=61</span>

6 0

4 years ago