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saw5 [17]
3 years ago
13

Me again.. can someone please help me with this? It's trigonometry, and I'm not very good at it...

Mathematics
1 answer:
hodyreva [135]3 years ago
8 0
Check the picture below.

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Amy and Stephanie were playing a number game. Amy picked a number and told Stephanie that if she added 9 to the number and multi
mrs_skeptik [129]

Answer:

A. 2(x + 9) = 8

Step-by-step explanation:

To solve this problem, we proceed as follows:

- We call "x" the number picked up by Amy:

x

- Amy then adds 9 to this number, so we get:

x+9

- Then, we multiply this sum by 2, so we get:

2(x+9)

- Finally, Amy says that this number is equal to 8:

2(x+9)=8

So the correct equation is

A. 2(x + 9) = 8

We can even solve it to find the number. We get:

2(x+9)=8\\2x+2\cdot 9 = 8\\2x+18=8\\2x+18-18=8-18\\2x=-10\\x=\frac{-10}{2}=-5

5 0
3 years ago
A rectangular box has a base that is 4 times as long as it is wide. The sum of the height and the girth of the box is 200 feet.
enyata [817]

Answer: V(W) = (1/3)*(*W^2*800ft - 8W^3) and the domain is 0 < W < 100ft.

Step-by-step explanation:

The dimensions of the box are:

L = length

W = width

H = heigth.

We know that:

L = 4*W

And the girth of a box is equal to: G = 2*W + 2*H

then we have:

2*W + 2*H + H = 200ft

2W + 3*H = 200ft

Then we have two equations:

L = 4*W

2W + 3*H = 200ft

We want to find the volume of the box, which is V = W*L*H

and we want in on terms of W.

Then, first we can replace L by 4*W (for the first equation)

and:

2*W + 3*H = 200ft

3*H = 200ft - 2*W

H = (200ft - 2*W)/3.

then the volume is:

V(W) = W*(4*W)*(200ft - 2*W)/3

V(W) = (1/3)*(*W^2*800ft - 8W^3)

The domain of this is the set of W such that the volume is positive, then we must have that:

W^2*800ft > 8W^3

To find the maximum W we can see the equality (the minimum extreme is 0 < W, because the width can only be a positive number)

W^2*800ft = 8W^3

800ft = 8*W

100ft = W.

This means that if W is equal or larger than 100ft, the equation gives a negative volume.

Then the domain is 0 < W < 100ft.

6 0
3 years ago
Can someone please help me!
maks197457 [2]
2500
34420
4.59*10^9
3.442*10^4
6 0
3 years ago
Read 2 more answers
28 - 2 (5a - 3) = 47
Alex787 [66]

Answer: a=-1.3

Step-by-step explanation:

1) Reorder the terms: 28 + (-3 * -2 + 5a * -2) = 47

28 + (6 + -10a) = 47

2) Solving: 34 + -10a = 47

3) Add -34 to each side of the equation: 34 + -34 + -10a = 47 + -34

4) Combine like terms: 34 + -34 = 0: 0 + -10a = 47 + -34

-10a = 47 + -34

5) Combine like terms: 47 + -34 = 13: -10a = 13

6) Divide each side by -10: a = -1.3

5 0
3 years ago
Please helpppppppppppppppppppppppppppppppppppp
valentina_108 [34]

Answer:

the answer is 6.33 = y for this

4 0
2 years ago
Read 2 more answers
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