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4 years ago

13

Which expression is equivalent to 6 minus (negative 8)?Negative 6 + 8Negative 6 + (negative 8)6 + (negative 8)6 + 8

1 answer:

Lerok [7]4 years ago

4 0

Answer:

Negative 6) (4) + (negative 6) (two-thirds)

(Negative 6) (4) times (negative 6) (two-thirds)

(Negative 6 + 4) + (Negative 6 + two-thirds)

(Negative 6 + 4) times (negative 6 + two-thirds)

himselfvlix

Answer is A

Step-by-step explanation:

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(20 pts!) if the base of the roof has length 40 feet and x=30, which of the following gives the height of the roof?

musickatia [10]

Answer:

23.094 ft approximately

(If you want your answer in a different format, let me know please.)

Step-by-step explanation:

I would have solve this using tangent since the side opposite to x is asked for and the adjacent side to side is given as having a measurement of 40 ft.

But I think they want you to use the formula:

$l=\frac{b}{\cos(x)}$ .

$l=\frac{40}{\cos(30)}$

Input into calculator:

$l=46.188$ (approximation)

l represents the length of the roof.

So we have l=46.188 and b=40.

We must use the Pythagorean Theorem to find the height,h, for of the roof.

l is the hypotenuse.

$h^2+40^2=46.188^2$

$h^2+1600=2133.331$

Subtract 1600 on both sides:

$h^2=533.331$

Take square root of both sides:

$h=23.094$

The answer is 23.094 feet for the height that roof reaches on the building.

I want to show you another way:

$\tan(x)=\frac{\text{opposite}}{\text{adjacent}}$

$\tan(30)=\frac{h}{40}$

Multiply both sides by 40:

$40\tan(30)=h$

Input into calculator:

$23.094=h$

I didn't do it this way because your problem suggested you use their formula to find the height.

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