Since
lies in quadrant II and
lies in quadrant IV, we expect
,
, and
.
Recall the Pythagorean identities,

It follows that



Recall the angle sum identity for sine:

So we have

The inverse of the function f(x) = 2x - 10 is f-1(x) would be x/2 + 5.
Lets try to solve it,
We will be using the inverse function to solve this.
f(x) =
Replace f(x) with y.

Interchange x and y

Solve for y

Replace y with f-1(x).

Thus, the inverse of the function f(x) = 2x - 10 is f-1(x) = x/2 + 5
Learn more about inverse function on:
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5 units long because when you have a translation the length, size and shape of the segment doesn't change it's just moved over on the coordinate plane.
A) 62.5%
5 divided by 8 is 0.625, then multiply by 100 to get 62.5 :)