If f(x)=4x+5 and fog(x)=8x+13, find the value of x such that gof(x)=28

Bring the fraction a/a-4 to a denominator of 16-a^2

You're locked out of your house. the only open window is on the second floor, 25 feet above the ground. there are bushes along the edge of the house, so you will need to place the ladder 10 feet from the house. what length ladder do you need to reach the window?

Rounded to the nearest tenth, what is the value of x