Answer:
For #4 use this as an example:
The ladder positioned against the wall forms a right triangle. You are trying to find the length of the ladder, which is the hypontenuse of the triange. 24 ft is a leg length, as well as 7ft. Use the pythagorean theorem to solve this problem. A^2+b^2=C^2
24^2+7^2=C^2 Plug in the given values.
576+49=C^2 Square the pieces.
625=C^2 Combine the squared pieces.
25=C Take the square root of both sides.
The length of the ladder is 25 ft.
6. 36.9*
7. 40*,50*,90*
Hope that helps :)