3. A children's slide is 10 feet long and inclines 64° from the ground. The
ladder to the top is 9 feet long. How steep is the ladder (what angle does the ladder make with the ground)?

  87.0°

Step-by-step explanation:

The law of sines can be used to solve this. We have two sides of a triangle and the angle opposite one of them. We want to find the angle opposite the other known side.

In the attached, the triangle is ΔACS. We have side "a" = 9, and side "c" = 10. Angle A is given as 64°. The law of sines tells us ...

  sin(C)/c = sin(A)/a

  sin(C) = (c/a)sin(A)

  C = arcsin((c/a)sin(A)) = arcsin(10/9·sin(64°)) ≈ 87.03°

The ladder makes an angle of about 87° with the ground.

(x, y)→(x − 8, y − 7)

step-by-step explanation:

enjoy!