Respuesta :

a^2 + b^2 = c^2 in right triangles.
4^2 + b^2 = 8.5^2
16 + b^2 = 72.25
b^2 = 56.25
b = 7.5
The answer to #4 is A)7.5 m 
The answer to #5 is C)28.3 cm