What is the value of x rounded to the nearest ten, if necessary

Answer:
7.5
Step-by-step explanation:
This is a right triangle so the length of hypotenuse is related to other two sides
x^2 + 4^2 = (8.5)^2
x^2 + 16 = 72.25
x^2 = 72.25 - 16
x^2 = 56.25
x = 7.5