exam Maths Puzzle Numerical Ability

This is a critical thinking exercise, that may or may not require algebra.
A Wagon Wheel is placed against a wall.One point on the edge of the wheel is 5 inches from the ground and 10 inches from the wall. What is the radius of the wheel?

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exam Other Question
Simplify:

(a^1/2 / b^2)^2 * (b^3/2 / a^2/3)^3 Which of the following is a growth curve?
a)y=0.6^x
b)y=(2/3)^-x
c)y=3.5^-x
d)y=2(1/3)^x
I think the answer is (d). Can someone please confirm???