What is x in the simplest radical form? x^2+7^2=24^2

Given a circle with measures of (c, d, and r) and a circle with measures of (c', d', and r'), what is d if c c' = 12 and d' = 0.50? a) 3 b) 6 c) 12 d) 24

If eh = hg and hg=16, find the diameter of k

Which one ? is the answer and how to find this answer