You're correct with the answer you have selected. It's 7.2 x 10^7
Answer:
x = 2
or 14.8
Step-by-step explanation:
First find the missing leg of the right triangle.
8²-3²=x²
x = 
then double is to get x in the drawing
x = 2
or 14.8
You would put a Vinculum on top of it