exam Maths Puzzle Numerical Ability

Triangle ABC is a right triangle. If side AC=5 and side BC=6, What is the measure of side AB?

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exam Other Question

Carl and Fred started driving from the same point, Carl driving due east and Fred traveling due west. The rate at which Carl drove was twice that of Fred. After four hours, they were 600 miles apart. Find the rate of each. A rectangular box is(3x+7) feet wide, (6x + 3) feet long, and (7x-1)feet high.
Find the volume of this box./
Please help me with this one,I tried to do it.
V=LWH

V=(6x+3)(3x+7)(7x-1)
126x-21
Thank you