exam Maths Puzzle Numerical Ability

A field Microphone has a parabolic cross section and is 18 inches deep. The focus is 4 inches from the vertex. Find the width of the microphone.

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please help me to solve this equation? 7^77-77^67? Grandpa started to give nickels to his grandchildren any time he sa them. So far, Sharon has 3 times as many as Jennifer, Sharon has twice as many as Brian, and Michelle has only