exam Maths Puzzle Numerical Ability

A projectile is thrown upward at the rate of 42 feet per second from a platform 150 feet high.

How long does it take to hit ground?

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exam Other Question

The perimeter of a rectangular garden is 200 yards. The length is eight yards more than three times the width. Find the lenght of the garden. Thank you in advance for helping me with this equation. sqrt(-2x-7) + sqrt(x+9)= sqrt(8-x)