exam Maths Puzzle Numerical Ability

Thank you in advance for helping me with this equation. sqrt(-2x-7) + sqrt(x+9)= sqrt(8-x)

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exam Other Question

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? Write equations for the vertical and the horizontal lines passing through the point (2,7) in (x,y) -coordinates.