exam Maths Puzzle Numerical Ability

Multiply.

(x/3 + 3/4)(3x/4 - 3/5)

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Avaition:

A helicopter, flying directly over a fishing boat at an altitude of 1200 ft., spots an ocean liner at a 15 degree angle of depression. How far from the boat is the lin I do not understand how to do these problems. Please help
2-48 even
Thanks Saqorea