exam Maths Puzzle Numerical Ability

How many years will it take for Sheila (34 years old) to be half the age of David (54 years old)?

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exam Other Question

evaluate:
sin(-pie/6)
thanks!
aloha! s=-16t^2 + vt + so

v represents the initial velocity in ft/sec and so represents the initial height in feet.

a) If a rock is thrown upward with an initial velocity of 64 feet