exam
Maths Puzzle
Numerical Ability
Find the half-life of a radioactive substance that is reduced by 30% in 20 hours
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exam Other Question
x minus the square root of -2x+21 = 9.
What does x equal?
Im not sure how to write the radical sign but -2x+21 is whats under the radical sign.
Evaluate:
(a)
Arcsin (-1/2)
(b)
sin [ Arcsin (-3/5)]