exam Maths Puzzle Numerical Ability

Note: This is from a worksheet not a textbook.
v2=42.2m/s
t=47.3s
a=1.34m/s2
v1=:?
You are supposed to use the acceleration formula on this [I AM PRETTY SURE]
It is a=v2-v1/t

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exam Other Question

Simplify:


((x^(3/2))y^-3)^1/3
--------------------
((x^(1/2))y^-6)^-1

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Solve: The half-life of a substance is the time that it takes for half of the substance to remain after natural decay. If Uranium-238 has a half-life of 4.15 billion years, how long does it take for 90% of the substance to decay?