exam Maths Puzzle Numerical Ability

Please help if you can.

Find the Half-Life or Doubling Time for the following:

Q=1000e^0.5t

I have no idea where to go with this one. Thank you for any help you can offer.

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exam Other Question
a.56 houses available use x for #1 and y for #2write an equation that illistrates the situation. x + y = 56 ?
b.the salesman says there are 3 times as many homes available with p Solve each of the following systems by addition. If a unique solution does not exist, state whether the system is inconsistent or dependent.
x+5y=10
-2x-10y=-20