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

Are the following lines parellel, perpendicular, or neither?

L1 through (-4, -7) and (1, 3)
L2 through (2, 6) and (4, 10) An oil tank was 1/10 full then 280 gallons was delivered which made it 8/10 full. If x= the capacity of the oil tank, what equation can be used to find the capacity of the tank?