exam Maths Puzzle Numerical Ability

please help me with the answers to these two questions.they are algebra question from my school.please show it was done,thank you.college algebra(blitzer)

1- the volume of a cub

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Would you please answer 2(a-8)+7=5(a+2)-3a-19 please give the steps, thanks! 5) Logarithms:

a)Using a calculator, find log 1000 where log means log to the base of 10.
Answer:

b) Most calculators have 2 different logs on them: log, which is base 10