book Maths Puzzle Numerical Ability

if n=2, what does (5-n)^3 equal?

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book Other Question

The amount A in an account after t years of an initial principle P
invested at an annual rate r compounded continuously is given by A
= Pe^rt where r is expressed as a decimal. W
rewrite the equation so that y is a function of x solve for y

7x+y=13