book Maths Puzzle Numerical Ability

Graph the function f(x)= x+1 if the domain is only negative integers?

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book Other Question

(-3xy^-9)^-2/(xy^-7)^-2

Simplify the expression using positive exponents only.
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