exam Maths Puzzle Numerical Ability

Please Help! A plumber charges a fee of $75 per service call plus $15 per hour.If h is the number of hours the plumber works, then write the expression to the total charges(c).

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exam Other Question

add and express in simplest form

2/s + 9/s^2

I think it may be 11/s but am not sure and need help.

Thanks
What is the simplest form of (3^n)(9(^n-2))(sqrt4(^4n+2)/4(^2n+1) Note: the 4(^2n+1)is the denominator for all.