exam Maths Puzzle Numerical Ability

I need help to perform the given operation

f(x)=2x2-13x+15, g(x)=3x+4

I need to find (f+g)(-1)

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exam Other Question

How do you find the domain of this function algebraically??

y= square root x / x-1 A certain sum of money is invested at 10%. Twice that amount is invested at 8%. The total amount of interest from both investments is $91.00. How much is invested at 8%. Can you show me how you work it out and solve it?