What is (f+g)(x)?

f(x)= x^3 − x

g(x)= x^3 + 2x^2 − 10

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(f+g)(x)=

Show algebraically that f and g are inverse functions f(x)=x^2/-6; g(x)=square root of 2x+12

Oscar and julie ashton are celebrating their 15th anniversary by having a reception hall. they have budgeted $4,500 for their reception. if the reception hall charges a $90 cleanup fee plus & 36 per person, find the greatest number of people that they may invite and still stay within their budget.

Me i’m stuck on all these questions besides the two bottom ones