What is 3 ÷ 2/5??? pls help

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)

Ten times the square of a non-zero number is eqaul to ninety times the number

What will be the end result for the taxpayer who filed his federal income tax return using the 1040ez form shown belowa he'll owe $173b he'll receive a refund of $173c he'll owe $3921d he'll receive a refund of $3921