4) A business is modeling the sales for one of its products for the month. The total income for sales for the month is modeled by 20x + 40 (in dollars). a) If they sold 20 items this month, what is an expression for the price of each item?

b) If the actual price of each item is $15, what is the value of x?

please so work!! :)

Trish receives $450 on the first of each month. josh receives $450 on the last day of each month. both trish and josh will receive payments for next four years. at a discount rate of 9.5 percent, what is the difference in the present value of these two sets of payments?

Find the axis of symmerty for x y=x squared -4x-8

15. jiovanni is looking in to two different companies that offer study guides for math exams.test prep 101 charges a $5 flat fee and an additional $0.25 per problem.math charges a $2 flat fee and an additional $0.50 per problem.how many prablems would make the costs of the two companies be equal? varibles: equations/eniqualities{ {