College business math

where x is the number of units sold, what is the average rate of change in revenue R(x) as x increases from 14 to 28 units? $ per unit

You would like to have $750,000 when you retire in 25 years. How much should you invest each quarter if you can earn a rate of 4.2% compounded quarterly?a) How much should you deposit each... more

Need help solving this problem.

A retired couple receives $ 14,000 per year from Social Security and an additional $ 18,000 in interest from retirement plans and lifetime savings. They need all of their income to pay expenses... more

a worker get a 4.5% increase in raise from his current salary of 40,167. How much will the raise be?

a blanket costs $70 but is being sold for $90.what is the dollar markup.

Profits on Nissan Altima and Sentra average $1200 and $850 respectively at one dealership. The total profits in a month in which they sold 120 of these models was $130350. Find the number of each... more

F (x)=x2-8x+69