Which ratio is equivalent to 4 : 13?
a. 8 : 17
b.16 : 52
c. 12 : 33
d. 20 : 55

Fanny mendelssohn manages all the magazines and paperback books at a local grocery store. she prices many paperbacks to sell at $7.99. the cost to the store is $5.29. what is the markup rate on a paperback book, based on its cost?

If $740 is invested at an interest rate of 11% per year and is compounded continuously, how much will the investment be worth in 7 years? use the continuous compound interest formula a = pert.

Using elimination, what is -4x+2y=-12 4x+8y=-24