Aside of a regular pentatgon is 20 inches in length. find the length of the apothem of the pentagon to the nearest tenthg of an inch.

Solve 2x+y=3 x+y=5 in substitution method

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?

Sally deposited money into a savings account paying 4% simple interest per year.the first year,she earned $75 in interest.how much interest will she earn during the following year?