Solve the equation
x2 = 80.
X =

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?

Bernice paid $162 in interest on a loan of $1800 borrowed at 6%. how long did it take her to pay the loan off?

Solve the system of equations using the substitution method. {y=−3x+7x=−2y−16 enter your answers in the boxes.