Answer:
-4p=13
Step-by-step explanation:
-3p-7p=13
p=-13/4
x 1/2 -1
3 different ways
100 - 99.79 = 0.21
.21 = 2 dimes and 1 penny
.21 = 4 nickels and 1 penny
.21 = 1 dimes, 2 nickels and 1 penny