Answer:
21.10 minutes
Step-by-step explanation:
6.75+7.1+7.25=21.10
a = -2
b = 7
5a+3b=11
-2a+3=b
substitute for b:
5a + 3(-2a + 3) = 11
5a -6a + 9 = 11
-a = 2
The answer is 24.
An.swer:
171.68
5