Answer:
Step-by-step explanation:
we have
we know that
substitute
-9
5-p
p=-9
-4 is greater than 5-p
Use the equation
89 < 75 + 0.7*M Subtract 75 from both sides
89 - 75 < 0.7M Combine
14 < 0.7 M Divide both sides by 0.7
14/0.7 < M
20 < M
If M goes over 20 then the flat rate is cheaper.
580