Question

Please help me I dont understand

Answer 1

Explanation:

The total charge ("total" is a clue word!) is the standard charge plus the insurance charge.

`C=S+I\\C=(0.4M+17.75)+(0.15M+4.90)\\C=0.55M+22.65`

That last step comes from combining like terms (put the M's together and the "just numbers" together).