Per month means multiply
Total means the amount your ending with but for this you could say add
Final answer f = 4.75 + 10m
The answer would be 1. The commutative postulate for multiplication. Hope this helped! Good luck! :)
The price of the discount is $25 x 0.15 = $3.75
The price of the book with discount is $25 - $3.75 = $21.25
1m is equal to 100cm, so the scale reduces the size of the actual object