A pair of sneakers cost $84. You have a coupon for 15% off any purchase. What is the cost of the sneakers? *

A. $12.60
B. $71.40
C. $12.00
D. $72.00

Geometry. i need step by step explanation on how to do each problem.

1. during first 10 seconds 2. between 10 seconds and 35 seconds 3. during 35 seconds to 40 seconds

Players on the school soccer team are selling candles to raise money for an upcoming trip. each player has 24 candles to sell. if a player sells 4 candles a profit of$30 is made. if he sells 12 candles a profit of $70 is made. determine an equation to model his situation?