# Your local gas stations are having a price war. During the past 7 days they have lowered the price of regular gas by $.02 each day How do you write and solve an equation to find the total change in gas price? ##### 1 Answer Jul 31, 2017 See a solution process below: #### Explanation: Let's let: $t$be the total change in the price of gas, what we are solving for in this problem. $d$be the number of days the prices has decreased. 7 for this problem. $c$be the change in price each day. -$0.02 for this problem (the price has been lowered so this number is negative).

The formula will be:

$t = d \cdot c$

Substituting and calculating $t$ gives:

t = 7 * -$0.02$

t = -$0.14$

Over the last 7 days the price of gas has changed color(red)(-\$0.14)#