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?

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Answer 1 · 2017-07-31T16:57:49

See a solution process below:

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 * 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)#