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 * 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)