The usual toll charge to use the bingham tunnel is 50 cents. if you pur-

chase a special sticker for $5.50, the toll is only 35 cents. at least how

many trips through the tunnel are needed before the sticker costs less than

paying for each trip separately?

At least 37.

Step-by-step explanation:

First, write an equation for the problem.

5.50+0.35x<0.50x

Where X is the number of trips through the tunnel.

Then, solve.

550+35x < 50x         Multiply all terms by 100

550 < 15x                  Subtract 35x from both sides

36 2/3 < x                  Divide both sides by 15.

Therefore, the number of trips through the tunnel must be greater than 36 to have having the sticker cost less than paying for each trip separately.

5x+40

5(x + 8)

7x - 49

7(x - 7)

18x + 9

9(2x + 1)

15x - 10

5(3x - 2)

step-by-step explanation:

for number one all you have to do is factor 5 out of 5x + 40

for number 2 factor 7 out of 7x - 49

for number three factor 9 out of 18x + 9

for number four factor 5 out of 15x - 10