Sam is trying to determine which cell phone and service plan to buy for his mother. The first phone costs $100 and $55 per month
for unlimited usage. The second iphone costs $150 and $51 per month for unlimited usage. How many months will it take for the second phone to be less expensive than the first phone?
Since m is the midpoint of ab, then the following relationship is fulfilled: Therefore, substituting values we have: From here, we clear the value of x. We have then: Then, the value of am, is given by substituting x in the expression: Substituting we have: Answer: the length of am is: