Inequalities

Question

a cell phone company has offered you two different rates. The first rate is $35 per month and 5 cents per phone call (time does not matter). The second offer is $55 per month and 2 cents per call. Set up the inequality to model this problem and find where it is less expensive to go with the second plan.

Answer 1

35 + .05c = A

55 + .02c = B

Let's try gussing 700 calls. Plug 700 in for c

35 + .05*700 = A

A = 35 + 35

A = 70

B = 55 + .02*700

B= 55 + 14

B= 69

To write the inequality we would say:

B > A when C>700

Answer 2

-13 + 5 X -5 > -13 + 10 X -5