SOLUTION: A cell phone Co. offers a contract for which the cost C, in dollars,of t minutes of telephoning is given by C=0.25(t-600)+57.95, it is assumed that t is = to or

SOLUTION: A cell phone Co. offers a contract for which the cost C, in dollars,of t minutes of telephoning is given by C=0.25(t-600)+57.95, it is assumed that t is = to or > 600 minutes. W

Question 198351: A cell phone Co. offers a contract for which the cost C, in dollars,of t minutes of telephoning is given by C=0.25(t-600)+57.95, it is assumed that t is = to or > 600 minutes. What times will keep cost between $96.70 and $141.20?
My answer:
C=0.25(t-600)+57.95
substitute
96.70=0.25(t-600)+57.95
96.70=0.25t-150+57.95
=188.75=.25t
t=755

C=0.25(t-600)+57.95
141.20=.25t-150+57.95
=233.25=.25t
t=933
Answer by arallie(162) (Show Source): You can put this solution on YOUR website!
You did it perfectly.
RELATED QUESTIONS
Man this one is a doozy it says, a cell phone company offers a contract for which the... (answered by richwmiller)

a cellular phone company offers a contract for which the cost of C, in dollars, of t... (answered by Fombitz)

A cellular phone company offers a contract for which the cost C, in dollars, of t minutes (answered by Sarpi)

A cellular phone company offers a contract for which the cost , C, in dollars, of t... (answered by ankor@dixie-net.com)

A cellular phone company offers a contract for which the cost C, in dollars, of t minutes (answered by richwmiller)

Inequality Problem: A cell phone company offers a contract for which the cost (C), in... (answered by stanbon)

A cellular phone compnay offers a contract for which the cost C, in dollars, of t minutes (answered by stanbon)

A cellular phone company offers a contract for which the cost C, in dollars, of t minutes (answered by Theo)

A cellular phone company offers a contract for which the cost C; in dollars of t minutes... (answered by Fombitz)