The cost of a long distance telephone call is given by the function c(m) =0.1m+1.1,where m the length of the call in minutes. determine how long a phone call can be made for $6.10

50 minutes

Step-by-step explanation:

C(m) =0.1m+1.1 = 6.10   ... - 1.1 both sides

0.1 m = 5.0

m = 50

cheater

step-by-step explanation:

we have three similar triangles, because each has a right angle and shares an angle.   let's write the angles in order: opposite to short leg, long leg, hypotenuse.

cab similar to bad similar to cbd

or as ratios,

ca: ab: cb = ba: ad: bd = cb: bd: cd

we also know

ac = ad + cd

(ad+cd): ab: cb = ba: ad: bd = cb: bd: cd

(ad+cd)/cb=cb/cd

we have cb=6, ad=5 and seek x=cd.

we reject the negative root and conclude x=4

answer: 4