A telephone company charges $0.30 for the first 4 minutes of a call and $0.18 for each additional minute. How long can a person talk for $3

x = total minutes - 4 the 1st 4 minutes are included in the. 30

total cost =.3 +.18 x

3 =.3 +.18 x

subtract. 3 from each side

2.7 =.18x

divide by. 18 on each side

2.7/.18 = x

15 = x

x = total minutes - 4

add 4 to each side

15+4 = total minutes

they can talk 19 minutes