A cellular phone service provider charges $45 per month and $0.08 per minute of airtime. Enter the linear model that represents the monthly charge, c, as a function of t, the airtime used, in minutes.

Which graph represents the equation y =4x

Aculture started with 4,000 bacteria. after 5 hours, it grew to 5,200 bacteria. predict how many bacteria will be present after 19 hours. round your answer to the nearest whole number.

6. sarah saved $12.75 every week for a number of weeks, w. she received an additional $25 during the last week in which she saved money. write and solve an equation to find the number of weeks, w, for which sarah had saved money if she has $114.25 now.