Sergio's internet provider charges its customers $9 per month plus 4¢ per minute of on-line usage. sergio received a bill from the provider covering a period and was charged a total of $81.40. how many minutes did he spend on-line during that period? (round to the nearest whole minute, if necessary.)

line or a linear equation graph

step-by-step explanation:

step-by-step explanation:

consider an orange peel: if you want to try and lay it flat, you have to stretch it, we know exactly how things are being stretched or squashed at any given point. we have many different map projections because each has different patterns of some projections can even preserve certain features of the earth without