Charles is starting a lawn care business. He has expenses of $260 for the lawn mower and an additional $5 of gas per lawn that he mows. His revenue is $30 per lawn. Write a system of equations to model this business and use it to determine how many lawns Charles has to mow before he starts to make a profit.

Jessa bought a yoyo from a company that claims that, with each retraction, the string rolls up by 60% of the original length. she sets up a tape measure and throws the yoyo 3 times. her data are charted below. throw length of string (feet) 1 3 2 1.8 3 1.08 jessa wants to find the sum of the length of string after 10 throws. what is the sum of the lengths, rounded to the nearest hundredth?