Martha estimated there were 86 marbles in a jar for a contest. the actual number of marbles in the jar was 108. what was the percent error of martha's estimation?

Tim's phone service charges $23.06 plus an additional $0.22 for each text message sent per month. if tim's phone bill was $28.56, which equation could be used to find how many text messages, x, tim sent last month?

Need on this geometry question. explain how you did it.

Write an inequality and solve each problem.for exercises 11 and 12, interpret the solution.