You start driving north for 21 miles, turn right, and drive east for another 20 miles.

How many miles must you travel to return directly back to your starting point?

Ateacher has $80 to buy workbooks. each work book cost $3. if she buys as many workbooks as possible, how much money does she have leftover? a) $2 b) $4 c) $6 d) $8

Tim's phone service charges $26.39 plus an additional $0.21 for each text message sent per month. if tim's phone bill was $31.64, which equation could be used to find how many text messages, x, tim sent last month?

Which value of m will create a system of parallel lines with no solution? y = mx - 6 8x - 4y = 12