Erica knits 19 squares on Monday. Starting on Tuesday, she knits 4 squares each day. How many squares does Erica knit by the end of the day on Friday?
Erica knits
squares by the end of the day on Friday.

Aboat has a speed of 9 mph in calm water. it takes the boat 4 hours to travel upstream but only 2 hours to travel the same distance downstream. which equation can be used to find c, the speed of the current? 2(9 – c) = 4(9 + c) 9 + c = 4(9 – c) 9 – c = 2(9 + c) 4(9 – c) = 2(9 + c)