A circular running track is 1/4 mile long. Elena runs on this track, completing each lap in 1/20 of an hour. What is Elena's running speed?

Kayla made observations about the sellin price of a new brand of coffee that sold in the three different sized bags she recorded those observations in the following table 6 is $2.10 8 is $2.80 and 16 is to $5.60 use the relationship to predict the cost of a 20oz bag of coffee.

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9

Idon't get undoing if its pass adding and subtracting so can someone ? x-2 over 5 = 18