Which of the following math statements contain variable(s)? Check all that apply.
A. 13 - X= 9
IB. 1 + 6 = 7
O C. ? + 7 = 12
D. 15-5=

Chip worked at the animal shelter for 6 hours each week for several weeks. he worked for a total of 42 hours. which of the following can be used to find the number of weeks chip worked at the animal shelter?

Rearrange the formula c^2 = a^2 + b^2 for b

How much dextrose 70% must be mixed with dextrose 5% to prepare 1,000 ml of dextrose 20%?