3. In the equation 48 + r = 15. Which is a variable?
Ar
B. 48
C. 15
D. 48 +
4. Which of the following equation has a constant value?
A. xyz = a
B. 2m = 2m
C. 75 - 18 = f
D. 52n + 5n + 15n = 72n​