Sillybasangid Sillybasangid Math Answered 3. In the equation 48 + r = 15. Which is a variable?ArB. 48C. 15D. 48 +4. Which of the following equation has a constant value?A. xyz = aB. 2m = 2mC. 75 - 18 = fD. 52n + 5n + 15n = 72n