A. Identify the constant in each expression. (1 is done for you) 1.r + 3 ----- constant is 3 2.m-5 3.9x + y 4.8s 5.2πr 6.2 ( 1 x w) B.Identify the variable/s in each expression. (1 is done for you) 1.23 - t ----- the variable is t 2. 15 + z 3.3b 4.2L + 2w 5.3 (e + d) 6.3a + b + c