Select all expressions that are rational. Simplify -101--154 Select one or more: ma. 54y Select one B +VM 15 b. 6 -m a. 23-3 and x + -3/2 /1/3/2 2 b. and x # 3/2/0,3/2 20-3 3- 5 3-c C. 2 7 3 and x - -3/21.3/2 " d 45 27-3 and x # 3/2 0. 3/2 41 Liquid chlorine is added to a swimming pool to sanitize the water. At t hours, the concentration of chlorine in the pool can be expressed as 4+21 mg/L Determine the concentration of chlorine in the pool at 2h. Select one: Ofa. 4 mg/L O b. 1 mg/L O c. 0 mg/L O d. 2 mg/L