The local zoo is filling two water tanks for the elephant exhibit. one water tank contains 34 gal of water and is filled at a constant rate of 4 gal/h. the second water tank contains 30 gal of water and is filled at a constant rate of 2 gal/h. explain. let x = the number of hours the tanks are filling and let y = the number of gallons in the tank. what are the constraints on the system?

a. both x0, y0
b. x0 only
c. y0 only
d. there are no constraints on the system.

Ascientist studied a population of workers to determine whether verbal praise and/or tangible rewards affect employee productivity. in the study, some workers were offered verbal praise, some were offered tangible rewards (gift cards, presents, and some were offered neither. the productivity of each participant was measured throughout the study by recording the number of daily tasks completed by each employee. which inference might the scientists make based on the given information? a.) the number of daily tasks completed by each employee may influence the dependent variable, which is whether the employee receives verbal praise, tangible rewards, or neither. b.) verbal praise and/or tangible rewards may influence the independent variable, which is the number of daily tasks completed by each employee. c.) verbal praise and/or tangible rewards may influence the dependent variable, which is the number of daily tasks completed by each employee. d.) the dependent variables, which are verbal praise and tangible rewards, may influence the number of daily tasks completed by each employee.