Haley would like to make a 5-pound coffee mixture that is 60% sumatra coffee bean blend. she has several pounds of a mixture that is 20% sumatra beans and another mixture blend with 80% sumatra beans. let x represent the amount of the 20% blend and y represent the amount of the 80% blend to find out how many pounds of each mixture hailey will need. what is the system that models this situation? what is the solution to the system: show your work.

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.