Students in a dance class filled out a survey. there were 25 girls and some boys who
participated in the survey. the results showed that 20% of the students prefer tap dance to
ballroom dance. there are 9 students who prefer tap dance. which equation can be used to
find the number of boys ( x) who participated in the survey?
a. 0.2 x + 25 = 9
b. 0.2( x + 25) = 9
c. 0.2(25 – 9) = x
d. 25 + x = 0.2 × 9

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.