The relationship between hours spent studying and the average grade on an algebra exam was found to be a linear function. The average grade for students who spend 1 hour studying was 76, and it was 88 for students who spend 3 hours of studying.
a. What was the average grade for students who spent 4 hours of studying?
b. How many hours of studying would have resulted in an average grade of 80?

Astudent is determining the influence of different types of food on the growth rate of spiders. she feeds one group of spiders two caterpillars twice a week. the other group received similarly-sized beetles twice a week. she records the amount of time required for individuals to reach sexual maturity. her hypothesis is that the spiders feeding on caterpillars will have a faster growth rate because caterpillars have a higher protein content compared to beetles. in this experiment, what is the dependent variable? spiders assigned to different feeding groups. time required to reach sexual maturity number of prey items fed twice a week. growth rates of each group.