A rock is dropped from the top of a 2000-foot building. After 1 second, the rock is traveling 32 feet per second. After 2 seconds, the rock is traveling 64 feet per second. Let y be the rate of descent and x be the number of seconds since the rock was dropped
a. Write a linear equation that relates time x to rate y [Hint Use the ordered pairs (1,32) and (2,64)]
b. Use this equation to determine the rate of travel of the rock 19 seconds after it was dropped.
a. The linear equation that relates time x to rate y isy
b. After 19 seconds, the rock travels at the rate of

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.