Alot runs between two parallel streets. the length of the lot on one of the streets is 80-ft. the length of the lot on the other street is 100-ft. the area of the lot is 18,000 square feet. how far apart are the two streets? (the formula for the area of a trapezoid is a=12(b1+b2)h.)

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.