American airlines spent over 6,651,297,000 on the direct maintenance of its planes. how would this number be written in verbal form? what would the cost of maintenance be if it were rounded all the way? if american rounded its maintenance cost to the nearest hundred million, what would it be?

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.