a 3.75-gram sample of limestone, caco3, contains 1.50 g of calcium and 0.450 g of carbon. what is the percent oxygen in limestone?

Sat no calculator section question in the picture

Jim has found that he must consume 2,300 calories a day to reach his health goals, but he doesn't want to give up his afternoon snack of pretzels. unfortunately, he tends to eat the entire bag — which amounts to 1,300 calories! what strategy should jim use to improve his habits?

Whats begin with t, ends with t has t in it