4.scientists use many mathematical equations to make sure that the space shuttle keeps to its intended trajectory and does not get lost in the universe a) path b)speed c) velocity d)weight 5. choose the answer that best matches the word in italics. eckels was not killed for being craven but because of his impact on the world as a whole. a) cowardly b) rebellious c) short-sighted d) vindictive 6. choose the awnser that best matches the word in italics. sometimes when valerie awnsers so shortly, she is perceived as abrasive. a) arrogant b) harsh c) intelligent d) not listening 7-18