Your puppy weighed 2 1/2 lb last week. this week it weighs 7 1/4lb. how much weight has the puppy gained? a) 9 3/4 b) 3/4 c) 4 3/4 d) 7 1/2

51

step-by-step explanation:

73-22=51 the   mass number minus the amount of protons gives you the amount of neutrons

step-by-step explanation:

no, her answer is not correct.   we square the lengths of all sides and then determine whether the pythagorean theorem holds here:

9² + 15² = 306.   this is not equal to the square of the longest side ( that square being 395.   answer c is correct.