Julie is packing marbles into boxes. She needs to pack away 815 marbles. She has boxes that can hold 10, 25, 50, or 100 marbles. If Julie can use at most 5 boxes of each size to fill each box she uses, what is the minimum amount of boxes she need to pack all her marbles?

What is (28 + 7 + 6 + 3) x 1/2 show your work

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

Me with this assignment ! i only partially understand, so explain. also it's a work sample. at the championship bike race, steve and paula were fighting for first place. steve was 175 feet ahead of paula and had only 300 feet left to go. he was very tired and was going only 9 feet per second. paula was desperate to catch up and was going 15 feet per second. who won the bike race and by how far did she/he win?