Why does "prove" have one O?

It rhymes with groove. Oo had the same sound as moose.




Then again, move has one O and it has an Oo sound. Then why those 2 words with one O that makes an Oo sound?



ah.

Changing

Least amount of coins that totals from $.01 - .99: 10

4 pennies
3 quarters
2 dimes
1 nickel