8.9% is equivalent to what fraction in reduced terms?

For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')

Solve this riddle: i am an odd number. i an less than 100. the some of my digit is 12. i am a multiple of 15. what number am i?

Acertain volume of water contains 100000 hydrogen atoms and 50,000 oxygen atoms how many hydrogen atoms are in a volume of water containing 4 million oxygen atoms