Really need with this question solve with work much appreciated

How do businesses a country's economy? a. by investing in goods and services b. by increasing the unemployment rate c. by making profits

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

Which statement is true about a number and its additive inverse? a. their product is always one. b. their sum is always one. c. they are always reciprocals of each other. d. their sum is always zero.