X^4yz^2+5xyz^3+y^4+2

Please help

Hiroki wrote a number that is the opposite of -3. what number did hiroki write? a. ⅓ b. 3 c. 0 d. -3

What are the domain and range of f(x)=[1/5]x

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