The largest source of household income in the u. s. is obtained from
a. stock dividends
b. wages and salaries
c. interest earnings
d. rental income

B. wages and salaries 

Gross income minus any adjustments, deductions, and exemptions is called net income. Solving the net income is pretty easy. Net income is the amount of money you will get or you will see in your paycheck. When you start working, you can relate much on this one. Some or most companies will issue pay slips to employees as reference to their earnings for a specific period of time. When you see the word net income in your pay slip, then you know how much money you will get. 

Idk for this one pal