Sources of income include

a.) salary, interest from bank accounts, and dividends
b.) taxes, interest on savings accounts, and tips
c.) capital gains, ongoing costs, and salary
d.) interest, salary, and taxes

A. Salary, interest from bank accounts, and dividends.

muslims control the north africa during the period of 1500 up

to 1800. they made a barrier to prevent further european exploration from

entering the africa from the north. however, the dutch ware still able to move

toward the interior with having south africa as one of the routes leading to

the east for trading with asia.

you have to put the parentheses like this:

in fact, you have to perform the operation inside parentheses first, and then proceed in order: