Andrew bought a computer for $650, a printer for $135.89, and two printer cartridges for
$28.79 each.
how much did andrew spend in all?

$843.47

Step-by-step explanation:

First off I added 650 to 135.89 to get 785.89. Then I added 57.58 because Andrew bought 2 cartridges. Add 57.58 to 785.89, and you get your answer.  

the entire expression should be subtracted from 30. to subtract the quantity, distribute the negative sign, which changes the signs on the terms. so, the –2 changes to positive and gets added to 30 instead of subtracted from it.

hope this ! ^w^