A store owner spends 7x + $13 on two order of boxes of light bulbs including shipping if she spends 3x + $5 on the first order of lightbulbs how much does she spend the second order

4x + $8

Step-by-step explanation:

You know that ...

cost of both orders = cost of first order + cost of second order

Subtracting the cost of the first order gives ...

cost of both orders - cost of first order = cost of second order

(7x + $13) - (3x + $5) = cost of second order

(7x - 3x) + ($13 - $5) = cost of second order

4x + $8 = cost of second order