Answer:
If 5 light bulbs cost $9, then each costs $1.8.
Then 7 light bulbs would cost $12.6.
Step-by-step explanation:
Answer:
If 5 light bulbs costs $9
1 lights bulb‘s cost is 9 divided by 5.
9 divided by 5 is equal to $1.8
1.8 x 7 = $12.6
answer is 12.6