What I would do is start with the price of the dessert and the sales tax $3.85+ $1.15= $5. I started with this because when you add the cents they equal a dollar which makes it easier to continue.
Then I would add the 2.75. This would be 7.75.
Then add 7.75 + 8.50. To simplify this, you can add 7 + 8, then .75+ .50
Which would equal 15 + 1.25 + 16.25
4n-7=-3n
add 3n to both sides
and then solve for n
n=1
DC= 4
BD= 10
Hope it’s right
Best luck with your studying
