10 points
The cost for an eighth-grade party is $450 for room rental, entertainment, and decorations, plus $20 per person for food. Tickets for the party are sold for $25. What is the break-even point?

A.18 tickets

B.23 tickets

C.45 tickets

D.90 tickets

9514 1404 393

  D.  90 tickets

Step-by-step explanation:

For t tickets sold, we want the revenue equal to the cost.

  25t = 450 +20t

  5t = 450 . . . subtract 20t

  t = 90 . . . . . divide by 5

90 tickets is the break-even point.

exa:

)

3+11

14

step-by-step explanation:

from this example, we can see that subtracting with integers is the same as adding the opposite. we can solve using a number line or by using the saying "keep, change, change" to us solve. it is important to remember that we can subtract a negative and end up with a larger number than we started with.

so, converting firstly the mixed fractions to improper fractions and then "adding".