The cost in dollars of a Valentine's Dance is 45 + 3s where s is the number of students attending. What is the cost for 78 students

Step-by-step explanation:

The cost for 78 students is $279.

If s is the number of students and you have 78 students attending, do 3*78 first. You should get 234, then once you get that total, don't forget to add 45 dollars onto it.

The cost would be $279