Question

Please help fast ill give 10 points along with brainlist answer only if you know!!!

Answer 1

Answer:

C. 780

Step-by-step explanation:

C(n) = 500 + 4n     n = number of students attending = 70

C(70) = 500 + (4*70)

C(70) = 500 + 280

C(70) = 780