Answer:
C ≥ 9
Step-by-step explanation:
Since they have already spent 15 dollars, and they will spend more than 23, it should at least be 24, but can also be more than 24, so C is greater than or equal to 9 :D
A i think
B= 21
A^2 + B^2 = C^2
72^2 + B^2 = 75^2
Solve for B
B = 21