Can anyone help me fast?

b = 8

Step-by-step explanation:

c^2 = a^2 + b^2

17^2 = 15^2 + b^2

289 = 225 + b^2

b^2 = 289 - 225

b^2 = 64

b = 8

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.