Can someone HELP me please

I'm gonna give the steps. you can calculate

Step-by-step explanation:

a squared + b squared = c squared

15 squared + b squared = 17 squared

then find the value of b squared

225 + b squared = 289

subtract 225 on both sides

b squared = 64

b = 8

I'm not very sure but I hope you get the idea

problem:

f(x) = - 2/3x + 5; f(5/2)

substitute 5/2 in for x:

f(5/2) = -2/3(5/2) + 5

simplify the right side:

f(5/2) = -5/3 + 5

f(5/2) = 10/3

f(5/2) = 10/3

i hope this !