Respuesta :

Hello There!

Write out the formula again:
b = 4c - s².
Substitute your numbers in:
b = 4(25) - (9)²
Simplify:
4 x 25 = 100
9² = 81
b = 100 - 81
Solve:
100 - 81 = 19
b = 19.

Hope This Helps You!
Good Luck :) 

- Hannah ❤