Respuesta :
This is the answer, hope u do well in your exam!! You could use mathaway to help you solve what u don’t know.

B = 1/4K(c+d)
4b = k(c+d)
4b/k = c+d
4b/k - d = c
Answer: c = 4b/k - d
4b = k(c+d)
4b/k = c+d
4b/k - d = c
Answer: c = 4b/k - d