Which equation is false?

A 24 + 4b = 8

B 7 (8) = 56

C 9 (7) = 64

D 4c = 54

C is false. 9 multiplied by 7 equals 63.

I am not sure I understand this question ...

B is true

C is false ... because 9 * 7 = 63

A. 24 + 4b = 8

4b = 8 - 24

4b = - 16

b = - 16/4

b = - 4 ... this is false if b does not equal - 4

D. 4c = 54

c = 54/4

c = 13.5 ... this is false if c does not equal 13.5