Answer:
B
Step-by-step explanation:
Using the Pascal's triangle
Pertaining to the 8th term the coefficients are;
1, 8, 28, 56, 70, 56,28, 8 and 1 in that order
Expanding this,
the coefficient of the term x^7y is 8
A = 20
12/3 = A/5
60 = 3A
A = 60÷3 = 20
And?
1. x = 3
2.x = 6
3. x = 5
I hope this helps you :D
