Answer:
9
Step-by-step explanation:
x2+3x+3x+9=12
(x+3)(x+3)=12
x+3=12
x=9
Average =hits/bats
0.320=24/b
0.320(b)=24/b×b
0.320b=24
B=24/0.320
B= 75
At bat is 75
LHS ≠ RHS