Answer: if solving for x....
x= 6
Step-by-step explanation:
2x-5=7
2x-5+5=7+5
2x-5+5=7+5
2x/2= 12/2
x= 6
With what cause I got you
Your answer is B. 12.
12 kids are unaccounted for after you subtract the kids that take A1, then A2, the both subjects.
Recall that the discriminant is b² - 4ac
So, substitute, b = 4, a = -1 and c = -2
Δ = 16 - 4(-1)(-2) = 16 - 8 = 8