Answer:
12-2n
Step-by-step explanation:
Difference means to subtract
Times means to multiply
A number would be the variable
Answer:
The discriminant D=0
Step-by-step explanation:
For the duadratic polynomial
the discriminant is

In your case, for the polynomial 
Answer:
x = -6
Step-by-step explanation:
-1.5x = 9 Divide the -1.5 on both sides
x = -6
Plug in the answer to make sure it works.
-1.5(6) = 9
9 = 9
13.45 x $4.30= $57.835 ≈ $57.84
13.45 x 40.2=540.69 miles