The answer is B. Hard to explain but it is B.
40 miles an hour and yeah..
Answer:

Step-by-step explanation:
A quadratic equation in one variable given by the general expression:

Where:

The roots of this equation can be found using the quadratic formula, which is given by:

So:

As you can see, in this case:

Using the quadratic formula:

Therefore, the answer is:

The answer is B. 2(4) + 3(24) = 80
1(4) + 4(24) = 100