the answer you have selected is correct
The equation is a third-degree polynomial. The only way to know its trend is to graph it. 'F(x)' means a function of x. This could be any variable (suppose it's y). Assign values for x, you get their corresponding values of y, then plot x against y. The graph is shown in the picture. As you can observe, the answer should be letter D.
9514 1404 393
Answer:
5 seconds
Step-by-step explanation:
Suppose the front parts of the trains meet at point A. Since both are the same length and traveling the same speed, each will pass point A in time ...
time = distance/speed
time = (1/18 mi)/(40 mi/h) = (1/720 h) × (3600 s)/(1 h) = 5 s
That is, the rear part of each train will be at point A 5 seconds after the front part.
The rear parts will pass each other 5 seconds after the front parts meet.
You would mark it halfway between 1 and 2 because 3/2 is 1.5
A^2 + b^2 = c^2
9^2 + 12^2 = c^2
81 + 144 = c^2
225 = c^2
sqrt 225 = c
15 = c <=== Jack is 15 miles from the cave