Ariel travels 400 miles in 8 hours. what is her rate of change or speed? a) 40 miles per hour b) 50 miles per hour c) 55 miles per hour d) 60 miles per hour

b

Step-by-step explanation:

 The correct option is

(B) 50 miles per hour.

Step-by-step explanation:  Given that Ariel travels 400 miles in 8 hours.

We are to find her rate of change or speed.

We know that

the relation between distance (D), time (T) and speed (S) is as follows :

In the given situation, we have

distance, D = 400 miles and time, T = 8 hours.

Therefore, the speed is given by

Thus, the required speed is 50 miles per hours.

Option (B) is CORRECT.

d. g(x) = 5f(x)

When a function is stretched vertically, every function value is multiplied by the stretch factor. Here that factor is 5. Multiplying f(x) by 5 gives ...

... g(x) = 5f(x)