Ronald is traveling by bus from his home to his college. He has gone 7.5 miles so

y = 50mph*x + 7.5mi

Step-by-step explanation:

This can be modeled with a linear equation:

y = a*x + b

Where y is the distance traveled

x is hours

a is the distance that he moves in one hour

b is the initial distance moved.

We know that he has gone 7.5 miles so far, so b = 7.5mi

we know that from this point, he can cover 50 miles per hour, so a = 50mph

Then the equation is:

y = 50mph*x + 7.5mi

2/8

Step-by-step explanation:

There are 2 green marbles.

In all, there are 8 marbles.

So, the probability is 2/8.