Final answer:
To find out how many points Grayson would earn if he played for 30 minutes, we can set up a proportion and solve for 'x'. Applying the cross multiplication method, we find that Grayson would earn 675 points in 30 minutes.
Step-by-step explanation:
In this problem, we are given that Grayson averages 22.5 points in 9 minutes. To find out how many points he would earn if he played for 30 minutes, we can set up a proportion. Let's assume 'x' is the number of points he would earn in 30 minutes.
We can set up the proportion: 9 minutes / 22.5 points = 30 minutes / x points. By cross multiplying, we get 9x = 675. Solving for x, we find that Grayson would earn 675 points in 30 minutes.
Learn more about proportions in mathematics