Answer:
By 30%
Step-by-step explanation
He has improved by 6 free throws. He used to score 20 points from free throws(Im assuming this is basketball) He scores 6 more in three weeks.
6/20 = 30/100=30 percent.
Check:
30% of 20 = 6
6=6
You must factor.

The factored form is equal to the assigned form.

Values a, b correspond to the factored 1, -1.
Value of x however remains unknown. But we can change that.
Given factored result,

We can set expression equal to 0 then find such x that when added with number a or b results with 0.

Hence x has 2 solutions.

Hope this helps.
Cameron does beat his best score. He scores 7 and 8 over par, as well as 3 under par twice. This makes him have 7 + 8 or 15 over par and 3 + 3 or 6 under par. 15 - 6 = 9, which is under 13, his current best score.
Well I don't know if i'm answering the question, but 30 workers surveyed were satisfied with the benefits they received from the employers because 300 multiplied by .10 is 30. Hope my answer is useful.