If you guess incorrectly on a question, you immediately lose the points you "wagered" when setting your confidence level. If you answer the question correctly after that initial incorrect guess, however, you can earn back half of those points in most cases. So, here’s a math question for you: Suppose you set your confidence level at "I think I know it," which means that you’re initially risking 80 points. You guess wrong on the first attempt. How many "second-chance" points will you be able to earn back?

40 points

Step-by-step explanation:

Step 1: Since you every incorrect guess costs you the points you wagered,and   a set confidence level of "I think I know it" i worth *80 points, you will lose this 80 points after an incorrect guess.

Step 2: Since if I guess right on the second chance, I earn half of the points I  lost, I will earn back 80/2 points = 40 points

walter needs to make at least 5 more cookies but no more than 40. 5 ≤ x ≤ 40

step-by-step explanation:

20 ≤ x + 15 ≤ 55

subtract 15 from all parts

20-15 ≤ x + 15-15 ≤ 55-15

5 ≤ x ≤ 40

this means how many more cookies he has to make

walter needs to make at least 5 more cookies, but no more than 40 cookies; 5 ≤ x ≤ 40