Of 20 test scores, five are less than or equal to 82. What is the percentile rank of a test score of 82?

Set up a ratio of number of scores less than or equal to 82 over the total scores compared tot he percentile:

5/20 = P/100

Cross multiply:

20P = 500

Divide both sides by 20:

P = 25

Percentile rank is 25

Number of people who will be having flu in 4 days will be 32.

Step-by-step explanation:

Swine flu is attacking Porkopolis. The function that represents the number of people who have swine flu in t number of days will be

S(t) = 9t - 4

We have to calculate the number of people who suffered from flu in 4 days.

By substituting t = 4

S(4) = 9×4 - 4

      = 36 - 4

      = 32

Therefore, number of people who will be having flu in 4 days will be 32.