At dorothy's hair salon, 4 gallons of shampoo will last 3 weeks. she has 7 gallons of shampoo. how much more must she order if she wants to have enough for 12 weeks? i will give brainliest

9 gallons

Step-by-step explanation:

We can see that the quantity of shampoo and the number of weeks a re directly proportional.

We know that if two quantities x and y are directly proportional , then we have the following equation :-

Let x be the total quantity of shampoo need for 12 weeks , then we have

If she  has 7 gallons of shampoo, then the required quantity of shampoo for 12 weeks =

Hence, she must order 9 gallons of shampoo if she wants to have enough for 12 weeks.

15%

step-by-step explanation:

use the table and count the number of guesses that has two correct answers.

the following are two correct answers

10010, 01100, 11000

a total of 3 numbers having 2 correct guesses out of 20 questions.

probability of getting 2 correct guesses = the number of questions getting 2 correct answers / total number of questions.

= 3/20

to convert it into percent multiply by 100, we get

= 3/20 * 100

= 15%

the answer is 15%

you.

14

step-by-step explanation: