What equation can be used to find the length of AC?

the first one

Step-by-step explanation:

Using the sine ratio in the right triangle

sin40° = = =

Multiply both sides by 10

10 sin40° = AC ← first equation

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.