Why we did not delete x+4 with x+4 here?

Because the numerator being zero makes f(x)=0, and zero is a value.

Step-by-step explanation:

The domain of any rational function will be determinated by all values that DO NOT satisfy the denominator, meaning, makes it zero.

When solving the given denominator, they find that -4 and 9 are the values that makes the function equal to zero, which is mathematically incorrect.

Hope this clear your doubts.

b

step-by-step explanation:

the total is 23.97. 0.25% is off so you have to subtracting 25% from 100% and you will get 75% if you convert it to decimal you will get 0.75. you have to find the original because the formula is % times original = total.so you have the total and the % so you just have to plug it in.

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.