If a = -9 and b = -4, what is the value of a + b?

-5
5
13
-13

The value is D, -13

Step-by-step explanation:

We know that a is equal to -9, and b equals -4. Let's substitute these values into a + b.

The equation becomes:

-9 + -4

Then we simplify...

-9 + -4 = -9 - 4 = -13

That means the answer is D, -13. Hope this helps!

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.