Combine like terms for this expression 2+1+(-4r) +7?

(-4r) + 10

Step-by-step explanation:

Like terms are terms that have the same variable.

Terms are numbers separated by additions/subtraction.

2 + 1 + (-4r) + 7             Here, we have four terms.

Three are like terms: 2, 1, 7

They have the same variable, or no variable.

"-4r" is the only term by itself.

Combine the like terms.

2 + 1 + 7 = 10

Rewrite with the term that's by itself.

(-4r) + 10

The expression can be rearranged:

10 - 4r

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.