In a certain region, the number of children who have been vaccinated against rubella is twice the number who have been vaccinated against mumps. the number who have been vaccinated against both is twice the number who have been vaccinated only against mumps. if 5,000 have been vaccinated against both, how many have been vaccinated only against rubella?

10,000

Step-by-step explanation:

"The number who have been vaccinated against both is twice the number who have been vaccinated only against mumps."

Let b = number of children vaccinated against both.

Let m = number of children vaccinated only against mumps.

b = 2m

"If 5,000 have been vaccinated against both"

5000 = 2m

m = 2500

5000 children are vaccinated against both.

2500 children are vaccinated only against mumps.

The total number vaccinated against mumps is the number vaccinated only against mumps plus the number vaccinated against both:

2500 + 5000 = 7500

"the number of children who have been vaccinated against rubella is twice the number who have been vaccinated against mumps."

total number of children vaccinated against rubella = 2 * 7500 = 15,000

5000 of those children are vaccinated against both.

15,000 - 5000 = 10,000

10,000 children are vaccinated only against rubella.

10,000

i think it is everything has to equal 180 so, if i correct 4=c. 6=d. 8=a. 7=b. and the last question would be c. because they are parallel lines and they are congruent.

step-by-step explanation:

the reason everything has to equal to 180 is because that is how it works. i'm guessing that is its rule. 4 and 8 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 6 and 7 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 60+60 is 180. so, now you have your answer