U= the 100 people surveyed A= the 60 people that like coca-cola B= the 55 people that like Pepsi C= the 30 people that liked neither

45 people that like both

Step-by-step explanation:

Given

--- coca-cola

--- Pepsi

--- None

Required

People that like both

Represent this set of people with x.

To solve for x, we have:

Total = Coca-Cola only+ Pepsi only + Both + None

Mathematically, we have:

This gives

Remove brackets and collect like terms

Collect like terms

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