5n - 6 n
2n + 1
If the perimeter of this triangle is 15 centimeters, what is the value of n

1'/4

Step-by-step explanation:

perimeter of a triangle is a + b + c

15 = 5n+n+2n-6+1

15 = 8n - 5

15 - 5 = 8n

10 = 8n

n = 10/8

n = 1'/4

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