Question

P= a + b + c; P = 28, a =5, b = 11 (Perimeter of a triangle)

Answer 1

Answer:

c = 12.

Step-by-step explanation:

Fill in what you know. 28 = 5 + 11 + c. Add 5 and 11 together. 28 = 16 + c. Then subtract 16 from both sides 28 - 16 = 16 - 16 +c. Then the number you have left is your answer.

Answer 2

Answer:

c=12

Step-by-step explanation:

P=a+b+c

28=5+11+c ; combine 5 and 11.

28=16+c ; subtract 16 from each side to get c

28-16=12