Answer:
31
Step-by-step explanation:
Substitute the values for the variables.

Answer:
9a+12
Step-by-step explanation:
The perimeter is the sum of the side lengths, so is ...
6a + a + 4 + 8 + 2a
= a(6 +1 +2) + (4 +8)
= 9a +12
Answer:
80
Step-by-step explanation:
Each boy can be sketched with all of the girls so. 8*10=80
Answer and working out attached. Hope this helps
Ik this is not what you were looking for but what kind of problem is this lol. i never seen this