Answer:

Step-by-step explanation:
<u><em>The picture of the question in the attached figure</em></u>
we know that
The perimeter of a triangle is the sum of the length of their three sides
so

where
a,b,c are the length sides of the triangle
In this problem we have

substitute and solve for the missing length

Answer:
45.2
Step-by-step explanation:
the tenths is the first number to the right after the decimal
Answer: is it on chart? if count rise over run
Step-by-step explanation:
9+6=15 and 15-12=3 so this =3 the -(-6) becomes positive