3(x+8)
You know that area of a rectangle is length x width. The width you know is 3 and the length is whatever x is plus 8 more inches, therefore it is x+8.
The answer for coordinates of M is (-2/5, -4/5), and the coordinates of N is (1/5, 1). Hope it help!
This is an equilateral triangle, which means all the sides are the same length. So, the answer is 35. ☺♥
Hope this helps.
Answer:
The correct expression for the perimeter is 
see the explanation
Step-by-step explanation:
The complete question in the attached figure
Let
L ----> the length of rectangle
W ---> the width of rectangle
we know that
The perimeter of rectangle is equal to

In this problem we have


substitute the values



Simplify

so
Michelle didn't multiply the sum of length and width by 2
Multiply everything in the parentheses by the 4
this equals 4x + 2
since one term has a variable and ine doesnt, they cannot be combined.