Check the picture below.
is simply a 9x9 square, so its perimeter is simply 4*9.
<u>The correct answer is the second option, or 3d + 9</u>
7d + 12 - 4d - 3
<em><u>Combine like terms</u></em>
3d + 9
M<A + m<B = 180
5y + 9y + 68 = 180
14y + 68 = 180
14y = 180 -68
14y = 112
y = 112/14
y = 8
so
m<B = 9y + 68
m<B = 9(8) + 68
m<B = 72 + 68
m<B = 140
The answer is a translation of 2 units to the left and 7 units up