The answer is 23.2 I just entered the data into an online standard deviation calculator.
Under box 36x + 9, Drag the following:
A.) 9(4x + 1)
D.) (9 . 4x) + (9 . 1)
Under box 9(4x - 1), Drag the following:
B.) (3 . 12x) - (3 . 3)
C.) 36x - 9
Under box (4 . 9x) + (4 . 2), Drag the following:
E.) 4(9x + 2)
F.) 36x + 8
Hope this helps!
Answer:
x = -1
Step-by-step explanation:
Given: 
Solve for x, When: 
Step by step:





C) Length of 7 and Width of 4. This is because 14 x 2 is 28, and 7 x 4 is 28 as well.
I hope this Helps!