Answer:
See below
Step-by-step explanation:
11 box 1: 12
11 box 2: 101
12 box 1: 80
12 box 2: 80
12 box 3: 80
13 box 1: 16
13 box 2: 16
13 box 3: 76
20 = y + 12
20 - 12 = y + 12 - 12
8 = y
x + 2 = 19
x + 2 - 2 = 19 - 2
x = 17
z - 313 = 176
z - 313 + 313 = 176 + 313
z = 489
Answer:
Sam
30
Step-by-step explanation:
Sam made a mistake when he said 
. The steps should have been:
You are supposed to square 5 first before multiplying 2. Sam multiplied by 2 first. The correct answer is 30.
A square should have 4 lines of symmetry
In a linear equation:
-- the highest power of the variable that appears is the first power
-- the equation has one solution at most
In a quadratic equation:
-- the highest power of the variable that appears is the second power
-- the equation has two solutions
