Answer:
PAGE 1
A. Since PEMDAS 2*3 first
2*3 = 6
then 8/2
8/2 = 4
leaving
11 + 7 - 6 + 4
next 11 + 7
11 + 7 = 18
18 - 6 + 4
18 - 6 = 12
12 + 4 = 16
your answer is 16
B. No because John did not complete his problem correctly. The right answer is 16.
PAGE 2
A. Because of PEMDAS 4 * 12 first
4 * 12 = 48
then 48/3 = 16
your equation comes to
48 + 16 -15
then do
48 + 16 = 64
64 - 15 = 49
the answer is 49
B. If you don't do PEMDAS it can cost you the right answer.
See what answer you get when you don't do PEMDAS and just complete the equation left to right
48 + 4 = 52
52 * 12 = 624
624/3 = 208
208 - 15 = 193
the wrong non-PEMDAS used answer would then be 193
hope this helps:)