Because, unless the word "then" in the question is changed to "than", the phrase given means nothing at all. If the word "then" in the question is changed to "than", then the phrase is not ambiguous, even though it can mean, in mathematical terms, either [(-12 + 3) + 7] or [-12 + (3 + 7)], because both of these expressions have a value of -2, illustrating the commutative property of addition.
12
12 + 14 + 3 = 29
(12 + 8) + 3 = 12 + (8 + 3)20 + 3 = 12 + 1123 = 23 ■
3 + 6 + 9 + 12 = 30
It evaluates to: 12+(-1)+(-1)+3 = 13
when x<9
Yes. It takes 12 inches to equal 1 foot, therefore 12 feet plus 3 inches equals 147 inches
12 the correct answer is 12.
12
3 + 12 + 16 = 31
12 + 14 + 3 = 29
-2 is less than plus 3.
12 - 8 + 3 + 5 = 12
(12 + 8) + 3 = 12 + (8 + 3)20 + 3 = 12 + 1123 = 23 ■
3 + 6 + 9 + 12 = 30
It evaluates to: 12+(-1)+(-1)+3 = 13
Without parentheses, the expression is way too ambiguous.