3 - 15 × 5
a. 90
b. 0
c. –72
d. 78
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Here's a way to remember the order of expression:
Please Excuse My Dear Aunt Sally
(parenthesis, exponents, multiply/divide, add/subtract)
in this case, you'd multiply before you subtract!
-72 ?????
that's correct
To solve the expression "3 - 15 × 5", let's follow the order of operations (also known as PEMDAS or BIDMAS).
PEMDAS stands for Parentheses, Exponents, Multiplication and Division (from left to right), and Addition and Subtraction (from left to right).
The multiplication is performed before the subtraction:
First, we multiply 15 by 5:
15 × 5 = 75
Now, substitute the multiplication result back into the expression:
3 - 75
Finally, perform the subtraction:
3 - 75 = -72
Therefore, the answer is c. -72.