To find: to evaluate the expression correctly what the person R has done differently
Answer to Problem 39STP
The correct answer is C.
Explanation of Solution
Given:
A. Multiplied
B. Divided
C. Multiplied
D. Divided
Rusty is evaluating
Calculation:
Her evaluation is incorrect as while evaluating she did not followed the rules for order ofoperation.
She should have followed the rules for the order of operations, which is as follows.
Step 1. Evaluate the expressions inside the grouping symbolsStep 2. Multiply and/or divide in order from left to right.
Step 3. Add and/or subtract in order from left to right.
So, this expression contains three operations namely division, multiplication and addition.
By rules for the order of operations, multiply and/or divide firstly in order from left to right. And addition is done after that.
Now on looking at the expression, while going from left to right, division comes before multiplication so divide first and then multiply and then add.
Thus the correct evaluation would be as follows:
Thus the correction answer is C.
As, in this option only the order is followed as shown above.
Conclusion:
Therefore, the correction answer is C.
Chapter 1 Solutions
Pre-Algebra, Student Edition
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