If and , what is the value of ?
Answer and explanation
Correct answer: C. 3
- 13 is the sum .
- 7 is the difference .
- 10 is the value of () rather than .
- 7 is the difference .
- 10 is the value of () rather than .
- Step 1: Solve for by summing the equations: , so .
- Step 2: Plug into the first equation: .
Answer
3.
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