- A13
- B12
- C4
- D7
Step-by-Step Solution
If all 20 were correct she would score 60. Each wrong answer changes into , a loss of 4. wrong (and 13 correct: ).
Answer: D) 7
In this quiz a correct answer gets +3 and a wrong answer gets −1. Meera answered all 20 questions and scored 32. How many of her answers were wrong?
Class 7Integers (Extended)Integers
Key idea: Multiplying integers — same sign vs different sign
**Same sign → positive.**
(both positive)
(both negative — still positive)
**Different signs → negative.**
3 × (−4) = −12
(−3) × 4 = −12
**Why two negatives become positive:** think of −3 as 'the opposite of 3'. So = 'the opposite of ' = the opposite of −12 = +12. The double-negative cancels.
(both positive)
(both negative — still positive)
**Different signs → negative.**
3 × (−4) = −12
(−3) × 4 = −12
**Why two negatives become positive:** think of −3 as 'the opposite of 3'. So = 'the opposite of ' = the opposite of −12 = +12. The double-negative cancels.
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