Betty had $70. She bought a necklace for $9 and a ring for $7. Which expression correctly shows the total money Betty has left? A $70 − (−$9) + (−$7) B $70 + (−$9) + (−$7) C $70 − (−$9) − (−$7) D $70 + (−$9) − (−$7) A B C D???
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ANSWERS

2015-11-01 22:38:01

The correct answer would be B) $70+(-$9)+(-$7) because a negative plus a positive cancels out to make a negative, so even though there is a plus and a minus sign it really only means minus. Therefore, you solve it just like a simple math problem $70-$9-$7. In the end Betty ends up with $54 in total having spend $16.

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