So, Jerome bought a total of 80 cards (8x10) out of which he gave out 30 cards (3x10) so he has 50 cards left. (80-30)
C is the answer
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6 feet because 8 / 12 reduces to 2 / 3 and you multiply 2 times 3
The answer to the equation is 15
One million: 10^6
Ten million: 10^7
So the exponent will be anywhere between 6 and 7, inclusive