I guess 8. Days later
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Answer: $2,000
To calculate the max amount you should owe, multiply the credit limit by 80%. $2,500 * 80% = 2,000
For part a x=0 because anything to the power of 0 is 1
For part b any number could be x, because 7^0 is one and 1 to the power of anything will be 1
Hope this helps!