Lena purchased a prepaid phone card for $20. long distance calls cost 21 cents a minute using this card, lena used her card only once to make a long distance
call. if the remaining credit on her card is $12.23, how many minutes did her call last?

37 minutes

Step-by-step explanation:

Lena has 20 dollars. 20 - 12.23 = 7.77

Lena has $7.77 dollars left.

We divide this by .21 to see how many minutes her call was.

7.77 ÷ .21 = 37

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Answer= B

Step-by-step explanation:

For the roots to be right, you will have answer zero if you sub them for x.

A.

(we first try to sub -6 for x in the polynomial)

=

= -384

(this is not equal to zero (-384≠0) so the first polynomial is wrong)

B.

(we do the same as above but in this polynomial)

=

=0

(this is equal to zero but that does not mean it is right because all the roots need to equal zero when you sub them. So now we try 1 and 4)

For (x=1):

=

=0

(because this is zero we will complete and try the root 4)

For (x=4):

=

=0

(this is means that the answer is B because all the roots are equal to zero when you sub them for x)

EXTRA INFORMATION:

The answer is not C because it has different answer when you sub 4 for x - note that you need to try all roots, as 1 and -6 will equal to zero in this polynomial but that does not mean it is the right answer.The answer is not D because it has different answer when you sub all roots - be aware of the signs because the real roots for this polynomial are -1 , -4 and 6 that means it will make you get a wrong answer by subbing the same roots but different signs, so make sure you watch out the negatives.