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?

Step-by-step explanation:

Since she used  $ 7.77

for her only call and since one call costs  $0.21 per minute, you you can compute number of minutes she spent for her last call.

How did we find $7.77:

$20-$12.23= $7.77

Now, $7.77 : $0.21= 37 minutes

Her call lasted 37 minutes

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step-by-step explanation:

hello from mrbilldoesmath!

answer:

the domain is the set { -2, 0, 2, 3}

discussion:

the domain is the set of x values in the ordered pairs (x,y). taking the x, or first component, of each ordered pair gives   -2, 0, 2, 3.

you,

mrb