The answer is b because there is a negative in the exponent and the number needs to be a single digit and 54 is double digit. hope this helps!
The slope is negative one
-18. The value has gone down $18 on the gift card.
6 pages:15 mins
18 pages: ?
6(3) = 18
15(3)= 45
it will take him 45 minutes to read 18 pages