How many different "words" can be made from the given word by re-arranging the letters in DIGIT

I,  It,  Dig,  Digit,      

Id,  Ti (the seventh note of a major scale),  Git, Dit (another word for dot)

hope i got them all, and this is what you need.

part a

x     y

0     8

1     7.5

2     7

3     6.5

4     6

5     5.5  

for every hour i deducted .5 inches from the length of the candle

part b

it is a function because for every x value there is only one y value

part   c

for every x value there is only one y value

x       y

0       8

1       7.6

2       7.2

3       6.8

step-by-step explanation: