What is the gcf of these monomials?

There's a 30 coefficient on the first and no coefficient (i.e. a 1) on the second.  So the GCF of the constant part is GCF(30,1)=1.

Similarly, because both have as a factor.

because both have as a factor.

Now that we see how the bits work it's not too hard to read these off:

2

step-by-step explanation:

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: