James and Peter have 30 books altogether.
Sandy and James have 50 books altogether.
Peter and Sandy have 40 books altogether.
How many books does Sandy have?

Sandy has 30 books

Step-by-step explanation:

If James has 20 and Peter has 10 it would equal 30

So if Sandy has 30 plus the 20 James has it will equal 50

Peters 10 plus Sandys 30 equals 40

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: