Shawn uses the same amount of mouthwash each day. The table shows the proportional relationship between the amount
of mouthwash he uses and time in days.
What is the constant of proportionality for the relationship
of teaspoons of mouthwash to time in weeks?
Mouthwash (teaspoons) 30 45 60
5
O O
7
6
9
12
Time (days)
O
35
o
42

the answer is b.

step-by-step explanation:

identity property is where 0+whatever number=whatever number. basically 0+ a number.

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional