Find the constant of proportionality r in the equation y = rx

r =

Step-by-step explanation:

Given x and y are proportional and

y = rx ← r is the constant of proportionality

To find r use any ordered pair from the table

Using x = 15, y = 3, then

r = = =

the ratio of balloons to tables is 5: 2 and the constant variation is 5.

the equation is y=5x

the total estimated nappy use.=10,500,000

step-by-step explanation:

given that on an average the average baby uses 3528 napkins.

in a particular year 2014, the number of births were 299697 in new south wales.

rounding off the number of births to the nearest hundred thousand we have

no of birtsh = 300000

also rounding off the average usage to nearst thousand we get

average use of a baby = 3500

hence total number of nappy estimated to be used = 3500x300000

= 10,500,000

answer is 10,500,000 nappies