Please solve these for me

Step-by-step explanation:

It was too long to type and explain so I took some pictures of my work. Hopefully you don't mind. Oh and if you want to make sure if they are correct, you can substitute the variable on each equation with the answers i gave for each equation

step-by-step explanation:

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