8a - 2b + 12a - 2a - 4b Evaluate the expression when a = 4 and b = 22. Show your work.

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-52

Step-by-step explanation:

8.4-2.22+12.4-4.22=

=32-44+48-88=

=-132+80=

=-52

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