Hay guys, i really need this formula for my test. the question is.
if u sub n+1= 40, and u sub n-1=10. what is the value of u sub n.

That depends on what is supposed to be. Most likely it refers to some sequence.

If is arithmetic, then each term in the sequence differs by a constant so that

Then

and we find

and so

On the other hand, if is geometric, then consecutive terms are scaled by some constant so that

Then

so there are two possible values for ,

If is some other type of sequence entirely, then this question would be impossible to answer without more information...

step-by-step explanation: yes

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