- anonymous

Hello, I just want to know what they want me to do because i don't really understand the question.
(iv) in total from the end of the nth day to the end of the 2nd day. Simplify your answer.
These are the question it asks before;
17. The training programme of a pilot requires him to fly 'circuits' of an airfeild. Each day he flies 3 more circuits than the day before. On the fifth day he flew 51 circuits.
Calculate how many circuits he flew:
(i) on the first day
(ii) in total by the end of the fifth day
(iii) in total by the end of the nth day.
I also have the answers to everything

- jamiebookeater

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- anonymous

idk lol
just try ur best lol

- anonymous

well thanks, but I have to say that doesn't help much!

- anonymous

This is just a complicated way of writing compound interest.

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## More answers

- anonymous

Oh, do you have the answer for (iii)? That one'll give you the formula for the rest, because it's the formula a for 'nth', or any day.

- anonymous

Ok. I got the question before that fine- answer is \[\frac{ 2 }{ n }(3n +1)\]

- anonymous

So thats the answer to (iii)

- anonymous

When they say 2nth, do I times the whole thing by two? Because thats what I understand it to mean.

- anonymous

So stick the number of days in the formula as 'n' and work it out.

- anonymous

Ohhh I see

- anonymous

So I would put in 2?

- anonymous

sorry I was just trying to help :(

- anonymous

Haha, no worries. btw, who doesnt like horses?!

- anonymous

I am still not understanding what to do I am afraid.

- anonymous

btw I hope no one doesn't like horses I love them I do riding actually

- anonymous

Question one, 'n' is one.
Question two, 'n' is five.

- anonymous

Ok, yeah. I go those answers fine.

- anonymous

got* sorry

- anonymous

The answer is \[\frac{ n }{ 2 }(9n+1)\]
can someone just explain how they got that please?

- anonymous

i am not that sure sry... :(

- anonymous

it is asking you to figure out how many flights the pilot made each day

- anonymous

No I mean the last one,where it wants me to calculate how many circuits he flew in total from the end of the nth day to the end of the 2nth day it says. I am not sure how to do that

- anonymous

Oh I just noticed I had a typo in the question there. It was meant to be what I said now- sorry!

- anonymous

so 2nth day not 2nd day

- anonymous

It tells you how many flights were done on the 5th day right?

- anonymous

Yes

- anonymous

14

- anonymous

and it says each day was 3 flights more than the prior day.
So to figure out how many flights were done the day before what should you do, add or subtract?

- anonymous

subtract the difference

- anonymous

14? I read it to say that there were 51 flights on the fifth day.
So, yes. Subtract 3 from 51, and 3 from that answer to count backwards to the first day

- anonymous

I...I have no clue why I typed 51 there.....

- anonymous

ok, so there were 14 flights on the fifth day, still subtract by 3 for each day

- anonymous

##### 1 Attachment

- anonymous

There is all the questions directly from the textbook. I am stuck on (iv)

- anonymous

Ok

- anonymous

ok, n= some number like an X in algebra.
It is asking from some day to the end of the second day. So which day comes before the second day?

- anonymous

first day..a

- anonymous

yes, the first day. So how many were flown on the first and second day?

- anonymous

so 2+ 5 = 7?

- anonymous

2 on first day, 5 on 2nd

- anonymous

Yes, good job

- anonymous

Ok?

- anonymous

ok

- anonymous

No, but that isnt the answer

- anonymous

Why isn't it the answer?

- anonymous

Well the answer in the textbook is \[\frac{ n }{ 2 }(9n+1)\]

- anonymous

give me a minute to think about that

- anonymous

Did you look at the picture I sent? I am afraid I made a few mistakes when typing it out (sorry!) so that might help

- anonymous

yes I did

- anonymous

Ok good.

- anonymous

That answer doesn't look correct for this problem. Are you sure you have the right answer for the right problem? Double check

- anonymous

OK checking...

- anonymous

Thats definitely the right one. Even got my mother to check :)

- anonymous

The questions before those I had no problem with.

- anonymous

If we look at day two and place a 2 where the n is that would indicate that there were 19 flights on the second day, and we know that isn't the case.
You will have to ask the teacher. Good luck

- anonymous

Actually, I am home-schooled. I am the teacher! But no worries I will figure it out. :D Thanks for your time! I appreciate your trying.

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