Maths homework help please

[Toxic Tom]

So the question is

 

A: Add up all the numbers in the sequence 1,4,7,10,13,16.....1000.

The answer is 167167, I can do this.

 

Now onto part B where I am stuck.

 

B: Every third term is removed from the sequence (e.g. 7,16 etc.) find the sum of the new sequence

The answer from the back of the book is:

111445

 

How do you do it?

[The Pizza Thief]

So the question is

 

How do you do it?

 

Have you tried turning it on and off?

[iHammmy]

Have you tried turning it on and off?

Ha...

Ha...

Ha...

[zonahbear]

Have you tried listening in class?

[iHammmy]

Have you tried listening in class?

A listen all the time in math, but still don't get half the shit my teacher is on about

[Tedster]

A listen all the time in math, but still don't get half the shit my teacher is on about

I have it slightly better. Definitely a British thing.

[Bsmith]

ahh, this a question to keep people busy.

 

i would say, take the old answer and substract every third number form it

[FatalityDiablo]

So the question is

 

A: Add up all the numbers in the sequence 1,4,7,10,13,16.....1000.

The answer is 167167, I can do this.

 

Now onto part B where I am stuck.

 

B: Every third term is removed from the sequence (e.g. 7,16 etc.) find the sum of the new sequence

The answer from the back of the book is:

111445

 

How do you do it?

why do they teach you shit like this you will never need this exact bs right there

[jayctech]

7 16.. Is its own sequence (think it goes up in 9s?).

 

If you can find the sum of the first sequence, find the sum of this and subtract.

[iHammmy]

why do they teach you shit like this you will never need this exact bs right there

I guess it just shows that you can understand complicated things and break it down into more managable things

[Toxic Tom]

7 16.. Is its own sequence (think it goes up in 9s?).

 

If you can find the sum of the first sequence, find the sum of this and subtract.

 

Ah I think you're right, thanks!

 

 

Have you tried listening in class?

 

I missed the freaking lesson you scrub

[Toxic Tom]

 

Since you want the sum of the sequence without the 3rd number, you would take original sum-(sum of the every 3rd number sequence)

 

• The Arithmetic Sequence of every 3rd number is 7, 16, 25, 34, by 9, so the last number for every 3rd number would be 997. (111 3rd numbers)
•  
• The sum of this sequence is [(First Number+Last Number)/2]*Number of Numbers
•  
• (7+997)/2=502---> 502*111=111455
•  

 

 

Thanks man!

[Tedster]

Ah I think you're right, thanks!

 

 

 

I missed the freaking lesson you scrub

So why should you be doing homework from that lesson then?

[Toxic Tom]

So why should you be doing homework from that lesson then?

 

Because that's how my school works

 

It's okay, I worked the rest of it out.

[iHammmy]

So why should you be doing homework from that lesson then?

If his teacher is like mine, then we have to do all work, whether we were in or not

[jayctech]

So why should you be doing homework from that lesson then?

That's how school works.

[Tedster]

Because that's how my school works

 

It's okay, I worked the rest of it out.

Your school's ridiculous, but so is our educational system...

[ItsFTP]

Have you tried listening in class?

Have you ever heard that most schools give out homework thats printed from a site thats different from the site where they got the main lessons worksheet from and that most teachers don't teach very well? 

[iHammmy]

https://docs.google.com/document/d/1NZTVIw6n0MYII2V60-eT4kYSd0ZoCty4eU_H9CsFHdI/edit?usp=sharing<-more useful formulas with arithmetic sequences

What do you mean in the first two questions by "Space"?

[Builder]

Come on man. That's easy...

 

And I thought our American public education system was poor!

[iHammmy]

Come on man. That's easy...

 

And I thought our American public education system was poor!

Not if the kid missed the lesson on it...

 

You also have to take into account that some people may struggle more than others ( not saying this is the case here, just saying it can happen )

[Builder]

Not if the kid missed the lesson on it...

lol I never pay attention

 

never take notes either

 

math just sort of flows for me

[iHammmy]

lol I never pay attention

 

never take notes either

 

math just sort of flows for me

Well, I find that hard to believe, but I guess you're lucky.

 

Read my full post that you quoted.

[zonahbear]

I missed the freaking lesson you scrub

Oh, sorry. It was a joke. Don't get offended.

[Builder]

Read my full post that you quoted.

I did...