harrycatcat1 Posted April 15, 2021 Report Share Posted April 15, 2021 Any ideas? Quote Link to comment Share on other sites More sharing options...
harrycatcat1 Posted April 15, 2021 Author Report Share Posted April 15, 2021 I think this is the answer but not sure. This is for a 10 year old 🤔🤔🤔 Quote Link to comment Share on other sites More sharing options...
Ricko Posted April 15, 2021 Report Share Posted April 15, 2021 n is the position in the sequence So for the 10th item, n = 10 (7 x 10) + 2 =72 Quote Link to comment Share on other sites More sharing options...
Ultrastu Posted April 15, 2021 Report Share Posted April 15, 2021 7n+2 is 9 Is not the same as 7n+2 =9 What's the grid for .? Quote Link to comment Share on other sites More sharing options...
harrycatcat1 Posted April 15, 2021 Author Report Share Posted April 15, 2021 13 minutes ago, Ultrastu said: 7n+2 is 9 Is not the same as 7n+2 =9 What's the grid for .? Your guess is as good as mine 14 minutes ago, Ultrastu said: 7n+2 is 9 Is not the same as 7n+2 =9 What's the grid for .? Thanks I'm just trying to get my head around it 👍 Quote Link to comment Share on other sites More sharing options...
Ultrastu Posted April 15, 2021 Report Share Posted April 15, 2021 Rikos solution does make most sense . But the question is as clear as mud .unless there is more explanation in previous questions as the what n is .? Quote Link to comment Share on other sites More sharing options...
harrycatcat1 Posted April 15, 2021 Author Report Share Posted April 15, 2021 53 minutes ago, Ricko said: n is the position in the sequence So for the 10th item, n = 10 (7 x 10) + 2 =72 Sorry, thanks I replied to Ultrastu instead of you 😠 Quote Link to comment Share on other sites More sharing options...
ehb102 Posted April 15, 2021 Report Share Posted April 15, 2021 2 hours ago, harrycatcat1 said: Any ideas? I didn't have a Scooby but I knew you didn't solve the equation normally. I asked a shooting champ I know who happens to be a maths genius (writes maths papers). It’s reversing and balancing an equation to find an unknown. Start by taking 2 from both sides. The remember that 7n means 7 times n so divide both sides by 7 to get the value of 1 lot of n. What you actually need to do is put n= 10 into the expression 7n + 2 and get 70 + 2 = 72 The sequence is 9, 16, 23.... You replace the n with 1 to get the first term, 2 to get the second term etc HTH because I understand what was said but am at a loss as to why it works like that. I need to retake maths. It had moved on since the 90s. Quote Link to comment Share on other sites More sharing options...
dodgy dave Posted April 15, 2021 Report Share Posted April 15, 2021 but what use is it Quote Link to comment Share on other sites More sharing options...
Jim Neal Posted April 15, 2021 Report Share Posted April 15, 2021 I remember as a 14 year old boy being on the verge of tears in a 1-to-1 session with my maths teacher when he was trying to help me get my head around algebra. "BUT YOU CAN'T ADD NUMBERS TOGETHER!!" I protested! Took a while for the penny to drop but credit to my teacher for his patience, we got there in the end. If in doubt, say the answer is 42 Quote Link to comment Share on other sites More sharing options...
WalkedUp Posted April 15, 2021 Report Share Posted April 15, 2021 I got to 72. Finally my A in A Level maths has come in handy almost 20 years later.... Quote Link to comment Share on other sites More sharing options...
WalkedUp Posted April 15, 2021 Report Share Posted April 15, 2021 51 minutes ago, dodgy dave said: but what use is it Education is not necessarily about learning useful information but training your mind in a way of thinking, so that it can be used in different applications. I do not use integration or differentiation in any aspect of my life, but I use the analytical and logical thought processes that were trained in pure mathematics daily. Quote Link to comment Share on other sites More sharing options...
treetree Posted April 15, 2021 Report Share Posted April 15, 2021 72. 7n+2 is the nth term rule. The term to term rule is add 7 to the previous term. If you wanted to know the 137th term in the sequence you could start from 9 and go up in 7 for 137 times or you can use the nth term rule (7x137) + 2 = 961 Quote Link to comment Share on other sites More sharing options...
GingerCat Posted April 16, 2021 Report Share Posted April 16, 2021 In near 42 years I've never needed algebra or the formula to work out the circumference of a circle or volume of a sphere or the stored energy of a rollacoaster ride at the top of a loop. A few times, not many, I've had to count past 20. Quote Link to comment Share on other sites More sharing options...
WalkedUp Posted April 16, 2021 Report Share Posted April 16, 2021 But you have. What you are saying has the same merit as saying “Those nursery rhymes I learnt as a baby haven’t come in much use to me, I never recant them”. Quote Link to comment Share on other sites More sharing options...
amateur Posted April 16, 2021 Report Share Posted April 16, 2021 6 hours ago, GingerCat said: In near 42 years I've never needed algebra or the formula to work out the circumference of a circle or volume of a sphere or the stored energy of a rollacoaster ride at the top of a loop. A few times, not many, I've had to count past 20. Ah!, but you are a copper Quote Link to comment Share on other sites More sharing options...
discobob Posted April 16, 2021 Report Share Posted April 16, 2021 8 minutes ago, amateur said: Ah!, but you are a copper so to count past twenty it must have been shoes and socks off - plus the help of a colleague!!! Quote Link to comment Share on other sites More sharing options...
TIGHTCHOKE Posted April 16, 2021 Report Share Posted April 16, 2021 We always appreciated being apprehended by the RAF Police Dog Handlers, as at least you had someone to talk to! Quote Link to comment Share on other sites More sharing options...
dead eye alan Posted April 16, 2021 Report Share Posted April 16, 2021 11 minutes ago, discobob said: so to count past twenty it must have been shoes and socks off - plus the help of a colleague!!! He could get past twenty if his parents were from Norfolk. 😉 Quote Link to comment Share on other sites More sharing options...
harrycatcat1 Posted April 16, 2021 Author Report Share Posted April 16, 2021 (edited) Thanks to everyone who responded I didn't have a clue. Is this what 10 year olds have to learn nowadays, I don't think I did this stuff 54 years ago? Edited April 16, 2021 by harrycatcat1 Quote Link to comment Share on other sites More sharing options...
discobob Posted April 16, 2021 Report Share Posted April 16, 2021 1 hour ago, dead eye alan said: He could get past twenty if his parents were from Norfolk. 😉 Leave Norfolk out of this - @ditchman is feeling a bit delicate on these matters now 😂 Quote Link to comment Share on other sites More sharing options...
Ricko Posted April 16, 2021 Report Share Posted April 16, 2021 In terms of 'when will I ever use this', I tend to explain that learning Mathematics helps develops different aspects of the brain: reasoning, logic, problem solving, acceptance of new ideas etc. The maths subject content has hardly changed in the almost thirty years I've been teaching it. I always tell pupils that they'll get a genuine 20th century education from me at no extra cost! Quote Link to comment Share on other sites More sharing options...
GingerCat Posted April 16, 2021 Report Share Posted April 16, 2021 10 hours ago, amateur said: Ah!, but you are a copper Used to be a cnc machine operator with 2 18 feet band saws, a flat bed loader thingy and 20 head moulder. Still didn't need gcse math. Quote Link to comment Share on other sites More sharing options...
wascal Posted April 16, 2021 Report Share Posted April 16, 2021 20 hours ago, dodgy dave said: but what use is it It depends on context . try this ! a= 20 , b =? ,c =18 501 = 7a + 3b + 2c what is b ? The vast majority of you have tried this ! Quote Link to comment Share on other sites More sharing options...
Mice! Posted April 16, 2021 Report Share Posted April 16, 2021 35 minutes ago, GingerCat said: Used to be a cnc machine operator with 2 18 feet band saws, a flat bed loader thingy and 20 head moulder. Still didn't need gcse math. I think I've got you there, did you never use trig? Basic math and trig is about all I ever use. 19 hours ago, WalkedUp said: Education is not necessarily about learning useful information but training your mind in a way of thinking, so that it can be used in different applications. I do not use integration or differentiation in any aspect of my life, but I use the analytical and logical thought processes that were trained in pure mathematics daily. Bang on, it's good to make the grey matter work, but I'm very glad my mrs is a lot smarter than me 😄 Quote Link to comment Share on other sites More sharing options...
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