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Maths, Addmaths and Statistics: Post your doubts here!

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Assalam o alaikum! I'm interested in doing Add Maths, on my own as I can't have tutions or anything else here. So is it like possible? Me studying through internet and books all on my own?
 
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332
Reaction score
396
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73
Assalam o alaikum! I'm interested in doing Add Maths, on my own as I can't have tutions or anything else here. So is it like possible? Me studying through internet and books all on my own?
 
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3,401
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9,793
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523
Assalam o alaikum! I'm interested in doing Add Maths, on my own as I can't have tutions or anything else here. So is it like possible? Me studying through internet and books all on my own?

i dont think its poossible, cuz it is a higher level maths.. u will get all confused.
 
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Someone please tell me what is upper bound and lower bound and how do you calclulate it?
P.S. Is this topic anywhere in the Ds?
 
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After the initiative taken by Math_angel in the IGCSE section, I have made this topic for students of O'levels. You can post any question or any problem here and me along with other XPF users will try to help you as soon as possible. This topic is a feasible option as it won't bring a hassle of making new topics for every question and it will also allow the helpers to not miss any of your questions and have one common topic for answering your Mathematics queries.

So start posting your problems. :)

heres my prob: the Q is
8 – 3t > 14 + t
my answer is not right and the anser in marking scheme is written as (t) < –1.5, –1 1/2, or -3/2.
please explain the procedure...
 
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heres my prob: the Q is
8 – 3t > 14 + t
my answer is not right and the anser in marking scheme is written as (t) < –1.5, –1 1/2, or -3/2.
please explain the procedure...
See, this is easy.
8-3t>14+t
8>14+t+3t
8>14+4t
8-14>4t
-6>4t
-6/4>t
-3/2 or -1.5>t
 
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Messages
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523
I did that like thrice but I'm not getting the correct answer, mind doing that for me?

must be some calculation error.
21.3 (squared) = 20 (squared) + 2 (squared) - 2*20*2*cos.AngleABC
453.69 = 404 - 80*cos.AngleABC
453.69 - 404 = - 80*cos.AngleABC
AngleABC = cos^-1 (-49.69/80)
AngleABC = 128.39
 
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must be some calculation error.
21.3 (squared) = 20 (squared) + 2 (squared) - 2*20*2*cos.AngleABC
453.69 = 404 - 80*cos.AngleABC
453.69 - 404 = - 80*cos.AngleABC
AngleABC = cos^-1 (-49.69/80)
AngleABC = 128.39
Thanks, I guess. But my dheet calculator still gives 51 as the answer :p
 
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