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Maths, Addmaths and Statistics: Post your doubts here!

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(a)total score:9*3=27
the middle score is 8 so the other two total 19
difference of 7 between them: x+x+7=19
2x=12
x=6
scores 6,8,13

(b)total score:11*4=44
difference is the score 4 fourth game:44-27=17
Why is the total score 27? I know it's because 9 is the mean but I still don't get it
 
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Also please tell me the formula for expression when the diff between sequences is same and formula to find determinant |a| and lastly to find length from given cocodinates
 
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1/1-x +2/1+x +2x/x2 -1 I know it's an easy question but someone please tell me how to simplify these types of questions
 
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Also please tell me the formula for expression when the diff between sequences is same and formula to find determinant |a| and lastly to find length from given cocodinates
matrix is =(a b)
( c d)
then find determinant =(a*d)-(c*b)
Length frm coordinates
e.g.
A(2,3) b(4,6)
length= underroot( (4-2)^2 +(6-2)^2)
 
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yea i saw the same thing in a topical...but HOW?? :([/q
you have to find OR then OR=OP+PR
in this case OP is p
as per ques OR=p-q
so this indicates that PR= -q
find q
then draw -q taking P as origin
B)
OS=OQ+QS
OS=q+hp
so
QS=hp
remember that hp and p are parallel and they hv a relation
just find p and hp and then find h
 
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I understood the part that to make cubic number which 2 is already in cubic form.... But I dont get that part of k (3)(5^2), how r these made into cube numbers and u took 5^2?? :unsure:

look, in the factors of 360 we have 3^2 n 5^1 other than 2, to make each of 3 n 5 a cubic no. we must multiply it with 3^1 so it will become 3^3 n with 5^2 so it will become 5^3 :)
 
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can anyone please explain me the concept pf upper and lower bound....!!! please
suppose u have a value of length of rope 98 cm rounded to the nearest 1 cm
to find its upper bound
98+(1/2)=98.5
lower bound
98-(1/2)=97.5
take another example
length of rectangle is 100 cm rounded to nearest 10 cm
breadth of rect is 55 cm rounded to nearest 5 cm
then upper bound for area= (100+10/2)*(55+5/2)
look to d4 for more help
 
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an easier way would be to just make pairs of arcs from corresponding vertices of the triangle, and make the perpendicular bisectors that way. There is lesser chance of error, and less time wasted :)
And what shud be the length of the arcs?
 
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matrix is =(a b)
( c d)
then find determinant =(a*d)-(c*b)
Length frm coordinates
e.g.
A(2,3) b(4,6)
length= underroot( (4-2)^2 +(6-2)^2)
Thankyou could you please tell me the formula for finding expression in terms of n in number sequence questions when the difference between sequence is same and also the determinant formula for a vector like (1,2)
 
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