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Mathematics: Post your doubts here!

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and this..\ winter 2008
b i) and ci) ii)
 

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Mai(M4!)
DeadlYxDemon
ahmadumar
Mr.Physics
http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Mathematics (0580)/0580_s13_qp_41.pdf
question 1 part b
question 2 part d help me with tangents
question 3 part aiii how to do it! and part b ii
question 6 part c i and d
question 7 part b
question 8 part aii and iii
question 10 part b iii and d
q 1 part b -> 15-4 = 11
11/4 * 100 = 275%
q 2 part d -> do the graph, draw a tangent at 0.5 then use rise/run method to find gradient
q 3 part aiii -> percentile is percentage of the total frequency.
so 80/100*200
q 3 part b ii -> x/200 = 0.3
ans = 4
q 7 part b -> use simultaneous equations
q 8 part aii -> find x from the previous question. it's an isosceles triangle so base angles are equal, find base angles.
q 8 part aiii -> do 110 - angle CBD you get 79. ADB is an isosceles triangle so you find the same base angles.
 
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please how to find the height of a bar in a histogram if another is given. For example:
 

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Cant find the values! I tried the formula given by them, but ans is quite different! as i tested it with the first value of "x=-3" i got 9.1 but actually is 9.6

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I really dont know knw how to solve the questions below! PLEASE HELP!!!

20120101_050511.jpg
 
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