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article on "role of media to check corruption"

can you tell me how can i make a chemistry working model for class 9

If 2+i√3 is a root of the eqn x²+px+q=0, where p,q belongs to R, then find the ordered pair (p,q)

If the roots of the eqn 1/(x+p) + 1/(x+p) = 1/r are equal in magnitude but opposite in sign, show that p+r=2r and that the product of the roots is equal to (-1/2) (p²+q²)

Show that if roots of eqn (a²-bc) x²+2(b²-ac)x +c²-ab=0 are equal then either b=0 or a³+b³+c³=3abc.

If the roots of the eqn x²-2cx+ab=0 are real and unequal, then prove that the roots of x²-2(a+b)x+a²+b²+2c²=0 will be imaginary.

Consider the eqn x²+2x-n =0 where n€N and n€[5,100]. Total no. Of different values of 'n' so that the given eqn has integral roots is-

If a,b,c are integers and b²=4(ac+5d²), d €N then roots of the eqn ax²+bx+c=0 are

What is the difference between the mean and median of the first four prime numbers that are more than 4?

Thewhat is the difference between the mean and median of the first four prime numbers that are more than 4? The mean=9 and the median =11.so the ans should be -2.but in the answer sheet the ans is 0..how?

The nth term of the series 5/2,20/13,10/9,20/23.....

46*3=300

4kqq/r^2

Mean=9 Median=11 Is it right? Then the difference between them is -2. But here in the answer sheet the ans is 0!!im really confused