If 57:X ::51:85, then the value of x is

If a, b, c, d are in proportion, then a : b = c : d and written as a : b : : c : d . If 57 : x = 51 : 85 , then value of x is

If the median of 59, 62, 65, x, x + 2, 72, 85 and 94 is 69, then the value of x is

If the average of 39, 48, 51, 63, 75, 83, x and 69 is 60, then the value of x is

If the ara of the triangle formed by joining the points (2,7) ,(5,1) and (x,3) is 18, then one value of x is-

If [ x cos ( cot^(-1) x ) + sin ( cot^(-1) x) ]^(2) = (51)/(50) then the positive value of x is

If x is the root of the equation x^(2) -ix -1 =0 , then The value of x^(51) is

If x is the root of the equation x^(2) -ix -1 =0 , then The value of x^(51) is

If |(8,-5,1),(5,x,1),(6,3,1)| = 2 , then what is the value of x ?