Quantitative Aptitude - Arithmetic Ability Questions

For triangle PQR, find equation of altitude PS if co-­ordinates of P, Q and R are (1,2), (2,­-1) and (0,5) respectively?

What are the co­-ordinates of the mid point of the segment joining points C(0,­-3) and D(8,5)?

Select the odd word/letters/number/number pair from the given alternatives.

Select the odd word from the given alternatives.

Select the odd word/letters/number/number pair from the given alternatives.

Select the odd word/letters/number/number pair from the given alternatives.

If x = a + 1a, y = a - 1a ,(a>0), then the value of x4+y4-2x2y2 is

In the following question, select the related number from the given alternatives.
 
47 : 57 : : 93 : ?