Quantitative Aptitude - Arithmetic Ability Questions

If x -­ y = ­7 and x + y = 13, then x2 - y2 is

For triangle PQR, find equation of altitude PS if co­-ordinates of P, Q and R are (6,2), (0,3) and (­-4,5) respectively?

If cos2x + cos4x = 1, then tan2x + tan4x =

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

The distance between the centres of two circles is 61 cm and their radii are 35 cm and 24 cm. What is the length (in cm) of the direct common tangent to the circles?

What is the value of 5/9 + 7/8?

4 hrs after a goods train passed a station, another train travelling at a speed of 60 km/hr following that goods train passed through that station. If after passing the station the train overtakes the goods train in 8 hours. What is the speed of the goods train?

What is the measure of an exterior angle of a regular polygon of 10 sides?