Quantitative Aptitude - Arithmetic Ability Questions

An aeroplane flying horizontally at a height of 3 Km. above the ground is observed at a certain point on earth to subtend an angle of 60°. After 15 sec flight, its angle of elevation is changed to 30°. The speed of the aeroplane (taking √3 = 1.732) is

Simplify 81x2 - 49y29x + 7y

Select the odd letters from the given alternatives.

If the standard deviation of a population is 7, what would be the population variance?

Choose the one which is odd from the following options

What is the value of 26 + 152?

If 3cos2x - 2sin2x = -0.75 and 0°⩽ x ⩽ 90°, then x = ?

If a3 + a - 1 = 0 then find the value of a6 + a4 + a - 2