Quantitative Aptitude - Arithmetic Ability Questions

Select the odd word from the given alternatives.

If x + (1/x) = 2, then what is the value of x21 + (1/x1331)?

What is the value of tan­ -240°?

If xa+b+1=xa-b+a-ba+b, then x is equal to

A runner starts running from a point at 6:00 am with a speed of 8 km/hr. Another racer starts from the same point at 8:30 am in the same direction with speed of 10 km/hr. At what time of the day (in p.m.) will the second racer will overtake the other runner?

What is the value of 36+729381+643

If the radius of a circle is increased by 21%, then its area will increase by what percent?

25% discount is offered on an item. By applying a promo code the customer wins 8% cash back. What is the effective discount?