Quantitative Aptitude - Arithmetic Ability Questions

If 2cos2A - 1 = x, then the value of x is

What is the x – intercept of the linear equation 18x + 25y – 900 = 0?

In the following question, select the missing number from the given series.
 
1912, 2012, 2133, 2277, 2446, ?

A sum of money (P) doubles in 10 years. How much would it be in 20 years at the same rate of simple interest?

What is the equation of the line perpendicular to the line 5x + 3y = 6 and having Y-intercept -3?

Which one of the following is true for 0°<θ<90°

If 7 + 3x ≥ 5 ­- x/2 and 2x + 3 ≤ 5 -­ 2x; then x can take which of the following values?

The point R(a,b) is first reflected in origin to R1 and R1 is reflected in x-axis to (-3,4). The co-ordinates of point R are