Quantitative Aptitude - Arithmetic Ability Questions

If a + b = 17 and a - b = 9 then the value of (4a2 + 4b2) is,

If (-1/2) * ( x - 5) + 3 = -5/2, then what is the value of x?

2sin[(C+D)/2].cos[(C­-D)/2] is equal to

If x = 5 + 15 - 1 & y = 5 - 15 + 1, then find the value of x2 - y2.

$$\begin{gathered} If (x – 2)2 + (y + 3)2 + (z – 15)2 = 0, then what is the value of \\ x + y + z – 5? \end{gathered}$$

What is the value of 99992 x 100008?

What is the area (in square units) of the figure enclosed by the x-axis, the y-axis and the line x + 2y = 6 ?

A boat cover row 12 km upstream in 4 hours and can cover the same distance downstream in 3 hours. What is the speed (in km/hr) of the boat in still water?