If 5x - 3x = 2x2/7 Find x .

324 1/2 -------- = ------- 64 1/2

If a+b = 7 and √ (b2 ├»┬┐┬¢ 9)= 4 find 'a'

When a number 'x' is divided by '4' we get the cube of another number, y. Find x if y3<10

If the diameter of a circle is doubled, its area is increased by ------ times.

Which is the next in the series ? 3,13,31,57, --------