If 3x – 4y + z = 7; 2x – z + 3y = 19; x + 2y + 2z = 24, then what is the value of z ?

The number of positive integers n in the range 12  ? n? 40 such that the product (n – 1) (n –2)…3.2.1 is not divisible by n is 

If 4x + 5y = 83 and 3x/2y = 21/22 how much is y – x

Solve for real x: 6x² + 5x - 6 ≥ 0

If x=1+2a+3a²+4a²+……( -1 < a < 1 ) and y=1+3b+6b²+10b³+……( -1 < b < 1 )then find 1+ab+(ab)²+(ab)³+….. in terms of x and y.

The cost of 8 Sharpeners and 12 Pens is Rs. 76/- What is the cost of 20 Sharpeners and 30 Pens?

If n(x) = x² - 10x, then n(-10) =

Let x and y be consecutive integers. Suppose m be the number of solutions of x³ − y³ = 3k² and n be the number of solutions of x³ − y³ = 2t²,where k, t are integers. Then m + n equals:

If (x + 4) (x + 6) (x +1) ²> 0, then the solution set for the inequality is

If 5x + 9 > 3x + 19, what is the range of values x can take?