FIRB method of planting is followed in which crop?

If (4x + 3y): (28x - y) = 1: 5, then what is the value of (3x ²  + 4y ² ): (7x ²  + 2y ² )?

What will come in place of the question mark (?) in the following series?

23, 46, ?, 184, 368, 736

If both the roots of x ²  + kx + 49 = 0 are real and equal, then find the value of 'k'.

Find ‘x’ if (x³+3x)/(3x²+1) = 189/61

If p = 32 - q - r and pq + r(q + p) = 255, then find the value of (p² + q² + r²).

 If f(x) = 3x² − 7x + 5, find f(2a) − 4f(a).

If x = 15, find x⁵ - 16x⁴ + 16x³ - 16x² + 16x - 16 = ?

If √t + (1/√t) = 5, then find the value of t + (1/t).

3^x +3^y =10 and 3^x+y =5 then find the value of 3^x-y +3^y-x.