Who has become the first Indian female athlete to win a

If x^2a = y^2b =z^2c ≠ 0 and x² = yz, then the value of (ab + bc + ca) /bc is :

If p = 28 - q - r and pq + r(q + p) = 182, then find the value of (p² + q² + r²).

If a, b and c are integers such that a ²  + b ²  + c ²  = 228, a + b + c = 26 and b = c, then find the value of a?

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

Find the value of ‘x’ in the given expression:

(49/16)^x × (64/343)^x-1 = 4/7

If 9 : 12 :: 12: x, and 28: 42:: 42: y, then the value of 2x + y is: 

If x = 15

find x ⁵ - 16 x ⁴ + 16 x ³ - 16 x ² + 16 x  - 16 = ?