Who among the following was the first female chairperson

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

(49/16)^x × (64/343)^x-1 = 4/7

Which of the following statements is correct?

I. If x = 12, y = –2 and z = –10, then x³ + y³

+ z³ = 720

If x = (2+√3)/(2-√3), y = (2-√3)/(2+√3)

Then find out the value of (x²+y²-xy)/(x²+y²+xy)

If x – 1/x = 9, then x³ – 1/x³ is:

If x + y + z = 4, xyz = 6 & x² + y² + z² = 8 then find the value of x³ + y³ + z³.

If a – b – c = 0, then the value of (a² + b² + c²)/(b + ac) is:

If x³ + y³ = 9 and x + y=3 then the value of x⁴ + y⁴ is:

If a + b + c = 5, a³ + b³ + c³ = 85 and abc =25, then find the value of a² + b² + c² – ab –bc – ca