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What is the average of the first 20 multiples of 12?

If (x ² = 6x – 9), then find the value of [x³ + (x⁴/9)][5 - x³]

If x + y = 2 and 1/x + 1/y = 18/15, then find the value of (x³ + y³)?

If (r + s + t) = 12 and (rs + st + tr) = 60, then find the value of (r² + s² + t²).

If A = (7)^1/3 + (7) ^-1/3, then the value of {3A³ – 9A} will be:

if x² – 2x + 1 = 0, then find the value of (x⁷ + x⁵ + x⁴ + x²)/x ?

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

If a = 701, b= 703 and c= 706, then find the value of a³ + b³ +c³ –3abc?