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If 112 ÷28 x 2² –12 x 6 ÷ 3 +12 = z, then find the value of z.

If = 2 then find

If  a²+2 = 2a

then find a⁴ - a³ + 2a² -2a+ 9 = ?

If a + b + c = 8, a² + b² + c² = 18 and ab + b c+ ca = 12, then what is the value of a³ + b³ +c³ –3abc?

If a = 55, then what is the value of

ABCD is a cyclic quadrilateral in which AB =16.5 cm. BC = x cm. CD= 11 cm. AD 19.8 cm, and BD is bisected by AC at O. What is the value of x?

If x, y and z are real numbers such that (x-5)²+(y-7)²+(z-9)²= 0 then (x+y+z) is equal to

If 4x² + y² = 25 and x y = 6, then find the value  of 2x + y?