exam Maths Puzzle Numerical Ability

please help me in this
let x have the p.d.f f(x)=3x^2 , 0

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exam Other Question

the equation is 1 minus x over 3 in absolute value bars is greater than or equal to 2 over 3. The additive inverse of the number 1 + 4i is:

a. -1 + 4i
b. 1/17 - 4/17 i
c. -1 - 4i
d. 1 - 4i