exam Maths Puzzle Numerical Ability

The additive inverse of the number 1 + 4i is:

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

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exam Other Question

please help me in this
let x have the p.d.f f(x)=3x^2 , 0 I THINK that this is a linear equation problem. Can you help me solve this? I don't know how to solve for multiple variables in this way:
{{{2x+2z=2}}}

{{{5x+3y=4}}}

{{{3