The visibility, in miles, from a certain spot on a hillside can be calculated using the function d=1.8x, where x is the heigh
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we know that
The conjugate of a complex number is the number with equal real part and imaginary part equal in magnitude but opposite in sign
so
In this problem we have
the conjugate is equal to-------->
therefore
<u>the answer is the option</u>
10+3i