exam Maths Puzzle Numerical Ability

the conjugate of 1 + i^4 is
a) 0
b)1-i^4
C) 2
d)-2

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The difference between two numbers is 15. when twice the smaller number is subtracted from three times the larger number, the difference is 58. what is the larger number? Thank you... i need a little help with this word problem:
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