exam Maths Puzzle Numerical Ability

express each answer in the form a+bi
25 over 1+2i would you multiply both top and bottom by 1-2i?

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exam Other Question

find a graph for:
1/2 x-4
2x-4
1/2x+4
2x+4 Which geometric formula needs to be used for: a person hiking a straight track of 5.4 kilometers? They have been hikinbg for 45 min at a rate of 2.4 k per/hr. How much further (formula for)to reach the end of the trail??