exam Maths Puzzle Numerical Ability

This test is very difficult and any help would be so very much appriciated, please reply asap. The problem is:

Please Simplify
3-5i
2+7i

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exam Other Question
Solve the following system of linear inequalities by graphing.
x – 2y > 4
x < 4 the product of two numbers is 96. their difference is 10. what are the numbers