book Maths Puzzle Numerical Ability

5 times 5=

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please help me find the sum by graphing the corresponding vectors. (1-2i) + (3 + i)i dont even know what that means! Use only the y-intercept to graph y=-2/3xa+4. Explain in consise sentences the process you used.
I'm not sure how to solve this answer. I tried finding the reciprocal and came up