exam Maths Puzzle Numerical Ability

hey, can you help me? there is a proof question on my geometry worksheet.

given: B is the midpoint of line segment AC.
prove: AB+CD=BD
proof:
Statments: Reasons

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exam Other Question
An angle and its components always have a sum of 90 degrees. The sum of the measures og the angle and five times its complement is 298 degrees. What is the measure of the angle? x(m+n)+y(m+n)