exam Maths Puzzle Numerical Ability

Can someone help me with this?

Simplify the product (4 + i) (6 + 7i).
Express the answer in the form a + bi, where a and b are real numbers.

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Graph the solution to the inequality │y � 1│< 2 Angela needs 20 quarts of 50% antifreeze solution in her radiator. She plans to obtain this by mixing some pure antifreeze with an appropriate amount of 40% antifreeze solution. How many quarts of each should she use?