book Maths Puzzle Numerical Ability

Find the cost of a package of frozen chicken that weighs 1550 g if the price per kilogram is $2.49. Round to the nearest cent.

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book Other Question

How can you prove that:

odd + odd = even
even + even = even (you initially put even + even = odd)
odd + even = odd

????
Find an equation of the functionwhose graph is a horizontal shift 9 units to the right vertical strecth (by4) of the graph