Book Maths Puzzle Co-ordinate geometry

Where is the vertex of the graph of y=x^2-5?

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Book Other Question

The sum of two digits of a two digit number is seven. If the digits are reversed, the new number is nine less than the original number. Ann's age is seven-tenths of Bills age. In 4 years Ann's age will be eight-elevenths of Bill's age. How old is Bill now?