Book Maths Puzzle Algebra

Christy has a coin collection consisting of nickels and dimes. She has 28 coins worth $2.25. How many of each coin does Christy have?

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Book Other Question

How do you find the equation of the parabola passing through the points (3,1), (2,3), and (0,-5) A sporting-goods manufacter has spent $1000.00 researching a new product. it will cost them $4.50 to manufacture the item that they will sell for $12.00. How many items must they sell to bearck even?