book Maths Puzzle Numerical Ability

How do you compute the intercepts of a quadratic function?

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Can someone please help with the following qustion. My 13 year old daughter brought this home on a worksheet and we are arguing about the answer. Math (algebra or anything with l A phone company charges $1.00 for the first three minutes of a long-distance call and $0.30 each for additional minute. A 4% federal tax is then added to the coast of the call. Find the total cost of a 23 minute call.