book Maths Puzzle Numerical Ability

Why does the graph of a quadratic equation intercept the y-axis at only one point?

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book Other Question

Jason earns $4.00/hour working after school and he earns $6.00/hour working on saturday. If he works 18 hours in a week and earned $88.00. How many hours did he work on saturday? What is -5/4 + 1/4 ? How did you get the answer?