book Maths Puzzle Numerical Ability

question is: f(x)=2x^2-x-1

List the y-intercept, if there is one, of the graph of f(x).

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how do you change 3 5/8 into a improper fraction? Stuck on homework thanks How many yards of felt will I need total to make 8 slipcovers that are 43 1/2 inches long and 19 inches wide?