book Maths Puzzle Numerical Ability

2. Multiply and simplify:

x^2-x-20 * x^2+7x+10

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x^2-3x-10 x^2+4x-5

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My instructions were to plot data on a scatterplot graph, to creat a line of best fit, and to find the slope of the line and the x-intercept and y-intercept. My question for you is solve triangle ABC using the given info...

a=4, b=6, c=9. please help me!!! and if you could explain that would be great, im so lost!