exam Maths Puzzle Numerical Ability

Explain how to Foil when factoring a polynomial of the form ax^2+bx+c when a=1
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exam Other Question

write the equation of the line that passes through points 0,-9 with a slope of 6 Larry invested $6000 for one year. He invested part of it at 9% and the rest at 11%. At the end of the year he earned $624 in interest. How much did he invest at each rate?