book Maths Puzzle Numerical Ability

a) What is the sum of the roots of the equation ax2(squared)+ bx + c = 0?
b) What is the product of its roots?

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book Other Question

what is two times three Sarah needs to make a cake and some cookies. The cake requires 3/8 cup of sugar and the cookies require 3/5 cup of sugar. Sarah has 15/16 cups of sugar. Does she have enough sugar,