book Maths Puzzle Numerical Ability

What happens to the inequalities when you do the following to each side of an inequalities?

subtract anegtive number

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book Other Question

Working together, Sarah and Heidi can milk the cows in 3 hours. If they worked alone, it would take Heidi 1 hour longer to milk the cows than it would take Sarah. How long would it I know how to find the x intercepts when graphing a quadratic equation and how to solve the first part of finding the vertex ex:(avg. of x int,?) how do I find the other part? I kn