book Maths Puzzle Numerical Ability

Please explain in detail, I want to do the rest of them myself

Solve each compound inequality. State the solution set using interval notation and graph it


4. x <= 0 and x + 6 > 3

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book Other Question
How much water should be added to 30 gallons of a solution that is 70% antifreeze in order to get a mixture that is 60% antifreeze? {{{bx^2+bx+a^2}}} where a and b are constants, and x is the unknown.