book Maths Puzzle Numerical Ability

Solve the inequality and express the solution in interval notation:

x^2 - 6x + 11 <18

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book Other Question

4. Find the solution set for the following equation. Check for extraneous solutions:

Square root of 8 - 7x = -2(x + 1) The ratio of students to teachers in a school is 18.5 to 1. If there are 1369 students in the school, how many teachers are there?

I know how to do proportions but I have no ide