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There are two ways to solve the equation. One is to simply factorise it and the other is to use the formula provided in the formula booklet. The second method is probably easier when there isn't a nice ea...

You should not be put off by the algebraic letters used, substituting x's for z's is absolutely fine. For the first part of the question, since the equation involves the product of two terms, there are tw...

split the integral into (x^4)/(x^2) and (3x)/(x^2) which becomes x^2 and 3*(1/x). These can now be integrated separately and added together after the integration.

first integral: raise the power fo...

4.28 rounds down to 4; sqrt(99) is approximately 10; 7.83 rounds up to 8

So an appropriate estimate would be:

(4x10)/8 = 40/8 = 5

-13 x + 7 > 2 -13 x > -5 x < 5/13

Remember multiply or divide a number by a negative number, you switch the inequality sign