exam Maths Puzzle Numerical Ability

please help me solve problem number 27 of page 152, Review exercises. thankyou.

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exam Other Question

Factor each of the polynomials completely. 14x^2 - 20x + 6. I factored 14 to 7*2 and 6 to 2*3. then the parenthesis. (7x -3)(2x -2). But what I do not understand is how this would equal 20x. That is the part I am stuck on. I have two problems I need help on please:
It says to solve. Then graph.
1) 9t < -81

2) -3/4x>= -5/8

Could you please show me what it would look like worked out on p