Data sufficiency: Isthe expression a+a^(-1) >2 1) a>0 2) a<1 I broke down a+a^(-1)>2 into: a^2 - 2a +1 >0 or a^2 - 2a + 1 <0 (flipped inequalities since we do not know a is positive). this results in (a-1)^2<0 (this is invalid) or (a-1)^2>0. so the rephrased question: Is a>...

Q2: Line K&L intersect in the coordinate plane at point (3,02). Is the largest angle formed at the intersection between these two lines greater than 90degrees? 1) Lines K&L have positive y-axis intercepts 2) The distance between the y-axis intercepts of lines K&L is 5. Answer is D...I do...

thanks for the response....I actually get the visual solution after having typed it out step by step. The solution says that we need to generate a line that is perpendicular, since it is easy to generate a line that is not perpendicular.... It goes on to say that to spread the lines as far apart as ...

Set S is the set of all prime integers between 0 and 20. If the three numbers are chosen randomly from set S, what is the probablity that the sum of these three numbers is odd? Answer is 5/8. The solution explains there are 8 possible prime integers and for the sum to be odd, the choices will be Odd...