1. If the base of a triangle is decreased by 30%, and its height is increased by 30%, then the area of the triangle   decreases by 51%   increases by 30%   decreases by 9%   remains unchanged   decreases by 30%   Hint Half-n-half Clue   2. A university has 2000 graduate students. The number of undergraduate students is 5  / 4  times the number of graduate students. What fraction of the students in the university are undergraduates?   9 / 4   9 / 5   5 / 4   4 / 9   5 / 9   Half-n-half Clue   3. The length of the line segment connecting point A (-5, 21) and point B (-25, 6) is   15   25   35   20   625   Half-n-half Clue   4. A particular model of an air-conditioner cost $ 800 five years ago. The same model costs $ 1120 today. By what percent has the cost increased?   40   140   11   108   111   Half-n-half Clue