GWD-21 Q2. The sum of the first k positive integers is equal to k(k+1)/2. What is the sum of the integers from n to m, inclusive, where 0 < n < m ? (1) m(m+1)/2 - (n+1)(n+2)/2 (2) m(m+1)/2 - n(n+1)/2 (3) m(m+1)/2 - (n-1)n/2 (4) (m-1)m/2 - (n+1)(n+2)/2 (5) (m-1)n/2 - n(n+1)/2 Q7. In the xy-plane, line a and line b have the same slope. If the y-intercept of line a is -1, what is the y-intercept of line b? (1) The x-intercept of line a is -1. (2) Line b passes through the point (10,20). Q10. If d=1(2^3*5^7) is expressed as a terminating decimal, how many nonzero digits will d have? Q14. The charge for a single room at Hotel P is 25 percent less than the charge for a single room at Hotel R and 10 percent less than the charge for a single room at Hotel G. The charge for a single room at Hotel R is what percent greater than the charge for a single room at Hotel G? Q21. A store purchased a Brand C computer for the same amount that it paid for a Brand D computer and then sold them both at higher prices. The store's gross profit on the Brand C computer was what percent greater than its gross profit on the Brand D computer? (1) The price at which the store sold the Brand C computer was 15 percent greater that the price at which the store sold the Brand D computer. (2) The store's gross profit on the Brand D compiter was $300. Q23. On a certain transatlantic crossing, 20 percent of a ship's passengers held round-trip tickets and also took their cars abroad the ship. If 60 percent of the passengers with round-trip tickets did not take their cars abroad the abroad the ship, what percent of the ship's passengers held round-trip tickets? Q24. In the xy-plane, line n passes through the origin and has slope 4. If point (1,c) and (d,2) are on line n, what is the value of c/d? 拜託大家了~謝謝:) --

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