板上各位大大好
想請教一下幾題數學還有題意
1. Tickets for all but 100 seats in a 10,000-seat stadium were sold.
Of the tickets sold, 20 percent were sold at half price and the remaining
tickets were sold at the full price of $2. What was the total revenue from
ticket sales?
Ans: 17820
想請問這一題第一句的意思？ 這題好像會算 但是第一句語意看不懂很沒把握@@
不知道這一題的解法是不是：
9900 x (20/100)=1980
7920 x 2 + 1980 - 17820
2. Which of the following could be the units digits of the product of some
integer and itself?
Ans: 0,1,4,5,6,9
原本其中選項還有 2 跟 8
想請問問什麼 2, 8 不是答案呢~
3. 排列組合
Ten chairs are evenly spaced around a round table and numbered clockwise from
1 through 10. Five married couples are to sit in the chairs with men and
women alternating, and no one is to sit either next to or directly across from
his or her spouse. How many seating arrangements are possible?
Ans: 480
4. A decrease in the number of sales personnel in Company K to 85 percent
of the original sales force resulted in a decrease of 500 in the number of
monthly sales.
Column A: The percent decrease in the number of Company K's monthly sales
Column B: The percent decrease in the number of Company K's monthly personnel
Ans: 無法判斷
想請問為什麼不是Column A = Column B
最後還想請問一下各位強者
intercept 到底有沒有正負概念?
因為記得以前高中學的是 截距是絕對值 沒有正負
但是模考的詳解給的都是要變成正負才對的...
麻煩板上的大大幫忙解答了
謝謝!!!