数学大家帮忙啊，快考试了 1， If N is a positive integerless than 200, and 14n/60 is an integer then n has how many different poitive prime factors? Answer: 3 2, Before being simplified, the instructions for computing incometax in country R were to add 2 percent of one's annual income to the average (arithmetic mean) of 100 units of Country R's currency and 1 percent of one's annual income, which of the following represents the simplified formula for computing the income tax in Country R's currency, for a persom in that country whose annual income is I? Answer: 50+ I/40 3 If xy=1, what is the value of 2(x+y) 平方/ 2( x-y)平方？ answer: 16 4. If n and m are positive integers, what is the remainder when 3的（4n+2)次幂is divided by 10? (1) n=1 (2) m=2 Answer: B 可是着题的公式根本不牵涉到m啊 5 In xy-plane, at what two points does the graph of y =(x+a)(x+b) interesect the x-axis? (1) a+b=-1 (2) The graph intersects the Y-axis at ( 0,-6) 6 这题不明白什么意思 Alice's take home pay last yeat was the same each month,and she saved the same fraction of her take home pay each month, The total amount of money that she had saved at the end of the yeat was 3times the amount of that portion of her monthly take home pay that she did not save. If all the money the she saved last yeat was from her take home pay, what fraction of her take home pay did she save each monthly? Answer: 1/5 7 All of the stocks on the over-the-counter martket are designated by either a 4-letter or a 5-letter code that is creted by using the 26 letter of the alphabet. which of the following gives the maximum number of different stocks that can be designated with these codes? Answer: 27( 26四次方） | 
