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700-730   题数：35
Before being simplified, the instructions for computing income tax 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 person in that country whose annual income is I ?
Right triangle PQR is to be constructed in the xy-plane so that the right angle is at P and is parallel to the x-axis. The x- and y-coordinates of P, Q, and R are to be integers that satisfy the inequalities-4 ≤ x≤ 5and 6≤y≤16. How many different triangles with these properties could be constructed?
In a class of 30 students, 2 students did not borrow any books from the library, 12 students each borrowed 1 book, 10 students each borrowed 2 books, and the rest of the students each borrowed at least 3 books. If the average (arithmetic mean) number of books borrowed per student was 2, what is the maximum number of books that any single student could have borrowed?
I. 72, 73, 74, 75, 76II. 74, 74, 74, 74, 74III. 62, 74, 74, 74, 89The data sets I, II, and III above are ordered from greatest standard deviation to least standard deviation in which of the following?
If n is the product of the integers from 1 to 20 inclusive, what is the greatest integer k for which 2k is a factor of n?
Greg assembles units of a certain product at a factory . Each day he is paid $2.00 per unit for the first 40 units that he assembles and $2.50 for each additional unit that he assembles that day . If Greg assembled at least 30 units on each of two days and was paid a total of $180.00 for assembling units on the two days, what is the greatest possible number of units that he could have assembled on one of the two days ?
In a certain sequence, the term xn is given by the formula xn = 2xn-1 - 1/2*(xn-2) for all n ≥ 2. If x0 = 3 and x1 = 2, what is the value of x3?
【OG20-P153-50题】If S=1+1/22 +1/32 +1/42 +1/52 +1/62 +1/72 +1/82 +1/92 +1/102 ,which of the following is true?
A certain characteristic in a large population has a distribution that is symmetric about the mean m. if 68 percent of the distribution lies within one standard deviation d of the mean, what percent of the distribution is less than m+d?
On a recent trip, Cindy drove her car 290 miles, rounded to the nearest 10 miles, and used 12 gallons of gasoline, rounded to the nearest gallon. The actual number of miles per gallon that Cindy’s car got on this trip must have been between
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