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函数   题数:57
The y-intercept of a line L is 4. If the slope of L is negative, which of the following could be the x-intercept of L ?I -1II 0III 6
For all numbers a and b, the operation # is defined by a # b = 2a + 2b + 1. What is the value of 6 # 1 ?
If (73/4)n=7 ​, what is the value of n ?
According to a financial analyst, if Company C sets the unit selling price of its product at x dollars, then its monthly profit P, in dollars, is given by the formula P = 1,000(4x - x^2 - 2). According to this formula, at what amount should Company C set the unit selling price of its product so that its monthly profit is $2,000 ?
For which of the following functions is f(a + b) = f(a) + f(b) for all positive numbers a and b ?
An operation θ is defined by the equation a θ b = a−ba+b ​ , for all numbers a and b such that a ≠ –b. If a ≠ –c and a θ c = 0, then c =
In the rectangular coordinate system above, the line y = x is the perpendicular bisector of segment AB (not shown), and the x-axis is the perpendicular bisector of segment BC (not shown). If the coordinates of point A are (2,3), what are the coordinates of point C ?
If [x] is the greatest integer less than or equal to x, what is the value of [–1.6] + [3.4] + [2.7] ?
The function f is defined by f(x) = - 1x ​ for all nonzero numbers x. If f(a) = - 1/2 and f(ab) = 1/6, then b =
【OG20-P181-225题】List T consists of 30 positive decimals, none of which is an integer, and the sum of the 30 decimals is S. The estimated sum of the 30 decimals, E, is defined as follows. Each decimal in T whose tenths digit is even is rounded up to the nearest integer, and each decimal in T whose tenths digit is odd is rounded down to the nearest integer; E is the sum of the resulting integers. If 1/3 of the decimals in T have a tenths digit that is even, which of the following is a possible value of E - S ?1. -16II. 6 III. 10
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