1、五道SAT数学题求详细解答

In the integer 3589 the digits are all different and increase from left to right. How many integers between 4000 and 5000 have digits that are all different and that increase from left to right?

这是一道填空题，不理解题目意思，求地道翻译+解答

If the letters L, O, G, I, and C are randomly arranged to from a five-letter "word", what is the probability that the result will be the word LOGIC?

A 1/120 B 1/24 C 1/5 D 1/4 E 1/2

求用Cmn或Pmn的排列组合公式做，要步骤及讲解

Three fair coins are tossed at the same time. What is the probability that all three coins will come up heads?

A 1/8 B 1/6 C 1/4 D 1/3 E 3/8

求用Cmn或Pmn的排列组合公式做，要步骤及讲解

If I 6-5y I ＞20, which of the following is a possible value of y?

A -6 B -1 C 1 D 3 E -2

求完整步骤

If g(x)＞0 for all real values of x, which of the following could be the function g?

A g(x)=x + 1 B g(x)=x - 1 C g(x)=x^2 + 1 D g(x)=x^2 - 1 E g(x)x^3 + 1

求完整步骤

2、SAT数学题

谢谢，解释详细一点！

3、sat数学题目

3. One side of a triangle has length 8 and a second side has length 5. Which of the following could be the area of the triangle?

I 24

II 20

III 5

A. I only

B. II only

C. III only

D. II and III only

E. I, II and III

4、Sat数学题

If the average (arithmetic mean) of x, 2x-8, 2x+2, 3x-1,and 4x+1 is 6, what is the value of the mode of these numbers?

正确答案是8，怎么来的？

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