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、鄙人做SAT题中语法部分出现一些问题，求英语牛人相助啊！！！

s home, for a visit, never imaging that five years would pass (before) seeing Derek again.(08050629)

应改为he saw。但是不明白原句为什么不对，before即可为adv,又可为prep,还可为conj.，为什么这里要用conj而不是prep呢？

2、Determined to make a name for herself as a writer of short stories, Helen never submits anything to an editor until （revising） it several times.（09050625）

应改为Helen has revised。问题和1、类似，until 可为conj和prep，怎么区别呢？？？

3、(Opposite to) most people I know, Annie, a good photographer herself, actually enjoys seeing the photographs that her friends take on their vacations.（06050626）

应改为Opposite with,但是两者有何区别呢？

4、Chess players find that playing against a computer is helpful (to improve) their skills, even though no chess-playing computer has yet won a championship.（OC010720）

应改为of improving。 还是不知道区别。

5、Annual visitors to New York City's Central Park number almost ten times (that of) Mount Rushmore.(07100526)

应改为those to。这道题题意不是很明白，帮忙分析下。麻烦了。

悬赏不是很高，但我也是心有余而力不足啊，希望高人捧场！！！", 'contentText': "括号中的部分为原句中的错误部分！

1、Quincy took Dan to Derek's home, for a visit, never imaging that five years would pass (before) seeing Derek again.(08050629)

应改为he saw。但是不明白原句为什么不对，before即可为adv,又可为prep,还可为conj.，为什么这里要用conj而不是prep呢？

2、Determined to make a name for herself as a writer of short stories, Helen never submits anything to an editor until （revising） it several times.（09050625）

应改为Helen has revised。问题和1、类似，until 可为conj和prep，怎么区别呢？？？

3、(Opposite to) most people I know, Annie, a good photographer herself, actually enjoys seeing the photographs that her friends take on their vacations.（06050626）

应改为Opposite with,但是两者有何区别呢？

4、Chess players find that playing against a computer is helpful (to improve) their skills, even though no chess-playing computer has yet won a championship.（OC010720）

应改为of improving。 还是不知道区别。

5、Annual visitors to New York City's Central Park number almost ten times (that of) Mount Rushmore.(07100526)

应改为those to。这道题题意不是很明白，帮忙分析下。麻烦了。

悬赏不是很高，但我也是心有余而力不足啊，希望高人捧场！！！", 'supplyRich': '

3、SAT数学题求解答

What is the smallest possible common multiple of two integers which are both greater than 50?

A 204 B 100 C 51 D 155 E 102 书上答案是C 为什么

还有怎样开立方根 比如说1350 和 600 怎样开立方根

4、SAT 数学题 帮忙解答下

if 3 more than x is 2 less than 9 , what is the value of x ？

if 4 bags of flour with an average (arithmetic mean)weight of 15pounds are put onto a shelf with 45-pound bags of flour , what is the average weight , in pounds of all 8 bags on the shelf ?

a certain ice-cream parlor offers 6 different toppings for sundaes . how many combinations of 2 different toppings from those offered are possible ?

if one of the positive factors of 40 is to be chosen at random , what is the probability that the chosen factor will not be a multiple of 10 ?

the length of each side of an equilateral triangle will be tripled to create a second triangle . the area of the second triangle will be how many times the area of the original triangle ?

when the positive ingeter x is divided by 5 , the remainder is 3 , what is the remainder when x+19 is divided by 5 ?

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