1、SAT数学题求解答

h(t) = -5t^2+120t+m

At time t=0, a rocket was launched from a platform m meters above the ground. Until the rocket hit the ground, its height, in meters, after t seconds was given by the function h above. For which of the following values of t did the rocket have the same height as it did when t=10?

A 8

B 12

C 14

D 16

E 18

2、SAT（英文）数学题求解。附解释

Thesolidbrickshownismadeofsmallbricksofside1.Whenthelargebrickisdisassembledintoitscomponentsmallbricks,thetotalsurfaceareaofallthesmallbricksishowmuchgreaterthanthesurfaceareaofthelargebrick?

A.32

B.40

C.60

D.72

E.80

3、SAT数学选择题，求完整翻译及解题过程

Julie Ann commutes to work one morning at an average speed of 40 mph. She returns home along the same route at an average speed of 24 mph. If she spends a total of 2 hours traveling to and from work that day, how many miles is her commute to work?

(A) 24 (B) 30 (C) 32 (D) 34 (E) 40

4、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

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