write the equation of the tangent line to f(x)=x+x×x that is

从单词“equation”选取5个不同的字母排成一排,含有“qu”（其中“qu”相连且顺序不变）.
从单词“equation”选取5个不同的字母排成一排,含有“qu”（其中“qu”相连且顺序不变）的不同排列共有?
qu已经选出来了,所以还要从eation中取三个,共有C3/6=20种可能,在把qu看成一个字母与其它三个字母进行全排列,有20*A4/4=480种.我觉得,从eation中取3个进行排列,A3/6.等于120个排列,然后把qu放在每个排列的不同位置,如eat,放在e前面,ea之间等,有4种放法,也就是再乘以4,也是480,
再就是从abcde,五个字母任取四个组合,每个组合必须含有 a,怎么算?是从剩下的四个字母当中选三个进行组合,也就是4个,加上a还是4个.

为什么这个英语听力题的答案是A
M:I was informed that each equation I included in my book will have the
sales when I wrote my last best-seller.
W:Wow!Then you might have sold twice as many
copies!
1.
What does the woman mean?
A) The man shouldn't have included
equations in his book.
B) The man should have included
more equations in his book.
C) The man must have made a lot of
money.
D) The man's books have always
been the best-sellers.
为什么这个听力题的答案是A

英语翻译
write the dissociation equation for the dissolving of solid magnesium fluoride in water.Include phase indicators.

三个小时时差,用英语怎么说?
a three hours equation of time 和 three hours time difference 有什么区别？

can someone help me blance this chemical equation?i really need
Fe2(SO4)3+NH+H2O=Fe(OH)3+(NH4)2SO4
help me blance this equation

以前学过的知识都忘了
1.one of the solutions to the equation x^2+20=-4x is
A -20 B -24 C -2+4i D2+4i e 4i
2.if (2x+3)^1/2-x=0,then x=?
A 0 or -3/2 B -1+/- 2^1/2*i C 3 D -1 E 3 and -1
我主要是不知道这个i是个什么东西

一道sat 数学题
Find an equation of the perpendicular bisector of the line segment joining the points
A(3, 6) and B(11, −2).

用spss17.0做logistic回归分析输出结果怎么解读 Variables in the Equation B S.E.Wald df Sig.Exp(B) S

英语翻译
Calculating the linear regression equation between the copper
supplementation (x) and the percentage improvement of the
average daily body weight gain (y) and feed conversion (y)
respectively

Find the equation of the tangent to the curve y=(x^2-5)^3 at the point (2,-1)

英语翻译
请大家翻译一段英文文献 请不要机翻
In this subsection,we develop equations of the transverse motion of the riser,and of the hydraulic system.
These equations will be used for the boundary control design in the next section.In developing these
equations,we make the following assumption:
Assumption 1.(1) The riser can be modeled as a beam rather than a shell since the diameter-to-length of the
riser is small,i.e.we consider the riser as a slender structure.
(2) Plane sections remain plane after deformation,i.e.warping is neglected.
(3) The riser is locally stiff,i.e.cross sections do not deform and Poisson effect is neglected.
(4) The riser material is homogeneous,isotropic and linearly elastic,i.e.it obeys Hookes’s law.
(5) Torsional and distributed moments induced by environmental disturbances are neglected.
(6) The riser deforms in one vertical plane,and its axial motion is ignored.
那种往谷歌上一粘 直接复制过来的就算了 不要浪费你我的时间 你至少把语句语法理顺了 文章不是很长 希望大家能费一点时间 人工翻译一下

Write a balenced ionic equation for the reaction occurring when:
(a) the addition of metallic aluminum to a copper(II) nitrate solution results in the precipitation of copper metal and the formation of aluminum ions in solution.
(b) metallic copper is added to a dilute solution of nitric acid,gaseous nitrogen(II) oxide is evolved and the solution becames a pale blue
(c) potassium permanganate solution is decolourised by acidified iron(II) sulfate solution.
(d) sulfur dioxide is bubbled through an acidified solution of dichromate ions,the latter is refuced to chromium(III) ions and the sulfur dioxide is oxidised to sulfate ions.
(e) sulfur dioxide in acid solution reduces iodate,iodate,IO3- to iodide ions and is itself oxidised to sulfate ions.
(f) when hydrogen sulfide is passed into a solution of iron(III) nitrate and a pale yellow precipitate is formed.

从单词“equation”中选取5个不同的字母排成一排，含有“qu”（其中“qu”相连且顺序不变）的不同排列共有______种．

let A be a 4*4 matrix with the characteristic equation(1-λ^4).determine if A is diagonalizable.

英文的导数题
Let f(x)=8x+20/(x^2).Then the equation of the tangent line to the graph of f(x) at the point(2,21) is given by Y=mx+b for m=?b=?

The standard equation of a parabola with focus(2,-3) and directrix x=6 is
抛物线的标准方程式 focus(2,-3) and directrix x=6

(a) Find the value of A so that the equation y ' - xy - 6x = 0 has a solution of the form y(x) = A + Be^((x^2)/2) for any constant B.
A=?
(b) If y(0) = 5, find B
B=?

Solve the equation ,Give the solution in exact f
Solve the equation ,
Give the solution in exact form.
不要用翻译软件翻译的

Write a balanced equation depicting the formation of one mole of Pb(NO3)2(s) from its elements in their standard states.
Express your answer as a chemical equation.Identify all of the phases in your answer.

英语翻译
write the equation for the line which passes through the origin and the point (-4,-2).

下面两句哪句语法上更正确?
1.Equation (6) obtained by integrating equation (5).
2.Equation (6) is obtained by integrating equation (5).

三角函数方程问题
Solve the following equation for 0°≤x≤360°.(Give the answers correct to 1 decimal place if necessary.)
-2 tan ( 3x + 6° ) = 1

看不懂英文啊 T T
state whether or not each equation defines a direct variation .for each direct variation ,state the constant of variation.
1,y=3x 2,p=4/q (这些只给一个数,看不懂……）
---------
state whether or not formula shows a direct variation
1,x1/y1=x2/y2 2,x1/x2=y1/y2
3,y1/x2=y2/x1 4,y2/x2=y1/x1
--------
x1=15 ,y1=9
x2=40,y2=?

英文版的
slope intercept equation是求直线方程的意思吗?
尤其不会a) e) h)
loveeee you^ ^

求英文高手(要英文高手）
equation 和 formulars 好像都是方程式的意思 到底有什麼 区别
并翻译一下：
(1)Expressions formed by number and unknowns are algebraic expressions.
(2)Add -3to an unknown （X)and then subtract the sum by 2.
(3)Formula an expression of some results using algebraic expression.

Find an equation of the tangent line to the curve at the given point.y = sin 7x + sin2 7x,(0,0)
y = sin(7x) + sin^2(7x),(0,0)求方程在（0,0）点的切线方程
y=

Find an equation of the line tangent to the graph of 4/x^4 at (3,4/81)
and 3/x^4 at (5,3/625)

Write the equation for the vertical line that passes through the point (-7,5)
我感觉这题没讲完~

从单词”equation”中取5个不同的字母排成一排，含有“qu”(其中”qu”相连且顺序不变)的不同排列共有（） A．120种 B．480种 C．720种 D．840种

1,P is the point (7,5) and L1 is the line with equation 3x+4y=16
(1),Find out the equation of the line L2 which passes through P and is perpendicular to L2.
(2),Find the point of intersection of the L1 and L2.
(3),Find the perpendicular distance of P from the line L1.
------------------------------------------------
可怜小妹的数学初中水平还不够,看来勘定英文是不够的!555555555555555555555555
还有一个公式：gradient =y-step/x-step=1/-m
给出3个点的坐标,如何证明他们形成的角是直角?（use m1m2=-1 to explain it）

帮我做2道英文数学题 谢谢
1.Find the equation of the line which passes through the point (6.-4).And is parallel to the line 2x-3y+3=0.
2.Find the equation of the line which passes through the points P(0,A) and Q(A,2A) .
3.Find the equation of the line perpendicular to 5x+2y-1=0 and passing through the point (-2,7).
谢谢了= =.帮我做下吧.过程最好也写下吧...
是3道..!- -

Solve the equation 2 sin2 x+sinx = 1 for all values of x between 0 and 2π
radians.
符号没打上，2 sin^2 x+sinx = 1是根号2，

以例题一和例题二展开对Henderson–Hasselbalch equation的疑问
例题一：
计算混合4ml 0.1mol/l醋酸与5ml 0.1mol/l的NaOAC时其pH值.
[CH3COOH] = (4/9) x 0.1 mol/l
[CH3COO- ] = (5/9) x 0.1 mol/l
pKa= 4.76
pH = 4.76 + log (5/4)= 4.76 + 0.097 = 4.86
例题二：
a计算含0.1M乙酸和0.1M乙酸钠的缓冲液的PH值.
b乙酸的pKa为4.7.加入0.05M NaOH后pH值为多少?
由HH eq 得：pH=4.7 + lg[0.1/0.1]= 4.7
加入0.05M NaOH后,未溶乙酸浓度降到0.05M ,而乙酸根浓度升高到0.15M,因此pH=4.7 + lg[0.15/0.05]= 5.18
下面是疑问部分（答疑请提供思路并指明以下分析哪里出了问题）：
平衡公式Ka=[A-]*[H+]/[HA] 中使用的是平衡后的未溶的HA的浓度和平衡后的共轭碱的浓度,Henderson–Hasselbalch equation:pH=pKa + log（[A-]/[HA]）,是根据平衡常数 Ka=[A-]*[H+]/[HA] 两边取对数得出的,因此,pH=pKa + log（[A-]/[HA]）相应的也应该使用平衡后的未溶的酸HA和平衡后的共轭碱A-的浓度代入公式求解.于是,则有
在物质的量浓度是C的弱酸溶液HA中,根据HA H+ + A- 因为酸HA的起始浓度是C,设平衡后[H+]=X ,那么平衡后未溶的HA的浓度应该是C-X ,生成的A-的浓度和H+浓度相等,即[A-]=X ,则Ka= X的平方/ C-X ；
然而,上面例题一中 [CH3COOH] = (4/9) x 0.1 mol/l相当于HA的起始浓度C,[CH3COO- ] = (5/9) x 0.1 mol/l相当于A-的起始浓度,它们都不是平衡后的浓度,为何例题一把一个起始酸的浓度和起始共轭碱的浓度代入pH=pKa + log（[A-]/[HA]）来求平衡后的pH?
例题二也是同样的问题；“a计算含0.1M乙酸和0.1M乙酸钠的缓冲液的PH值.”如果它的意思是“配备缓冲液时每一升溶液分别加了0.1mol乙酸和乙酸钠”那么算pH时不应该是pH=4.7 + lg[0.1/0.1]= 4.7 ,因为0.1M只是起始浓度,问题二b也因此无法计算；如果它的意思是“这个缓冲液平衡后乙酸和乙酸钠的浓度均是0.1M”,那么a问的算法pH=4.7 + lg[0.1/0.1]= 4.7则没有问题,但是如果承接这个意思往下到b问,加入0.05M NaOH后,未溶乙酸浓度会降到0.05M ,而乙酸根浓度升到0.15M ,这相当于 “在一升溶液加入0.05mol乙酸,同时加入0.15mol乙酸根,问平衡后的pH值”.因此,在例题二b问中加入0.05M NaOH后,得出的未溶解酸 0.05M和共轭碱0.15M都只相当于一个起始浓度,此时每升溶液中的0.05mol乙酸有一部分还要转化为乙酸根,同时,每升溶液中的0.15mol乙酸根有一部分还要转化为乙酸,当它们平衡后,再把它们平衡后的各自的浓度代入pH=pKa + log（[A-]/[HA]）才是在问题二b问中所求的“加入0.05M NaOH后”的pH值.而在例题二,则直接把0.05M和0.15M这两个浓度代入公式,为何?此时0.05M和0.15M只相当于一个酸和共轭碱的起始量,能代入公式求pH值的应该是它们平衡后的量.不是么?
总括来说,pH=pKa + log（[A-]/[HA]）明明公式里[A-]和[HA]指的是平衡后的浓度,为何例题一和例题二中均用一个酸和共轭碱的起始浓度代入计算?

1 The line l has equation 2x-y-1=0.The line M passes through the point A (0,4) and is perpendicular to the line l.
(a) Find an equation of m and show that the lines l and m intersect at the point P (2,3).the line n passes through the point B(3,0) and is parallel to m.
(b) Find an equation of n and hence find the coordinates of the point Q where the lines L and n intersect.
(c) Prove that AP =BQ=PQ.
2 A,B and C are the points (0,2) (5,7)and(12,0)respectively.
(1) find the lengths AB,BC and CA of the sides of the triangle ABC,and show that AB^2+BC^2=CA^2.
Deduce the size of angle ABC

If x^3m+4 +1=2005 is linear equation with one unknown,the "m" is____(英汉小词典 Linear equation with one unknown:一元一次方程）

一道SAT的数学题
Find an equation for the family of linear functions with slope 2 and sketch several members of the family

the human side of the equation
全句为：The MIT Sloan School of Management attempts to advance our understanding in these areas through research and then quickly bring the fruits of this new research to our students so that they can be leading edge managers when it comes to the human side of the equation.

3维微积分-向量
下列向量式（vector equation）是否代表了同一条直线?为什么?
L1:[x,y,z]=[11,-2,17]+ t[3,-1,4]
L2:[x,y,z]=[-13,6,-10]+ s[-3,1,-4]
L3:[x,y,z]=[-4,3,-3]+ t[-6,2,-8]
如果不同,请解释一下它们为什么不同,是怎么判断的,

write in slope -intercept form the equation of the line that passes through the given ponits.y = -11/7x-19/7
1,(4,9)and(-3,2)
2,(1,8)and (-2,-1)
3,(2,5)and(-8,2)
4,(1,4)and (2,-4)
5,(0,8)and (-9,-16)
-------------
y = -11/7x-19/7
请无视这个…… - -

“an approach that leaves people out of the equation is no longer tenable”
谁能帮我翻译下 这句话?

外国数学问题,请大家帮忙解决.
-solving line equation
y=6(-8-x)-6,
-2(x+2)=-2+2y
-calculating slope and y-intercept
4+x=4(y+3)
-6(y-2)=-24-x
find a perpendicular a line containing a given point
4(x+4)=2x-y (-4,-4)
-3+y=-4(x+8) (-3,7)
find a parallel line containing a given point
7-y=8(1-2x) (-2,8)
2(y-5)=6-5x (-6,-3)
我还要写过程,中文我不懂怎么翻译.谢谢大家.

(log)
1.solve the following exponential equation (use log if necessary)
8(6^(2x+5))=7^(3x-4)
2.solve the following simultaneous equations.
log x = log (5y) -2 ------- (1)
log y - 3 log ((8x+3)^(1/3)) =0 ------- (2)