Mathematics

Derivative of lne^x = 1, however, confused by this person's method of solving:

I looked up how to solve this d/dx of lne^x and found this on yahoo answers: (ln(e^x))= e^x/e^x= e^x/e^x= 1 Can someone verify the correctness of this persons steps and explain the prerequisite/inte

What is the inverse of function f(x)=(1/x-3)+2

can you give me detailed step by step because i dont understand this ( i have the answer but i dont understand how to get it)-y=(1/x-3)+2 y-2=1/x+3 x+3=1/y-2 x=(1/y-2)-3 f^-1(x) = (1/x-2) - 3-An inver

How to find the equation of a tangent line for this function

Find the equation of the tangent line to the graph of f(x)=x-2 / x+1at the point which is x=0.-You would use differentiation. The value derivative of a function f(x) at a certain point gives you the s

Using addition or subtraction math problem

How do u solve this using addition or subtraction?? Daniele has 18 marbles. All the marbles are either black or gold. There are 4 more gold marbles than black . How many black marbles are there?-Actu

Algebraic equation question

A rectangular field beside a river is to be fenced with 120m of fencing material. No fence is needed along the river bank. By letting x represent the width of the field, how do you express the length

Math question pleasseeee!

I need help with this could anyone please help I dont understand, try and explain it to please? Another person did this on yahoo but the answers and work is wrong. Suppose you own a car that is suppos

Need help foiling my problem.

My problem is: (x² -3x -54)(x +6) I got this: x³+3x²-72-324-you forgot the x on 72x but yea its right-This is = (x +6) (x² -3x -54) = x(x² -3x -54) + 6(x² -3x -54)= x^3 -3x^2 - 54x+6x^2 - 18x - 324=

Probability of event A and not B?

This is for my statistics class P(A) is .7, P(B) is .25, P(A and B) is .05 I need to find P(A not B) and as far as I know, it should be 0.5/.7 and that is .071 and my book says the answer is 0.65. H

Multiply (2sqrt(3)-4sqrt(5))(4sqrt(3)+8sqrt(5))

(2sqrt(3)-4sqrt(5))(4sqrt(3)+8sqrt(5))=2… 8(3-4*5)=8*(-17)=-136-(2sqrt(3)-4sqrt(5))(4sqrt(3)+8sqrt(5)) = 2(2sqrt(3)-4sqrt(5))(2sqrt(3)+4sqrt(5)) = 2[(2sqrt(3))^2 - (4sqrt(5))^2] = 2(12 - 80) = -136

What is the difference between sale price and marked price

The marked price is the one on the tag. The sale price is often an advertised price, that is a percentage off or special price.-the discount

MATHS HELP, pleeeease

I need this question done ASAP, i need to show full working out. Find the x-intersect, y-intersept and the turning point, use Quadratic formula 3x² - 8x - 3 Thanks Guys *****PLEASE USE QUADRATIC

Perfect square question

In 1990, the population of Centerville was a perfect square. Ten years later, with an increase of 100 people, the population was one more than a perfect square. Now, with another increase of 100 peopl

Need help with this N(x) = -0.4x^2 + 11.2x + 12 -- Will give best answer

The number of tickets sold each day for an upcoming performance of Handels Messiah is given by N(x) = -0.4x^2 + 11.2x + 12, where x is the number of days since the concert was first announced. When wi

Triple integral tetrahedron

Hi everyone I am having trouble what this question is asking me to do. Is it just asking me to write the initial equation? If so I have a rough idea how to do this for double integrals but not so for

Hello, I have a math question

Im trying to figure out how many buttons I have in a jar, I did some calculations but Im sure Im off OK here are the numbers: Total weight of all buttons: 5.25 lbs (excluding the container) I couldnt