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# Pinkgreen

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### If f(x)=ln|(1-x)e^(-3x)|, please find f '(2)=?

4 AnswersMathematics4 months ago### It is a correction for the answer to the normal component in "Find the tangential & the normal component of..."?

Correction: it should be that c=|r'xr"|/|r'^3|=>c=6t^2/[t^3(4+9t^2)^1.5]=>c=6/[t(4+9t^2)^1.5]. Thus, cv^2=6(4+9t^2)t/(4+9t^2)^1.5=>cv^2=6t/sqr(4+9t^2)=

the normal component. Sorry.

Mathematics11 months ago### Please help. 3x^3-x^2-5x+7=0(mod 11), find all possible x.?

1 AnswerMathematics3 years ago### Help please, find the domain of f(x, y)= sqrt( |x|+|y|-3 ). Thanks?

4 AnswersMathematics4 years ago### Help, Math-Pa, how to solve |2x-1|+3|x+1|>5?

4 AnswersMathematics5 years ago### Identify the curve:x^2+4xy+4y^2-3x-6y-50=0, help, please.?

2 AnswersMathematics7 years ago### Please help to solve the following problem, thanks in advance:?

A ladder of 4 m leans against a wall with its feet on the floor. Between the ladder & the wall there is a cubic box of length 1 m at the foot of the wall & the inclined ladder is just touching a corner of the box.

Find the possible heights of the ladder from ground. (Round to 2 decimal places).

3 AnswersMathematics7 years ago### Prove that the sum of i^2 from i=1 to n is n(n+1)(2n+1)/6, without using?

calculus nor mathematical induction.

guys please.

2 AnswersMathematics7 years ago