Calculus Answers

an observer 70 meters south of a railroad crossing watches an eastbound train traveling at 60 m per sec. at how many meters per second is the train moving away from the observer 4 sec after it passes through the intersection

Let f(x)=x/(x-6). Find a function y=g(x) so that (f*g)(x)=x.

Find the derivative of cot square root x using first principle?

what's integral of y=(e^x)(lnx)?

Integrate 12x^3(6x^4-1)^5dx

find the slope of the line bisecting the angle from the line through (-2,2) and (2,0) to the line through (3,-15) and (10,9)

find the domain of the function f(x)= x
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x^2 - 9

for y=x^4-72x^2-17 use analytic methods to find the exact intervals on which the function is increasing decreasing concave up and down and find the extreme values and inflection points

Mary has a garden in the shape of a sector of a circle; the outer rim of the garden is 25 feet. long and the central angle of the sector is 50 degrees. she wants to add a 3 foot wide walk to the outer rim; how many square feet of paving blocks will she need to build the walk?