Wednesday
June 19, 2013

Posts by Melinda

Total # Posts: 149

Calculus-derivatives
Determine the derivative for y=tanxcosx a) y'=-sinxtanx + cosxsec^2x b) y'=-sinxtanx + cosxtanx c) y'=cosxsec^2x d) y'=sinx - cosxsec^2x

Calculus-help~
A certain fast food restaurant wants to determine the increase in revenue per cheeseburger if sales are \$45,000. Let the function [p=(120000-x)/(30000)] represent the price of x cheeseburgers.

Calculus
I used this R(c)=(5000)(4600-400c) R'(c)=-200,000 in the question it says: The owner realizes that 100 fewer people would ride the bus for each \$0.25 increase in fare, and 100 more people would ride for each \$0.25 decrease in fare. So wouldn't it be (100-0.25) and (100...

Calculus
Determine the slope of the tangent to the function f(x)=5xe^x at the point with x-coordinate x=2 a) -1/5 b) 10e^2 c) 15e^2 d) -5e^2

Calculus-concave up and down
I still don't understand :| In the book, they show me a chart with given intervals (For ex. x<-2| -2<x<6| x>6|) Then sub numbers to find if it its concave or up. But this question doesn't have an equation but graph instead.

Calculus-concave up and down
Can someone explain this question to me? What intervals should I use to test whether or not the graph is concave up or down. Here is the URL for the graph. imgur dotcom/FdQCV

Calculus-derivatives
f(x) = (x-1)^(2/3)*(x+3) What are the critical numbers? the derivative would be =2/3(x-1)^(-1/3)(x+3) + (x-1)^2/3 What do I do next?

Calculus
Simplify difference quotients. 1/(1+h)-1/h I got 1-1-h/h but the answer is -1/(1+h)

Precalculus-Verify
log(base2)x-log(base2)6= log(base2)5+ 2log(base2)3 log(x/6)=3log15 (x/6)=15^3 6*(x/6)=15^3*6 x=15^3*6 =20,250 Answer is 270.... What did I do wrong...

Precalculus
What are the restrictions on the variable in the equation log(3x-5)-log(x-2)=log(x^2-5)? 5/3, 2, ???

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