01/14/14

Find an equation?
Find an equation of the line normal to the graph of y=x^3+3x^2+7x-1 at the point where x=-1.   y'=3x^2+6x+7 y'(-1)=4 m=-1/4 y(-1)=-6   What do I do next? Please show work.
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01/13/14

can you help me with a word problem
Cate wants to buy a new bike. For every $7 she contributes her parents will contribute $3 if cate contributes $203 she has earned from her part time job how much will her parents contribute  
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01/12/14

Factoring an expression
Factor he expression   -216x^3+1   A. (-6x+1)(36x^2+6x+1)   B. (-6x+1)^3   C. (-6x-1)(36x^2-6x+1)   D. prime polynomial   I know the problem is not a prime polynomial. I came up with... more
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01/11/14

Find an antiderivative?
Find an antiderivative of f(x)=e^(x+e^x).   Answer: e^e^x.   Here's the work: f(x)=e^x*e^e^x u=e^x du=e^x dx   How should I set up the integral with this u-substitution? Please show all... more
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01/08/14

Find the rate of the jet
Jane travelled 1080 miles by jet and then an additional 180 miles by helicopter. The rate of the jet was four times the rate of the helicopter. The entire trip took a total of 5 hours. Find the... more
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01/08/14

there are 12 questions,you only have to answer 10. How many different combinations are there?
If you have to answer questions  1-3 ,then how many combinations are there? 
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01/08/14

How can i turn this word problem in an expression or equation?
There are twelve children in the class who collected butterflies for the class project. The teacher added 40 butterflies that he collected, and between the teacher and the twelve students in all... more
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01/07/14

amount originated
if a man spends one fifth of what is in his wallet and then one fifth of what remained, and has spent $72.00, what was the amount originally in his wallet?  
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01/07/14

How do I find the equation in standard form of the parabola passing through the points (2, 20), (-2,-4), and (0,8)?
I've tried to figure it out by substituting the x and y values into an equation (y=ax2+bx+c) and writing a system of equations, but I got confused.
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01/06/14

Write sin(sin^-1x-cos^-1x as an algrebraic expression in x.
This is for my trig class, thanks for the help! If you could, could you please show all your work? Thanks again!
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01/05/14

Establish the identity: tang fada+cot fada divided by sec fada csc fada =1
I am having issues with those one. I do not know how to solve.
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01/05/14

Find the exact value of csc [cos^-1(-square root of 3 divided by 2)]
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01/05/14

Use the quadratic formula to find all solutions in the interval [0,2pi): tan^2x-6tanx+4=0
This is for my trig class, thanks for the help!
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01/05/14

Verify: sin9x+sin5x/cos9x-cos5x=cot2x
This is for my trig class, thanks for the help!
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01/05/14

Verify tan^4x+2tan^2x+1=sec^4x
This is for my trig class, thanks for the help!
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01/03/14

Given sintheta=4/5, theta lies in Quadrant II, find cos (theta/2)
This is for my trig class. Thanks for the help!
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01/03/14

Rewrite sin(x+pi)+sin(x-pi) as a product.
This is for my trig class. Thanks for the help!
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01/03/14

Find all solutions in the interval [0,2pi): 4sin^2x=1
This is for my trig class. Thanks for the help!
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01/03/14

Find all solutions in the interval [0,2pi): tan^2x + (sqrt3-1)tanx-sqrt3 = 0
This is for my trig class. Thanks for the help!
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01/03/14

Find all solutions in the interval [0,2pi): sin2x=cosx
This is for my trig class. Thanks for the help!
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01/03/14

Use the quadratic formula to find all solutions in the interval [0,2pi): tan^2x-6tanx+4=0
This is for my trig class. Thanks for the help!
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01/03/14

Find the area?
  Find the area of the region enclosed by the polar curve r=1-cos θ.   Answer: (3/2)pi
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01/03/14

Calculating percentage and converting? Too long, so I put it in the description :)
Jenna sells Lemonade for $10 per glass. She offers a 20% discount. The price is recalculated then she offers an additional 10% discount. Aidan wants to match her deal by offering a single discount... more
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01/03/14

Kepler's third law
Kepler's third law, T = √(Kr3), can be used to calculate the time it takes for a planet to complete one orbit of a star. The average radius of the planet's orbit in km is r, and K is a constant... more
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01/02/14

There are 5 members in a group. 3 members are can be chosen to go on a trip. How many different groups of 3 can there be?
Word problem that has me confused
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