11/17/14

Solve the rational inequality
x-1/x+5 <0       Solve rational inequalities 
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11/09/14

what is the number?
translate the problem into a system of 3 equations using 3 variables. solve the system. the sum of the digits of a three-digit number is 12. the tens digit is 2 less than the hundreds digit, and... more
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11/09/14

find the indefinite integral
16x(8x^2 + 9)^4 dx
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10/28/14

A car is twice as old as its radio was when the car was as old as the radio is. The sum of their ages is 49 years. How old is the car and how old is the radio?
physics extra credit- please explain how to do the work
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10/28/14

Flight times between London and Hong Kong are normally distributed with
Flight times between London and Hong Kong are normally distributed with = 12:5 hours and standard deviation = 1:5 hours. (a) (10) Find the probability that a áight will take longer than 14 hours.... more
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10/28/14

A fair die is rolled 30 times. what is the expected number of sixes to turn up in 30 rolls? What is the probability of getting at least 7 sixes in 30 rolls?
This is a question that is on binomial distribution. I have the formula and I also know how to enter it into my ti83 but the answer comes up differently every time. 
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10/21/14

Find the derivative of the logrithmic function
g(x) = ln(2x + 9)
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10/19/14

Compond Interest
Find the present value of $126,488.02 due in 9 years at an interest rate of 11%/year compounded continuously. 
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09/25/14

Find proportion given mean and standard diviation
If a student A scored 34 on a test of reading and the test had a mean of 51 and a standard deviation of 9, what proportion of test respondents scored below student A?
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04/06/14

Find the radius of convergence?
Find the radius of convergence of the power series ∑ (-1)^n*(4x+1)^n from n=0 to infinity.    Answer: 1/4   I did the ratio test and got limit as n approaches to infinity of absolute value of... more
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03/30/14

Find general solution of y'' + y = 3sin(2t) + tcos(2t)
Answer: c1cos(t) + c2sin(t) -1/3tcos(2t) -5/9sin(2t) Please show the work step by step.
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03/30/14

Find general solution of 2y" + 3y' + y = t^2 + 3sin(t)
Answer: c1e^-t + c2e^-t/2 + t^2 +6t + 14 -3/10sin(t) - 9/10cos(t) Please show the work step by step.
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03/30/14

Find general solution y" + 2y' = 3 + 4sin(2t)
Answer: c1 + c2e^-2t + 3/2t - 1/2sin(2t) - 1/2cos(2t)
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03/30/14

Statistics Math Help
Students in a college class were asked to time how long it takes them in minutes to get ready in the morning. Here were the responses: 14, 28, 5, 12, 56, 32, 2, 17Construct a 90% confidence... more
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08/08/13

Find the inverse Laplace transform?
Find the inverse Laplace transform of F(s)=(8s^2-4s+12)/(s(s^2+4)). Answer: f(t)=3-2 sin 2t+5 cos... more
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07/14/13

Suggest me a good textbook for partial differential equations?
What's the name of the textbook for partial differential equations that MIT uses? Name me the title of the book, the edition, author, etc.
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