12/09/15

Radioactive Isotopes, Exponential Decay
The radioactive isotope 226Ra has a half-life of approximately 1599 years. After 1800 years, there are 2.5g of 226Ra. (1) What was the initial quantity? ____ g (2) How much of it remains after... more
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12/09/15

Radioactive Isotopes, exponential decay
The radioactive isotope 226Ra has a half-life of approximately 1599 years. There are 25g of 226Ra now. (1) How much of it remains after 1200 years? ____ g (2) How much of it remains after 12000... more
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12/08/15

Evaluate the integral below.
Evaluate the integral below.   ∫ 3??^−4?? ????
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12/07/15

Differentiate sinh-1 (tan(x))
Differentiate sinh−1 (tan(x))     ANSWER:  |sec(x)| practice test, #54
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12/07/15

When a cold drink is taken from a refrigerator, its temperature is 5ºC. After 25 minutes in a 20ºC room its temperature has increased to 10 ºC.
When a cold drink is taken from a refrigerator, its temperature is 5ºC. After 25 minutes in a 20ºC room its temperature has increased to 10 ºC. (a) What is the temperature of the drink after 50... more
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12/06/15

Find the derivative : y = log2 (x^2 / (x - 1)
Find the derivative :    y = log2 (x2 / (x - 1)     ANSWER:  1 / ln(2)   *   (2/x  -  1/(x - 1)) #36, practice exam
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12/06/15

Find the exact length of the polar curve. r = e^9x, 0 = x = 2pi
Find the exact length of the polar curve. r = e^(9θ), 0 ≤ θ ≤ 2π
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12/05/15

Cost Function Question
For the cost function C(x) = 529+50 x + x^2 find:a) The cost at the production level 160b) The average cost at the production level 160c) The marginal cost at the production level 160d) The... more
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12/03/15

Series converges or diverges
∞∑  ((3n-2)/(5n+1))^nn=1
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12/03/15

Determine if the sequence converges or diverges
an=(1+(1/n3))^n
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12/02/15

Markov Chains
If the student attends class on a certain Friday, then he is three times as likely to be absent the next Friday as to attend. If the student is absent on a certain Friday, then he is five times as... more
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11/17/15

A weight loss program advertises "LOST 40 POUNDS IN 4 MONTHS".
A random sample of n = 25 customers has x ¯= 31 pounds lost and s = 12. To contradict this claim test H0: μ = 40 versus H1: μ < 40 at α = 0.05.     Find the associated p-value. Round to four... more
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11/10/15

Estimate the area under the graph
Suppose you estimate the area under the graph of f(x)=1x from x=11 to x=111 by adding the areas of rectangles as follows: partition the interval into 50 equal subintervals and use the left endpoint... more
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11/08/15

Find the Maclaurin series for f(x)= 1/(1+x^2)^2
I could really use some help please!
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11/08/15

Find the Maclaurin series for f(x)= x^2/sqrt(x^5+1)
I really have no idea how to go about this, could really use some help, thank you!
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11/04/15

4x + 2y = 12 and y = x - 3. Write the solution to this system of linear equations by typing the intersection point from your TI-83 Plus.
Use your TI-83 Plus to find the solution for this system of equations: 4x + 2y = 12 and y = x - 3. Write the solution to this system of linear equations by typing the intersection point from your... more
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10/27/15

Price Elasticity of demand
If P=80-.4Q what is the price elasticity of demand?
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10/22/15

Calculate the change in internal energy of the following system: A 100.0-g bar of gold is heated from 25°C to 50°C during which it absorbs 322 J of heat. Assume
Calculate the change in internal energy of the following system: A 100.0-g bar of gold is heated from 25°C to 50°C during which it absorbs 322 J of heat. Assume the volume of the gold bar remains... more
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10/05/15

Need help not good in this course
An engineer is going to redesign an ejection seat for an airplane. The seat was designed for pilots weighing between 130 lb and 171 lb. The new population of pilots has normally distributed weights... more
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09/29/15

Find f'(x) and f"(x): f(x)=x/x^2-1
Please help me 
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09/08/15

combustion of methane
CH4 + 2O2 --> CO2 + 2H2O  How many moles of CO2 are produced in this combustion of methane?
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09/03/15

uncertainty in position of electron
The mass of an electron is 9.11x10^-31 kg  What is the incertainty in the position of an electron moving at 4.00x10^6 m/s with an uncertainty of change in v = 0.01x10^6 m/s?
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08/31/15

find the derivative of each of the following
1) f(x)=6x-11/8x+1   2) f(x)=(5x-2)(2x+3)/x-4   3) f(x))=√¯8-5x    
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08/27/15

Simplify (x+cos x)(cos x)-(1+sin x)(1-sin x)/(x+cos x)^2
Please help me
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08/25/15

A 10 foot ladder is leaning against a house and makes an angle of 67 degree's with level ground. How far is the top of the ladder above the ground.
(round to 10th of a foot)
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