Wednesday

August 24, 2016
Total # Posts: 583

**physical science**

you are standing on a street corner, and you hear a fire truck approaching. does the pitch of the siren stay constant, increase, or decrease as it approaches you? does the pitch of the siren stay constant, increase, or decrease as it moves away?
*May 23, 2011*

**stats**

A company with a large fleet of cars found that the emissions systems of 18 out of the 65 randomly selected cars they tested failed to meet pollution control guidelines. Is this strong evidence that more than 20% of the fleet might be out of compliance? Test the appropriate ...
*May 11, 2011*

**Calc**

To what limit does the sequence Sn = (3+n) /3^n converge as n approaches infinity?
*May 3, 2011*

**Calc**

How do you know what shape the graph in the xy-plane represented by x=3sin(t) and y=2cos(t) is?
*May 3, 2011*

**calc**

The rate that an object cools is directly proportional to the difference between its temperature ( in Kelvins) at that time and the surrounding temperature (in Kelvins). If an object is initially at 35K, and the surrounding temperature remains constant at 10K, it takes 5 ...
*April 25, 2011*

**Calc**

A particle moves along a path described by x=cos³t and y=sin³t. The distance that the particle travels along the path from t=0 to t=π/2 is... Thank you!
*April 25, 2011*

**calc**

If f(x)= (3x)^(3x), then f'(x) = ? Thank you!
*April 25, 2011*

**Calc**

What is the volume of the solid generated by rotating about the y-axis the region enclosed by y=sinx and the x-axis, from x=0 to x=π? Thank you for your help!!
*April 25, 2011*

**calc**

If a particle moves in the xy-plane so that at time t>0 its position vector is (e^(t²), e^(-t³)), then its velocity vector at time t=3 is...? Thanks so much!
*April 25, 2011*

**Calc**

Find the integral from 1 to 0 of arcsin(x)dx Thank you!
*April 25, 2011*

**Calc**

Use differentials to approximate the change in the volume of a cube when the side is decreased from 8 to 7.99 cm. (in cm^3) Thank you so much!!
*April 25, 2011*

**Calc**

Use differentials to approximate the change in the volume of a cube when the side is decreased from 8 to 7.99 cm. (in cm^3) Thank you so much!!
*April 25, 2011*

**Calc**

What is the limit as x approaches infinity of 4xsin(1/x)? Can you also show me how you get the answer? Thank you so much!!
*April 25, 2011*

**goverment**

For the first eleven years of its existence, the United States was a _____.
*April 12, 2011*

**macroeconomics**

a description of a specific macroeconomic phenomenon or event and how it has impacted you
*March 30, 2011*

**hcs 341**

How can an organization forecast future staffing needs in order to maintain consistent staffing levels?
*March 18, 2011*

**social studies**

Christopher Columbus' treatment of Native Americans can BEST be described as friendly, peaceful but not friendly, violent& hostile,or fair?
*March 11, 2011*

**Chemistry**

What is the percentage of potassium chloride to oxygen?
*March 7, 2011*

**Chemistry**

What is the percentage of potassium chloride to oxygen?
*March 7, 2011*

**Calc**

I have to find the integral of 1/(sq. rt. of (4x-x²)) dx. I know I have to complete the square of the denominator, but im confused on how that process works when im only given 4x-x². Could you demonstrate how to complete the square for that equation? Thank you so much!
*February 22, 2011*

**Calc**

The line y = mx+b with b≥2 is tangent to the graph f(x) = -2(x-2)² + 2 at a point in the first quadrant. What are all possible values of b?
*February 22, 2011*

**Calc**

If dy/dt = 2y/(t(t+2)) for t>0 and y = 1 when t = 1, then when t = 2, y = ?
*February 22, 2011*

**Calc**

A rectangle is to be inscribed in a semicircle of radius 8, with one side lying on the diameter of the circle. What is the maximum possible area of the rectangle?
*February 22, 2011*

**calc**

If dy/dx = xy - y^2 and y(1) = 3, then y (2) = ?
*February 22, 2011*

**Calc**

If n is a positive integer, find the limit as n approaches +∞ of 1/n(sin (π/n) + sin (2π)/n + ... + sin (nπ)/n)
*February 21, 2011*

**Calc**

Let f(x) = x^3 - 7x^2 + 25x - 39 and let g be the inverse function of f. What is the value of g'(0)?
*February 21, 2011*

**Calc**

If the substitution u=x^2 + 1 is made, then the integral from 0 to 2 of [(x^3)/(x^2 + 1)]dx = ? Thank you for your help!
*February 21, 2011*

**chemistry**

at 327 degrees C, the equilibrium concentrations are [CH3OH]=0.15M, [CO]=0.24M, and [H2]=1.1M for the reaction: CH3OH(g)<-->CO(g)+2H2(g) Calculate Kp at this temperature
*February 16, 2011*

**Calc**

Find the indefinite integral. Integral of [1/(4+3x²)]dx Thank you so much for your help!
*February 16, 2011*

**Calc**

Find the indefinite integral. Integral of (2x)/(x-4)dx Thank you so much!
*February 16, 2011*

**Calc**

Find the indefinite integral. Integral of (x+1)/(√(x²+2x-4))dx Thank you for your help!
*February 16, 2011*

**Calc**

What is the antiderivative of dy/dx = x/(x^2 + 1)?
*February 15, 2011*

**Calc**

The base of a solid is a circle of radius a, and its vertical cross sections are equilateral triangles. The volume of the solid is 10 cubic meters. Find the radius of the circle.
*February 10, 2011*

**human resource management**

Which of the following would not be an informative or positive message? a. Summary b. Claim adjustment C. Transmittal d. Direct request
*February 8, 2011*

**HUMAN RESOURCE MANAGEMENT**

When writing informative and positive messages, you should include reader benefits when:
*February 8, 2011*

**human resource management**

Informative and positive messages are not necessarily short: Instead , the length of a message depends on all the following EXCEPT:
*February 8, 2011*

**math**

Look at a multiplication table.
*February 7, 2011*

**problem solving**

Try to first multiply it. You should get your answer correct that way. :-)
*February 7, 2011*

**Writing**

what is your guess?
*February 7, 2011*

**REPORT CARD QUESTION**

cooll!
*February 7, 2011*

**Measurments**

What don't you understand the inches or the millimeters?
*February 7, 2011*

**Math**

go to google and type in ixl then click on the website. click on first grade. try this site, and let me know if this helps. :-)
*February 7, 2011*

**Math**

What grade is he in?
*February 7, 2011*

**Math**

Okay is it 1 or i?
*February 7, 2011*

**Math**

Your question is not a question. What are you asking help for? 52 and what number?
*February 7, 2011*

**8th grade science**

help?
*February 7, 2011*

**8th grade science**

Is predator-prey the most important ecological relationship? Thanks everyone!
*February 7, 2011*

**8th grade science**

YESS!!! you are a life saver! ;-)
*February 7, 2011*

**8th grade science**

HELP!!!
*February 7, 2011*

**8th grade science**

On one of my tests they are asking me if Symboin pandora has a symbotic reletionshio with the Norway Lobster. In my lesson the answer is yes but with the NORWEIGAN lobster. Is this a typo or are the two lobsters the same lobster but with different names? I am soooo.... ...
*February 7, 2011*

**Calc**

Set up and evaluate the definite integral for the area of the surface generated by revolving the curve about the y-axis. y = cube rt. (x) + 2 Thank you so much!!
*February 7, 2011*

**Calc**

Set up and evaluate the definite integral for the area of the surface generated by revolving the curve about the x-axis. y = (x³/6) + (1/2x), 1≤ x ≤ 2
*February 7, 2011*

**Calc**

Find the arc length of the graph of the function over the indicated interval. y = (x⁵/10) - (1/(6x³)) , [1,20] Thank you so much!!
*February 6, 2011*

**Calc**

What is the area bounded by the graphs of y = 4x - x² and y = x? Thank you!!
*February 2, 2011*

**Calc**

What is the area of the region located between the graphs of y = -x² + x + 4 and y = 2? Thank you so much!
*February 2, 2011*

**Calc**

How do you integrate sin²x?
*February 2, 2011*

**Calc**

Find the volume of the solid generated by revolving the region bounded by the graphs of the equations about the x-axis. y = sin x, y = 0, x = 0 I just need help setting up the formula. So far I got V= the integral from 0 to pi of [(sin²x) - 0²]dx. Is that correct? ...
*February 1, 2011*

**Pre-Calculus-Trig**

77
*January 30, 2011*

**physics**

I do not know
*January 24, 2011*

**Calc**

The slope of a curve at each point (x,y) is given by 4x - 1. Which of the following is an equation for this curve if it passes through the point (-2,3)? A) y=4x²-x-15 B) y=x²-4x-9 C) y=2x²-x-7 D) y=2x²-x E) y=2x²-x+7
*January 23, 2011*

**Calc**

Given function f defined by f(x) = ( 1- x)³. What are all values of c, in the closed interval [0,3], that satisfy the conditions of the Mean Value Theorem?
*January 23, 2011*

**Calc**

A rectangular box, with a square base and open at the top is to be constructed. If the volume of the box needs to be 108 cubic feet, what is the minimum surface area?
*January 23, 2011*

**Calc**

Various values for the derivative, f'(x), of a differentiable function f are shown below. x=1, f'(x) = 8 x=2, f'(x) = 4 x=3, f'(x) = 0 x=4, f'(x) = -4 x=5, f'(x) = -8 x=6, f'(x) = -12 If f'(x) always decreases, then which of the following ...
*January 21, 2011*

**Calc**

y = x^2 y = 6 - x Find the area of the region by integrating (a) with respect to x and (b) with respect to y.
*January 18, 2011*

**Calc**

y = x^2 y = 6 - x Find the area of the region by integrating (a) with respect to x and (b) with respect to y.
*January 18, 2011*

**Calc**

If y = (cos²x)/(1 + sin x), then dy/dx = ?
*January 18, 2011*

**Calc**

If y = (sec x)/(tanx), then dy/dx = ?
*January 18, 2011*

**Calc**

Limit as x approaches +∞ of x sin (1/x)
*January 18, 2011*

**Calc**

Find the limit as x approaches 0 of (sin x)/(x + tan x)
*January 18, 2011*

**Calc**

Find the limit as h approaches 0 of sin²(3x+3h) - sin²(3x) / h
*January 18, 2011*

**Calc**

Find the limit as x approaches π of (cos x +1)/(x-π)
*January 18, 2011*

**health, safety, and nutrition for the young child**

a child who moved from throwing a ball using only an elbow movement to throwing a ball using her elbow, wrist, and shoulder is showing signs of _____ development. (a)intertask (b)spatial (c)joint-plate (d)intratask
*January 17, 2011*

**Anatomy and Physiology**

Urine passes from the bladder to the outside of the body through a tube called the .Urethra Muscles are attached to bones by structures called .Tendons Communication, integration, and control are the primary functions of two body systems called and . Nervous and Endocrine The ...
*January 12, 2011*

**Anatomy and Physiology**

Movement of bones in the skeletal system is made easier because of the existence of connections between bones called. JOINT Organs arranged in such a way that together they can perform a more complex function than can any one organ alone are called. SYSTEMS The pituitary, ...
*January 12, 2011*

**Physics (Help!)**

Ok thanks. Can 1/2K also be written as K/2?
*January 9, 2011*

**Physics (Help!)**

Can you please explain it a little more. I still don't understand it.
*January 9, 2011*

**Physics (Help!)**

You throw a glove straight upward to celebrate a victory. Its initial kinetic energy is K and it reaches a maximum height H. What is the kinetic energy of the glove when it is at the height H/2?
*January 9, 2011*

**Science-Physics**

That helped a lot. Thank you so much.
*January 9, 2011*

**Science-Physics**

You push a 67 kg box across a floor where the coefficient of kinetic friction is uk = .55. The force you exert is horizontal. (a) How much power is needed to push the box at a speed of .50 m/s? (b) How much work do you do if you push the box for 35 s? *please list the steps to...
*January 9, 2011*

**Algebra-Please check**

1. solve sqrt (11-x) = sqrt(x-7) choices are 6,7,8 or9 I think according to my calcs the answer is (9) The range of f(x) = sqrt(3x-6) - 2 answers would be y<= (-2) y>= (-2) y> (-2) y<=(2) I think the answer is y <= -2, correct I don't get this one at all: ...
*January 8, 2011*

**Calc**

A body of an unknown temperature was placed in a room that was held at 30°F. After 10 minutes, the body's temperature was 0°F, and 20 minutes after the body was placed in the room the body's temperature was 15°F. Estimate the body's initial temperature...
*January 6, 2011*

**Calc**

The number of bacteria in a culture is increasing according to the law of exponential growth. There are 125 bacteria in the culture after 2 hours and 350 bacteria after 4 hours. a) Find the initial population. b) Write an exponential growth model for the bacteria population. ...
*January 6, 2011*

**Calc**

Find the inverse of y = ln (x/(x-1))
*January 3, 2011*

**Calc**

The amount A(t) of a certain item produced in a factory is given by A(t) = 4000 + 48(t - 3) - 4(t - 3)³ where t is the number of hours of production since the beginning of the workday at 8:00 am. At what times is the rate of production increasing most rapidly?
*January 2, 2011*

**Calc**

If f is the function defined by f(x) = cube root of (x² + 4x) and g is an antiderivative of f such that g(5)=7, then g(1) is approx. equal to...?
*January 2, 2011*

**Calc**

t(sec) | 0 | 2 | 4 | 6 | 8 | ____________|_____|_____|_____|____|_____| a(t) (ft/sec²) | 2 | 3 | 4 | 3 | 2 | The table for the acceleration of a particle from 0 to 8 seconds is given in the table above. If the velocity at t=0 is 4 feet per second, the approximation value ...
*January 2, 2011*

**Calc**

Let f and g be differentiable functions such that f(1) = 4, g(1) = 3, f '(3) = -5 f '(1) = -4, g '(1) = -3, g '(3) = 2 If h(x) = f(g(x)), then h '(1) = ?
*January 2, 2011*

**Calc**

Let f(t) = 1/t for t>0. For what value of t is f ' (t) equal to the average rate of change of f on [a,b]?
*January 2, 2011*

**Calc**

Let f be the function given by f(x) = tan x and let g be the function given by g(x) = x^2. At what value of x in the interval 0≤x≤π do the graphs of f and g have parallel tangent lines?
*January 2, 2011*

**Calc**

The volume of the solid formed by revolving the region bounded by the graph of y = (x-3)² and the coordinate axes about the x-axis is given by what integral?
*January 2, 2011*

**Calc**

If, for all real number x, f(x) = g(x) + 5, then on any interval [a, b], what is the area of the region between the graphs of f and g?
*January 2, 2011*

**Calc**

Let f(x) be the function defined by f(x) = {x, x≤0 x+1, x>0 The value of the integral of x(f(x))dx from -2 to 1 =?
*January 2, 2011*

**Calc**

If dy/dx = x²y², then d²y/dx² = ?
*January 2, 2011*

**Calc**

If the integral of (x^2 - 2x + 2)dx from 0 to 6 is approximated by three inscribed rectangles of equal width on the x-axis, then the approximation is equal to what?
*January 2, 2011*

**Calc**

How do you solve ∫sin(3x+4)dx? I got the -cos(3x+4) part, but do you have to integrate the 3x+4 too? Does chain rule apply?
*January 2, 2011*

**Calc**

If t is measured in hours and f '(t) is measured in knots, then integral from 0 to 2 of f '(t)dt = ? (Note: 1 knot = 1 nautical mile/hour)
*January 2, 2011*

**Calc**

If f(x) = e^(sin x), how many zeros does f '(x) have on the closed interval [0, 2π]?
*January 2, 2011*

**Calc**

A line through the origin rotates around the origin in such a way that the angle, θ, between the line and the positive x-axis changes at a rate of dθ/dt for time t≥0. Give the expression for the rate at which the slope of the line is changing.
*January 2, 2011*

**Calc**

The graph of y = 3x^2 - x^3 has a relative maximum at what point?
*January 2, 2011*

**science**

an electron in a one-dimensional box requires photons with a wavelength 8080 nm to excite it from the n=2 energy level to the n=3 energy level. calculate the length of the box
*December 14, 2010*