Friday
April 29, 2016

Posts by erica

Total # Posts: 576

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

Calc
Find the integral of 2x/(x^2 + 6x + 13)dx
December 13, 2010

Calc
Verify the differentiation formula. d/dx[arcsin u] = u'/(sq. rt. (1-u^2))
December 10, 2010

Calc
Find the derivative of the function. y = x arccos x - (sq. rt. (1 - x^2))
December 10, 2010

Calc
Find the derivative of the function. h(x) = x^2 arctan x
December 10, 2010

Calc
Find the derivative of the function. f(x) = arctan (x/a)
December 10, 2010

Calc
Verify each identity. a) arcsin(-x) = -arcsin x; abs. val. (x) is less than or equal to 1. b) arccos(-x) = pi - arccos x; abs. val. (x) is less than or equal to 1.
December 9, 2010

Calc
Solve the equation for x. arcsin(sq. rt.(2x)) = arccos(sq. rt(x))
December 9, 2010

Calc
Find the area of the largest rectangle that can be inscribed under the curve y = e^(-x^2) in the first and second quadrants.
December 7, 2010

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