Tuesday

December 1, 2015
Total # Posts: 565

**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*

**Calc**

You need 50 pounds of two commodities costing $1.25 and$1.60 per pound. a) Verify that the total cost is y=1.25x + 1.60(50 - x), where x is the number of pounds of the less expensive commodity. b) Find the inverse function of the cost function.
*December 6, 2010*

**Calc**

Find the inverse of f(x) = (x+2)/x
*December 6, 2010*

**Calc**

Use the derivative to determine whether the function is strictly monotonic on its entire domain and therefore has an inverse function. f(x) = cos [(3x)/2]
*December 6, 2010*

**Calc**

Locate any relative extrema and inflection points. y = (ln x)/x
*December 2, 2010*

**Calc**

Use implicit differentiation to find dy/dx. ln xy + 5x = 30
*December 2, 2010*

**Physics**

What force is required to accelerate an object having a mass of 3 kg at 5 m/s2?
*December 2, 2010*

**Binomial**

Independent samples of n1 = 400 and n2= 400 observations were selected from binomial populations 1 and 2, and x1 = 100 and x2 = 127 successes were observed. What is the best point estimator for the difference ( p1-p2) in the two binomial proportions? a. -0.0675 b. -0.1250 c. 0...
*November 24, 2010*

**Algebra HELP**

How do I solve 2x-4=x-10?
*November 17, 2010*

**eng**

thank you, no i didn't see that the last time. i re-wrote both of the paragraphs instead of using you, i put them in plural form.
*November 17, 2010*

**eng**

the topic sentence in the first paragrhah is >Financing a car to purchase it can cost highly in interest rates. the topic sentence in the second paragrah is >When financing something there is interest that comes with purchasing it. Depending on credit status, interest ...
*November 17, 2010*