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November 22, 2014

Posts by Erica


Total # Posts: 535

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

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

eng
i need to know if i underlined the correct topic sentence. if not can you see the topic with in the two paragraphs? 1. When purchasing a car, it can cost more than what it is worth because of not developing the money to buy it. Financing a car to purchase it can cost highly in...
November 17, 2010

english
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

english
it is the second sentence. the underline didn't show up. so i typed it out. does it look correct?
November 17, 2010

english
i need to know if my sentences and grammar are clear, and if i have the correct topic sentence for each paragraph correct. 1. If something will cost more than what it is worth because, you do not have the money to buy it is you can purchase it by financing it. Purchasing ...
November 17, 2010

ENGLISH
1.Purchasing something by financing it can cost you highly in interest rates. 2. When financing something you have interest that comes with purchasing it.
November 16, 2010

ENGLISH
I need to know if MY SENTENCES focus on one key point, The topic sentence relates to the paragraph as a whole, The content is comprehensive, accurate, and effective, Major points are stated clearly; are supported by specific details, examples, or analysis; and are organized ...
November 16, 2010

english
thank you, are the sentences clear and concise,well-constructed, and on topic? grammar and puncuations correct?
November 16, 2010

english
ok thank you i will try again. here are the underlined words. paragrahp 1. < u > text < / u>cost< u > text < / u>worth< / u>cost< u >interest rates, needed,debt,cash, interest or debt,choice, has interest or not. papragraph 2. finance, ...
November 16, 2010

english
i underlined the words but it didn't show up. here they are again. The paragraphs are related to the issue of how interest rates affect our purchasing decisions. The tone is appropriate to the content and assignment. Sentences are complete, clear, and concise. Sentences ...
November 16, 2010

english
Erica P. com/155interest rates • In a total of 200 words, write two paragraphs with about how interest rates affect our purchasing decisions. • Identify the topic sentence in each by underlining it. I need to know if I underlined all of the topic sententeces, They ...
November 16, 2010

adverbs adjectives in comparison Corr.3
1. Assignment: Review - Adjectives, Adverbs, and Comparison • Use at least five adverbs and five adjectives to write a 150- to 300-word review of a movie, sporting event, musical performance, or television show. • Bold each adverb. • Underline each adjective. &#...
November 13, 2010

adver adjectives in comparison corrected
thank you for all of your help i really appreciate it.
November 13, 2010

adver adjectives in comparison corrected
did this correct the run-on?One day, Miyagi witnesses one of the beatings. He intervenes and single handedly defeats Johnny and his friends.
November 13, 2010

adver adjectives in comparison corrected
ok
November 13, 2010

adver adjectives in comparison corrected
is this corrct? In the karate kid 1984, version the mentor Mr.Miyagi was more graceful, (comparative) than Mr. Han when it came to his way of teaching.
November 13, 2010

adver adjectives in comparison corrected
thank you, im a bit confused on how i should correct the run-on. can you tell me what is missing or how i should reword it?
November 13, 2010

adver adjectives in comparison corrected
1. Assignment: Review - Adjectives, Adverbs, and Comparison • Use at least five adverbs and five adjectives to write a 150- to 300-word review of a movie, sporting event, musical performance, or television show. • Bold each adverb. • Underline each adjective. &#...
November 13, 2010

adverbs,adjectives in comparison
thank you, how was my sentence structer?
November 13, 2010

adverbs,adjectives in comparison
t: Review - Adjectives, Adverbs, and Comparison • Use at least five adverbs and five adjectives to write a 150- to 300-word review of a movie, sporting event, musical performance, or television show. • Bold each adverb. • Underline each adjective. • Compare...
November 13, 2010

math
this math is so hard elp
November 8, 2010

physics
same here.I'm panicking because I don't understand anything in that class. Never again will I take physics online.
November 6, 2010

psychology
Today, most psychologists take ____ approach to human development. a nativist an empiricist a dualist an interactionist
November 2, 2010

Statistics
A group of 56 randomly selected students have a mean score of 30.8 and a standard deviation of ó = 4.5 on a placement test. Find a 95% confidence interval for the mean score, ì, of all students taking the test.
November 1, 2010

Stats
A group of 56 randomly selected students have a mean score of 30.8 and a standard deviation of 4.5 on a placement test. Find a 95% confidence interval for the mean score, ì, of all students taking the test. (Note: ó is unknown.)
November 1, 2010

Stats
If a confidence interval for the mean is 24.8 < ì < 29.6. What is the margin of error?
November 1, 2010

5th grade Math
I have to find the function rule that goes with this table... X Y 2 8 4 18 7 33 9 43 12 57 I've been trying to figure it out for an hour and can't find anything that works for all of them.
October 27, 2010

physics-please help!
The total cross-sectional area of the load-bearing calcified portion of the two forearm bones (radius and ulna) is approximately 2.5 cm2. During a car crash, the forearm is slammed against the dashboard. The arm comes to rest from an initial speed of 80 km/h in 4.2 ms. If the ...
October 27, 2010

physics
A sample of blood is placed in a centrifuge of radius 20.0 cm. The mass of a red blood cell is 3.0 10-16 kg, and the magnitude of the force acting on it as it settles out of the plasma is 4.0 10-11 N. At how many revolutions per second should the centrifuge be operated?
October 18, 2010

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