Monday
December 22, 2014

Posts by Robin


Total # Posts: 328

pre-algebra
how do i solve -x=-7
December 16, 2014

kendriya vidyalaya
How to write 22nd November 2014 in 9 letters
November 23, 2014

Chemistry
I figured it out. I got the wrong K value too. You have to take e^-(-1.893) so e^(1.893)=6.63 From there, K=(x)/(.3-x)(.4-x) where K=6.63 Solve for x and you get 0.178 To find the values, plug in 0.178 for x to find values at equilibrium.
November 6, 2014

Chemistry
I thought you would just set up an ICE table and subtract .15 from the reactants and add .15 to the product but that is not right.
November 6, 2014

Chemistry
A reaction: A(aq)+B(aq)<-->C(aq) has a standard free-energy change of –4.69 kJ/mol at 25 °C. What are the concentrations of A, B, and C at equilibrium if, at the beginning of the reaction, their concentrations are 0.30 M, 0.40 M, and 0 M, respectively? I know ...
November 6, 2014

college statistics
how many ways can a 3 person committee be formed from 12 people
November 5, 2014

math
2y+10x=10
October 25, 2014

math
2+2
October 5, 2014

Statistics
Assume that a procedure yields a binomial distribution with a trial repeated n times. Use the binomial probability formula to find the probability of x successes given the probability of success on a single trial, n=9, x=2, p=0.35.
August 25, 2014

Chemistry
which ka value would we use and would the concentrations of the acid and base be the same?
August 7, 2014

albebra
solve arithmetically and algebraically. The perimeter of a rectangle is 54 cm. Its length is 6 cm. What is its width?
April 14, 2014

math
Jerry is 50 inches tall growing at a rate of 1/24 inches per month. Adam is 47 inches tall growing at a rate of 1/8 per month. If they continue to grow at these rates for the next 4 years in how many months will they be the same height? Solve two different ways and show ...
April 14, 2014

business communication CO210
Prepare a one-page description of your plans to solve the problem for one of the following research studies. Use the following headings for the problem:
April 8, 2014

Physics
A single force acts on a 1.1 kg particle-like object in such a way that the position of the object as a function of time is given by x = 4.1t - 3.6t2 + 4.5t3, with x in meters and t in seconds. Find the work done on the object by the force from t = 0 to t = 8.6 s.
March 8, 2014

Physics
The force on a particle is directed along an x axis and given by F = 1.7(x/2.8 - 0.95) where x is in meters and F is in Newtons. Find the work done by the force in moving the particle from x = 0 to x = 6.9 m.
March 8, 2014

Physics
Three vectors are given by: a=0i+oj+4.0k b=3.0i+-3.0j+-1.0k c=1.0i+2.0j+-1.0k a) Find a(bxc) b) Find a(b+c)
February 25, 2014

accounting
If on the opening day of business, you put in supplies worth $250 and $3000 cash, would that be considered a transaction OR would it be considered your beginning balances because it's the first day of business? Would it be considered beginning capital OR a credit to ...
February 24, 2014

Physics
Some insects can walk below a thin rod (such as a twig) by hanging from it. Suppose that such an insect has mass m and hangs from a horizontal rod as shown in the figure, with angle θ = 37°. Its six legs are all under the same tension, and the leg sections nearest the...
February 17, 2014

Physics
a vector with a magnitude of 17.6 m is directed at angle θ = 43o counterclockwise from the +x axis. What are the components (a) ax and (b) ay of the vector? A second coordinate system is inclined by angle θ' = 20o with respect to the first. What are the ...
February 9, 2014

Physics
A train at a constant 41.0 km/h moves east for 28 min, then in a direction 53.0° east of due north for 15.0 min, and then west for 64.0 min. What are the (a) magnitude (in km/h) and (b) angle (relative to north, with east of north positive and west of north negative) of ...
February 9, 2014

Physics
A plane flies 407 km east from city A to city B in 44.0 min and then 871 km south from city B to city C in 1.90 h. For the total trip, what are the (a) magnitude (in km) and (b) direction of the plane's displacement, the (c) magnitude (in km/h) and (d) direction of its ...
February 9, 2014

Physics
Three vectors are given by a= 0i+0j+4.0k , b= 3.0i+ -3.0j+-1.0k and c=1.0i+2.0j+-1.0k. Find (a) a(bxc) and (b)a(b+c)
February 9, 2014

Physics
For the vectors with a = 3.3 and b = 2.2, what are (a) the z component of AxB, (b) the z component of AxC, and (c) the z component of BxC?
February 9, 2014

Physics
A vector with a magnitude of 17.6 m is directed at angle θ = 43o counterclockwise from the +x axis. What are the components (a) ax and (b) ay of the vector? A second coordinate system is inclined by angle θ' = 20o with respect to the first. What are the ...
February 9, 2014

Physics
In the sum A+B=C, vector A has a magnitude of 10.2 m and is angled 48.0° counterclockwise from the +x direction, and vector C has a magnitude of 15.0 m and is angled 22.0° counterclockwise from the -x direction. What are (a) the magnitude and (b) the angle (relative to...
February 9, 2014

Physics
Oasis B is a distance d = 7.0 km east of oasis A, along the x axis shown in the figure. A confused camel, intending to walk directly from A to B instead walks a distance W1 = 22 km west of due south by angle θ1 = 15.0°. It then walks a distance W2 = 34 km due north. ...
February 9, 2014

Physics
Two trains, each having a speed of s, are headed at each other on the same straight track. A bird that can fly at speed 2s flies off the front of one train when they are d apart and heads directly for the other train. On reaching the other train it flies directly back to the ...
February 5, 2014

Physics
A particle starts from the origin at t = 0 and moves along the positive x axis. A graph of the velocity of the particle as a function of the time is shown in the figure; the v-axis scale is set by vs = 7.0 m/s. (a) What is the coordinate of the particle at t = 5.0 s? (b) What ...
February 5, 2014

Physics
Grains of fine California beach sand are approximately spheres with an average radius of 50 μm and are made of silicon dioxide, which has a density of 2.4 × 10^3 kg/m3. What mass of sand grains would have a total surface area (the total area of all the individual ...
January 30, 2014

Physics
A severe thunderstorm dumped 2.4 in of rain in 30 min on a town of area 35 km^2. What mass of water (in kg) fell on the town? One cubic meter of water has a mass of 103 kg.
January 30, 2014

Can someone plz help me?
4) The ratio of the number of tickets sold from Jane to Blake is 8:52. Simplify this to get 4/27. 10) Distance between starting line and first aid is 1.25 inches. Convert to miles: 2 inches=50 miles 1 inch=25 miles 1.25=1 mile and a quarter 50/4=12.5 25+12.5=37.5 miles from ...
November 26, 2013

Calculus
How can I get partial sums of a series on a TI 89 calculator?
November 26, 2013

Calculus
Calculate 20 terms for the sequence P0=-.5 and k=1.8, P0=.5 and k=2.8, and P0=.3 and k=1.8. Does the limit depend on the choice of P0? Does it depend on the choice of k?
November 25, 2013

Calculus
Solve the separable differential equation 10x−6ysqrt(x^2+1)dy/dx=0. with the initial condition y(0)=4.
November 18, 2013

Calculus
Determine whether the sequence is divergent or convergent. If it is convergent, evaluate its limit. A (sub n)=((4n-7)/(4n+9))
November 16, 2013

Calculus
Determine whether the sequence is divergent or convergent. a(sub n)=(−1)^n(sin(2/n))
November 16, 2013

Calculus
Solve the seperable differential equation 8yyŒ =x. Use the following initial condition: y(8)=4. Express x^2 in terms of y.
November 15, 2013

Calculus
Find the particular solution of the differential equation particular solution of the differential equation dy/dx=(x−7)e^(−2y).
November 15, 2013

Physics
A machine swings a mass of 1kg connected to a massless rope in a vertical circle so that the speed of them mass is constant at 8 m/s. The rope is 1.0 m long, and the center of the circle is fixed at all times. a) Find the acceleration of the mass with magnitude and direction ...
November 12, 2013

Physics
Massless ropes A, B, C are connected together as shown and support a mass of 100 kg. Rope A is horizontal and ties to the wall, rope b is tied to the ceiling and rope c is vertical. What are the tensions in the ropes.
November 12, 2013

Please help with Calculus??
Boxes are labeled as containing 500g of cereal. The machine filling the boxes produce weights that are normally distributed with standard deviation 12g. 1) Suppose a law states that no more than 5% of a manufacturer's cereal boxes can contain less than the stated weight of...
November 8, 2013

READING
VOCABULAY/CONTEXT CLUES WHAT DOES COMBUSTION MEAN? wHAT CLUES HELP YOU TO DETERMINE THE MEANING? wHAT IS A WAFT? WHAT CLUES HELP YOU TO DETERMINE THE MEANING? HOW DOE CONTEXT CLUES HELP YOU DTERFMINE THE MEANING OF DINGY?
November 5, 2013

Calculus
Awesome! I got .7603 and .142 as my answer. Thank you!
November 3, 2013

Calculus
According to the National Health Survey, the heights of adult males in the United States are normally distributed with mean 69.0 inches and standard deviation 2.8 inches. A. What is the probability that an adult male chosen at random is between 61 inches and 71 inches tall? B...
November 3, 2013

Calculus
A) Find the average value of f(x)=x^3-x+1 on the interval (0,2) B) Find c so that f(c)equals the average value
November 3, 2013

statistics
a sample of 50 women is obtained and their heights (in inches) and pulse rates (in beats per min) are measured. the linear correlation coefficient is 0.229 and the equation of the regression line y= 17.9 +0.870x where x represents hight. the mean of the 50 heights is 63.1 in ...
October 22, 2013

Calculus
x=7t−t^2,y=4t^(3/2) from the point (0,0) to the point (12,32), you'd have to compute integral b to a f(t)dt where a= b= f(t) =
October 22, 2013

Calculus Please Help?
A hawk flying at 25 m/s at an altitude of 150 m accidentally drops its prey. The parabolic trajectory of the falling prey is described parametrically by x=25t,y=150−4.9t^2 until it hits the ground. The variable x represents the horizontal distance traveled by the prey ...
October 22, 2013

Calculus
Determine whether the integral is divergent or convergent. If it is convergent, evaluate it. If it diverges to infinity, state your answer as INF. If it diverges to negative infinity, state your answer as MINF. If it diverges without being infinity or negative infinity, state ...
October 20, 2013

Calculus
A cable hangs between two poles of equal height and 40 feet apart. At a point on the ground directly under the cable and x feet from the point on the ground halfway between the poles the height of the cable in feet is h(x)=10+(0.4)(x^1.5). The cable weighs 18.2 pounds per ...
October 19, 2013

Math
What is the square root of 693 divided by the sum of pi and Avagadro's number
October 1, 2013

Calculus Please Help??
1. (-5x^2+10x-12)/(x-5)(x^2+4) 2. (-8x-28)/((x-2)(x+9)) I know how to integrate, I just don't know how to get an integral, after finding a,b,c, and from that point
September 27, 2013

Calculus Please Help??
Yes, I know how to get variables. I got b=-8, c=1, and a=2, but I don't know how to get an integral as an answer. I need help integrating 2 other problems I will post as well, if you can help me.
September 27, 2013

Calculus Please Help??
Evaluate the integral (3x^2-16x-19)/(x^3-4x^2-3x+18)
September 27, 2013

Calculus
Snow is falling vertically at a constant rate of 8.0 m/s. At what angle from the vertical do the snowflakes appear to be falling as viewed by the driver of a car traveling on a straight, level road with a speed of 50k.h?
September 26, 2013

Calculus
The position vector for a proton is initially r(with vector sign above it) =5.0i(with top)- 6.0j(with top) + 2.0k(with top) and then later is r vector = -2.0i(with top)+6.0j(with top)+ 2.0k (with top), all in meters. What is the proton's displacement vector, and to what ...
September 26, 2013

math
how much combined tax should be withheld from the paycheck of a married employee earning $910 per week and claiming three withholding allowances.
September 5, 2013

math
Mitch Anderson is a security guard. He earns $7.45 per hour for regular time up to 40 hours, time-and-a-half for overtime, and double time for the midnight shift. If Mitch worked 56 hours last week, including 4 hours on the midnight shift, how much were his gross earnings?
September 5, 2013

Maths
Approximately 1 out of every 4 tax returns contains some type of error. Maria has 260 tax return that she must review how many of these returns are likely to contain error Can someone please help me with this question
September 3, 2013

Business
Tribke Enterprises collected the following data from its financial reports for 2012.........
August 11, 2013

MATH
Create a graph of a function given the following information: The instantaneous rate of change at x = 2 is zero. The instantaneous rate of change at x = 3 is negative. The average rate of change on the interval 0 <x <4 is zero.
July 19, 2013

MATH
A frustrated office worker throws his laptop out of his business’s high-rise office building. The height, h, in meters of the laptop above the ground at t seconds can be modelled by h(t)=125=125-5t^2 Estimate the instantaneous rate at which the laptop hits the ground.
July 19, 2013

MATH
sorry the equation is h(t)=125=125-5t^2
July 19, 2013

MATH
A frustrated office worker throws his laptop out of his business’s high-rise office building. The height, h, in meters of the laptop above the ground at t seconds can be modelled by 2 h(t) 125 5t . Estimate the instantaneous rate at which the laptop hits the ground.
July 19, 2013

MATH
f(x)=3x+2 g(x)=-2x+1 a) Write an equation for ( f+ g)(x) b) Determine (f+g)(6) c) Determine (fg)(6) d) Determine the domain of (f/g)(x)
July 19, 2013

MATH
(1)/(sin(x)-cos(x))=cos(x)+sin(x)
July 19, 2013

MATH
in radians what would the .46 be?
July 19, 2013

MATH
2tan^2x-tanx-1=0 0<x<2pi •MATH - Steve, Thursday, July 18, 2013 at 11:48am (2tanx+1)(tanx-1) = 0 tanx = -1/2 or 1 ... Recall in which quadrants tanx is positive or negative ....................would x= 5pi/6,11pi/6,pi/4 and 5pi/4???
July 19, 2013

MATH
2tan^2x-tanx-1=0 0<x<2pi
July 18, 2013

MATH
A Ferris wheel completes one revolution every 90 s. The cars reach a maximum of 55 m above the ground and a minimum of 5 m above the ground. The height, h, in metres, above the ground can be modeled using a sine function, where t represents time, in seconds. Assume ride starts...
July 18, 2013

MATH
Explain the difference between cos^-1x and (cos x)^-1
July 15, 2013

MATH
Determine an equation of a sinusoidal function that has a maximum at (5, 4) and a minimum at (2, -10).
July 15, 2013

MATH
so ould it be sin pi.6 and tan pi/6??
July 15, 2013

MATH
solve for theda given 0<theda<2pi cos theta= - (sqrt 3)/ 2
July 15, 2013

MATH
Consider the expression logbase5 a=n a) For what value(s) of a will n be a positive number? b) For what value(s) of a will n be a negative number? c) For what value(s) of a will n be undefined?
July 15, 2013

MATH
For what value(s) of x does logbase2 (logbase3 (logbase4 x))=0
July 15, 2013

MATH
Consider the expression logbase5 a=n a) For what value(s) of a will n be a positive number? b) For what value(s) of a will n be a negative number? c) For what value(s) of a will n be undefined?
July 15, 2013

MATH
Given that x=logbase3 5 and y=logbase3 2 , rewrite logbase3 60 in terms of x and y.
July 15, 2013

Calculus
Evaluate the integral below by interpreting it in terms of areas. In other words, draw a picture of the region the integral represents, and find the area using geometry. ç6 −6 36−x^2dx
July 15, 2013

Calculus
For the function f described by the following table, estimate ç40 0 f(x)dx using the following. Enter each answer as a sum to show your work. 5 left rectangles 5 right rectangles 5 midpoint rectangles x 0 4 8 12 16 20 24 28 32 36 40 y 7 -46 -50 45 -7 -26 23 -3 18...
July 15, 2013

Calculus
Consider the function f(x)=(8)/(x^2)−(8)/(x^5) . Let F(x) be the antiderivative of f(x) with F(1)=0. Then F(2) equals ?
July 15, 2013

Calculus
Find the point on the line 7x+5y−2=0 which is closest to the point (−6,−2).
July 15, 2013

Calculus
A rancher wants to make a rectangular pen to house her animals. She will divide it up with 3 fences down the middle parallel to one side. If she has 14000 ft of fencing to work with, what are the dimensions of the pen of greatest area? Width = Length = What is the greatest ...
July 13, 2013

Calculus
Find the point on the line 7x+5y−2=0 which is closest to the point (−6,−2).
July 13, 2013

Please help with Calculus problem??
A particle moves with a fixed acceleration 3 m/s^2. If its initial velocity is s(0)=0: a) Find its velocity function. b) How long does it take for the particle to reach the velocity 14 m/s^2? c) Find the distance the particle traveled when its velocity reaches 14 m/s^2.
July 10, 2013

Calculus
Find the absolute maximum and the absolute minimum values of f(x)=x−7cos(x) on the interval [−ð,ð).
July 7, 2013

Calculus
Gravel is being dumped from a conveyor belt at a rate of 10 cubic feet per minute. It forms a pile in the shape of a right circular cone whose base diameter and height are always equal. How fast is the height of the pile increasing when the pile is 16 feet high? Recall that ...
July 5, 2013

Please help with Calc problem??
Sorry, I meant a television camera is positioned 2500 ft from the base of a rocket launching pad. The angle of elevation of the camera has to change at the correct rate in order to keep the rocket in sight. Also the mechanism for focusing the camera has to take into account ...
July 3, 2013

Please help with Calc problem??
The angle of elevation of the camera has to change at the correct rate in order to keep the rocket in sight. Also the mechanism for focusing the camera has to take into account the increasing distance from the camera to the rising rocket. Let's assume the rocket rises ...
July 3, 2013

Calculus
A television camera is positioned 2500 ft from the base of a rocket launching pad. The angle of elevation of the camera has to change at the correct rate in order to keep the rocket in sight. Also the mechanism for focusing the camera has to take into account the increasing ...
July 1, 2013

Calculus
Two cars start moving from the same point. One travels south at 60 mph and the other travels west at 25 mph. At what rate is the distance between the cars increasing 2 hours later? Let x = the distance covered by the south traveling car. Let y = the distance covered by the ...
June 28, 2013

Calculus
A television camera is positioned 2500 ft from the base of a rocket launching pad. The angle of elevation of the camera has to change at the correct rate in order to keep the rocket in sight. Also the mechanism for focusing the camera has to take into account the increasing ...
June 28, 2013

Calculus
Let y=e^(x/9). a) Find the differential dy. dy = b) Evaluate dy if x=0 and dx=−0.03. dy =
June 26, 2013

Math
How would you do this problem. What is the growth rate of the stock with a $3.00 expected dividend and a $20.60 price with 15%required return?
June 21, 2013

math
R. H. Bruskin Associates Market Research found that 30% of Americans do not think that having a college education is important to succeed in the business world. If a random sample of five Americans is s selected, find these probabilities. (a) Exactly two people will agree with...
June 20, 2013

Calculus
The motion of a spring that is subject to dampening (such as a car's shock absorber)is often modeled by the product of an exponential function and a sine or cosine function. Suppose the equation of motion for a point on such a spring is s(t)=3∗e^(−2t)sin(3ð...
June 18, 2013

Calculus
Find the outside and inside functions of the following to find their derivatives: 1) sqrt(2x+9) 2) cos(cos(x)) 3) tan(x) I already know how to find their derivatives I'm just not exactly sure what parts of the chain rule equation would be considered the outside and inside.
June 18, 2013

Calculus
For what values of x with 0¡Üx¡Ü2¦Ð does the graph of f(x)=x+4sin(x) have a horizontal tangent?
June 18, 2013

Calculus
Find the equation of the tangent line to the curve y=2tan(x) at the point (pi/4,2).
June 18, 2013

Calculus
Sketch a graph of the parabola y=x^2+3. On the same graph, plot the point (0,−6). Note there are two tangent lines of y=x2+3 that pass through the point (0,−6). The tangent line of the parabola y=x^2+3 at the point (a,a^2+3) passes through the point (0,−6) ...
June 17, 2013

Pages: 1 | 2 | 3 | 4 | Next>>

Search
Members