Tuesday

March 31, 2015

March 31, 2015

Total # Posts: 348

**algebra**

I asked a question and it was answered by Steve. He had the numbers wrong. The problem should be sqrt of 18 over (sqrt of 8)-3. not sqrt of 18 -3. I got 2+sqrt of 8. Is it correct?
*March 25, 2015*

**algebra**

how do you simplify (sqrt18)over(sqrt8)-3? And (4-3sqrt2)squared? I tried but get some unreal answer. thanks in advance.
*March 24, 2015*

**Chemistry**

Titration of Na2CO3 with HCl. (pKa1(H2CO3) = 6.352, pKa2(H2CO3) = 10.329) . Calculate the pH at each of the following volumes of 0.20 M HCl added to 20.00 mL of 0.10 M Na2CO3. I figured out everything except for adding 20.00 ml of 0.20M HCL. Please help asap.
*March 23, 2015*

**algebra**

how do you simplify 3j cubed - 51j squared + 210j? I have the answer as j(j(3j-51) = 210 or is it 3j ((j squared -17j + 70)? thank you for your assistance.
*March 19, 2015*

**Organizing, analyzing and interpreting Data (scien**

the actual volume of a ligquid is 24.5 mL. which of the sets of data indicates both accuracy and precison?
*March 12, 2015*

**Calculus**

What would an example of a logarithmic function that contains a radical within it and a quotient within it where you would need to use chain rule and quotient rule to take derivative look like? How would taking the derivative of the function in its original form look different...
*February 12, 2015*

**Calculus**

What would an example of a logarithmic function that contains two trig functions within it where you would need to use chain rule and product rule to take derivative look like? How would taking the derivative of the function in its original form look different when using log ...
*February 12, 2015*

**English 2**

That aids digestion is really true.
*February 4, 2015*

**English 2**

Water that aids digestion is really true.Identify the function of the noun clause.
*February 4, 2015*

**Math**

Thank you so much Yrafaj!!! Robin
*February 3, 2015*

**Math**

No, don't think what I wrote before is correct.
*February 3, 2015*

**Math**

So if 50 is half of what Tyler had then he had 100. Grace had 3 times Tyler so that would be 300. She ate 50 so she has 250 left (and a very bad stomach ache). If this is even correct is there some algebraic way to show the work??? This is just for a 4th grader and I have no ...
*February 3, 2015*

**Math**

Can't get started on this for my granddaughter: Grace had 3 times as many berries as Tyler. After Grace eats 50 berries she has half as many berries as Tyler. How many berries does Grace have left.
*February 3, 2015*

**math**

Thanks Ms. Sue.
*January 28, 2015*

**math**

I have 23 hundreds, 47 tens, 5 ones, 8 tenths and 10 hundredths. What number am I. We got the numbers to the left of the decimal - 2775 but to the right is it .81 or .18 or .9 as 10 hundredths is the same as 1 tenth so add 8 tenths and 1 tenth together? Thanks! Robin
*January 28, 2015*

**Math**

Great thanks Rose.
*January 27, 2015*

**Math**

Of the coins in Tricia's bank, 5/7 are quarters. If Tricia has 95 quarters in her bank, how many coins does she have in all. Is this correct? 5/7*x = 95 (7/5)(5/7)*x = 95 x= 95*7/5 95x7 = 665 665/5=133 x=133 Thanks from a Grandma helping w/4th grade math
*January 27, 2015*

**Math**

40+(40+13)=93 40+53=93
*January 12, 2015*

**Math**

Thanks!
*January 12, 2015*

**Math**

At a tournament, 2 different games went on for a total of 93 mins. If 1 game took 13 mins longer than the other, how long did it take to complete each game.
*January 12, 2015*

**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 8yyŒ =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*