Thursday
August 28, 2014

Posts by Jackie


Total # Posts: 769

Physics
A block of mass 20g sits at rest on a plate that is at the top of the fluid on one side of a u-tube as shown in figure P10.38. The u tube contains two different fluids with densities p1= 1000 kg/m^3 and p2= 600 kg/m^3 and has a cross sectional area of A= 5.0 x10^-4 m^2. If the...
June 27, 2012

Algebra
a gallon of paint covers 350 square feet, how many do I have to buy to cover 560,444 square feet?
June 27, 2012

math
A locker combination has three nonzero digits, and digits cannot be repeated. If the first digit is 3, what is the probability that the next digit is odd?
June 20, 2012

Economics
An increase in the tax rates on the underground will have no effect on tax revenue since 0 x tax rate = 0. Since the underground is not reported or illegal. However, underground goods and services will now be cheaper since the other goods and services will be more expensive ...
June 19, 2012

Precalculus
You have a total of 820 feet of fencing to enclose a large retangular larea and divide it into four smaller pens of the same dimensions. The fencing used to divide the large pen must be parallel to the same side of the large rectangle. Maximize the total rectangular area (...
June 19, 2012

finance
how do we end up with salvage value if the item is depreciated the cost of the item either over a period of years or all in one year? How does salvage value work?
June 15, 2012

Algebra 2
Log27+log27(x+8) = 2/3
June 13, 2012

Algebra 2
log5 (log3³)
June 13, 2012

Algebra 2
Log² x + log² 3 = 1
June 13, 2012

Algebra 2
log² 16 = x
June 13, 2012

Physics Equations of Motion
90.5x10^3 doesn't sound reasonable since it's a ratio but i went ahead and tried it and it didn't work i believe you have to combine the equations of motion i'm just not sure how to do it!
June 7, 2012

Physics Equations of Motion
Along a straight road through town, there are three speed-limit signs. They occur in the following order: 66 , 31 , and 19 mi/h, with the 31 -mi/h sign located midway between the other two. Obeying these speed limits, the smallest possible time tA that a driver can spend on ...
June 7, 2012

Calculus AP
oh 4/2 is 2. ok thanks
June 4, 2012

Calculus AP
i mean my answer is -1/(x+1)
June 4, 2012

Calculus AP
i wanna KNOW IF im DOING RIGHT. Evaluate the difference quotient for the given function. Simplify your answer. f(x)=x+3/x+1, [f(x)-f(1)]/(x-1) simplify my answer: [(x+3)/(x+1) - (1+3)/(1+1)]/(x-1) = [x+3/x+1 - 4/2] / (x-1) = [2(x+3)-4(x+1)/2(x+1)] / (x-1) = [2x+6-4x-4/2(x+1...
June 4, 2012

Algebra 2
9x²+4y²-18x+16y-11=0
June 1, 2012

Algebra 2
x²+6x-4y+1=0
June 1, 2012

math
an account which pays 14% compounded quarterly, what is the effective rate of yield?
May 23, 2012

Health, Safety ,and Nutrition
Flexability
April 28, 2012

Statistics/Research
Please do not respond to this question
April 25, 2012

Calculus AP
5.2 The Natural logarithmic function Differentiate the function problem # 13: f(x)= sqrt(x) Inx
April 18, 2012

calculus
a projectile is fired upward from the ground to reach 64 feet. What is the velocity when it is 48 feet above the ground
April 17, 2012

Math
Kirk has 25 marbles and 14 seashells. What information is needed to find the number of marbles that are NOT cat's eyes?
April 16, 2012

physics
A ball is thrown upward with an initial velocity of 6.0m/s by someone on top of the building 34m tall who is leaning over the edge so that the ball will not strike the building on the return trip. (a) How far above the ground will the ball be at the end of 1.0s? (b) What is ...
April 10, 2012

stats
The per capita consumption of coffee by people in the United States in a recent year was normally distributed, with a mean of 24.2 gallons and a standard deviation of 8.1 gallons. What proportion of people in the U.S. drink more than 20 gallons of coffee a year?
April 6, 2012

Math
Jan, Mya, and Sara ran a total of 64 miles. Jan and Maya ran the same amount and Sara ran 8 less then Maya. How many miles did Sara run?
April 4, 2012

Statistics
5.54134
March 20, 2012

math
How could you use the product of 1/5x 40 to find the product of 4/5 x 40?
March 19, 2012

physics
How far does a point on the circumference travel if the wheel is rotated through an angle of 26.2 rev?
March 9, 2012

Physics
How far (path length) does a point on the circumference travel if the wheel is rotated through an angle of 26.2°?
March 9, 2012

physics
A wheel has a radius of 4.56 m. How far (path length) does a point on the circumference travel if the wheel is rotated through an angle of 26.2°?
March 8, 2012

physics
A horizontal circular platform (m = 108.1 kg, r = 3.25m) rotates about a frictionless vertical axle. A student (m = 85.3kg) walks slowly from the rim of the platform toward the center. The angular velocity, omega, of the system is 2.5 rad/s when the student is at the rim. Find...
March 8, 2012

Physics
A figure skater is spinning with an initial angular speed of 6.9rad/s. She then pulls her arms in, reducing her moment of inertia to 0.38 times its original value. What is her angular speed after pulling in her arms?
March 8, 2012

Physics
A CD has a mass of 17.0 g and a radius of 5.98 cm. When inserted into a player, the CD starts from rest and accelerates to an angular velocity of 19.1 rad/s in 0.744 s. Assuming the CD is a uniform solid disk, determine the net torque acting on it.
March 8, 2012

Geometry
An A-frame house is 40 feet high and 30 feet wide. Find the angle that the roof makes with the floor. Round the angle nearest degree.
March 6, 2012

Geometry
Guy wires 80 feet long support a 65 foot tall telephone pole. To the nearest degree, what angle will the wires make with the ground?
March 5, 2012

physics
A mercury barometer reads 744 mm on the roof of a building and 769 mm on the ground. Assuming a constant value of 1.29 kg/m3 for the density of air, determine the height of the building.
March 5, 2012

physics
A jet of water squirts out horizontally from a hole near the bottom of the tank, as seen in the figure below. Assume that y = 1.19 m and x = 0.544 m. What is the speed of the water coming out of the hole? The hole has a diameter of 3.06 mm. What is the height, h, of the water ...
March 5, 2012

Physics
A mercury barometer reads 744 mm on the roof of a building and 769 mm on the ground. Assuming a constant value of 1.29 kg/m3 for the density of air, determine the height of the building.
March 5, 2012

Stats
When sampling is done for the proportion of defective items in a large shipment, where the population proportion is 0.18 and the sample size is 200, what is the probability that the sample proportion will be at least 0.20
March 4, 2012

math
10
March 1, 2012

teen alcohol abuse
It is a small topic and I am supose to write a gobal issue and I picked that. *Writeacher*
March 1, 2012

teen alcohol abuse
I am doing a research outline for it and I have all my notes and everything but I do not know where I should put my infor mation on my paper even though I have a guide line. (English is my worst subject) Here it is this is all I have help please .... Research Paper Outline I. ...
March 1, 2012

Physics
A jet of water squirts out horizontally from a hole near the bottom of the tank, Assume that y = 1.19 m and x = 0.544 m. What is the speed of the water coming out of the hole?
March 1, 2012

poetry
who are the "fools" mentioned in the poem "Trees"; poets, gods, trees, robins
February 29, 2012

physics
Can someone please help me solve this: An 7.74g bullet is fired into a 320g block that is initially at rest at the edge of a frictionless table of height h = 1.07 m The bullet remains in the block, and after the impact the block lands d = 2.07 m from the bottom of the table. A...
February 27, 2012

algebra
A shipping clerk wishes to determine the weights of each of the 4 boxes. Each box weighs a different integer amount less than 70 kg. Unfortunately, the only scales available measure weights in excess of 70 kg. The clerk therefore decides to weigh the boxes in pairs so that ...
February 23, 2012

Calculus
If it takes 90N to stretch a spring 1/2 m beyond equilibrium, use an integral to find how much Work it takes to stretch the spring 5m beyond equilibrium
February 20, 2012

Calculus
integrate (27x -9x^2)/sqrt(x^3 +9)
February 20, 2012

math
find the whole-number possibilities for the lengths of the bases of a trapezoid with a height of 1m and an area of 3m squared. Explain how you found your answer
February 15, 2012

Math
The hourly operating cost of an airplane, which seats up to 405 passengers, is estimated to be $5,500. If an airline charges each passenger a fare of $100 per hour of flight, find the hourly profit P it earns operating the airplane as a function of the number of passengers x...
February 9, 2012

Math
The hourly operating cost of an airplane, which seats up to 405 passengers, is estimated to be $5,500. If an airline charges each passenger a fare of $100 per hour of flight, find the hourly profit P it earns operating the airplane as a function of the number of passengers x...
February 9, 2012

Perimeter
A rectangle has a perimeter of 12m. If each side is a whole number of meters, what are the possible dimensions for the length and width?
February 8, 2012

algebra
what is the expression that best represents the side of a square with the area of 100x^4y^8
February 6, 2012

accounting
Recently Boeing has maintained a cash balance of over $6 billion. At an annual inflation rate of about 2 percent, does cash have more or less purchasing power at the end of a given year than at the beginning? By how much? Is such a gain or loss reflected on the company’s ...
February 3, 2012

algebra
Use scientific notation to divide the following two numbers. Express the answer using scientific notation; retain at least three decimal places. (6.2 · 10^7) / (4.15 · 10^3)
January 29, 2012

ALGEBRA
A chemist is asked to make 10 liters of a a35% solution. She has only a 10% solution and a 50% solution to work with. how much of each solution must she mix to ge 10 liters of the 35% solution?
January 28, 2012

Health
Who all is held responsible for the completeness of medical records and what are some reasons that cause them to be incomplete?
January 26, 2012

intermediate algebra
need the equation for this problem. Mike invested $706 for one year. He invested part of it at 5% and the rest at 3% at the end of the year he earned $28.00 in interest. How much did mike invest at each rate of interest
January 19, 2012

chemistry
Use the periodic table to identify what type of chemical bond is involved in each of these compounds: NaF,NO2, CBr4, and MgS. Explain your reasoning.
January 18, 2012

Chemistry
So are u implying that the of moles of O2 is wrong? How do u calculate molar mass?
January 16, 2012

Chemistry
What is the volume of 128 g of Oxygen at STP?... here's my work... O=16 128/16= 8 moles 8(22.4) = 179.2 L Where did i go wrong?
January 16, 2012

Chemistry
So do u multiply 12.044 by 2 again to get 2 moles?
January 16, 2012

Chemistry
Given 80g of Calcium reacts with Fluorine at STP, how many atoms of Fluorine are consumed? Heres the formula: Ca (s) + F(subscript 2) --> CaF(subscript 2) How do i do this? Thanks! Jackie
January 16, 2012

physical science
Write a brief essay on the topic of volcanic activity and climate change. Consider such questions as whether there is there a link between volcanic eruption and climate change and what the relationship between the two may be. Research and find a minimum of two resources to ...
January 11, 2012

Algebra 1
5x/(x^2 – 25)
January 6, 2012

C Programming
I need help creating a program that uses a menu with options to enter student information (name, ID, GPA), print student information, or quit the program. Use data files and FILE pointers to store and print information entered.
January 2, 2012

Math
John delivers newspapers he makes $5 the first week and $2 are added to his pay each week he delivers papers. Which expression could be used to find out how much he would make in a given week, w, after the first week? a) 2w+5 b) 2(w-2)+5 c) 2(w-1)+5 d) 5w-2
December 19, 2011

Chemistry
Consider the reaction: 3Ba(s)+N2(g)--->Ba3N2(s) 1)How many moles of barium metal react to produce 0.190 mol of barium nitride? 2)How many moles of nitrogen gas react?
December 14, 2011

English
If Virgil and Aeschylus had a conversation about women, how would it go based on the stories Aeneid and Agamemnon?
December 14, 2011

Physics, Kinematics
Nevermind, you just accidentally switched the velocity and time. It's (1/2)(15.1+25.8)*(28.7) and (1/2)(25.8)*37.1. Thank you so much for your help! I can't believe I didn't see that before.
December 1, 2011

Physics, Kinematics
That isn't correct. Any other thoughts on this problem?
December 1, 2011

Physics, Kinematics
You drive with a constant speed of 15.1 m/s for 23.4 s. You then accelerate for 28.7 s to a speed of 25.8 m/s. You then slow to a stop in 37.1 s. How far have you traveled? I've tried dividing this into 3 parts. 1st- constant speed 15.1m/s*23.4s=353.34 m 2nd-accelerating I...
December 1, 2011

Physics
Thank you so much, you guessed right without the figure. I really appreciate the help!
December 1, 2011

Physics
A popular carnival ride consists of seats attached to a central disk through cables. The passengers travel in uniform circular motion. As shown in the figure, the radius of the central disk is R0 = 3.00 m, and the length of the cable is L = 1.43 m. The mass of one of the ...
December 1, 2011

math
Ed Long promised to pay his son $400 semiannually for 12 years. Assume Ed can invest his money at 6% in an ordinary annunity. How much must Ed invest to pay his son $400 semiannually for 12 years? 24 periods, 3% (Table 13.2)
November 16, 2011

math
You borrow $90 from Grandma. You pay back $15 a week. Write an equation in standard form that represents the amount owed(y) after x weeks.
November 15, 2011

3rd grade math
There is a pattern. The owner part goes 1-2-1-2-1-2-1 so the next owner would be 2. The pets go up by one every 2 people so it would be 3. 2 owners, 3 pets each
November 15, 2011

Shirley English 3 rd grad
My daughter is working on Fragments and Correcting Run ON Sentences by SCV, SCS, and SS and she did not bring home her book. I have no idea what SCV and SCS and SS means! Can you please help?
November 10, 2011

Stats
I'm having some trouble with a stats portion of an animal behavior lab. We have to do chi-sqaure tests to test 3 hypothesis, which are 1) percent prey captured will decline as prey group size increases 2) percent successful hunts will decline as prey group size increases 3...
November 3, 2011

Algebra
Write the slope-intercept equation for the line that passes through (-3,-15)and is perpendicular to -6x+8y=3
November 2, 2011

math
what is the perimeter of triangle 8746
October 26, 2011

Chemistry
for a) there is a 1:1 ratio. The bolts are the limiting reactant (which means you will run out of them before you use up all of the other) therefore you can only have 75 NB molecules. b) for every N2B you have to have 2 nuts to every 1 bolt which is a 2:1 ratio so you divide ...
October 24, 2011

Chemistry please help :)
A 1.10 sample of dry ice is added to a 745 mL flask containing nitrogen gas at a temperature of 25.0 degrees C and a pressure of 735 mm Hg . The dry ice is allowed to sublime (convert from solid to gas) and the mixture is allowed to return to 25.0 degrees C. What is the total ...
October 24, 2011

Chemistry
The balanced equation is Mg+2HCl->H2+MgCl2 but I can't recall how to find the moles. Sorry, hope I helped a little!
October 24, 2011

Physics
After fixing a flat tire on a bicycle you give the wheel a spin. Its initial angular speed was 7.35 rad/s and it rotated 15.0 revolutions before coming to rest. What was the average angular acceleration? For what length of time did the wheel rotate?
October 23, 2011

Math
Prove that if "a" is a unit in a ring R with unity, then "a" is not a zero divisor in R.
October 20, 2011

statistics
what is a t-test
October 17, 2011

math
If H is a subgroup of G, and K is a normal subgroup of G, prove that: HK = KH
October 14, 2011

math
Thank you very much!!!!!!!
October 11, 2011

math
Show that Sn is non-abelian for n>=3
October 11, 2011

Geometry
One endpoint of a line segment is (8,-1). The point (5,-2) is one-third of the way from that endpoint to the other endpoint. Find the other endpoint.
October 1, 2011

geometry
Find the point that is one-fourth of the way from (2,4) to (10,8).
October 1, 2011

Sociology
I am having some trouble with a sociology assignment concerning research methods. I know this is not a subject covered on this site, but I do not know of any sites for help in this area. If you know of any or have knowledge in this area, then your help would be greatly ...
September 29, 2011

MATH
commutativity
September 29, 2011

College Abstract Algebra
If H is a subgroup of G and K is a normal subgroup of G,prove that HK = KH
September 29, 2011

math
Okay so the bee can flap its wings 200 times in one second. Therefore, since there are 60 seconds in one minute, we can multiply 200 * 60 which will give us the amount of times in one minute, whihc is 12,000. Next, we multiply 12,000 and 1,000 (because we want to know how many...
September 29, 2011

Math
7 + 2X - 6 +5X Combine like terms...and you get: 7X + 1
September 29, 2011

Chemistry
Find the volume of 0.110 M hydrochloric acid necessary to react completely with 1.54 Al(OH)3. Please explain how to do this.
September 28, 2011

Science (Hypothesis)
The null hypothesis is the hypothesis of no difference, while the hypothesis is what you expect to occur, right? So, what if what you expect to occur is the null? Can you do this? For example, Null: Mice prefer areas along the wall and areas along the edges equally. Hypothesis...
September 20, 2011

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