Friday
July 29, 2016

Posts by Donna

Total # Posts: 481

chemistry
How would you prepare 3.5 L of a 0.9M solution of KCl? A. Add 23 g of KCl to a 3.5 L container; then add enough water to dissolve the KCl and fill the container to the 3.5 L mark. B. Add 233 g of KCl to a 3.5 L container; then add enough water to dissolve the KCl and fill the...
June 13, 2016

chemistry
. Which of the following is not a way an atom can achieve stability?
June 8, 2016

Math
Please this problem to me There is a stack of 8 cards from 1-8 suppose we select a card randomly from the stack, replace it, then randomly select another card What is the probability the first card is a even number and the second card is greater than 6 write answer in simplest...
May 11, 2016

physics
A 5 kg block is being pulled on a frictionless surface by a string at an angle of 30o to the horizontal. The tension in the string is 30 N. What is the total work done on the block as it moves a distance of 10 m? Thank you!
March 21, 2016

Physics
A 5kg block is being pulled on a horizontal frictionless surface. The tension in the string is 30N. If the block has an initial speed of 2m/s, what is the speed after moving 10 meters? Please help!Thanks
March 21, 2016

Physics
A 5kg block is being pulled on a horizontal frictionless surface. The tension in the string is 30N. If the block has an initial speed of 2m/s, what is the speed after moving 10 meters? Please help!Thanks
March 20, 2016

science
If I mix 300g of reactant A with 100g of reactant B in a close system how much will it weigh
March 13, 2016

math...finding cubic feet
What is the cubic feet of a cylinder that's 12 3/4 inches wide and 16 inches tall?
January 27, 2016

Math
Sarah and Noah work at Read On Bookstore and get paid the same hourly wage
January 6, 2016

statistics
The pie chart below shows how the total annual income for a certain family is spent. If the total annual income is , what amount is budgeted for Savings and Insurance combined?
January 4, 2016

Math
Hi Hannah, Since this question is part of a graded assignment, you should not be asking for help online.
December 10, 2015

algebra
Do your own work...This is for a graded assignment.
December 7, 2015

Algebra
3 girls whose ages total 36. Sue is 1/3 Jill's age. Sue is 4 times as old as Jane. What are their individual ages?
November 16, 2015

DMMS
Chemistry What characteristics are shared by all alkali metals and alkaline earth metals? A They conduct electricity very well B They are strong and shiny C They form alkaline solutions when mixed with water D They do not react with water at all
October 22, 2015

MATH
pAYTON'S WEIGHT IS 60 LBS. sHE IS 5 TIMES AS HEAVY AS HER YOUNGEST BROTHER SETH. wHAT IS SETH'S WEIGHT?
October 14, 2015

history
the Continental Army and blank were no match against the large number of British soldiers who landed on blank
October 12, 2015

statistics
A student takes an exam containing 14 multiple choice questions. The probability of choosing a correct answer by knowledgeable guessing is 0.5. At least 9 correct answers are required to pass. If the student makes knowledgeable guesses, what is the probability that he will ...
October 8, 2015

hydraulics
The surface of the large piston is 4m2. What will the force (F2) be that is exerted by the large piston?
September 9, 2015

4th Grade Math
What does 5*6 mean?
September 8, 2015

Algebra
Maria needs $2.45 to buy a magazine. The only money she has is a jar of nickels and dimes. Write an equation in standard form for the different amounts of nickels x and dimes y she could use. I tried .05x +.2y+2.35 but could not figure it out
September 2, 2015

Algebra
write an equation for a rational function that has a vertical asymptote of -4, a horizontal asymptote of 3, and vertically shrinks the graph by a factor of 5 (compared to the graph of y=1/x). So far I have Y=3x/x+4 but I can't figure out how to shrink the graph by 5.
August 10, 2015

Maths I NEED AN ANSWER ! THE 6 IS ALL I KNOW!!!
Angel is thinking of a number. All its digit are even numbers. The sum of its digit is 18. The digit 6 stands for sixty. The smallest of the three digits is in the tenths place. The greatest of the three digit is in the ones place. What number is Angel thinking of? ____6___
August 8, 2015

Managerial Finance II
Ten rights are necessary to purchase one share of Fogel stock at $54. A right sells for a $6. The ex-rights value of Fogel stock is...?
July 19, 2015

Geometry-Reiny
Thank you! A, B, C and D are all on the circle. If the circle was a clock, point A would be around 11:00, B is around 9, C is around 6 and D is around 4 ... P is in the middle. A straight line runs vertical to the circle touching the circle at point B. E is the point at the ...
June 9, 2015

Geometry
Max is building a spherical model of earth. He is building his model using 2-inch long pieces of wood to construct the radius. The first time he tries to build the model, he uses 3 of the 2-inch pieces of wood end-to-end to make the radius of the model. A.) What is the volume ...
June 9, 2015

Geometry
A scientist is plotting the circular path of a particle on a coordinate plane for a lab experiment. The scientist knows the path is a perfect circle and that the particle starts at ordered pair (-5, -11). When the particle is halfway around the circle, the particle is at ...
June 9, 2015

Geometry
Trying to help my Autistic child with geometry. Need a simple step by step explanation and answer please. In this open ended question, find each item and include an explanation of how you found each one. Find arc AD. Find angle APD. If arc BC=100 degrees, find angle EBC. Find ...
June 9, 2015

statistics
A daily lottery is conducted in which two winning numbers are selected out of 100 numbers. How many different combinations of winning numbers are possible?
June 9, 2015

Chemistry
Calculate the volume of solution of 3.6 M NH4CI needed to prepare 350.0ml of 1.24 M NH4CI. How many grams of ammonium chloride are in the solution you created in the above problem.
June 7, 2015

Chemistry
How many moles of potassium sulfate would you need to prepare 1200 grams of 5.0% sulfate (m/m) solution? Calculate the volume of solution of 3.6 NH4CI needed to prepare 350.0ml of 1.24 M NH4CI. How many grams of ammonium chloride are in the solution you created in the above ...
June 7, 2015

Great Valley
How many moles of potassium sulfate would you need to prepare 1200 grams of 5.0% sulfate (m/m) solution? Calculate the volume of solution of 3.6 NH4CI needed to prepare 350.0ml of 1.24 M NH4CI. How many grams of ammonium chloride are in the solution you created in the above ...
June 7, 2015

child care development
I have two questions that I need checked. Toddlers are incapable of sharing, even for short periods of time. (true or false) I chose false Secondly,tummy time is a supervised timewhile the infant is awake, during which the infant is ladi on his or her stomeach to play, which ...
June 6, 2015

finance
You buy one share of stock at $30.00, hold it for one year and sell it for $40. IF you receive $2.50 in dividends, what is your return on investment?
May 17, 2015

chemistry
Suppose 50mL of 8.4 x 10^-7 M Pb(NO3)2 (aq) is mixed with 200 mL of 9.7 x 10 ^-4 M Na2CO3 (aq). Calculate Q and determine whether a ppt of PbCO3(s) will form.
April 11, 2015

Physics
Two capacitors (c1 = 19 and c2 = 8 μF) are charged in series by a 14 V battery. Find the time constant of the charging circuit. (5 ohms)
February 16, 2015

Geometry
Al's garden is 18 feet long and 30 feet wide he wants to put a fence post that same distance apart along both the length and the width of the fence what is the greatest distance he can put apart the fence post
February 5, 2015

Math
Draw a velocity vector to represent the following (1cm represents 10km/h): a) a girl running around a circular track travelling at 15km/h heading due east. In the solutions, it shows it heading south, why is that?
February 3, 2015

Chemistry
Calculate the mass of Al2(SO4)3 produced when 4.26kg of Al(NO3)3 is added to an excess of K2SO4.
January 9, 2015

algebra
A field goal is 3 points and the extra point after a touchdown is 1 point. a player made 21 field goals and extra point kicks for 49 points. Find the number of field goals and extra points that he made. FG= x extra point =y =49 x+y=49 did i set up the equation correctly
December 18, 2014

finance math
Meg's pension plan is an annuity with a guaranteed return of 7% interest per year (compounded annually). She would like to retire with a pension of $30000 per annum for 15 years. If she works 31 years before retiring, how much money must she and her employer deposit per ...
November 12, 2014

Statistics
Where can I find the ti83 plus input functions for beginning statistics course
October 30, 2014

math
thanks...i figured it out
October 5, 2014

math
I am looking for the balance owed and what was paid.
October 5, 2014

math
If I borrowed $15000 in April 2008 at 6% interest and have paid $150 per month since then, how much have I paid and how much do I owe?
October 5, 2014

marketing and research.
I am interested in assessing the influence of children on a family's purchasing decision at a grocery store. How would you investigate this problem by communication and observation?
September 29, 2014

math
Which is least to greatest. 1 1/4 in, -1 3/10 in, 2.5cm, -3.4cm?
September 17, 2014

physocology
Race usually refers to the biological characteristics that distinguish one group from another is this true or false
September 2, 2014

ctc
The unconscious memories that can surface to reveal hidden meaning or intentions describes which is the correct answer the psychodynamic perspective the psychosocial model cognitive development ecological systems theory evolutionary approaches
September 2, 2014

Math
write an algebraic expression for 43 more than t 43 + t
August 28, 2014

statistics
A company director took a sample of salaries of 13 employees in a big school during a certain time. she divided the wages into three groups according to the different jobs: teachers, assistants and coordinators as displayed in the table below. She wanted to find out whether or...
May 27, 2014

tax
I too am having a hard time with the Marion drives 20 miles a day to 2 jobs for 125 days of the year. What is his deductible using the standard mileage rate assuming he incurred ratably throughout the year. I take 125 x 20 x 0.51 and come up with 1275.
April 30, 2014

physics
Two charged bodies exert a force of 0.225 N on each other. If they are moved so that they are one-third as far apart, what force is exerted?
March 23, 2014

Grade 12 Math Please help!!
Please can anyone answer this which I have posted previously? Anyone with knowledge of this area of maths? Thanks in anticipation. :) Formula given: The decibel (dB) scale for measuring loudness, d, is given by the formula d = 10 log base ten(I X 12 to the power of 12) where I...
February 17, 2014

Math
Formula given: The decibel (dB) scale for measuring loudness, d, is given by the formula d = 10 log base ten(I X 12 to the power of 12) where I is the intensity of sound in watts per square metre. a) Find the number of decibels of sound produced by a jet engine at a distance ...
February 16, 2014

Maths
Find the number of decibels of sound produced by a jet engine at a distance of 50 metres if the intensity is 10 watts per square metre. This time I'll post the given formula too. Sorry to leave it out before! The dB scale for measuring loudness, d, is given by the formula...
February 15, 2014

Maths
Find the number of decibels of sound produced by a jet engine at a distance of 50 metres if the intensity is 10 watts per square metre.
February 15, 2014

special ed.
Some years back i made each letter in the alphabet on index.....i folded the cards and then did cutting......I forget how to do it .....can you help ?
February 11, 2014

Engl
I believe that is what the teacher wants, the main clause. Thank you very much.
January 28, 2014

Engl
Simple subject and predicate? Officals hope the new shopping mall will increase pedestrian traffic and lure shoppers to the downtown area. ss...officals sp...hope
January 28, 2014

Engl.
Simple subject and predicate? The customs officals planned to seize a huge shipment of heroin when it arrived. SS...officals sp...planned
January 28, 2014

Engl.
Simple subject and predicate? The villagers were afraid the volcano would erupt. simple subject....villagers simple predicate...were
January 28, 2014

English
I believe that the simple predicate is "had" in the main clause. In the subordinate clause... "was cheating". What about "to banish"? is this an infinitive? Or an infinitive used as a direct object?
January 28, 2014

English
Simple predicate? We had to banish Mel from the game because he was cheating.
January 28, 2014

physics
A metal sphere hangs from a string and has 2 kg of mass. The sphere has a charge of +7.1 µC. A uniform electric field is turned on and directed to the right.
January 16, 2014

physics
A 0.67-kg metal sphere oscillates at the end of a vertical spring. As the spring stretches from 0.10 to 0.21 m (relative to its unstrained length), the speed of the sphere decreases from 5.35 to 4.55 m/s. What is the spring constant of the spring? (The sphere hangs from the ...
December 9, 2013

physics
A 0.67-kg metal sphere oscillates at the end of a vertical spring. As the spring stretches from 0.10 to 0.21 m (relative to its unstrained length), the speed of the sphere decreases from 5.35 to 4.55 m/s. What is the spring constant of the spring? (The sphere hangs from the ...
December 5, 2013

physics
A tray is moved horizontally back and forth in simple harmonic motion at a frequency of f = 1.86 Hz. On this tray is an empty cup. Obtain the coefficient of static friction between the tray and the cup, given that the cup begins slipping when the amplitude of the motion is 5....
November 26, 2013

physics
A spring stretches by 0.018 m when a 3.6-kg object is suspended from its end. How much mass should be attached to this spring so that its frequency of vibration is f = 2.9 Hz?
November 26, 2013

physics
The shock absorbers in the suspension system of a car are in such bad shape that they have no effect on the behavior of the springs attached to the axles. Each of the identical springs attached to the front axle supports 303 kg. A person pushes down on the middle of the front ...
November 26, 2013

physics
A 30.0-kg block is resting on a flat horizontal table. On top of this block is resting a 15.0-kg block, to which a horizontal spring is attached, as the drawing illustrates. The spring constant of the spring is 340 N/m. The coefficient of kinetic friction between the lower ...
November 26, 2013

physics
To measure the static friction coefficient between a 1.6-kg block and a vertical wall, the setup shown in the drawing is used. A spring (spring constant = 400 N/m) is attached to the block. Someone pushes on the end of the spring in a direction perpendicular to the wall until ...
November 26, 2013

Liquid capacity of pitcher
If a ceramic pitcher is 9.5 inches tall and has a diameter that is 3 3/4 at top and 4 inches at the bottom how many ounces will it hold. There use to be a gallon ratio to inches and you could deduct 30 percent for variating diameters. Do you know the conversion?
November 17, 2013

Loans
I don't know
November 5, 2013

Loans
A borrower received a 30-year ARM mortgage loan for $120,000. Rate caps are 3/2/6 (first adjustment/subsequent adjustments/total over the life of the loan). The start rate was 3.50% and the loan adjusts every 12 months for the life of the mortgage. The index used for this ...
November 5, 2013

physics
A girl is skipping stones across a lake. One of the stones accidentally ricochets off a toy boat that is initially at rest in the water (see the drawing below). The 0.058-kg stone strikes the boat at a velocity of 15 m/s, 15° below due east, and ricochets off at a velocity...
November 4, 2013

Math
Is it sometimes, always or never true that a number is a factor and a multiple of itself?
October 15, 2013

Physics
A block is released from the top of a frictionless incline plane as pictured above. If the total distance travelled by the block is 1.2 m to get to the bottom, calculate how fast it is moving at the bottom using Conservation of Energy.(incline 20 degrees mass of block is 2.5kg)
October 15, 2013

physics
A person pushes a 16.0-kg shopping cart at a constant velocity for a distance of 20.0 m. She pushes in a direction 28.0° below the horizontal. A 54.0-N frictional force opposes the motion of the cart.
October 11, 2013

physics
In an automatic clothes dryer, a hollow cylinder moves the clothes on a vertical circle (radius r = 0.36 m), as the drawing shows. The appliance is designed so that the clothes tumble gently as they dry. This means that when a piece of clothing reaches an angle of è ...
October 11, 2013

physics
Pilots of high-performance fighter planes can be subjected to large centripetal accelerations during high-speed turns. Because of these accelerations, the pilots are subjected to forces that can be much greater than their body weight, leading to an accumulation of blood in the...
October 11, 2013

Physics
A roller coaster at an amusement park has a dip that bottoms out in a vertical circle of radius r. A passenger feels the seat of the car pushing upward on her with a force equal to six times her weight as she goes through the dip. If r = 22.0 m, how fast is the roller coaster ...
October 11, 2013

Physics
The person in the drawing is standing on crutches. Assume that the force exerted on each crutch by the ground is directed along the crutch, as the force vectors in the drawing indicate. If the coefficient of static friction between a crutch and the ground is 0.94, determine ...
October 11, 2013

physics
The drawing shows a wire tooth brace used by orthodontists. The topmost tooth is protruding slightly, and the tension in the wire exerts two forces vector T and vector T ' on this tooth in order to bring it back into alignment. If the forces have the same magnitude of 24.0...
October 11, 2013

Physics
The helicopter in the drawing is moving horizontally to the right at a constant velocity. The weight of the helicopter is W = 59000 N. The lift force vector L generated by the rotating blade makes an angle of 21.0° with respect to the vertical.
October 11, 2013

physics
In the amusement park ride known as Magic Mountain Superman, powerful magnets accelerate a car and its riders from rest to 42 m/s (around 90 mi/h) in a time of 7.3 s. The mass of the car and riders is 5700 kg. Find the average net force exerted on the car and riders by the ...
October 11, 2013

Physics
A person pushes a 16.0-kg shopping cart at a constant velocity for a distance of 20.0 m. She pushes in a direction 28.0° below the horizontal. A 54.0-N frictional force opposes the motion of the cart.
October 10, 2013

Physics
A truck is traveling at a speed of 23.0 m/s along a level road. A crate is resting on the bed of the truck, and the coefficient of static friction between the crate and the truck bed is 0.610. Determine the shortest distance in which the truck can come to a halt without ...
October 4, 2013

science
A man seeking to set a world record wants to tow a 106,000-kg airplane along a runway by pulling horizontally on a cable attached to the airplane. The mass of the man is 77 kg, and the coefficient of static friction between his shoes and the runway is 0.82. What is the ...
October 4, 2013

chemistry
A student took 100 mL of a solution of Mg(OH)2 and reacted it with HCl (aq) to calculate the concentration of hydroxide ions in the solution. If 13.75 mL of 0.010M HCl was used to react with all of the OH- (aq) in the 100-mL solution, what was the concentration of hydroxide ...
October 3, 2013

math
180,000
October 1, 2013

ecology
how do you construct a age pyramid. i have the age class and observed individuals how do i get the present in each age class
September 29, 2013

Physics
ok according to you the answer must be 1.5 but that is wrong :(
September 26, 2013

Physics
A 24.5-kg sled is being pulled across a horizontal surface at a constant velocity. The pulling force has a magnitude of 77.0 N and is directed at an angle of 30.0° above the horizontal. Determine the coefficient of kinetic friction.
September 26, 2013

physics
but if you have two variables how do you solve? I understand that force=ma so the normal force is (284)(9.8)=2783.2, but I don't really understand how to determine when acceleration is .28
September 26, 2013

physics
Several people are riding in a hot-air balloon. The combined mass of the people and balloon is 284 kg. The balloon is motionless in the air, because the downward-acting weight of the people and balloon is balanced by an upward-acting 'buoyant' force. If the buoyant ...
September 26, 2013

Math
How do you write 22 6/9 into an equivalant fraction?
September 11, 2013

Physics
escalator that leads down into a subway station has a length of 27.0 m and a speed of 1.7 m/s relative to the ground. A student is coming out of the station by running in the wrong direction on this escalator. The local record time for this trick is 11 s. Relative to the ...
September 7, 2013

Calculus
Sketch the region enclosed by the given curves. Decide whether to integrate with respect to x or y. Then find the area of the region. 2y = 4(x^(1/2)), y=4, and 2y +2x = 6 I keep getting an area around 21.3 but it is incorrect. Am I close? Thank you!
July 11, 2013

Organic Chemistry
Which odor will be detected first if both containers are opened simultaneously, NH3 or H2S vapors?
July 7, 2013

chemistry
I need the half reactions for this redox reaction: 2KClO3-----> 2KCl + 3 O2
June 9, 2013

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