Wednesday
February 10, 2016

# Posts by charles

Total # Posts: 322

math
jane gets 1/2 of a gold star each time she helps her teacher clean up the classroom after class. How many times would Jane need to help her teacher to earn 3 whole gold stars? Draw fraction. Strips to help.
February 5, 2016

English
to watch
January 29, 2016

Programming Logic and Design
Design an application that accepts eight friends' first names and displays them in alphabetical order
December 3, 2015

derivrtives
Find the derivative of d^2Y/dx^2 of y=e^2t and x=cost^2 and leave your answer in terms of x and y
November 25, 2015

math
Air is pumped into a spherical balloon at the rate of 20cm^3/s^-1.find the rate of change of radius of the balloon when the radius is 6cm
November 25, 2015

probability theory
3 students; A, B and C, are in a swimming race. A and B have the same probability of winning and each is twice as likely to win as C. Find the probability that B or C wins the swimming race. 3) Given three boxes as follows: Box A contains 3 red, 2 white and 2 blue balls. Box B...
November 20, 2015

English
if you want to say he left the stage then your answer should be "He disappeared from stage"..... else both are correct with different meanings..
November 20, 2015

chem
How would your experimental formula of magnesium chloride “MgClx” have been affected if your product was not dried completely before weighing it? Would “x” be too high or two low?
October 28, 2015

Biology
Some people experience “heartburn” when eating fatty, greasy foods (similar to the effect that is felt when eating acidic foods). Why would this occur with fats? I know fatty acids are made of carboxylic acid and if you have too much, would it make sense to say that ...
October 27, 2015

PHYSICS
An automobile accident causes both the driver and passenger front airbags to deploy. a. If the vehicle travelled at a speed of 88.6 km/h is now at rest, find the change in momentum for both the 68.4 kg adult driver and the 34.2 kg child passenger. b. The adult took 0.564 s and...
October 24, 2015

Combinations and Permutations
A committee of 3 members is selected from a club made up of 10 junior members and 20 senior members. What is the expected number of juniors in the committee?
October 4, 2015

Science
The solubility of a compound in water is 6.8g/100ml at 25°C.. Calculate the amount of water required to crystallize 10g of the compound. If the pure compound is collected at 25°C what is the maximum possible yield percent.
September 21, 2015

life science
investigation to determine whether expired air contains carbondioxide
September 6, 2015

Math
A toy company manufactures miniature cars. They sell miniature sports cars in a box. They sell 12 miniature trucks in a box. Mrs. Murphy wants to buy an equal number of sports cars and trucks for the Boys and Girls Club. What is the least number of miniature sports cars she ...
August 16, 2015

maths
A box contains 5 red bowls, 6 yellow bowls and 3 white bowls. If 4 bowls are randomly drawn from the box at the same time, (a)find the probability that exactly 2 red bowls are drawn; (b)find the probability that at least 2 red bowls are drawn.
July 23, 2015

math
A box contains 5 red bowls, 6 yellow bowls and 3 white bowls. If 4 bowls are randomly drawn from the box at the same time, (a)find the probability that exactly 2 red bowls are drawn; (b)find the probability that at least 2 red bowls are drawn. My work: (a) (5/14)^2(6/14)(3/14...
July 22, 2015

Statistics
6739.2
June 7, 2015

physics
consider a vertical piston system. the piston has a 50g mass and a given radius of 3mm. what amount of pressure does the piston exert? ( use g==9.8 m/s^2 )
June 2, 2015

math
what is the surface area of a cube with sides measuring 2 inches?
May 14, 2015

Managerial Economics
1. A principal-agent problems occur when managerial decisions are not consistent with the firm's shareholders' interests. T 2. A firm making more than a normal profit may still be experiencing an economic loss. T 3. An inferior good is a good whose demand decreases as ...
May 13, 2015

english
Choose the correct sentence pattern for the sentence below. I hereby declare Tuesday Shakespeare Day.
April 19, 2015

Chemistry
What volume of carbon tetrachloride (density = 2.71 g/mL) contains 2.46x10^25 chlorine atoms? I did: 2.46x10^25 Cl atoms x 1 atom/4 atoms x 1 mol/6.02x10^23 x 154 g/1 mol x 1 mL/2.71 g And the correct answer is apparently 572 mL when I got 581 mL.
March 29, 2015

Chemistry
but how do you get the right amount of mL? I did: 2.46x10^25 Cl atoms x 1 atom/4 atoms x 1 mol/6.02x10^23 x 154 g/1 mol x 1 mL/2.71 g And the correct answer is apparently 572 mL when I got 581 mL.
March 29, 2015

Chemistry
What volume of carbon tetrachloride (density = 2.71 g/mL) contains 2.46x10^25 chlorine atoms?
March 29, 2015

Chemistry
If 84.1 g of sodium hydroxide are reacted with 51.0 g of aluminum in the following equation: 2NaOH + 2Al + 2H2O --> 2NaAlO2 + 3H2 a) what mass of excess reactant remains? b) what mass of water would react?
March 28, 2015

Physics
A baseball player leads off the game and hits a long home run. The ball leaves the bat at an angle of 30.0o from the horizontal with a velocity of 40.0 m/s. How far will it travel in the air? Working out please
March 17, 2015

Maths
e) A fair coin is tossed 6 times. What is the probability of getting exactly 2 heads? What is the mean of this experiment?
February 7, 2015

Math
I have 14 hundreds, 16 tens and 9 ones. What number am I?
February 4, 2015

Math
January 22, 2015

Math
January 22, 2015

Math
The winner of a raffle will receive 3/4 of the 530.40 raised from raffle ticket sales
January 22, 2015

Math
Delia has 493 stamps in her stamp collection. She can put 16 stamps on each page of an album. How many pages can she fill completely?
January 21, 2015

GRANTHAM
Find the present value of the ordinary annuity. Please round the answer to the nearest cent.\$2,000 per semiannual period for 7 yr at 12%/year compounded semiannually
December 30, 2014

Math
I can't. This is how my math teacher put in the question. Its confusing, right? Its just messed up. I was just hoping if someone can plug in the fraction. If I saw how it looks when its all plugged in I might get it.
December 18, 2014

Math
The denominator of a fraction is one more then the numerator. If 2 were added to both the numerator and denominator, the new fraction equals 4/5. Find the original fraction.
December 18, 2014

Cardiovascular Respirtory
In which condition is the patient most likely to hemorrhage? A. Thalassemia B. Erythroblastosis fetalis C. Thrombocytopenia D. Polycythemia
December 17, 2014

Chem
(V1/n1)=(V2/n2) (5.12÷7.51)=18.3÷n2 n2=26.84mol
December 10, 2014

physics
A 75-g piece of aluminum at 89 °C is dropped in 1.0 L of water at 1.3 101 °C, which is in an insulated beaker. Assuming that there is negligible heat loss to the surroundings, determine the equilibrium temperature of the system
December 8, 2014

math
Gina's art teacher mixes 9 pints of yellow paint with 6 pints of blue paint. Did Gina use the same ratio of yellow paint to blue paint instructed by her teacher.
December 7, 2014

math
taryn and alastair both mow lawns. Each charges a flat fee to mow a lawn. The table shows the number of lawns in the past week, the time spent mowing lawns and the money earned. Taryn mowed 9 lawns. She spent 7.5 hrs mowing lawns. Taryn earned \$112.50 Alastair mowed 7 lawns. ...
December 3, 2014

math
or is this right? 1/3 * 9/7 =7/21 * 27/21 =189/21 =9
November 23, 2014

math
1/3 / 7/9 =1/3 * 9/7 =9/21 is this right??
November 23, 2014

math
thanks! practice will make perfect. thanks for helping me.
November 23, 2014

math
1 3/5 - 5/6 =8/5 - 6/5 =2/5 or is it =1/3/5 - 5/6 =48/30 - 25/30 =23/30 I don't know which one is right. Pleas e help!
November 23, 2014

math
so..... 3/8 + 5/2 =3/8 + 20/8 =23/8 =2 7/8 is this right?
November 23, 2014

math
3/8 + 2 1/2 =3/8 + 5/2 =8/10 =4/5
November 23, 2014

math
yeah!!!!! I love you!!!! So happy. :-)
November 23, 2014

math
so....... 5/7 * 9/10 =45/70 =9/14 is this right???
November 23, 2014

math
5/7 *9/10 =63/70 =9/10
November 23, 2014

math
so...... 5/7 * 9/10 =45/70 =9/14 Did I get it right?
November 23, 2014

math
5/7 * 9/10 = 50/70 * 63/70 =3150/70 =45
November 23, 2014

math
Thanks, I always get confuse.
November 23, 2014

math
4/5 * 3/4 = =16/20 * 15/20 =240/20 =12 is this right?
November 23, 2014

math
A jar contains 133 pennies. A bigger jar contains 1 2/7 times as many pennies. What is the value of the pennies in the bigger jar
November 23, 2014

6. (TCO F) Suppose the December CBOT Treasury bond futures contract has a quoted price of 80-07. What is the implied annual interest rate inherent in the futures contract? Assume this contract is based on a 20-year Treasury bond with semiannual interest payments. The face ...
November 21, 2014

decimals
Hi Teshea. Thanks for your help. But one question though......you said "now multiply the whole no# by the denominator 2x24=48, then divide 48/35, it gives you a decimal 1.371428571n the answer is 1.371.But I thought that when you multiply the whole number by the ...
November 18, 2014

decimals
Mark wants to paint a mural. He has 1 1/3 gallons of yellow paint, 1 1/4 green paint, and 7/8 gallon of blue paint. mark plans to use 3/4 gallon of each paint color. How many gallons of paint will he have left after painting the mural?
November 18, 2014

math
Melina walked her dog 2 1/5 miles. Cathy walked her dog 1 3/4 times as far as Melania did. How many more miles did Cathy walk her dog?
November 15, 2014

Physics
A 1000 kg Toyota, initially traveling at 40 mph, collides into the rear end of a 2000 kg Cadillac, initially stopped at a red light. The bumpers lock and the two cars skid for 2 seconds before coming to rest. Calculate the coefficient of kinetic friction between the tires and ...
November 2, 2014

Science
spring scale
September 14, 2014

math
In order to pass a physical education class at a university, a student must run 1.0 mi in 12.5 min. After running for 10.0 min (assume constant speed), she still has 510 yd to go. What constant acceleration does she need over the final 510 yd in order to make it?
September 14, 2014

Physics
Just saw the flaw. -2.5 in vector B should be -3.5. This has had me stuck for too long.
August 30, 2014

Physics
Thank you for that. I don't understand the rule for "Cy/Cx = 5/6.5; if Cx = 6.5k, then Cy = 5k." I also realize that your solution doesn't match my book's solution. Here's the step by step from the book that I'm not understanding either, perhaps ...
August 30, 2014

Physics
You are given vectors A = 5.0i - 6.5j and B = -2.5i + 7.0j. A third vector C lies in the xy-plane. Vector C is perpendicular to vector A and the scalar product of C with B is 15.0. Find the x and y components to vector C. Answer key shows x component is 8.0, y component is 6.1...
August 30, 2014

chemistry
In the combustion of hydrogen gas, hydrogen reacts with oxygen from the air to form water vapor. If you burn 54.8 g of hydrogen and produce 4.90 × 10^2 g of water, how much oxygen reacted?
August 29, 2014

chemistry
In the combustion of hydrogen gas, hydrogen reacts with oxygen from the air to form water vapor. If you burn 54.8 g of hydrogen and produce 4.90 × 102 g of water, how much oxygen reacted?
August 29, 2014

Physics
A stone projected vertically upward with a speed of 30ms from the top of a tower of height 50m neglecting the air resistance.determine the maximum height it reach from the ground
August 5, 2014

Math
A homeowner is laying sod in her lawn. The lawn is a rectangle with dimensions of 28'*18'. If one piece of sod is a rectangle with dimensions of 60 cm*40 cm, approximately how many pieces of sod should the homeowner order?
July 18, 2014

physics
With brakes fully applied, a 1370 kg car deccelerates from a speed of 98.0 km/hr. What is the work done by the braking force in bringing the car to a stop?
July 11, 2014

physics
A force of 1.57 N pushes against an object with a mass of 0.16 kg for 3.00 min. The object does not move. What is the work done on the object by the force?
July 11, 2014

chemistry
What is the mass of water obtained when mix 100.0 mL of 2.5 M. HNO3 with 100.0 mL of 2.55 M. KOH?
July 8, 2014

chemistry
Calculate the mass of oxygen (in mg) dissolved in a 5.00 L bucket of water exposed to a pressure of 1.13 atm of air. Assume the mole fraction of oxygen in air to be 0.21 and the Henry's law constant for oxygen in water at this temperature to be 1.3 x 10-3 M/atm.
May 26, 2014

math
f (x) = (50-w) (75-w)?
April 25, 2014

algebra
how many{distinct letters in the word food}
April 11, 2014

algebra
{distinct letters in the word food}
April 11, 2014

physic
If wind blows at 34m/s over a house, what is the net force on the roof if its area is 170m2 and is flat? (At 20 ∘ C dry air has a density of 1.2 kg/m3).
April 7, 2014

physic
A 69-cm-diameter wheel accelerates uniformly about its center from 150rpm to 320rpm in 4.4s . Determine angular acceleration?
March 29, 2014

Physic
Calculate the mass m needed in order to suspend the leg shown in the figure(Figure 1) . Assume the leg (with cast) has a mass of 15.5kg , and its CG is 35.5cm from the hip joint; the sling is 76.5cm from the hip joint.
March 29, 2014

Physical Science
The air temperature on a certain day is 86 degrees F A)Convert to Celsius? B) Calculate the sound of speed in air? C)When a 653Hz tornado siren is turned on, the sound takes 2.3s to reach an observer. How far is the observer from the main siren, and what is the wavelength of ...
March 2, 2014

Physical Science
An ultrasonic wave in water is a compression wave that travels at 1,400 m/s A) An ultrasonic wave from a ship travels to the bottom of a lake and back in 0.16s. How deep is it at this point? B) If an ultrasonic wave is emitted in the ocean where the ocean's depth is 3.5km...
March 2, 2014

statistics
20-8+1=13
December 26, 2013

Chemistry
Can someone please help me answer these questions? Is additional information other than what is given needed to solve? Thanks in advance. 1) Calculate the PH of a buffer containing 0.100 M propanoic acid, HC3H5O2 and .100 M NaC3H502 after the following have been added. Ka for ...
December 13, 2013

English
We heard tommy's loud drumming clearly despite the _______ of the elementary school band practice. A. Esprit B. Concordance C. Animadversion
October 28, 2013

science
I am doing a titration lab and need help with a problem. (i used .100M H2SO4)(I used 10.0 ml of Ba(OH)2 solution and added 50.0 ml of distilled water making 60.0 ml total.) 1. Use the titration results to calculate the moles of H2SO4 that were used to reach the equivalence ...
October 12, 2013

College Algebra
Express 0.000093 in scientific notation. Can anyone help?
September 8, 2013

physics
determine the pressure of a 20 lb force is applied to an area of 10 inch squared
September 7, 2013

physics
determine the pressure of a 20 lb force is applied to an area of 10 inch squared
September 7, 2013

Physics
“Strontium-90 is a pure beta source.” How could a physicist test this statement? I am stuck on this one, but I was thinking through measurement of radioactivity.
August 30, 2013

Is the main characher in Football Futigive more like an equilateral isosceles or scalene?
August 28, 2013

math
Dents and Dings Auto Body buys paint with a list price of \$29,000. If the supplier extends trade discounts of 30/35/20, what is the trade discount amount?
August 24, 2013

economics
In the simple economics of a competitive market price increases under which condition?
August 14, 2013

General Physics
A 4 kg block slides along a frictionless horizontal with a speed of 5.1 m/s. After sliding a distance of 7 m, the block makes a smooth transition to a frictionless ramp inclined at an angle of 13 degrees to the horizontal. The acceleration of gravity is 9.81 m/s2. How far...
July 26, 2013

General Physics
A 0.377 kg bead slides on a curved wire, starting from rest at point A(4.8 meters) as shown in the figure. The acceleration of gravity is 9.8 m/s2 . A. If the wire is frictionless, find the speed of the bead at B(0 Meters). Answer in units of m/s B. Find the speed of the bead ...
July 26, 2013

General Physics
A block sliding on a horizontal surface has an initial speed of 0.5 m/s. The block travels a distance of 1 m as it slows to a stop. What distance would the block have traveled if its initial speed had been 1 m/s? 1. 2 m 2. 1 m 3. more information is needed to answer the ...
July 26, 2013

General Physics
Suppose that the force on the block FT is increased so that the block accelerates (starting from rest) at a = 2.2 m/s2. Now what is the net work done by all the forces acting on the block as it moves a distance of 15 m? 1. Wnet = −1968.75 J 2. Wnet = 1155 J 3. Wnet = ...
July 26, 2013

General Physics
A 35 kg block is pulled at a constant speed along a horizontal surface by a rope with tension FT . The rope is inclined at an angle from the horizontal as shown. The block moves a distance 15 m along the horizontal surface. What is the net work done by all the forces acting on...
July 26, 2013

General Physics
A force Fx acts on a particle. The force is related to the position of the particle by the formula Fx = (5.9 N/m3) x3. Find the work done by this force on the particle as the particle moves from x = 0.9 m to x = 22 m. Answer in units of J
July 26, 2013

General Physics
A spring with spring constant of 28 N/m is stretched 0.2 m from its equilibrium position. How much work must be done to stretch it an additional 0.06 m? Answer in units of J
July 26, 2013

General Physics
A 7453 N piano is to be pushed up a(n) 4.04 m frictionless plank that makes an angle of 25.9 with the horizontal. Calculate the work done in sliding the piano up the plank at a slow constant rate. Answer in units of J
July 26, 2013

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