Friday
May 6, 2016

Posts by DAVE

Total # Posts: 750

Calculus
Use Simpson's rule with n = 4 to approximate. Keep at least 2 decimal places accuracy. Integrate: (cos(x))/(x) x=1 to 5
May 3, 2016

chem
Determine the mass of oxygen in a 7.2-g sample of Al2(SO4)3
April 18, 2016

chemistry
A sample of water is known to contain 1.51 × 10^24 H2O molecules. How many moles of H2O molecules are present in the sample?
March 22, 2016

Math Algebra Intermediate
How do I Factor the expression a y - a^{6} y^{6} ?
March 4, 2016

Chem
What type of orbitals are used to form the N–N bond in hydrazine, N2H4?
March 2, 2016

Chemistry
What set of hybrid orbitals is used by Xe in XeO3F2? dsp2 d2sp3 sp3 dsp3 d2sp
March 2, 2016

Marshall Middle
Of 450 lunches old at school on Thursday, 40% were hamburgers and the rest were pizza. How many  more pizza lunches were sold than hamburgers?
February 28, 2016

Trig
a 12-ft-long guy wire is attached to a telephone pole 10.5 ft from the too of the pole. If the water forms a 52 degree angle with the ground, how high is the telephone pole?
February 17, 2016

maths
a sheet of 8 x 4 ply how many sheets to cover 13ft 6 x 13 ft
February 16, 2016

Math
Can somebody show or explain this to me: Change 6 2/3% to fraction and .6 1/3 to a decimal or fraction.
February 13, 2016

Finance
Celeste just borrowed 47,500 dollars. She plans to repay this loan by making equal quarterly payments of 3,126.28 dollars for 19 quarters. If she makes her first quarterly payment later today, then what is the quarterly interest rate on the loan?
February 1, 2016

Check my Essay Plz?!
9/10
January 25, 2016

Maths
depends on the sequence
January 25, 2016

Math
Lim sin(60-x)/2cosx-1 x approaches 60
January 2, 2016

math
on office equipment sales representative earns a weekly salary and commission on his sales. one week his total compensation on sales of $7000 was $700, the next week his total compensation on sales of $8000 was $740, find the weekly salary and commission rate
December 13, 2015

Math
What is the percentage chance that the same number can be pulled twice when there are 12 numbers in a hopper? If the number that is pulled is placed back in the hopper and then pulled for a second time what is the chance that the same number is pulled for the second time?
December 9, 2015

Physics
A brick is initially 12.90 cm high and an aluminum can is initially 12.91 cm high. By how much must their temperatures be raised in order for the brick and the can to have exactly the same height?
December 8, 2015

Physics
A 1.05 liter flask contains a certain quantity of ideal gas at 305 K. Then an equal number of molecules of the same gas is added to the flask, after which the absolute pressure is 1.55 times its original value. What is the final temperature?
December 8, 2015

Physics
By how much does the air pressure in a house increase if the house is sealed and the air temperature increases from 10.7° C to 21.0° C? The initial air pressure is 1.00 atmosphere.
December 8, 2015

Physics
Find the volume occupied by 3.14 moles of an ideal gas at standard conditions of pressure and temperature (P = 1.00 atm, T = 273 K).
December 8, 2015

Physics
A watertight car is submerged under water. What force is required to open a door of area 1.12 m2 if the average depth of water at the door is 1.50 m?
December 8, 2015

Physics
A certain concrete will support a maximum compressive stress of 1.30 107 N/m2 before being crushed. A column of uniform width is to be made with this concrete. How tall can the column be if the stress in it at any point is not to exceed one half the maximum value? The weight ...
December 8, 2015

Physics
A man doing a slow push-up is approximately in static equilibrium. His body is horizontal, with his weight of 750 N supported by his hands and feet, which are 1.36 m apart. One hand rests on a spring scale, which reads 268 N. If each hand bears an equal weight, how far from ...
December 8, 2015

Calculus
Gloria would like to construct a box with volume of exactly 45ft^3 using only metal and wood. The metal costs $15/ft^2 and the wood costs $6/ft^2. If the wood is to go on the sides, the metal is to go on the top and bottom, and if the length of the base is to be 3 times the ...
November 4, 2015

math
5 inches is what fraction of a foot? A. 1/3 B. 1/2 C. 5/12 D.5/24 my answer is C. is it correct?
October 27, 2015

Math
I think the domain would be (-∞, 7]. I am not sure if it is correct. I got the above part correct though.
October 13, 2015

Math
The above function is given: f(x)= sqrt of (2x-6)/(x-8) - Sarah describes the domain as [3, ∞). - Describe why her domain is incorrect. - Provide the correct domain for the function. (I sort of understand this).
October 13, 2015

Maths
I need some help with my maths questions please! What angle does the tangent to the curve y=x^4-x^3+7x make with the positive direction of the x-axis at the point where x=2? Find any x values for which the gradient of the tangent to the curve y=x^2-3x-1 is parallel to the line...
October 13, 2015

math
Consider the equation f(x)= -2 sqrt(X+3). List in order the transformations applied to the parent function.
October 9, 2015

algebra
.625
September 15, 2015

math
How can you get the answer x = -215.91, 167.45
August 30, 2015

math
Find x 1) x^2*23y^2 = 1.78x10^32*z 2) 1.3*10^-4 x=4.7/x -6.3*10^-3 Please help
August 30, 2015

chemistry
if 1.37 moles of Pb(NO3)2 is mixed with 2.56 moles of KI, how many moles of PbI2 are produced?
August 30, 2015

Math
Find the area of a triangle with base of 15 m and altitude of 12 m
August 6, 2015

Physics, Eectric flux
A cubical Gaussian surface surrounds three positive charges, each has a charge q1 = +4.00 × 10-12 C, and two negative charges, each has a charge q2 = −2.30 × 10-12 C as the drawing shows. What is the electric flux passing through the surface?(The permittivity...
July 13, 2015

Math
Find r in a geometric sequence if A=2 and A10=1024
June 23, 2015

Science
Thank you. It was more of a answer confirmation for my own knowledge!
June 11, 2015

Science
I have 59.73 grams of a solid dissolved into water. The total is now 115ML of water. I added the water into a beaker already containing said solid. I did not measure how much water I put into the beaker. 59.73g/115ML=0.51g/ML My question is. Is this the correct way to mix and ...
June 11, 2015

Chemistry
The answer is 5.83g
June 4, 2015

Chemistry
What is the molarity of a bleach solution containing 6.6 g of NaOCl per liter of bleach? answer please
May 25, 2015

Chemistry
How many milliliters of a 5.0 M H2SO4 stock solution would you need to prepare 111.0 mL of 0.36 M H2SO4?
May 25, 2015

Physics (optics)
Please this UT quest is due in 30 minutes
May 12, 2015

Physics (optics)
A ray of light traveling in air strikes the midpoint of one face of an equiangular glass prism (n = 1.74) at an angle of exactly 30.0â—¦ Trace the path of the light ray through the glass and find the angle of incidence of the ray at the bottom of the prism. ...
May 12, 2015

Algebra II
if im reading this correctly, youre multiplying (x+10) by -5 and 2, so distribute the numbers so you get -10x-100 and then add 100 to both sides and divide both sides by -10 to get your answer
May 12, 2015

Algebra ii
if im reading this right, multiply both sides by 3 to cancel it from the left and distribute 4 into (x-16) to get 4x-64. add 64 to both sides and divide the final number on the right by 4 to get x
May 12, 2015

4th grade science
increasing the air temperature increases the airs ability to hold more water, which is why its really humid when it's hot outside. Increasing the room temp increases the relative humidity.
May 12, 2015

algebra
wtf this makes no sense without said graph
May 12, 2015

physics
A man walks 5.0m due east and then 10.0m N30oE . Find his resultant displacement
April 17, 2015

Physics
thank you kind sir
April 8, 2015

Physics
What is the mass of a child if the force of gravity on the child's body is 100 N? A. 9.8 kg B. 4.45 kg C. 22.5 kg D. 10.2 kg what?
April 8, 2015

Physics
Oh My God, thank you so much
April 8, 2015

Physics
If a tank contains water 4 m deep, what is the pressure at the bottom of the tank? (Neglect the atmospheric pressure.) A. 39.2 kPA B. 18.9 kPA C. 4.0 kPa D. 9.8 kPA Im really lost
April 8, 2015

Consumer Math
If XYZ stock is quoted at 523/4 per share, what is the market price per share A. $52.75 B. $52.34 C. $275.00 D. $75.00? A?
April 3, 2015

American History
thank you, I was pretty confused
April 3, 2015

American History
then D?
April 3, 2015

American History
Which statement best describes the Monroe Doctrine? A. The United States welcomed European involvement in all issues in North America. B. The United States welcomed any European involvement in South America. C. The United States pledged to involve itself as much as possible in...
April 3, 2015

American History
thank you
April 3, 2015

American History
American soldiers first faced guerilla tactics during which war? A. Philippine-American War B. World War II C. Vietnam War D. Korean War I believe its A
April 3, 2015

American History
so D? or B?
April 3, 2015

American History
so D?
April 3, 2015

American History
Which of the following directly led to the American Civil War? A. The Lecompton Constitution B. The secession of many Southern states from the union C. The decision in the Dred Scott v. Sandford case D. The election of Abraham Lincoln C?
April 3, 2015

Physics
A hockey player is initially moving at 5.00m s to the east. Her mass is 50.0 kg. She intercepts and catches on her stick a puck initially moving at 35.0m s at an angle of 30 degrees (Fig. 6.40). Assume that the puck’s mass is 0.50 kg and the two form a single object for a...
April 1, 2015

chemistry
Work it out
March 18, 2015

World History
I have, i couldnt find anything, can you direct e to a website with information that you might find is useful to me?
March 10, 2015

World History
so its either A or C
March 10, 2015

World History
thats whats tripping me up, one says leader while the other says head, Sukarno was the first president but im not sure if suharto was first leader of anything
March 10, 2015

World History
?_? actually, i answered incorrectly, i thought the question was asking for a true statement, but now im confused, wasnt indonesia formerly the netherlands east indies?
March 10, 2015

World History
Regarding Indonesia, which of the following statements is false? A. Indonesia was formerly the British East Indies. B. The first head of Indonesia was Sukarno. C. The first leader of Indonesia was Suharto. D. Indonesia was formerly the Netherlands East Indies. D?
March 10, 2015

Algebra
Find the principal when the amount in the account is 11,000 and rate of interest is 3.45 percent compounded interest is quarterly for 2.5 years.
March 5, 2015

Calculus Physics
Use newton's law of gravitation F=G*(m1m2/r^2) we get: G*(81.4 m1*m2)/r^2 = G*(m1*m2)/(3.85x10^8-r)^2 you can then cancel the G, m1, m2 and get 81.4/r^2=1/(3.85x10^8-r)^2 take sqrt: sqrt(81.4)(3.85x10^8-r)= r solve for r r=346,585,261m ..... and yes Tenzin hes from CCNY lol
March 2, 2015

Physical Science
The main difference between the internal combustion engine and the diesel engine is that the diesel engine A. does not have a crankshaft. B. does not utilize pistons. C. has no connecting rods. D. has no ignition system. pretty sure its d
February 27, 2015

Chemistry
okay, now im sure its D
February 25, 2015

Chemistry
oh my, my mistake, then would it be D or B?
February 25, 2015

Chemistry
oh my, my mistake, then would it be D or B?
February 25, 2015

Chemistry
A solution that contains a large amount of salt and a small amount of water is said to be a _______ solution. A. unsaturated B. saturated C. dilute D. concentrated im pretty sure its C
February 25, 2015

Chemistry
thank you i wasnt sure :)
February 25, 2015

Chemistry
The statement "matter can be neither created nor destroyed by chemical means, but it can be changed from one form to another" is the chemical law of A. definite proportions. B. atomic disintegration. C. conservation of energy. D. conservation of matter. im not sure ...
February 25, 2015

Science
Reflecting telescopes are popular because they're A. more durable than a refracting telescope. B. easier to build than a refracting telescope. C. smaller than a refracting telescope. D. more powerful than a refracting telescope i said b but im torn between a and b
February 25, 2015

Electricity and Electronics
thanks ;D
February 24, 2015

Electricity and Electronics
A complete circuit contains two parallel-connected devices and a generator for providing the electromotive force. The resistance of the first device is 12 ohms, the resistance of the second device is 4 ohms, and the voltage developed by the generator is 40 V. What is the ...
February 24, 2015

Algebra
Isaac wants to enclose his backyard with a fence that is bounded on one side by the back of the house. if he has 164 feet of fencing material find the maximum area that can be enclosed by the fence.
February 20, 2015

math
A real estate agent makes 4.5% commission on every property she sells. How much commission does she make on a sale of a house for $132,500.00? Don't understand how to do the problem. Can you help me? Thank you
February 17, 2015

Physics
W=Fd 312J=F(2.0m) F=(312J)/(2.0m)
February 13, 2015

Algebra
Length of a side on a square is 5cm longer than the side of another square. the total area is 193cm. what is length of original?
February 10, 2015

Math
144
January 29, 2015

Math
A boat has a speed of 4 m s −1 (relative to the surrounding water) and a heading of 170◦ . There is a current flowing from a bearing of 105◦ at a speed of 2.5 m s −1 . Take i to point east and j to point north. (a) Express the velocity u of the boat ...
January 18, 2015

Algebra
write the expression for the perimeter of the pond
January 15, 2015

chemistry
Lol wow, way to be a grammar nazi DrBob, but also, there is an algebraic method to balancing equations I learned in first year chemistry. I don't remember it, but if youre good in algebra, it would be very useful!
January 12, 2015

Language Arts
Nope, it was C, just took the assesment.
December 17, 2014

Language Arts
The choices are: A. The port of Boston was closed to all ships, and huge numbers of workers lost their jobs. Many people struggled to put food on their tables B. British soldiers were sent to Boston to enforce British Law. The soldiers camped on the common, carried muskets, ...
December 17, 2014

Language Arts
Which of the following statements best summarizes the "fiddler's bill" Bostonians had to pay for the tea party, as described in Section 1 of Chapter VII? I read the book and spark notes talking about it, but I still need help, does anyone know this?
December 17, 2014

chemistry
Iron and oxygen gas can react to form the magnetic oxide of iron Fe3O4. How many grams of Fe3O4 can be made from 13.2 g of O2?
December 8, 2014

Fraction
Convert both to fractions. 7 * 8 + 5 = 61/8 13 * 8 = 104/8 Subtract both fractions 104/8 - 61/8 = 43/8 Convert 43/8 to mixed number 43 / 8 = 5 3/8
December 8, 2014

Chemistry
You are correct, A.
December 8, 2014

Math
Convert the percent to a decimal. 50% -> .50 Multiply 36.75 by .50 36.75 * .50 = 18.375 Add 18.375 to 36.75 $55.125 is your answer
December 8, 2014

general chemistry
I know an alysia at kellam high school.
December 8, 2014

Physics
Thanks!
December 8, 2014

Physics
Consider the 690 N weight held by two cables. The left-hand cable had tension T2 and makes an angle of 41◦ with the ceiling. The right-hand cable had tension T1 and makes an angle of 42◦ with the ceiling.
December 8, 2014

chemistry
False
December 6, 2014

chemistry
The molar mass is 325.28804 g/mol. Divide the amount given by the molar mass and that is your # moles. Answer is .2278 moles
December 6, 2014

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