Tuesday
February 9, 2016

Posts by justin

Total # Posts: 875

Chemistry
A Sample of M2O3 weighing 11.205g is converted to 15.380g of MCL3, where M is the unknown metal, then what is the identity of M?
February 5, 2016

math
If sierra swims laps every morning for week . she swims 4/5 of a mile every morning. how many miles does she swim in one week Do i multiply or divide 5/1 x 4/5. please help
February 3, 2016

Math
A bag contains 3 blue marbles, 4 red marbles, and 2 white marbles. Three times you draw a marble and return it. Find the probability. P(all white)
February 1, 2016

Computer Science
Create a class called Shapes that has a private int field named radius and the proper get- and set- methods (according to our Java coding standards). Create a constructor that takes an integer as a parameter to initialize the radius. Create a void method called report() that ...
January 28, 2016

Math
There are 15 vegetables in the garden. they are planted in rows of 5. there are 2 carrot plants and 3 potato plants in each row. how many carrot plants are in the garden?
January 28, 2016

math
grantvilles governor receved 3 times as many votes as carys governor.carysgovernor received 790 votes. how many people voted altogether
January 14, 2016

stat
While technology or a​ t-distribution Distribution Table can be used to find the​ area, in this​ problem, technology will be used. Find the​ P-value associated with t t0equals=1.34 and 19 degrees of​ freedom, rounding to three decimal places. Can ...
December 13, 2015

Physics
A 50 gram mass vibrates in SHM at the end of a spring. The amplitude of the motion is 0.12 meters, and the period is T= 1.70 seconds. Find: The maximum acceleration of the mass? The speed of the mass when the displacement is 0.06 meters?
December 7, 2015

Humanities
Having trouble answering these questions, about John Kani's film (Nothing but the Truth). 1. How does Mda see memory and identity as being linked? How is this reflected in Kani’s play? 2. How does the play mirror the intentions and role of the Truth and Reconciliation...
December 6, 2015

Physics
A steel bar has an initial length of 40 meters when the temperature is 20 oC. At what final temperature will the steel bar have a final length of 40.01 meters? The coefficient of linear expansion of steel is 12E-6 (1/C).
December 6, 2015

Physics
A 35-g block of ice at -14°C is dropped into a calorimeter (of negligible heat capacity) containing 400 g of water at 0°C. When the system reaches equilibrium, how much ice is left in the calorimeter? The specific heat of ice is 2090 J(kg K) and the latent heat of ...
December 5, 2015

precalc
Solve: round to the thousandths if necessary! 1) 4^3/4x+5 = 12 2) log(x-1) + log x = log 6 3) 2log(base 4) 5 - log(base 4) x + log(base 4) 3 - log(base 4) 7 = 1/2
December 2, 2015

Language arts
Is anyone right?
December 1, 2015

Calculus
Use integration by parts to evaluate the definite integral. S 12 x/sqrt of x+4 dx 0
November 12, 2015

physics
The potential energy of a pair of hydrogen atoms separated by a large distance x is given by U(x)=-C(subscript)6/x^6, where C_6 is a positive constant. What is the force that one atom exerts on the other? Is this force attractive or repulse? I've taken the derivative of ...
November 11, 2015

Chemistry
Enthalpy I'm given that the heat of reaction for the combustion of ethane is -1560kJ/mol. I need to figure out how much heat is produced from 18g of ethane. 2 C2H6 + 7 O2 --> 4 CO2 + 6 H2O Okay so I'm rough on Thermo right now, so I gave it my best shot. Could we ...
November 8, 2015

Chemistry
Enthalpy I'm given that the heat of reaction for the combustion of ethane is -1560kJ/mol. I need to figure out how much heat is produced from 18g of ethane. 2 C2H6 + 7 O2 --> 4 CO2 + 6 H2O Okay so I'm rough on Thermo right now, so I gave it my best shot. Could we ...
November 8, 2015

Chemistry
Enthalpy I'm given that the heat of reaction for the combustion of ethane is -1560kJ/mol. I need to figure out how much heat is produced from 18g of ethane. 2 C2H6 + 7 O2 --> 4 CO2 + 6 H2O Okay so I'm rough on Thermo right now, so I gave it my best shot. Could we ...
November 8, 2015

Calculus 1
Locate the absolute extrema of the function f(x)=Sinpix on the closed interval [1,1/3]
November 4, 2015

Calculus
Evaluate ∫ (cos(x))^(1/2)sin(x)dx Let u = cos(x)? ∫ (u)^(1/2)sin(x)dx = ∫ [2u^(3/2)/3]sin(x)dx ∫ [2cos(x)^(3/2)/3] (-cos(x)) dx? I thought this involved the FTC, but now I'm thinking that's false.
November 4, 2015

Calculus
Alright, I want to see if I understand the language of these two problems and their solutions. It asks: If F(x) = [given integrand], find the derivative F'(x). So is F(x) just our function, and F'(x) our antiderivative? 1) F(x) = ∫(2, x) [t^(3)+1]^(1/2)dt Let u...
November 4, 2015

Calculus
Use a Riemann sum with n = 3 terms and the right endpoint rule to approx. ∫(1, 2) sin(1/x)dx. My teacher just needs the terms written out, no need to add or multiply. This is a problem she did up on the board, so here's her answer: sin(4/3)(1/3) + sin(5/3)(1/3) + sin...
November 4, 2015

maths
If you reduce one side by the same amount of what you increase on another side, the differences should cancel out. Thus the perimeter should stay the same, easily leaving 48(Perimeter of your rectangle AND square) to be divided by 4 (sides of a square).
October 16, 2015

Calculus
Differentiate to find critical numbers and leave function in fully factored form. g(x) = (x^2+1)^5(x^2+2)^6 g'(x) = (x^2+1)^5[6(x^2+2)^5(2x)] + (x^2+2)^6[5(x^2+1)^4(2x)] g'(x) = 2x(x^2+1)^4(x^2+2)^5[6(x^2+2)(2x) + 5(x^2+1)(2x)] g'(x) = 2x(x^2+1)^4(x^2+2)^5(11x^2+11...
October 14, 2015

chemistry
Two identical elements covalently bonded together. (Di - two) (Atomic - atoms). This refers to how certain elements occur in nature. For example, hydrogen is a gas found in nature as H₂. This does not involve ionic bonding. If I am correct, this occurs only with nonmetal...
October 13, 2015

chemistry
I am not a tutor so I am sorry if cause misunderstanding. You have aqueous solutions that involve salt and sugar as your solutes. The solvent just holds the solute in the solution. However, salts are ionic compounds that completely dissociate(separate) in solution. This means ...
October 13, 2015

science
I'm no anatomical genius but, 1.) is incorrect since sperm is only found in males. 2.) correct 3.) Eggs are not supposed to really provide anything to the mother. The egg + sperm is the child (zygote). First think of how a zygote (male sex cell + female sex cell) would ...
October 13, 2015

Math
My numerator is less than my denominator.I am more than 1/2. What fractions can Ibe
October 9, 2015

Geometry
Point D is on the interior of angle ABC. Use the given information to find m angle DBC. (Draw the picture.) M angle ABC = (5x +6) M angle ABD = (7x - 9) M angle DBC = (5x - 6) Answer so far: (5x + 6) + (5x - 6) = (7x - 9) 10x = 7x - 9 10 x - 7x = -9 3x = -9 X = -3 Do not ...
October 5, 2015

Calc
An airplane is flying at a speed of 350 mi/h at an altitude of one mile and passes directly over a radar station at time t=0. a) Express the horizontal distance d (in miles) that the plane has flown as a function of t. I really don't know... would it be something like d= t...
October 5, 2015

Calculus
Finding critical numbers g(theta) = 16(theta) - 4tan(theta) I can only get the derivative of g to be g'(theta) = 16 - 4sec^2(theta). Am I supposed to move on to get sec^2(theta) = 4, then sec(theta) = 2?
October 4, 2015

Calculus
We are finding critical numbers f(x)= 8x^3+x^2+8x f'(x)=24x^2+2x+8 -> 2(12x^2+x+4) I'm honestly stuck. All I can tell is that I need to set my f'(x)=0, but I am lost there too. Quadratic form. equates to (-1±i√191)/24 I believe. That is as far as I ...
October 4, 2015

Calculus
We are finding critical numbers f(x)= 8x^3+x^2+8x f'(x)=24x^2+2x+8 -> 2(12x^2+x+4) I'm honestly stuck. All I can tell is that I need to set my f'(x)=0, but I am lost there too. Quadratic form. equates to (-1±i√191)/24 I believe. That is as far as I ...
October 4, 2015

Calculus
We are finding critical numbers f(x)= 8x^3+x^2+8x f'(x)=24x^2+2x+8 -> 2(12x^2+x+4) I'm honestly stuck. All I can tell is that I need to set my f'(x)=0, but I am lost there too. Quadratic form. equates to (-1±i√191)/24 I believe. That is as far as I ...
October 4, 2015

Calculus
So chain rule is necessary since x and y are different variables on one side, forming a composition?
September 27, 2015

Calculus
Find y" by implicit differentiation. x^3+y^3 = 1 (x^3)'+(y^3)' = (1)' 3x^2+3y^2(y') = 0 3y^2(y') = -3x^2 y' = -3x^2/3y^2 y' = -x^2/y^2 y" = [(y^2)(-x^2)'-(-x^2)(y^2)']/y^4 y" = [(y^2)(-2x)-(-x^2)(2y)]/y^4 y" = [(-2xy^2...
September 27, 2015

Calculus
y" = (2x+4)(-1.5(x+1)^-2.5) + (x+1)^-1.5(2) y" = (x+1)^-1.5[2+(2x+4)(-3/2(x+1))] y" = (x+1)^-1.5[2+(-6(x+1)/2(x+1))] y" = (x+1)^-1.5[2+(-3)] y" = -(x+1)^-1.5 Also, thank you for your time!!
September 26, 2015

Calculus
Just got through with derivatives, power rule, and chain rule. I am supposed to find the first and second derivatives of the function. y = 4x/√x+1 and y = cos^2(x) y' = [(x+1)^(1/2)(4)]-[(4x)(1/2(x+1)^(-1/2))(1)] y' = [4(x+1)^(1/2)-4x]/[2(x+1)^(1/2)(x+1)] y'...
September 26, 2015

Calculus
We just learned derivatives and now on the Chain Rule. y = r/[(sqrt)(r(sqrd)+1)] y' = [[(sqrt)(r(sqrd)+1)(r)'] - [(r)(sqrt)(r(sqrd)+1)']] / [(sqrt)(r(sqrd)+1)](sqrd) y' = (sqrt)(r(sqrd)+1) - r[1/2(r(sqrd)+1)(raised to -1/2)](2r) My final answer is -3r/[2(sqrt)(...
September 25, 2015

physics
A rocket is fired at an angle from the top of a tower of height h0 = 65.5 m . Because of the design of the engines, its position coordinates are of the form x(t)=A+Bt2 and y(t)=C+Dt3, where A, B, C , and D are constants. Furthermore, the acceleration of the rocket 1.50 s after...
September 19, 2015

Math
3 because 9/3 is 3
September 8, 2015

Math
What is the square root of 9? 9/3 3 so 3 is the square root of 9
September 8, 2015

calculus
a particle starts from rest and moves along a straight line with an acceleration equal to 24-15√t where distance and time are measured in terms of feet and seconds respectively. with what acceleration will the particle return to the starting point?
September 4, 2015

calculus
find the equation of the curve for which y''=(12/x^3) if it passes through (1,0) and is tangent to the line 6x+y=6 at that point.
August 10, 2015

calculus
find the equation of a curve for which y''=6x-6 if the curve has a critical point at (2,1).
August 10, 2015

calculus
find the equation of the curve for which y''=6x-4 and which passes through (1,2) and (-2,5).
August 10, 2015

calculus
find the equation of the curve for which y'=3x^2 and which passes through (1,-1)
August 10, 2015

calculus
Find the equation of the curve for which y''=6x-4 and which passes through (1,2) and (-2,5). thank you :-)
August 6, 2015

calculus
Find the equation of the curve for which y'=3x² and which passes through (1,-1).
August 6, 2015

calculus
If dy=(2x+1)dx and y=7 when x=1, find the value of y when x=3.
August 6, 2015

math algebra
At your local bar, chicken wings cost $0.30 a piece on Thursday night. Sriacha Ranch dressing (enough for 10 wings), cost $0.10 per serving. A pitcher of of ice tea cost $7.50 and a serving of celery cost $2.50 . Tax in your part of LA County is 8.5% and the standard tip rate ...
August 3, 2015

Math
a woman drives to work and averages 70 kilometers per hour for the trip. On her trip from work to home she averages 100 kilometers per hour. What is her average speed for the round trip?
July 15, 2015

Algebra
Problem solving (point of intersection) You are considering changing your cell phone plan . Company A offered a flat fee of $40 plus 10cents for each additional min of use. Company B offers a monthly flat fee of $20 plus 15 cents for each additional min of use. What plan would...
July 13, 2015

Problem solving (point of intersection)
You are considering changing your cell phone plan . Company A offered a flat fee of $40 plus 10cents for each additional min of use. Company B offers a monthly flat fee of $20 plus 15 cents for each additional min of use. What plan would you choose? Equation : y=. x+ Equation...
July 13, 2015

Problem solving (point of intersection)
Alpine Valley charges $10/hr for lessons and $40 for the lift ticket and snowboard rental. Chicopee Hills charges $20/hr which includes lessons, lift ticket and rentals. Which resort would you choose? Equation A: y=. X+ Equation B: y=. X+ Decide on a reasonable starting point ...
July 13, 2015

statistics
A simple random sample of 1350 registered voters shows that 58% favor Candidate A over Candidate B. Construct a 99% confidence interval for the percent of the population of all registered voters who prefer Candidate A over Candidate B.
May 13, 2015

trig
Find the values of sin 0, cos 0, and tan 0ƒáif the angle 0ƒáis in standard position and its terminal side passes through the point (¡V15, 8). Give answers as fractions.
May 3, 2015

phisical science
What is the amplitude of a longitudinal wave
April 6, 2015

M ath
Thank you, Yes I can do B from here.
April 3, 2015

M ath
Sally has a sum of $26000 that she invests at 9% compounded monthly. What equal monthly payments can she receive over a period of a) 9 years? b) 7 years?
April 3, 2015

english
Using a single formatting _____ helps to make reading researched information easier;it lets the reader know what to expect.  A. Citation  B. Text  C. Style  D. Website  My answer was b it was wrong so I'm thinking the answer is c
March 23, 2015

English
To use another's ideas in your own words is to ___ those ideas. A. Paraphrase B. establish C. Manifest D. Refute My answer was b I got it wrong so would the answer be A
March 23, 2015

English
No B
March 23, 2015

English
Would the answer be A
March 23, 2015

English
Which of the following would most likely be an entry in a sentence outline? A. Education tool B. Education can change a person's life C. Education as a pathway D. Education beyond high school versus education beyond college My answer was D I got it wrong Would it be a
March 23, 2015

CHECK ANSWERS PLEASE!!!
Hi
March 18, 2015

Physics
A body of mass m is suspended from a spring with spring constant k and the spring is stretched 0.1. If two identical bodies of mass m/2 are suspended from a spring with the same spring constant k, how much will the spring stretch? Explain your answer. The first case is when ...
March 12, 2015

physics for physical science
A stone thrown vertically upwards with a speed of 12m/s from the edge of Cliff 70m high. Calculate the time the stone takes to hit the bottom of the cliff.
March 9, 2015

algebra
The sum of two numbers is 70. One number is 10 more than twice the other number. Using Elimination find the numbers.
February 26, 2015

Physics
Two men of the same mass climb the same flight of stairs. The first man climbs the stairs for 25 seconds, while the seconds person takes 35 seconds. Which man does the most work?
February 26, 2015

English
Five sentence paragraph. To make a perfect turkey sandwich you will need, butter knife, turkey, cheese,mayo, lettuce, tomato and two slices of bread. Next, place the mayo evenly on both side of the bread. On one slice of the bread place the cheese,turkey,lettuce,and tomato. ...
February 21, 2015

Physics
A bike and cyclist have a combined mass of 75 kg. If the brakes can apply a maximum force of 20 N, what is the shortest time in which the cyclist can stop?
February 10, 2015

IPC
A hailstone traveling with a velocity of 43 meters/second comes to a virtual stop 0.28 seconds after hitting water. What is the magnitude of its acceleration in the water? a. 12 meters/second2 b. 1.5 × 102 meters/second2 c. 78.6 meters/second2 d. 6.5 × 10-3 meters/...
February 6, 2015

maths
-2(2x-5)(3x+1)
February 2, 2015

math
what is the total cost for 4 1/10 pounds of vanilla pudding? vanilla pudding=$7/lb
January 14, 2015

physics
The small piston of a hydraulic lift has a cross-sectional area of 3.6 cm2 and the large piston has an area of 86 cm2. What force F must be applied to the small piston to maintain the load of 52 kN at a constant elevation?
January 4, 2015

Algebra
1.33
December 10, 2014

Math
You own 80 mp3s. You plan to add 10 more songs every month. Represent this relationship to show how many mp3s you have for th nxt six months. What is the independent x varible?
December 10, 2014

Physics
.022
November 13, 2014

Astronomy
A simple temperature model for the solar nebula disk is Tdisk(a) = 20 � SQRT 100 AU/ a K, (1) where a should be expressed in AU in this equation. (a) Find the temperature in the solar nebula disk at the orbit of Mer- cury, Earth and Jupiter. (b) Where is...
November 13, 2014

Science Physics
How many Btu of heat must be added to 1200 lb of copper to raise its temperature from 100°F to 450°F -specific heat for copper is 0.092-
November 4, 2014

Specific Heat
Forgot to add specific heat for copper is 0.092
November 3, 2014

Specific Heat
How many Btu of heat must be added to 1200 lb of copper to raise its temperature from 100°F to 450°F
November 3, 2014

Science Physics
How many Btu of heat must be added to 1200 lb of copper to raise its temperature from 100°F to 450°F
November 3, 2014

Physics (heat)
A coal sample yields 1.25 X 10^4 Btu/lb. How many foot-pounds of work result from burning 1.00 ton of this coal?
November 3, 2014

Science Physics
600/9800
November 3, 2014

Science Physics
A lifeguard swims with her head just above the water. What is the volume of the submerged part of her body if she weighs 600 N? Would I need to divide by 9800 or 62.4?
November 3, 2014

Science Physics
A flat-bottom river barge is 30.0 ft wide, 85.0 ft long, and 15.0 ft deep. (a) How many ft3 of water will it displace while the top stays 3.00 ft above the water? (b) What load in tons will the barge contain under these conditions if the empty barge weighs 160 tons in dry dock?
October 31, 2014

physics
Bob, who has a mass of 80kg , can throw a 550g rock with a speed of 27m/s . The distance through which his hand moves as he accelerates the rock forward from rest until he releases it is 1.0 m. What constant force must Bob exert on the rock to throw it with this speed? If Bob ...
October 30, 2014

Fluid Mechanics Physics
A flat-bottom river barge is 30.0 ft wide, 85.0 ft long, and 15.0 ft deep. (a) How many ft3 of water will it displace while the top stays 3.00 ft above the water? (b) What load in tons will the barge contain under these conditions if the empty barge weighs 160 tons in dry dock?
October 29, 2014

Hydraulic Physics
thank you
October 29, 2014

Hydraulic Physics
So it would be 50.0/25.0*20.0=40
October 29, 2014

Hydraulic Physics
In a hydraulic system a 20.0-N force is applied to the small piston with cross sectional area 25.0 cm2. What weight can be lifted by the large piston with cross sectional area 50.0 cm2? Would I need to divide both pistons areas then mutiply the force? and or have gravity in ...
October 29, 2014

Fluid Mechanics
A flat-bottom river barge is 30.0 ft wide, 85.0 ft long, and 15.0 ft deep. (a) How many ft3 of water will it displace while the top stays 3.00 ft above the water? (b) What load in tons will the barge contain under these conditions if the empty barge weighs 160 tons in dry dock?
October 29, 2014

Fluid Mechanics
In a hydraulic system a 20.0-N force is applied to the small piston with cross sectional area 25.0 cm2. What weight can be lifted by the large piston with cross sectional area 50.0 cm2?
October 29, 2014

MATH (PROBABILITY)
According to Nielsen Media Research, approximately 52% of all U.S. households have digital cable television. In addition, 84% of all U.S. households have multiple TV sets. Suppose 45% of all U.S. households have digital cable television and have multiple TV sets. A U.S. ...
October 10, 2014

Chem 30 Thermodynamics
Your friend comes across a good deal to purchase a gold ring. She asks you for advice for you to test the ring. The ring has a mass of 4.54 g. When you heat the ring with 94.8 J of energy, its temperature rises from 23.0 degrees celsius to 47.5 degrees celsius. Would you ...
October 9, 2014

physics
Suppose that 1100 j of work is done by the force 30 n in moving the suitcase a distance of 50 m. At what angle is the force oriented with respect to the ground?
October 8, 2014

Physics (Force)
A power wheelbarrow has a mass of 432 kg. What force must be applied to give it an acceleration of 1.75 m/s2?
September 30, 2014

FRACTION CONCEPTS
I am a fraction whose numerator and denominator are both prime numbers less than 20. if you were to increase each term by 1, I would be equivalent to 1/2. what fraction am I?
September 23, 2014

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