Wednesday
October 26, 2016

# Posts by justin

Total # Posts: 916

art
The math tessellations: unit 4 1. The architectural design was created by: 1. using an organic pattern in the form of tessellation. 2. using a geometric pattern in the form a tessellation. 3. using no definite pattern and placing shapes randomly. 4. using patterns that ...
October 21, 2016

science
Which of the following can be used to explain why fossils of the same kinds of organisms can be found in different regions of the world? biogeography adaptation continental drift dispersal I think it is dispersal..but not sure..thank you for your help.
October 19, 2016

Biology 20
I'm using chromatography to identify compounds in a leaf extract for a lab, and one of the evaluation questions is 'Suggest a step that could be added to the procedure to isolate a specific compound for chemical testing.' What step could I use?
October 5, 2016

Math
You're given a fraction, 3/4-m. It's in your best interest to convert the whole number, 10-m, into a fraction. This can be thought of writing 10/1, and multiplying both the numerator, 10, and the denominator, 1, by 4. Once you have 10-m with the same denominator as 3/4...
September 29, 2016

Organic Chemistry
Oh you are right! One of my secbutyls had a different position for its branch. Thanks!
September 29, 2016

Organic Chemistry
Hi, I'm trying to fix an incorrect IUPAC name of a molecule. It is given as trisecbutylmethane, and I have to draw it out to correct it. Here's the thing: how do I draw incorrect IUPAC name? I can't wrap my mind around it. What I have drawn out is a tertiary carbon...
September 29, 2016

Calculus III
Topic: Quadric surfaces. I have two homework problems, and they are quite a doozy for me. So the point is, I am given details of a quadric surface on the Cartesian coordinate system, and thus have to use the data to construct an equation through it. ====================== Find...
September 18, 2016

PHYSICS
Ah, I initially thought you had too little information, but in fact this is theory (or should be). Depends, if you are neglecting dissipative forces like drag, this is quite easy. So in projectile motion (the arrow is a projectile), we like to separate our axes into their ...
September 18, 2016

math
Shalina uses the expression 3x to determine the cost of x notebooks. What is the cost of 24 notebooks?
August 23, 2016

General Physics
A 2.3 kg block is initially at rest on a horizontal frictionless surface when a horizontal force in the positive direction of an x axis is applied to the block. The force is given by F with arrow(x) = (2.6 − x^2) N, where x is in meters and the initial position of the ...
July 15, 2016

Physics
Five masses are positioned as follow in the x and y axis: m1 = 1 kg at (0,0) m2 = 2 kg at (4,0) m3 = 3 kg at (4,5) m4 = 4 kg at (0, 5) m5 = 5 kg at (2, 2) All x and y values are in meters. Find the magnitude and direction of the net gravitational force experience by m3 due to ...
July 13, 2016

Physics
A 4.0-kg mass is placed at (3.0, 4.0) m, and a 6.0-kg mass is placed at (3.0, -4.0) m. What is the moment of inertia of this system of masses about the x-axis?
July 7, 2016

General Physics
Clarification: this is calculus-based physics, so the methodology is not restricted to trigonometry only. I have two questions, so hopefully I can divide them up nice and evenly. Also, if you know where I should copy and paste proper vector notation from, please tell me so I ...
June 23, 2016

World History
Who names himself dictator during the late Republic and early Empire?
May 19, 2016

World History
How did the Punic Wars effect the Roman Army?
May 19, 2016

World History
Oh ya I think it is B but I am not sure.
May 19, 2016

World History
1. What island did Rome gain control of as a result of the first Punic War? A: Sicily B: Corsica C: Mediterranean D: None of the above
May 19, 2016

Math
Find the first 4 terms in the expansion of ((3x^4)-(2/y^5))^9
May 13, 2016

Science-Physics
As shown below, a 2.00 kg mass is connected to an unknown mass m via a massless rope and a massless, frictionless pulley. The mass m is on a ramp angled 20 degrees above the horizontal. The coefficients of kinetic and static friction are μk=0.35 and μs=0.45, ...
May 12, 2016

Pre Algebra (Math)
A certain animal can go for a long period of time without drinking water. When it does drink, its body weight can increase by 40%. Suppose the animal weighs 80 pounds after a long period without water. How many pounds can the animal gain when it drinks?
May 5, 2016

Physics
A 4.00-kg block rests on a 30.0° incline. If the coefficient of static friction between the block and the incline is 0.700, what magnitude horizontal force F must act on the block to start it moving up the incline, given g= 9.80m/s^2?
May 4, 2016

chemistry
If the water in 500mL of 0.44M NaCl solution is evaporated, what mass of NaCl will remain?
April 26, 2016

Calculus II
So I'm trying to integrate a function using partial fractions. Here is the integral of interest: ∫(3x^2+5x+3)/[(x+2)(x^2+1)]dx. Since the numerator's degree of the polynomial is lesser than that of the denominator's degree, it is clear to separate. However, ...
April 25, 2016

Calculus II
Is it possible to rewrite as: ∑(-1)^n[x^(2n+3)]/(2n+1)!
April 25, 2016

Calculus II
So I have Maclaurin series for sinx = ∑(-1)^n[x^(2n+1)]/(2n+1)!. I need to write out new series for sin(x^2). This will be equivalent to squaring the whole Maclaurin series of sinx, right? I'm just confused as to what terms are squared, and thus what the final ...
April 25, 2016

science
the solubility of an unknown substance is 120 grams of water at 70 degrees celsius. What is it?
April 20, 2016

chemistry
What is the molarity of the following solutions? A. 0.96 g MgCl2 in 500 mL solution B. 9.33 g Na2S in 450 mL solution C. 2.48 g CaF2 in 375 mL solution
April 7, 2016

chemistry
When 23g of C8H18 is combusted at STP, how many liters of carbon dioxide is produced?
April 3, 2016

Science /bio
Any foods or fruits highest in glucose?
February 28, 2016

Social studies
Nationalism ?
February 20, 2016

Art
Sorry I didn't read the question right it's D,right?
February 19, 2016

Art
Correct me I read the link and It said that they have supreme power
February 19, 2016

Art
what idea did the halos on the heads of Pichore's main subjects emphasize A) plentiful wisdom •• B) Exceptional power C) Divine connection D) extraordinary creativity Correct me
February 19, 2016

Chemistry
Sorry for the post-script but I had to add spaces and the parentheses so the picture album will upload. If this is just too unconventional then I apologize.
February 17, 2016

Chemistry
Okay so I understand this is incredibly unconventional, but I have a big favor to ask. I just got a chem exam back and my teacher still has not posted my scantron score. I was wondering if it is at all possible for you guys to just spot-check for accuracy. It can be rough or ...
February 17, 2016

Math
Find two numbers which have a sum of 2 and a product of 2. This question is driving me crazy, please help!!
February 15, 2016

math
In which quadrant does the angle Θ lie given that Cos Θ > 0 and tan Θ > 0? A. Quadrant I B. Quadrant II C. Quadrant III D. Quadrant IV B?
February 12, 2016

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

U.S. History
what did Rousseau mean what he started that if any individual wants to pursue his own self-interests at the expense of the common good,"he well be forced o be free"? do you agree or disagree with Rousseau's Ideas
January 4, 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

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