Thursday
July 31, 2014

Posts by David


Total # Posts: 1,620

Stastistic
Finde the mean , variance , standard deviation N-127, P=0.66

math
Frank's cell phone package costs $20 per month and an additional $0.05 per text. Josie pays $15 per month and $0.10 per minute. Determine the linear system that could be used to find out when their monthly bills would be the same.

MATH
Find the amount of interest and the monthly payment for the loan. Purchase a living room set for $3,800 at 12% add-on interest for 3 years.

statistics
Surgery vs. placebo for the knee pain: Refer to Example 10. Is Arthroscopic Surgery Better than Placebo? Here we show MINITAB output comparing mean knee pain scores for the placebo (group 1) to debridement arthroscopic surgery (group 2). a) State and interpret the result of th...

Physic
What are some sources of energy that are available to heat the interiors of planets?

science
2 WAYS TO DETERMINE THE INTERIOR ARE GRAVITY, AND SEISMOLOGY.

Science
How can we use Kepler's laws or Newton's laws to learn about these objects?

Astronomy
How were the different objects in the solar system discovered? What are the properties of the ice giants?

Physic
alive

calculus
How do I take the partial derivative of P with respect to r of the following: D ~ P = ‡”(t=1 to T)[t ~ (CF)_t/(1+r)^t ]

math
5x-y=22 x+9y=32

Physics?
In Rutherford's scattering experiments, alpha particles (charge = +2e) were fired at a gold foil. Consider an alpha particle, very far from the gold foil, with an initial kinetic energy of 2.0 MeV heading directly for a gold atom (charge +79e). The alpha particle will com...

math
5040

Alg/Trig
(x-2)^2 + (y-3)^2 = 4.5^2

math ( pre algebra )
B. H

math
nonsense. let the three batteries by A,B,C then A = 2B 3A = C A + B + C = 54 so A = 12 B = 6 C = 36

math
How do I take the partial derivative of P with respect to r of the following: D × P = ∑(t=1 to T)[t × (CF)_t/(1+r)^t ]

Algebra 2
Thanks Ms Sue its my daughters problem ,my responce was maybe the wording might be asking "what investment " might be what amounts in what types of investments would yield the $4ooo. Or it might be just be about the math and analizing it. Either way ,thank you

Algebra 2
As a graduation present, you want to gift your son a trip to Disney World. Presently beginning his second semester as a high school junior, you hope you have enough time to save $4,000 to support much of the trips expenses for your child and two of his closest friends. Rather ...

english/grammar
I need help editing errors in parallelism in the following sentence: Is it true that Superman could leap tall buildings, run faster than a locomotive, and that bullets would bounce off his skin?

grammar
ops whats the first one

grammar
Whats the last one?

physics
or I've kept up with my homework and work this whole year except that our teacher just randomly decided to give us a ton of homework this weekend, and I have done all I can do. All of my friends are in the physics 1 class while this is physics 2 so no I cannot have answers...

physics
Hi, my teacher doesn't teach us too well and we have a few packets to hand in for tomorrow that I really don't understand much of. If someone could give me the answers to all of the problems on the first link if you search "the electrical energy converted to therm...

Geometry word problem
A rectangular pond is 10m longer than it is wide. A walk 2m wide surrounds the pond. Find the dimensions of the pond if the area of the walk is 216m2

Geometry
A rectangualar playground is 4 meters longer than it is wide. If the length is increased by 5m, and the width decreased b y 1 m, the area is increased by 15m SQUARED(15M2).Find the original dimensions of the playground.

Math
How do i solve 2x+y > -3? And how do i graph it. This is Linear inequalities.

phisycal sciences
Which of the following properties did Rutherford use in his experiment? A. the negative charge of the alpha particles and the random distribution of protons B. the negative charge of the alpha particles and the positive charge of the gold foil C. the positive charge of the alp...

Mathematics
Two numbers have thousandths other than zero. Could the difference of these numbers be 5.3? Explain.

algebra 2
Write an equation for a parabola with vertex at (3,- 6) and focus at (3,- 4).

chemistry
Is beta particles the answer?

chemistry
Which radioactive emanations have a charge of -1? beta particles alpha particles gamma rays neutrons

Algebra
-4x+1-2(x-1)= -4(x-4)

algebra
Write an equation of the hyperbola with foci (0, ) and (0, 2) and vertices of (0, ) and (0, 1).

spanish
Escribe el cual (la cual, los cuales, las cuales) o lo cual en el espacio. Nos invitaron a cenar con ellos, ____ fue una buena idea.

spanish
¿Cuál frase es correcta? El hijo del maestro, quien estuvo en mi clase, es muy inteligente. El hijo del maestro, a quien estuvo en mi clase, es muy inteligente.

algebra
When you spend $1 at the grocery store, the store doesn’t keep all of your money as profit. Some of it is reinvested in the economy when the grocery store buys more merchandise from suppliers. In turn, the suppliers don’t keep all of that money as profit, either; the...

Finance
Calculate the weighted cost of equity for a firm with the following characteristics: (a) Last Dividend--$5.00, (b) Growth Rate—6%, (c) Price of Stock--$125.00 and (d) Weight of Equity Capital—40%

English
Help me to write these answer question, Write an essay that illustrate the saying every cloud has a silver lining in 340 words

American Lit.
What is Fundamentalist-Modernist Controversy.? Is this one whole topic or more than one.?

computer programming
Make an Maplet that does the simple calculator funtions as addition, subtraction, multiplication, division, factorial, sin(), cos(), tan(). (using maplet in maplesoft)

physics
a one meter chain that weights one newton sits on a flat horizontal table that is one meter from the floor. the coefficient of friction between the chain and the table is 0.15. how much of the chain can dangle off the table until the chain pulls itself onto the floor? if it st...

College Algebra
log5 (x+2)+log5(x-2)=3

algebra
2(2x+5)-7<12 2(2(-5)+5)-7<12 2(-10+5)-7<12 2(-5)-7<12 -10-7<12 -17<12

geometry
A circle of radius r is centered at the origin and a rectangle is inscribed. The area of the rectangle as a function is given by what? Can you also explain the processes behind finding the answer it helps me understand.

Environmental Science
7 is D 10 is probably B because mosses are the first thing to grow naturally after the destruction of an environment like building a building 21 is D the y all effect marine ecosystems and are caused by humans 27 is D

Chemistry
Calculate the Concentration of Ni2+ in a soltion which prepared as mixing 50.0ml 0.0300 M Ni2+ and 50.0mlml 0.0500 M EDTA at pH= 3 At pH=3 , α4= 2.5x10-11 KNiY=4.2x1018

Chemistry
calculate the the pH of a buffer solution containing 0.246 M NH3 and 0.0954 M NH4Cl (for NH3 Kb = 1.74x 10-5)

Chemistry
what mass of AgBr is formed when a solution containing 3.45 g of KBr is mixed with a solution containing 7.28 g AgNO3?

chemistry
You have a 1 L container of a gas O 2 at 20°C and 1 atm. Subtracting the weight of the container, what is the mass of the gas?

physics
A truck covers m in 8 s while smoothly slowing down to a final speed of 2.8 m/s. (a) Find its initial speed. (b) Find its acceleration.

Chemistry
How many grams of water are formed when 250 mL of 2.0 M Mg(OH)2 are neutralized by a solution of HCL ?

Chemistry
How many mL of 3.0 M HCL are required to neutralize 250 mL of 2.0 M MgCL2 ?

MaTh AlgeBRA
Do synthetic division or long division Domain is all reals except x=1 because it gives you a 0 denominator.

Calculus
Let (3,1,-2) = C A+B=C B=C-A B=C+(-A) Do the addition component by component.

Chemistry
Both compounds are soluble, thus you have a double replacement reaction. Do stochiometry with the balanced reaction to find the concentrations.

Physics
Because of the symmetry in the path of a projectile, it will return to your hand with a speed of 40 m/s downward. Its total displacement is 0 since it returns to starting position. To find the distance traveled, multiply the height it reaches by 2. Find the height using kinema...

Physics
Assuming the angle of the throw was perfectly horizontal, x=v0*t=10*4=40m

physics
x=Vo*t since no forces act on the car in the x direction. Solve for t, t = x/v0^2 y=Vo*t+at^2/2 in this case, y = h, Vo in the y direction is 0, a = -g and use the relationship from before. Substitute solve for Vo^2 and your all done

math
x+x+3=57

Algebra II
x1/y1=x2/y2

conics
slope of PO= y/x slope of PN = y/(x-12) For segments to be perpendicular their slopes must be negative recipricols Thus, -x/y=y/(x-12) y^2+x(x-12)=0 Distribute the x, complete the square, and then you'll have the equation of a circle.

math
Draw a quadrangle below.Measure the sides to the nearest 1/2 inch.Write the length next to each side.Find the perimeter.

physics
Howstuffworks has a pretty thorough yet comprehensible explanation. I'd check that out.

CHEM
if something has a pH of 3.72 its not a base... did you mean pOH?

physics
T is period so you have frequency and period backwards

physics
use the formula T = 2*pi*sqrt(L/g) make sure you use SI units.

physics
Use the relationships 1 watt = 1 Joule / second E = mc^2 E = energy, m = mass, c = speed of light (3*10^8 m/s)

physics
you need to know that relationship that in that form, w = 2*pi*frequency thus w = 2*pi*525 2)cycles per 1 minute = 60 seconds *frequency = 60 * 535

math
13*3=39

math
6*10 + 10*(1/2) = 65

trig
Cosine is 0 at pi/2 3pi/4*t=pi/2 t=2/3

physics
w = 2*pi*period

physics
nevermind I thought it said that it began at its highest point. Since they didn't specify any initial conditions you're free to use either sin or cosine with no phase shift.

physics
It doesn't make a difference as long as your value for when t = 0 is correct since sin is just cosine phase shifted by pi/2. Cosine is probably easier in this case because then you wont need to do a shift.

physics
Period = time per cycle = 15 seconds frequency = 1 / period = 1/15 hz amplitude= 3 ft because its actually the distance from the center to each side. from there just put it into standard form.

Chemistry
It depends on the indicator. At the equivalence point, hypothetically they are equal. Most indicators however do not change color at exactly 7 and thus pH of the endpoint determines the concentrations of H+ and OH-

Physics
If the bus is moving with constant velocity, there's no net force on the bus, and thus you don't need to compensate for the bus's motion. If the bus is moving forward with constant acceleration, there will be a force pushing the bus forward, however from inertia yo...

math
total time = 4 hours + 3 hours = 7 hours. Avg speed = total distance / total time Avg speed = 40 * 2 / 7 = 80/7 km/h

math
total distance = 526 + 5 * 70 avg speed = total distance / 12 min

science
Pv=nRT for both the initial and final state. Only thing your changing are temperature and since moles, R and volume are constant pressure must change. Thus P1/T1=P2/T2 P2=P1*T2/T1

Calculus
Volume=s^2*h=32 Surface area = s^2 + 4*s*h using volume equation, h=32/s^2 SA= s^2 + 4*s*(32/s^2) = s^2 + 128/s Take derivative dSA/ds and set equal to zero. 2s - 128/s^2 = 0 s^3 = 64 s = 4

Economics
D Rule 1 of microeconomics The optimal quantity for essentially everything is where marginal revenue = marginal cost

Physics
sum of forces vertical = 0 = mg - Ncos@ sum of forces horizontal = mv^2/r = Nsin@

math
to divide by a polynomial with power other than 1 you have to use long divison. However for this problem that's not necessary... just factor G(x) = (x-2)(x-3)/(x-3)(x+3) thus your only zero is x = 2 since the function is not defined at x = 3

Chemistry
Explain why the absolute values of the standard enthalpy change in the reaction and heat measured by the calorimeter are not equal. Assume that there are no measurement errors of any kind. In the previous problem I solved that Delta H rxn was -1500 and q = 1.519 x 10^6 J and I...

Chemistry
For the following reaction, the equilibrium constant Kc = 97.0 at 900K. If the initial concentrations of NH3 and H2S are both 0.20 M, what is the equilibrium concentration of H2S? H2S(g) + NH3(g) = NH4HS(s) Would you have to create an ICE chart for this type of problem?

Chemistry
The equilibrium constant Kp for the following reaction is 4 atm^2 at 300 K. AB(s) = A(g) + B(g) What is the equilibrium pressure of A(g) and B(g) above AB(s) at 300K? What is Kc at 300K? How would i solve this when they don't even give me any partial pressures?! All of the...

Chemistry
oh wow........ :[ thanks Dr. Bob

Chemistry
Which of the following statements are incorrect? 1) Gases are not included in the equilibrium constant expression. 2) Equilibrium constant can be increased by adding a catalyst 3) Large equilibrium constant favors reactants 4) Equilibrium is typically achieved in a very short ...

algebra
describe the number tha make the statement true: 3-16>23

Chemistry
The equilibrium constant Kc for the following reaction is equal to 0.20 at 250°C. Calculate the equilibrium constant Kp for the reverse reaction at the same temperature. COCl2 (g) = CO (g) + Cl2 (g) I'm sorry.. English is a second language for me. After solving for K&#...

english
Identify the capitalized part of speech in the following sentence: You should be proud of him, FOR he's a "jolly good fellow." Answer a. noun b. pronoun c. verb d. adjective e. adverb f. preposition g. conjunction .

physics
A simple pendulum has a mass m and carries a charge q. The pendulum is suspended between the vertical plates of a capacitor of separation distance d. If the string of the pendulum makes an angle θ with the vertical, what is the potential difference between the plates

physics
A simple pendulum has a mass m and carries a charge q. The pendulum is suspended between the vertical plates of a capacitor of separation distance d. If the string of the pendulum makes an angle θ with the vertical, what is the potential difference between the plates

math
Having difficulty with the four frequency ,to use in a table and determine and find the range ..im not understanding whays needed ?

physics
A simple pendulum has a mass m and carries a charge q. The pendulum is suspended between the vertical plates of a capacitor of separation distance d. If the string of the pendulum makes an angle θ with the vertical, what is the potential difference between the plates

english
Identify the subjects of the following sentences. Jacob's favorite poker game is Texas Hold'em

Art
What are the six architectural features of the Chartres Cathedral?

Chemistry
why does the equil end up being 0.8-x instead of 0.8 - 2x? and i solved for x but it gave me 2 different answers did I do something wrong?

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