Tuesday
July 26, 2016

Posts by alex

Total # Posts: 3,464

Physics
htt p://i .imgur. com/mXYFaDV .png this is the link, delete the spaces. Are any of these options correct?
July 18, 2016

Physics
Ok so this is just a small understanding problem, I do not want you to actually help me solve the problem, here it goes: A cylinder with mass 3kg slides on ice with its base surface at 5m/s and collides with an identical but stationary cylinder. The collision is elastic. After...
July 18, 2016

arithmetic sequence
find the 9th term of the arithmetic sequence with Asub1=10 and =1/2
July 6, 2016

arithmetic sequence
give the sequence of 5 term if the first term is 8 and the last term is 100
July 6, 2016

Chemistry
How much energy is released when 2.50g of NH3 rxs with excess N20 given the following 2NH3+3N2O -> 4N2_3H2O; DELTA(H)=-1010KJ. Please give work and setup :)
June 26, 2016

Chemistry
a 2.00 g sample of C6H402 is burned in a calorimeter whose heat capacity is 8kj/C. The delta T is +7.13 degrees C. What is the enthalpy change per mole?
June 26, 2016

math
Arley’s Bakery makes fat-free cookies that cost $1.60 each. Arley expects 40% of the cookies to fall apart and be discarded. Arley wants a 35% markup on cost and produces 200 cookies. Assume that Arley can sell the broken cookies for $1.50 each. What should Arley price ...
June 20, 2016

Pre cal
If Joe invested $7000 at x% and $13,000 at 3% more, find x if the income from both investments is $1190 I'm thinking that the equation would r something like 1,190=(13,000)(.03) but please correct me if I'm wrong. Thank you for your assistance.
June 6, 2016

MATH
Answer=EGG
June 1, 2016

MATH
THOSE WERE THE INSTRUCTION(THIS IS THIRD GRADE MATH)
June 1, 2016

MATH
EACH LETTER IN EACH ADDITION PROBLEM STANDS FOR A NUMBER BETWEEN 0 AND 9.NO TWO LETTERS STAND FOR THE SAME NUMBER IN EACH QUESTION. FIND THE VALUE FOR EACH LETTER.FOR EACH PROBLEM, USE THE NUMBERS IN THE BOX NEXT TO THE PROBLEM. T E N (5,6,1,2,7) + O N _________
June 1, 2016

Algebra
For f(x) = 0.01(2)x, find the average rate of change from x = 2 to x = 10.
May 19, 2016

math
sally's cell phone company charges a flat rate of $15.00 per month and $0.12 per minute. eduardo's cell phone company charges a flat rate of $18.00 per month and $0.09 per minute. how many minutes would you have to use for the price to be the same for both plans?
May 18, 2016

Chemistry
How many grams of solute are required to make a 976 mL solution of sodium hydroxide with a concentration of 0.0783 M?
May 16, 2016

Linear Algebra - urgent!
A is a diagonalizable matrix. It has the characteristic polynomial det(lambda*I-A)=(lambda-c)^n. Prove that A=cI.
May 10, 2016

math
florence bought two bags of flour, A and B. the two bags contained different amounts of flour. the total mass was 108 kg. Gary poured 1/4 of the flour from bag A to bag B. After that, he poured 2/5 flour from bag B to bag A. he found that the both bags had the same mass now. ...
May 10, 2016

math
Distribute the 3, combine like terms, then isolate the variable. -6t + 3t - 6 + 5t = 8 2t - 6 = 8 2t = 14 t = 7
May 9, 2016

math
Sample mean and population mean are the same for normal distributions.
May 9, 2016

math
Yes.
May 9, 2016

Math
Any polygon's total angle can be found by the formula (v - 2) * 180, where v is the number of vertices. In your problem, we have a 7-sided polygon, so v = 7. The total angle is 900. The 6 interior angles of 125 sums to a total of 750, so the seventh, unknown angle is 900...
May 9, 2016

Linear Algebra
A is a diagonalizable matrix. It has the characteristic polynomial det(lambda*I-A)=(lambda-c)^n. Prove that A=cI.
May 8, 2016

Chemistry
What is the maximum mass(g) of KCL that can be added to 1.00L of a 0.0100 M lead(ii) chloride solution without causing any precipitation of PbCl2? Assume the additional KCl does not affect the volume of the solution. For, PbCl2, Ksp=1.6x10^-5 Personally I'm at a loss here...
May 5, 2016

Physics, Math
A helicopter is in a level flight with an altitude of 4000 feet and a speed of 130 feet/sec. The helicopter drop a bomb with 0 speed relative to the helicopter. How far does the bomb travel horizontally from the launch point to impact with the ground?
May 5, 2016

Calculus - urgent
A lamina. defined by y>=0 with edges y=0, y=3/2(1-x^2) and x=-y+2y^2, for which the density is given by p(x,y)=y. a) define domain as union of type 1 and type 2 region. b) Calculate mass of lamina.
May 2, 2016

Physics
A 100 kg block is hanging from a frictionless pulley with another block of unknown mass on the other side of the pulley. It is released from a height of 1 meter above the ground. It then takes 0.9 seconds to reach the ground. What is the weight of the other mass? Thanks for ...
May 1, 2016

Physics
A 100 kg block is hanging from a frictionless pulley with another block of unknown mass on the other side of the pulley. It is released from a height of 1 meter above the ground. It then takes 0.9 seconds to reach the ground. What is the weight of the other mass?
May 1, 2016

Calculus
The videos did help but i still have trouble setting up the integrals. Since this is part of double integrals section in my course... i'm trying to do it in the form of double integrals. Is this correct? Outer integral is from -pi/2 to pi/2 Inner is [r dr d(theta)] from 3*...
May 1, 2016

Calculus
A cardioid r=1+cos(theta) A circle r=3*cos(theta) a) Define the domain of the region enclosed inside both the cardioid and the circle. b) Use polar coordinates to calculate the area. (We can use symmetry about x-axis)
May 1, 2016

Physics
Three objects are connceted by a massless wires over a frictionless pulley. The right side of the pulley wire is connected to a 15kg block and right below that is a 10kg block on the bottom of the wire. The tension in the wire connecting the 10kg and 15kg objects is measured ...
April 30, 2016

Physics
A 100 kg block is hanging from a frictionless pulley with another block of unknown mass on the other side of the pulley. It is released from a height of 1 meter above the ground. It then takes 0.9 seconds to reach the ground. What is the weight of the other mass?
April 30, 2016

Physics
Thanks a bunch Bob Alex
April 30, 2016

Physics
A 50 Kg box rests on a horizontal surface. The coefficient of Static friction between the box and surface is 0.30. The coeffient of Kinetic friction is 0.20. What is the frictional force on the box if a 140 N horizontal push is applied to it. If a 175 N horizontal push is ...
April 30, 2016

Math
The rectangular backboard of a basketball court needs to be assembled. Its area is given as 18,900 cm2 and the width as 1.8 m. What is the backboard’s length in metres? m
April 30, 2016

Chemistry
A gas occupies a volume of 4.64 x 102 mL at 519.57 mm Hg pressure. What will be its volume, at constant temperature, if the pressure is changed to 764.71 mm Hg?
April 27, 2016

Math
how to find out length of a rectangle area given 18900cm'2 width 1.8 what is length in metres
April 27, 2016

Math
Its area is given as 18,900 cm2 and the width as 1.8 m. What is the backboard’s length in metres? m
April 27, 2016

Math
Our parent function for log is log (x), so how does your function differ? 1) The leading negative sign. This reflects rhe function across the x-axis. 2) The (2 - x) inside the log function. Note that this is actually two transformations because 2 - x is equivalent to -x + 2. A...
April 27, 2016

Emergency Easy QUESTION
It depends on the colleges you're looking at and the high school you are attending. Colleges like to see rigor on your transcript so, if the college is very prestigious and your HS offered a lot of rigorous classes-- AP, gifted, honors, dual enrollment, etc.-- that might ...
April 27, 2016

English Grammar
Yes, that seems right to me. "I was referred... job," is a simple subject-verb-noun construction, "by... supervisor" is an adjective prep phrase describing "job opening," "John Smith" is the essential appositive, and the rest is ...
April 27, 2016

science
What are the answer choices?
April 27, 2016

L.A.
Yes I meant L.A. I have no idea why I put Math. But thank you so much you helped me a lot!
April 27, 2016

Math
When Scrooge tells Marley that Marley was always “a good man of business,” in Act 1, Scene 3 of A Christmas Carol: Scrooge and Marley, Marley responds, “BUSINESS!!! Mankind was my business. The common welfare was my business; charity, mercy, forbearance, ...
April 27, 2016

Math
In order, these equations are: 1) .25x + 40 2) .40x + 25 Where the charge per minute is the slope, the flat rate the y-intercept. We want to know for what number of minutes these two plans cost the same, so set equations (1) and (2) equal to each other and solve for x.
April 26, 2016

algebra
Yes. A polynomial can have, at most, a number of zeroes equal to it's degree. A third degree polynomial can therefore have three zeroes, however, Ray is arguing that the polynomial has four INTERCEPTS. While the terms "zeroes" and "intercepts" are often...
April 26, 2016

Linear Algebra
Let T : Rn-->Rn be a linear transformation, whose standard matrix is invertible. Show that if B = {v1, . . . , vn} is a basis for Rn, then {T(v1), . . . ,T(vn)} is also a basis for Rn.
April 26, 2016

English
Because that's an arrogant, Anglo-centric point of view?
April 25, 2016

Calculus
This is actually a related rates question, so you want rates of change: so the rate of change of volume, the rate of change of surface area. This is represented as the derivative, but before you go finding the first derivative, think on how you should use the change of radius ...
April 25, 2016

Calculus
X and Y move perpedicular to each other, forming a right triangle. As such, the distance between the cars is sqrt(X^2 + Y^2), where X = +50 km/hr, Y = +60 km/hr. (These are functions.) We want the RATE at which these cars are seperating, so take the first derivative of the ...
April 25, 2016

PreCal
This set is numbers strictly greater than 2. Because this relation is strict (> instead of >=), the left interval is a parens. There is no upper bound, so the right interval is infinity. (2, +INF)
April 25, 2016

PreCal
That the price "dropped steadily" implies a linear relationship, which would simply be change in price over change in time. (140 - 90) / 5 = -$10 / week.
April 25, 2016

Math
Follow order of operations. In the first parens, 33 + 19 = 52. The second parens is 51. Our expression is now 52 * 2 * 51. Multiplication is associative, so it doesn't matter which order we do this in. My calculator gives me 5304.
April 25, 2016

Algebra
I'm getting D.
April 25, 2016

cs 2
Which part of this assignment are you having trouble with? The logic? Or File I/O?
April 24, 2016

statistics
The problem wants the test statistic for a one-proportion z-test, which we know because we're only given data for 1 test and that "492 / 806" implies a proportion. The sample statistic for this test is given by sqrt(pq / n). p = 492/806 (probability of success) q...
April 24, 2016

statistics
So the population distribution-- the distribution of ALL M&Ms-- is given in the problem: N(0.8565, 0.0518). However, we want to know what the mean weight will be if, instead of pulling from ALL M&Ms, we "randomly select 465 M&M plain candies." This is our sample. ...
April 24, 2016

statistics
You are given a normal distribution of a population. You want to know things about a sample distribution, so you should start with constructing a normal distribution for your sample of 465 M&Ms. The mean of this sample remains the same. The standard deviation is the population...
April 24, 2016

statistics
The normal distribution is N(25, 10). P(X > 20) = .691 So approximately 69.1% passed the exam. 69.1% of 100 students is 69 students.
April 24, 2016

geometry (check my answers)
All statements are true. A rectangle simply requires that a four-edged figure has 4 right angles and two sets of parallel lines. A square is a special case-- that all four sides are the same length, but it's still a rectangle. The rest of your answers are correct. :-) It ...
April 22, 2016

math
What's the question?
April 22, 2016

physics
Er, what's the question?
April 21, 2016

math
y = -x + 8. (7, 1) corresponds to (x, y), so just plug in the values into the equations and see which one works. For the above equation, 1 = -(7) + 8 1 = 1 This is true, so this is indeed the correct equation.
April 21, 2016

math
Yes, quadrant IV is correct. :-)
April 21, 2016

Sampling Distributions
A - The sample standard deviation is the population standard deviation over the square root of the sample size, 30 / sqrt(36). The mean of an approximately normal sample distribution is the same as the population mean, so the sample distribution is N(360, 5). B - If you want ...
April 21, 2016

stat
We construct a binomial distribution. The probability of "success" (a substandard rod) is .05. We have 300 trials. B(.05, 300) P(X < 20) = .881
April 21, 2016

Physics
First convert your angular speed from rpm to rad/s. You can then convert your angular speed to tangential speed with v = omega * r. (Be sure to convert that diameter into SI units!) Newton's second law gives us F = ma, where this is centripetal acceleration, so F = (mv^2)/...
April 21, 2016

math
Sure, sounds good to me. :-)
April 21, 2016

math
I don't understand the question?
April 21, 2016

Bio
Because unique identifiers mean that, given a name, someone could find out about the organism. If we had two things with the scientific name "cat," that would be a problem-- there are tons of cats. But since no two species of cats have the same two names, given a ...
April 21, 2016

Bio
Ah, but each scientific name is unique. Chip brand names may be ridiculous-- Lay's, Doritos, Cheetos, etc.-- but they're unique so they still serve as good identifiers. (Can you tell I'm sitting next to a vending machine?) (Fun fact, ursus is also Latin-- most ...
April 21, 2016

Bio
D. All scientific names identify an organism's genus and species. Usually this name is Latinate (interesting-ish story involving Linnaeus), though it doesn't have to be.
April 21, 2016

Geometry
That's not a math error, that's a conversion error. Answers are in yards, lengths are given in feet. Cheap trick-- I just noticed it myself.
April 21, 2016

Geometry
Are you told that this is a right triangle? If you aren't, you'll have to law of cosines for the length of the third side. You could then Heron's for the area.
April 21, 2016

Statistics
I would say A, though that's because I was taught an 8-part procedure for hypothesis testing, and B - D are their own separate steps. It does make sense that you'd define your hypotheses in the hypothesis step, though, and you really shouldn't be calculating the ...
April 21, 2016

Educational Technology
I agree with all three of your answers. :-)
April 20, 2016

Language arts
Without the passage, it's difficult to discern anything about questions 1-3. 4, however, should be D. The way the sentence is set up is to imply a contradiction, something like "Geese usually fly in a V formation but they aren't today." Unpredictable ...
April 20, 2016

Math
Here, let's define "success" to be that the plant doesn't grow. This would be 1 - .6 = .4. We construct a binomial distributions with 6 trials (6 seeds planted). We want 4 events. B(6, .4) P(X = 4) = .138
April 20, 2016

HELP PHYSICS PLS :)
This is a perfectly inelastic collision, so we know that energy is conserved. (Good job identifying the problem!) Assuming you choose your "0" PE point to be the bullet's initial height: E(i) = E(f) .5m(bullet)v(bullet)^2 = m(tot)gh(system), where h is the height...
April 20, 2016

Math PLZZZ HELP!!!
I'd go with the second and third choices. That the scatter plot has a positive trend tells you that you have a line of best fit with a positive slope. This satisfies both the second and third statements. The first answer assumes that all points on the graph fall exactly on...
April 20, 2016

Math
Multiply both sides of the inequality by 2. x <= -30, which is D.
April 20, 2016

Math
Are you sure that's all the data and that you typed that data in correctly? I haven't thrown this into my calculator, but just by observation, the range would be 27 - -52 = 79? None of those choices are correct if that's your complete data... (If you have to pick, ...
April 20, 2016

Physics
Let's start by converting everything to SI units. 15 m/hr/s = 6.71 m/s/s 65 m/hr = 29.1 m/s We have constant acceleration, so we can use our constant acceleration kinematic formulas. Here we initial velocity, final velocity, acceleration, and want time so we use v(f) = v(i...
April 20, 2016

Statistics
The probability of our event occurring is .8. We construct a binomial distribution, with 4 trials, of which we want 3 to occur. B(4, .8) P(3) = .4096
April 19, 2016

Math
Multiply both sides by 3729, yielding 3729tan(7)
April 19, 2016

Math
Actually, wait. You should be using tan, since you're given the adjacent side. (The lesson here: always draw a picture.) 120tan(36).
April 19, 2016

Math
The transit here is extraneous information-- it's simply a device used to measure angles (I assume). We know that the base of the right triangle is 120 feet. (Notice that the transit of 8ft is nonsensical in this problem doesn't make sense because we're solving for...
April 19, 2016

Math
Perimeter is the sum of all sides. For a rectangle, P = 120 = 2L + 2W. You are given that L = 3n W = n, so you can now do a substitution into the perimeter equation: 120 = 2(3n) + 2(n). Simplifying this, we get 120 = 8n, so n = 15. Revisiting our length and width equations, L...
April 19, 2016

Math
1/15.5 = 2/31
April 18, 2016

computer science
What specific part are you having trouble with? The packages? File I/O? What language?
April 18, 2016

calculus
Between y = 2x2 + 9x − 4 and y = −x2 + 6x + 2 for x in [−2, 2]
April 18, 2016

Language Arts
You are correct. :-) A conjunction joins two parts of a sentence together. A better example to describe this would be "Alice bought a calculator, and Ben bought a mouse." The conjunction "and" divides the sentence into two thoughts-- "Alice bought a ...
April 18, 2016

math
Set up a proportion: If Bill can type 10 pages in 24 minutes and we want to know how many pages he can do in 5.5 hours (330 minutes), a possible proportion is: 24/10 = 330/x Cross-multiplying we get 24x = 3300, so x = 3300/24 = 138 pages.
April 17, 2016

Algebra
The easiest way to justify this is to visualize the graph. We know from the first the signs of this equation that this quadratic opens upwards and know that it is shifted to be above the x-axis, so the quadratic never crosses the x-axis and therefore has no roots. You could ...
April 17, 2016

Math grade 7
Net daily change is revenue - expenditures, 12500 - 15000 = -2500. The overall change in the treasury's funds is 1.1Mil - 1Mil = 100K. To find out how many days, we divide the overall change by the net daily change in revenue: 100K / 2500 = 40 days.
April 15, 2016

Translating a sentence into a one-step equation
60 = v - 13
April 15, 2016

Algebra 2
If it's multiple choice, plug and chug those points. Otherwise, you have two options: 1) Quadratic Regression 2) Conics I opt for quadratic regression given that I've not done conics in three years, lol f(x) = -x^2 + 5x -4
April 15, 2016

Translating a sentence into a one-step equation
g + 17 = 46
April 15, 2016

Reverse math confused
Her preliminary cost (prior to tax and tip) is regular price (p) - 2. Tax and tip is 20% of this preliminary cost, so total cost is 9 = 1.2(p - 2). p = $9.50. (Nice coupon, there...)
April 15, 2016

Math
We know that after cutting 1/3 of the coil and 8m of the coil, 1/2 of the coil remains. This can be written as 1/3 + x = 1/2, where x will be 1/6. We know that this 1/6 of the coil is 8m, so the total length of the coil is 8 * 6 = 48m because one coil = 6 subcoils each of 8m.
April 14, 2016

physics
Where is Q located? I'll explain how to do this, since I don't know enough about this problem. Solve for the the bob's velocity right before it hits ball Q using energy equations: U(bob) = KE(bob) + U(Q). From here you can use your elastic equations to solve for ...
April 14, 2016

math
The volume of the tank is 3885 cubic centimeters. Volume is equivalent to length * width * height, in which you are provided both length and width. Your equation becomes 3885 = 18.5 * 15 * height Solving this, we get height = 14 cm.
April 14, 2016

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