# Posts by Alex

Total # Posts: 3,749

**chemistry**

How many mL of 0.6 M H2SO4 solution are needed to react completely with 23.62 g of Fe2O3 in the following reaction?

**maths**

Three boys earned a total of 235.50.What was the averge amount earned per boy

**Physics**

A woman stands on a bathroom scale in a motionless elevator. When the elevator begins to move, the scale briefly reads only 0.70 of her regular weight. 1).Calculate the magnitude of the acceleration of the elevator. Express your answer to two significant figures and include ...

**Social Studies**

Thanx connection students

**Social Studies**

a cd b c c c b b d a

**World History**

hey nikki im also in connexus maybe we could sometimes help each other if u have kik or skype thatd be cool

**Math, ratio, part to part ratio etc...**

There were 40 students per bus for the field trip

**Math**

Four more than twice Jason's age is the same as his age ten years from now. How old is Jason now?

**Social Studies**

i need help on this to

**algebra**

- 1/3 chance of choosing an O, as there are 6 letters in "school" and 2 of those are O's. 2/6 = 1/3

**algebra**

mary had 150 buttons more than gary at first. after mary used 190 buttons gary now has twice as many buttons as mary. find the number of buttons mary had at first.

**algebra**

mary had 150 buttons more than gary at first. after mary used 190 buttons gary now has twice as many buttons as mary. find the number of buttons mary had at first.

**PE**

100% THANKS :)

**algebra**

You also have two options for lodging. Write an equation FOR EACH OPTION that depicts the total cost of your stay, y, based on the number of days, x. Bilton Hotel: $100/night but you must pay an additional one-time fee of $40 for parking and other fees Triple Tree: $110/night ...

**statistic**

A survey found that women's heights are normally distributed with mean 62.5 in. and standard deviation 2.7 in. The survey also found that men's heights are normally distributed with a mean 67.9 in. and standard deviation 2.8 . Complete parts a through c ...

**Physics**

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

**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...

**arithmetic sequence**

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

**arithmetic sequence**

give the sequence of 5 term if the first term is 8 and the last term is 100

**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 :)

**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?

**math**

Add all the numbers up but pay attention you are counting 6.30 twice. then you divide by the numbers of days you have.(5) Your answer should be 5.47

**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 ...

**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.

**MATH**

Answer=EGG

**MATH**

THOSE WERE THE INSTRUCTION(THIS IS THIRD GRADE MATH)

**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 _________

**Physics**

H=5.09684

**Algebra**

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

**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?

**Chemistry**

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

**Linear Algebra - urgent!**

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

**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. ...

**math**

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

**math**

Sample mean and population mean are the same for normal distributions.

**math**

Yes.

**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...

**Linear Algebra**

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

**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...

**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?

**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.

**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 ...

**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?

**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*...

**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)

**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 ...

**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?

**Physics**

Thanks a bunch Bob Alex

**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 ...

**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

**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?

**Math**

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

**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

**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...

**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 ...

**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 ...

**science**

What are the answer choices?

**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!

**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, ...

**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.

**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...

**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.

**English**

Because that's an arrogant, Anglo-centric point of view?

**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 ...

**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 ...

**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)

**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.

**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.

**Algebra**

I'm getting D.

**cs 2**

Which part of this assignment are you having trouble with? The logic? Or File I/O?

**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...

**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. ...

**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...

**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.

**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 ...

**math**

What's the question?

**physics**

Er, what's the question?

**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.

**math**

Yes, quadrant IV is correct. :-)

**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 ...

**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

**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)/...

**math**

Sure, sounds good to me. :-)

**math**

I don't understand the question?

**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 ...

**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 ...

**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.

**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.

**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.

**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 ...

**Educational Technology**

I agree with all three of your answers. :-)

**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 ...

**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

**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...

**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...

**Math**

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

**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, ...

**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...

**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

**Math**

Multiply both sides by 3729, yielding 3729tan(7)