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Posts by jim

Total # Posts: 1,663

Year 11 Maths
sec A is cos A

algebra
9 over y + 2 over 5 + 3 over 5y

College Physics
172.35

algebraic fractions in lowest terms
40c to the 5th power over 10c to the 4th power in lowest terms?

Brief Calculus and Applications
F(x)=√2x-1. Find non trivials of f and g such that (fxg)=F

Plz Help. I am lost!!!Human Anatomy and Physiology
Situation: You need to step up on a step to reach an object on a high shelf over your head. Your starting point should be anatomical position and your finishing point should be the position you are in once your hand has reached the object overhead. Instructions: (Part 1) Trace...

Bus/210
i need help getting started

algebra
(2x-3)(4x squared-x-10)=8x cubed-14 squared+Bx=30

physics
What is the number of the highest harmonic that could be heard by a person who is capable of hearing frequencies up to 1.00×104 ?

Managerial Accounting
Let me try this again How does shaving 5% off the estimated direct labor hours in the base for the predetermined overhead rate usually results in a big boost in net operating income at the end of the fiscal year?

Managerial Accounting
How does lowering your estimated direct labor hours increase your net operating income at the end of the fiscal year?

chemisty
13.0 grams

social worker
Why do you exist? I thought this was a realforum

international business
Some argue that translation gains or loses are not important so long as they have not been realized and are only accounting entries. what is the other side of that argument?

Physics
The rms speed of a sample of gas is increased by 5% . What is the percent change in the temperature of the gas? What is the percent change in the pressure of the gas, assuming its volume is held constant? please help!!

Physics- PLEASE!!
A U-shaped tube is filled mostly with water, but some vegetable oil has been added to both sides of the U tube. On the right side of the tube, the depth of oil is 5.00 cm . On the left side of the tube, the depth of the oil is 2.30 cm. The density of the water is 1x10^3 , and ...

Math
Thank you so much for your detailed reply. My problem is that we haven't done logs or "e" yet. Is there any other way arrive at an answer without knowing these? I really appreciate your help.

Math
I need to write 2 equations that represent the same exponential function with a y-intercept of 5 and an asymptote at y=3. I got y=2^(x+1) + 3 but I don't know how to find the second equation. Can someone please explain this to me. Thanks.

Math
I need to write 2 equations that represent the same exponential function with a y-intercept of 5 and an asymptote at y=3. I got y=2^(x+1) + 3 but I don't know how to find the second equation. Can someone please explain this to me. Thanks.

chemistry
If you are given a 0.32 g piece of sodium metal to react with water, how many moles of HCl would it take to neutralize the sodium hydroxide produced?

ANALYSIS AND DESIGN
* A project contains Initiation, Analysis, Design, and Implementation phases. How do we determine what tasks are assigned to each phase? Provide examples to illustrate your comments.

Social Studies
This is what i think. T F T F

Social Studies
True Or False Questions: The Crusades helped to increase the flow of trade in Europe The joint-stock company, in which individual men invested and profited in proportion to the number of shares purchased, was the principal instrument of England's overseas expansion. The ...

ANALYSIS AND DESIGN
How does the design phase of the project management life cycle differ in content and importance from the other phases?

honors english
In the Crucible what epithet did Giles Corey avoid by remaining silent?

honors english
In the Crucible what epithet did Proctor fear was fraudulent?

Math
0.468

Math
What is the rate of inflation of an item with a Consumer Price Index of 246.8 in 1991 and 362.4 in 1992? Round your answer to the nearest tenth.

Analysis and Design
Project "goals" for a high school graduation pool party.

Analysis and Design
assumptions to consider when organizing a graduation pool party

Chemistry
What is the electron configuration of Cu2+?

chemistry
Calulate the wavelengths (in nm) of the visible lines in the line spectrum of hydrogen using the Rydberg equation (nf = 2; ni = 3, 4, 5, and 6).

physics
Clockwise

Math
Needs an anwser.

Math
I see two ways to do this. Pick whichever you prefer. One simple way is to divide the fractions, bottom into top, to get a decimal. A slightly cleverer way, in this case, is to look at the second and reduce it to its lowest terms - divide top and bottom by 7 to get a vary ...

Math
a. the radius was how many feet? How many feet in a yard? Then how many feet in 2 yards? b. the diameter was how many feet? The radius is from the edge of the circle to the center. The diameter is edge to center to other edge, so it's twice as far. The diameter is twice ...

algebra
You're welcome!

algebra
Absolutely right all the way. Well done!

Math
Don't let the negatives throw you! You need a common denominator. What's a common denominator of 6 and 10? 60. 9/10 = what/60 ? 1/6 = what/60? Now that you have them both in sixtieths, just add to get your answer. But since they were both negative, your answer will ...

arithmetic
Well, at the 20th term, n is 20. Does knowing that help?

physics
calculate the force of a 300,00 kg jumbo jet that is accelerating 0.4m/square just before takeoff

physics
calculate the acceleration of a 2000kg single -engine airplane just before takeoff when the thrust of the airplane ia 500N Using the G.U.E.S.S. method

PreCalc (still confused)
First thing to remember is that a square is a rectangle; it's just a special case of a rectangle. Getting back to a "mathematical way to go about it", there are two I can think of, and one involves calculus. Maybe this is set to make you appreciate calculus when ...

PreCalc (still confused)
Let me phrase it as a real-life-ish word puzzle: You need to build a pool 400 sq. m. in area. Building curved or slanted sides is too complicated and expensive, so the sides have to be straight, so you're going to make it a rectangle. The sides cost you $10 per metre to ...

PreCalc (still confused)
Good question! 2X+2Y could be equal to lots of things: your question is to find the _minimum_ they can be equal to. For example, we know xy=400 so x=5, y = 80 works for that. Then 2x + 2y = 10 + 160 = 170. That is one answer. x=10, y=40 also gives us xy=400. Then 2x + 2y = 20...

math
You've done the hard part, so you're probably just over-thinking it! :-) When x=2, plug 2 into that equation of the circle, and what do you get? x^2 -4x + y^2 -6y =12 4 - 8 + y^2 -6y = 12 y^2 -6y -16 = 0 and solve for y. Same method works for getting the points where y=3.

maths
The sin of an angle is opposite / hypotenuse We know the hypotenuse. We know the angle, so ee can get the sin of the angle. Set sin(35)= x/13 and solve for x.

Algebra
There isn't an "easy" factorisation for 5x^2+2x-1, so you can use the formula for the factors of ax^2 + bx + b (-b +- sqrt(b^2-4ac)) /2a but I'm not quite sure why this proves the domain. In the second part, I think I agree with you, but it depends where you ...

math- Algebra 2
OK. First, what exactly is the question? How many seats in the last row? How many seats in the auditorium? Let's figure a model to start. Row 1: 40 Row 2: 43 Row 3: 46 Row 4: 49 and so on. We want a formula that, given the row, will tell us how many seats. Multiplying the ...

algebra
What exactly is the question?

Math
Already answered below by bobpursley for "Lila"

Math
Already answered below by bobpursley for "Lila"

bobpursley - Oops
I just overtyped your name into the from rather than the subject.

English
Well, you started out with a perfectly good What. When have people been starving since? Where are people starving? (or where used they starve, or will they starve?) Why do people starve today? (And while lack of food is the simple proximate answer, you can go back a step and ...

English
It may be simplistic, but I've always found the W (and one H!) questions useful for separating out issues: What? When? Where? Why? Who? Whether? Which? How?

math- Algebra 2
You're welcome!

math- Algebra 2
It just means, add: the value of (10k-8)(6k+7) when k=1 plus the value of (10k-8)(6k+7) when k=2 plus the value of (10k-8)(6k+7) when k=3 plus ... (and so on, 4, 5, to 9, 10)... the value of (10k-8)(6k+7) when k=11 plus the value of (10k-8)(6k+7) when k=12 So you could just do...

books
It's a bit unfair asking for help with the NPR puzzle of the week, isn't it? :-)

Science
There are some ideas at Biographies for Kids. You can get there by typing "garden of praise" "Biographies for Kids" leaders scientists (with the quotes) into Google and then going quite a way down the page until you come to the scientists - though I think a...

Math
OK. That's the first sentence covered in x+2y=56 . In 8 years time, the son's age will be half of john's age. If x is John's age now, then his age in 8 years is (x+8), and his son's will be (y+8). So the next thing is to make a second equation from that ...

math 10
Answered below.

Calculus
(x+5)/(x - 3) is just (x+5) ----- (x-3)

Calculus
What is 8 divided by zero?

Calculus
No, it's not wrong. When x=3, we have: (x + 5) / ( x - 3) = (3 + 5) / ( 3 - 3) = 8 / 0 which is undefined, because of division by zero.

Sameul
It can be factored, but not into integers like (x-1); more like sqrt(2)+-1, and it's definitely not a perfect square. I suspect you've got one of the signs backwards in your head, and you'll probably recognise that as we work through it. Anyway, direct ...

alegebra 1
Given two points, the slope is easy: it's the difference in the ys divided by the differences in the xs. Just be careful to get the numbers in the right order and careful of the signs. For example, (3,5) and(2,-2) x1=3 x2=2 y1=5 y2=-2 So the slope is (y1 - y2)/(x1 - x2...

C programming
Ok, so you need to test all a, b, c from 1 through 100 for a*a + b*b = c*c. What point would you like help with?

Physics!
30.6 cm seems to have become 30.6 m instead of .306 m. Does this solve your problem?

Language Arts
I can't post a link but dictionary reference com gives strat-uh-fahy and also the IPA which I will try to post here /ˈstrætəˌfaɪ/

PreCalc
"two sides that are equal and two other sides that are equal" is a good start. Call the length of one type of side x, and the other y. Then the area is x * y And the perimeter is 2x + 2y Check this on a small 5 * 3 rectangle, to be sure you understand it. We are told...

SQL for Business
OK. Do you have a table to test on? Here's a statement that might get you going: SELECT Supplierid, SUM(Count) FROM Part WHERE Count > PARAMETER GROUP BY Supplierid If you just run this against your table, substituting some number in for PARAMETER for now, you should ...

SQL for Business
Which part or concept or keyword are you having problems with?

algebra 2
Count from -9, -8, -7... to 2, 3 Where is halfway?

high school math
I presume you want to multiply it out? (1+2y)(3+5y) = 1 * (3+5y) + 2y * (3+5y) = 3 + 5y + 6y * 10y^2 and you can finish

gr 9 math
I got my PC to run up a hundred of each type. If you want something else, let us know. -10x^2 -27x -18y^2 6x^2 + 30x -36y^2 32x^2 -16x -30y^2 -28x^2 -85x -22y^2 -40x^2 + 21x + 49y^2 27x^2 -33x -4y^2 -36x^2 -6x + 90y^2 15x^2 -13x -20y^2 -24x^2 -95x -50y^2 -25x^2 + 60x -35y^2 ...

gr 9 math
What kinds of polynomials? Can you give an example, please? Something like 7x^2 + 46x + 24 y^2 that factors into (ax+by)(cx*dy), or something like 6x^5 + 21x^4 + 13x^3 - 10x^2 -78x -36, that factors into (3x^3+2x-12)(2x^2+7x+3) Or something else?

math
Bring everything to feet as a unit, so the cartons are .5 * .5 * 1 cu. ft. = 0.25 cu.ft. For the tank, it's pi r^2 h again: pi * 16 * 8 = 128 pi cu. ft. So how many containers will that fill?

Literature
I'm inclined to think that that last sentence implies omniscient; a third-person limited narrator could not say what the protagonist knew. IMHO, of course :-)

math
volume of cyl: pi r^2 h but if h = d then h = 2r, so pi * r^2 * 2r = 2pi * r^3 Vol of hemisphere = (1/2) volume of sphere: = 2/3 pi r^3 So the ratio is obvious from those results.

Math
volume cylinder = pi r^2 h = pi * 5^2 * 29 = pi * 725 volume sphere - (4/3) pi r^3 = pi * 4/3 * 5^3 = pi * 500/3 and you can finish

Grammar and Composition
Wow. You only know 21 words you don't know? :-) I've always liked aglet and dottle, myself. Anyway, there's quite a fun site called freerice - I can't post a link here but if you Google that word or add the most common dot after it, that is com, you'll get ...

Algebra
I think maybe you're getting two concepts mixed up, but I'm not quite sure. The _domain_ is the set of values x can take. That is every real number_except_11, since it's undefined at x=11. The _solution_ to (8x+3)/(11-x) = 0 (aka the y-intercept of the graph) is x...

math
Your answer is not wrong, but it isn't "a fraction in simplest terms", because you've brought in a decimal approximation. Go back a step, to -87 / (-6/7) which is where you were before you detoured into decimal-land. Dividing by 6/7 is the same as multiplying...

Algebra 1A
7 x + 2 <30 Subtract 2 from both sides: 7 x < 28 Now divide across by 7, and finish,

math 5th
Between 2 and 4 yards, and A multiple of 0.5. No integer can be the answer, because it wouldn't divide evenly into 24.5. The only two possibilities are then 2.5 and 3.5. Which is it?

Pre-Calculus
I think you mean 9 cos (pi * x /6) where x is the month number 0 through 11. And very neat that snswer is. It provides a low of 2 and a high of 20. Mind you, you might want to mention that your actual answer is: 1,000,000(9cos(pi/6) + 11) or 10^6(9cos(pi * x/6) + 11) to make ...

calc
It all looks OK to me, except from 1 to e^4 you should have your signs the other way around: ln(1+ln(e^4)) - ln(1+In(1)) ... =~ +1.60944

trig
Ask yourself this: 1. If x>0, is |x - 2| - |x + 2| positive or negative or zero? (or think of it as "is |x - 2| > |x + 2| ?" 2. If x==0, then clearly |x - 2| - |x + 2| is zero. 3. Now, the interesting one: what if x is negative? Then is |x - 2| > |x + 2| ?

physics 8th grade
If a woman hasa mass of 50 kg calculate her weight in neutons

math
Your first answer, y = x + (1/x), is absolutely right. I don't understand why you would think that a square would be involved. Bringing in the square makes it a completely different thing, and that's why you're getting different results on your graphing calculator...

Algebra
You can't separate the added parts and take the square root of each. (You could if they were multiplied, but not if added.) I will show a counterexample. You were looking at sqrt(x^2+1). Consider this example - let x=3, then we have : sqrt(3^2+1) = sqrt(9+1) = sqrt(10) Now...

Algebra I
You've got the 2w bit right, but you haven't followed through on your original equation. Divide 2w^3 by 2w Divide 6w^2 by 2w Divide 4w by 2w Put 'em all back together. What have you got now?

Math
To graphing a straight line: 1. Draw your axes. 2. Set x=0 in your equation to get the y-intercept: x + y = 1 0 + y = 1 y = 1 so we have one point: (0,1) 3. Set y=0 in your equation to get the x-intercept: x + y = 1 x + 0 = 1 x = 1 so we have a second point: (1.0) 4. Mark the ...

college
Assume you are performing the calibration step of Experiment 8 and you begin with 80 g of water at 20 oC and 80 g of water at 80 oC. After adding the two portions of water into your calorimeter setup and following the procedure outlined in the experiment, you determine the ...

chemistry
Assume you are performing the calibration step of Experiment 8 and you begin with 80 g of water at 20 oC and 80 g of water at 80 oC. After adding the two portions of water into your calorimeter setup and following the procedure outlined in the experiment, you determine the ...

math
You're welcome!

math
2y^2-y(3-2(y-4)-y) Get rid of the inner brackets: 2y^2 - y(3 - 2y + 8 -y) Multiply the y into the brackets: 2y^2 - (3y - 2y^2 + 8y - y^2) 2y^2 - 3y + 2y^2 - 8y + y^2 Now collect the terms together.

MATH/SCIENCE
Easha has the right idea. You need to get all the inputs and outputs into the same units. There's water entering the lake, and there's water leaving the lake. The numbers are just given in different units, which is common in the real world! There's nothing ...

MATH
In each of them, find some factor all the terms have in common. Take #2 for example: 5a^2 - 25a^3 Well, both divide by 5, so we have: 5(a^2 - 5a^3) but we can also take a^2 out of the expression inside the brackets: (a^2 - 5a^3) = a^2*1 - a^2 * 5a = a^2(1 - 5a) So the whole ...

math
I don't think those equations came out right.

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