Saturday
December 20, 2014

Posts by jim


Total # Posts: 1,446

Algebra ll
Slope-intercept form y=mx +c where m is the slope. You are told that the slope is -4, so the equation muct be like y = -4x + c That rules out one of your choices. Now, of the other two, the equation must be true for the point (1,2). So which of these is true? 2 = -4 * 1 + 6 2...
September 30, 2009

math
Think about the line y=-1. What does it look like? It's all the points where y is -1: (0, -1), (2, -1), (-2000, -1)... so it's a line straight up and down. Any line perpendicular to is must be straight across, so it must be of the form x = something, where all the ...
September 30, 2009

8th grade math
Write down the prime factors of each. Look at all the factors, of both numbers, together. The LCM will be the smallest set of this list from which you can make either of the two original numbers. Example: 30 = 2 * 3 * 5 24 = 2 * 2 * 2 * 3 So we have 2, 2, 2, 2, 3, 3, 5 to ...
September 30, 2009

math
Yes. You want the two big digits in the tens place for the big one, and you want them in the units place for the small one. So 41 + 32, or 42 + 31, and 14 + 23 or 13 + 24 are the best you can do.
September 30, 2009

C Programming
Oops. I got the bracket messed up in the pseudocode and left a <= instead of a < in the while.
September 30, 2009

C Programming
I doubt that it was too long, considering the programs you and I posted earlier. Maybe indentation? You could try something like a do loop around your validation, of the form: do } {get heading and display error message if necessary) } while (heading is not valid) e.g. /* ...
September 30, 2009

Math
I don't know what polygons you drew, but consider this: no matter what path you took, if at any point you are turned to the left of where you started, you must have turned through 90 degrees (plus some integer number of full turns); if at any point you are turned backward ...
September 29, 2009

physics
A Newton is 1 kg * m / s^2. The force here is 20 kg * 5m / s^2. You should see it clearly from there.
September 29, 2009

Algebra 1
Yes! That's what I get, too.
September 29, 2009

physics
Start by calculating the acceleration of the plane as it moves from rest to take-off. It gets up to 80 m/s in 35 seconds, so its acceleration is 80/35 m/s^2. Now you can just plug in the formula for distance travelled under acceleration = ut + 0.5at^2. Initial velocity u is ...
September 29, 2009

C Programming
Your problem is that you are always doing a CtoF or FtoC conversion, even when it's F to F or C to C. You need to take both choices into account in your conversion logic, not just the one you're converting to. Actually, your approach is a bit convoluted. It can be done...
September 29, 2009

math
I'm not sure I know what the question is asking. I'm guessing you have to fill in the numbers equal in distance all the wat between 1562 and 1874. There are five numbers missing, so there are six gaps between. What size must a gap be? Well, there are 6 gaps of equal ...
September 28, 2009

Stats
Sorry about my mental arithmetic error. :-) So 9 months is 2.12 SD. so 1SD is 4.25 months. 1.28 SD is then 5.44 months from the mean, so the mean is 22 - 5.44. Check: working it the other way .84 is 3.57 months, so the mean is 13 + 3.57. Do those agree? Yes, our mean is 16.57...
September 27, 2009

Stats
90% is 22 months, is 1.28 SD from the mean. 20% is 13 months, is .84 SD in the opposite direction from the mean. Thus, a difference of (22 - 13) months is equivalent to to (1.28 - (-.84)) SD.
September 27, 2009

Stats
Given the mean and atsndard deviation, you can find the score for an area under the curve, but working backward, given two percentiles and scores, you can work that in reverse. Reading off the numbers from a z-table (I hope you don't have to work it out from the equation...
September 27, 2009

math
I'm not sure what the question is, but if k + 9 is greater than 12, then what is k greater than? Pretend k is zero. Is k + 9 > 12? Pretend k is 7. Now, is k + 7 > 12? So what must k be greater than? Another way to approach the inequality is to add or subtract the ...
September 27, 2009

Advanced Functions - urgent
This appears to be from an intro to calculus course. "instantaneous rate of change" is equivalent to slope, so the questions A and B become "what is the slope of the function" at these points. Have you done differentiation? If you have, you should be able ...
September 27, 2009

Algebra 1A
evaluate (-8b)^2 and -8b^2 when b=10. (-8b^2)= -8b^2=
September 27, 2009

FIN 200
Collins Office Supplies is considering a more liberal credit policy to increase sales, but expects that 9 percent of the new accounts will be uncollectible. Collection costs are 5 percent of new sales, production and selling costs are 78 percent, and accounts receivable ...
September 26, 2009

pre calculus
The first pair is very very easy. Remember that a line that passes through the origin must be of the form: y = mx since the intercept is zero. You are told that this line passes through the origin and that the point (-1, 5) satisfies the equation. You should be able to write ...
September 23, 2009

C programming
Oops, I meant 6 possible answers. While I'm here, remember strcpy puts the value into the string, and strcat appends it to the end of the string. Remember to be sure to declare result to be a char field (more than) big enough for what you're going to put in it.
September 23, 2009

C programming
It's not too hard. Think that there are only these possibilities: Positive X, Positive Y Positive X, Negative Y Negative X, Positive Y Negative X, Negative Y and zero x and / or y OK, so your program will output one of 5 possible answers. You take in two numbers, call them...
September 23, 2009

math
Take any digit, say 2. Multiply it by 10. What's the last digit? Multiply that by anything else. What's the last digit?
September 23, 2009

math
It's a very simple pattern, really. :-) Think what happens to the last digit of any number when multiplied by ten.
September 23, 2009

calculus
Oops, I didn't calculate the intercepts. My bad.
September 23, 2009

calculus
I wonder if the second question isn't a little more mean and evil than that? :-) The parabola is upturnd, symmetrical around x=0, like a rounded hill. A tangent to that parabola that forms a side of an equilateral triangle as described would be of the form +/-sqrt(3)x + c...
September 23, 2009

math
Answered below
September 22, 2009

math
Answered below
September 22, 2009

college math statistics
I agree with you on A and B. C: You know that P(over 65) = .12 and the question states that 40% of this group take 5 or more prescriptions. Can you take it from there? D: First figure: 1) How many people under 65 use 5 or more prescriptions and 2) How many people over 65 use 5...
September 22, 2009

math statistics/probability
Answered above
September 22, 2009

Algebra 1
Call the number of miles x. Every trip costs at least 1.50, so we can call that a constant that we add to every trip. It is also the only fare if the trip is two miles or less/ In addition to that, every trip over two miles costs an extra 1.20 * x, except for the first two ...
September 21, 2009

algebra
There is no single "solution" to this equation. You can see that easily: 9 + 3 * 1 = 12 6 + 3 * 2 = 12 so this does not specify a unique x or y, but for any given x, there can be only one y. In fact, it specifies an infinity of (x, y) pairs, that, if you graph them, ...
September 20, 2009

math
I'd go for "negative y-values are reflected in the x-axis", but my terminology may be out of date.
September 20, 2009

Math
Apart from the subject, that equation isn't going to peak for x > 0. I think you may have an error in the question.
September 20, 2009

Math
First, 5:00, 120 minutes, is right. You can do this without algebra. In fact, algebra would only complicate it. In the jargon, 120 is the lowest common multiple (LCM) of 40 and 60. That means that it's the smallest number that both divide into evenly. 40, 80, 120 60, 120 ...
September 20, 2009

Physics - heat
1 caloris is the amount of energy needed to raise the temp of 1g or water 1 degree. So if it raises 50g by 28 deg, that's how many calories? OK, so we know how many calories affected the water, but we are also told that the burning was only 40% efficient, which means that ...
September 20, 2009

physics
You're very welcome, Mary. Sometimes, just sometimes, a picture, or graph, or video, is worth much more than a thousand words.
September 20, 2009

physics
When the rivet goes in, let's say its length is L. As it cools, it shortens a little, so its length is now L-delta(L). But it's holding the two plates, so as it shortens, it pulls them together just a little, by the amount delta(L). What you're thinking is that its...
September 20, 2009

physics
Consider the amount of contraction in cooling - in _both_ directions. The cross-sectional contraction is a minor negative, but the rivet is much longer than its cross-section, so the contraction along its length is proportionally greater. And, remembering that the rivet is ...
September 20, 2009

Logarithums?
I don't see why you have to convert it; they are indeed the same thing. I want to draw a graph for this, but I can't :-) In general, you can use the rule that ln(1/x) = -ln(x), so you can simply declare that and be done. I'll try to show an equivalence so it might ...
September 20, 2009

science
For more details, look up "Newton's law of universal gravitation" on Wikipedia, but the gist is that the force between the Earth and the Moon depends on the product of the masses divided by the square of the distance, and then thetre's a factor g that is ...
September 20, 2009

math
I think this is not the full question?
September 20, 2009

math
The brackets mean that you need to add the 8 and the 7 first. 8 + 7 = 15. Now multiply that 15 by 3, and multiply that answer by 2.
September 20, 2009

math (algebra)
40
September 20, 2009

Algebra I
Call the numbers A, B and C We know A + B + C = 147 We are told that: B = 2 A + 4 (two times the first number and add 4) and C = 3 A - 5 (five less than three times the first number) This is called substituting. Now we can substitute (2 A + 4) for B whenever we see it. Using ...
September 19, 2009

Science
What might be the differences between liquids in a mixture? They might have different... what? Boiling points? Freezing points? Density, which in liquids we often measure as specific gravity. If it's a mixture, the two liquids will very probably have different boiling ...
September 19, 2009

physics
Sorry, missed your followup earlier. I get the numbers you do, but something is funny with the question. h = 3.40t^3 anything with a t^3 term isn't acceleration; it's jerk. Constant jerk, in fact, that would have the chopper well into outer space in 60 seconds! Sorry, ...
September 19, 2009

physics
How high is the chopper after 2.05 s? call it H H = 3.4 * 2.05^3 m Now from that height, it drops something. I assume we're not taking air resistance into account here, or the question would be much longer. I don't know how accurate the measuure your class uses for g, ...
September 19, 2009

latin
ad lib. is short for ad libitum meaning at will (more or less) et alia, shortened to et al. (et = and, alia = others) versus (against) gets cut to vs. (why is abbreviation such a long word? :-) Quod (which) vide (see) gets shortened to q.v. cf., short for confer, means compare...
September 19, 2009

physics
Assume the particle starts at x=0. What is the position after 2.3 s? x = (50 * 2.3) + (10 * 2.3^2) That's how far it has travelled in 2.3s From there the average velocity is easy, I think
September 19, 2009

math
Scientists and mathematicians tend to avoid pie charts, because humans have a harder time judging angles and areas than line lengths. The Wikipedia page on Pie_charts, which I just visited, shows examples of a pie chart with apparently equal-ish segments that show up as ...
September 19, 2009

physics
Is the question average speed? Assuming average speed, you must find total distance, then total time, then divide them Time is easy: 24 + 36 + 44 + 13 minutes So how far do you get driving 24.0 min at 63.0 km/h? 36.0 min at 45.0 km/h? 44.0 min at 49.0 km/h? 60 min at 63 kph ...
September 19, 2009

math
How you present the pie chart is kind of up to you, unless you were given specific instructions. You could put the numbers of deaths, or the percentages, or both. Apparently I can't put a link here, but if you go to the Wikipedia page Pie_chart you will see typical examples.
September 19, 2009

math
The numbers are close, but not exact since for example alcohol is about 12.6 rather than 13, but yes, you've clearly got it - but be careful; those numbers are degrees, not percent Alcohol is about 3.5%, and that makes about 12.6 degrees of a circle
September 19, 2009

math
Ayup! 54120 total deaths 510 from murder will be represented by about 3.4 degrees of the circle
September 19, 2009

math
A useful approach is to take a simpler case Suppose there were just 5 by murders, 30 by accidents, and 65 by tobacco How many would all the deaths add up to? What proportion of all deaths would be by tobacco? So there were 100 deaths, 65 by tobacco So tobacco would be 65% of ...
September 19, 2009

Technology
What about the zipper? Always my favorite tech story. :-) Or the camera phone? Quite recent, and there's a great story about its invention, which you can find in several places.
September 19, 2009

math
Multiply both sides by d^2 F(d^2)=G(mM) Divide both sides by F (d^2)=G(mM)/F Now take the square root d = SQRT(G(mM)/F)
September 19, 2009

math
Well, you have a) one variable per entity, and they are b) discrete rather than continuous, and c) within a reasonable range; the largest is no more than 80 times as big as the smallest, so you won't go wrong with a simple linear graph - column or bar chart. If you had two...
September 18, 2009

college
If cashews cost $5.00 per pound and peanuts cost $1.50 per pound how do I write the formula to determine how many pound of cashews to mix with 30 pound of peanuts so that the mix will sell for $3.00 per pound.
September 14, 2009

accounting
The Landis Corporation had 2008 sales of $100 million. The balance sheet items that vary directly with sales and the profit margin are as follows: Cash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5% Accounts receivable...
September 7, 2009

math
9/14divided by 15/28
August 18, 2009

crt/205
Controlling Irrational Fears After 9/11* We present this selection as an example of a fairly well-reasoned argumentative essay. There is more here than arguments—there’s some window dressing and you’ll probably find some slanters here and there as well. You ...
June 22, 2009

1st grade
My room is a mess. Mom said, "I have to clean it now."
June 16, 2009

1st grade
My room is a mess. Mom said, "I have to clean it now."
June 16, 2009

1st grade
thanks
June 16, 2009

1st grade
friend
June 16, 2009

1st grade
one syllable inside, many, friend
June 16, 2009

1st grade
Let's plant a tree by Mr. Olsons fence. is that a sentence
June 16, 2009

Science
Which direction do meridians run and what do they measure?
June 7, 2009

Physics
The charge on the door must be electrically neutral. If the door were positively or negatively charged, the electrons in the balloon would be repelled from or attracted to the door, making the overall charge on the door side of the balloon negative or positive, and then the ...
May 20, 2009

calculus
A rectangle has its base on the x-axis and its upper two vertices on the parabola y=12−x2 . What is the largest area that the rectangle can have
May 19, 2009

calculus
You are planning to make an open-top box from an 12 in by 12 in piece of cardboard by cutting congruent squares from the corners and folding up the sides. What are the dimensions (of the 3 sides) of the largest volume you can make this way?
May 19, 2009

math help please
There are 9 one-to-one correspondences possible (2 sets of 3, thus 3^2)
May 18, 2009

History
If the 13th, 14th, and 15th Amendments, which were passed almost 100 years earlier, guaranteed that African-Americans had the right to vote, why was legislation such as The Voting Rights Act of 1965 necessary? 1) States were passing laws that discouraged or disqualified ...
May 8, 2009

History
All of the following are examples of how a local jurisdiction may have tried to inhibit African-Americans from voting prior to the Voting Rights Act, except: Poll Taxes Literacy Tests Intimidation and Violence Skin Color Comparison Tests Is the answer poll taxes?
May 8, 2009

math
Evaluate: 3^2 + 2^2 x 5 - sqrt 25 over 8 - 4 / 2 + 2 I am confused on the order in which I solve this. Please help!
April 29, 2009

Finance
The market allocates capital to companies based on:
April 22, 2009

Math
  y=2x+3 How do you find the inverse of this function? I know that you have to get the x by itself but i am not sure how.
April 14, 2009

Engineering
Can someone please help me with this problem? In order to reduce the material cost, an engineer decides to use a hybrid beam instead of an all-carbon fiber beam. Both beams have the same overall dimensions with rectangular cross-sections. The hybrid beam contains carbon fibers...
April 14, 2009

crt 205
Final Project
April 12, 2009

Physics
I have to design a laboratory activity to answer the question, "What is the relationship between the diameter of a circle and the area of the circle?" My teacher said to use a previous activity as a templete to help me. For the previous activity you had to find the ...
April 1, 2009

physics
As shown below, a bullet of mass m and speed v passes completely through a pendulum bob of mass M. The bullet emerges with a speed of v/2. The pendulum bob is suspended by a stiff rod of length and negligible mass. What is the minimum value of v such that the pendulum bob will...
March 22, 2009

English
Can harrowed mean worried? In the dictionary, I'm only finding that it has to do with farming, but in the context I see it in, it looks like it'd mean worried.
March 15, 2009

English
What does the word innuendo mean in this context: the air is alive with chatter and laughter and casual innuendo. None of the dictionary definitions make sense.
March 14, 2009

Trivia
Unscramble these 5 letters to form a St. Patrick's Day term? FETSA
March 8, 2009

chemistry
its c3ho5
March 6, 2009

7th grade science
i did the same question its 20 60 120
March 6, 2009

Composite Materials
Thank you very much.
February 26, 2009

Composite Materials
Can someone please help with this problem? A burnout test was performed to determine the volume fractions of constituents in a glass/epoxy composite. The following observations were made: Weight of empty crucible = 47.6504 g Weight of the crucible and small piece of composite...
February 26, 2009

french
what is government in french? thanks, you will help me with my dissertation greatly xx
February 17, 2009

french with japanese
what lives in a stable
February 17, 2009

biology
i've only got like ten minutes so if anyone knows please HELP.
February 16, 2009

biology
37-40 please
February 16, 2009

biology
h ttp://i726.photobucket. com/albums/ww263/fornss/b iology2.jpg?t=1234820797 (remove spaces)
February 16, 2009

CACULUS
dy/dx = (y-1)^2 cosπx There's a horizontal line with equation y=c that satisfies this differential equation. Find the value of c.
February 11, 2009

Warren Hills
How do I solve y-5=3x
February 10, 2009

CACULUS- EXPONENTIAL GROWTH
A population of animals in an ecological niche is growing in time so that it's rate of growth dp/dt is related to its current size by the differential equation dp/dt = 900/p^2. If time is measured in years and initially there are P(0) = 10 animals present, find the ...
February 9, 2009

spanish
YOU USE THE PRETERITE, NOT THE IMPERFECT!!!! ERA SHOULD BE FUE!!!!!
February 9, 2009

Macroeconomics
Is the slope of the savings equivalent to the size of the multiplier
January 31, 2009

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