Monday
April 21, 2014

Posts by crystal


Total # Posts: 725

managerial economics
An article in Business Week reported the discovery of a new processing technology that makes it economically feasible to turn natural gas into liquid petroleum that yields superclean gasoline, diesel fuel, or any other product derived from crude oil. This discovery represents ...

History 12
What does lenin have to do with Tsarism, World War 1, March revolution and the provisional government, November Revolution, the civil war, War Communism, national Economic Policy, Trotsky, Stalin, and the Comintern?

Math
Loon lake has a "killer plant" problem similar to Ghost Lake. Currently, 5000 square feet of the lake is covered with the plant, The area covered is growing by a factor of 1.5 each year. Complete the table to show area covered by the plant for the next 5 years. 0 = 5...

Math
Tressa's closet is 5 feet long, 4 feet wide, and 7 feet high. What is the volume of Tressa's closet. A. 140 feet B. 140 square feet C. 140 cubic feet

physical
a 50 kg object moving at 12 m/s has a momentum of 600 kg times g m/s . what is the mass of an object moving at 4 m/s that has the same momentum?

physical
what is the size and direction of the final velocity of the two cars when a 0.4 kg toy train car moving forward at 3 m/s collides with and sticks to a 0.8 kg toy car that is traveling the opposite direction of -2 m/s

Chemistry
Magnesium metal reacts with phosphoric acid to produce hydrogen gas. If 50 g of phosphoric acid is used, how much magnesium metal is needed? How much hydrogen gas is produced?

socail studies
C

Statistcal Analysis
I need some help with figuring out the ratio-to-moving average. Can someone help me? Here's the problem: Sales of roof material, by quarter, since 1994 for Carolina Home Construction, Inc. are shown below (in $000): Quarter Year I II III IV 1994 210 180 60 246 1995 214 216...

Math
A ball pit contains 10 yellow balls and 14 green balls. What is the probability of randomly picking 3 green balls (replacing them), from the pit? 3/24

Math
104 students responses 21 liked sledding as their favorite winter activity if 500 people had. Responded, how many would have been expected to list sledding as their favorite winter activity? Round to the nearest whole person

statistics
I've been trying to work out these problems for about an hour.. I was given multiple choice answers but cannot get my answers even near the ones that were given to me. Here they are First problem: A. z = 0.75, fail to reject H0. B. z = 1.94, fail to reject H0. C. z = 1.94,...

statistics
I really need help with my statistical analysis... i cant understand it. Here are the questions A sample group was surveyed to determine which of two brands of soap was preferred. H0 :p = 0.50; H1: p is not equal to 0.50. Thirty-eight of 60 people indicated a preference. At th...

Math
How much must be invested to have 25,000.00 after 5 years in an account drawing 7% interest compounded continuously?

statistics
I have just a couple questions I have trouble understanding... can someone please help me? The data below indicate the rankings of a set of employees according to class theory and on-the-job practice evaluations: Theory 1 7 2 10 4 8 5 3 6 9 Practice 2 8 1 7 3 9 6 5 4 10 What i...

Physics
A soccer ball iskicked with an intial horizontal speed of 6 m/s and initial vertical speed of 3.5 m/s. Assume that the projection and landing height are the same, and neglect air resistance. Calculate the following a) the ball's projection speed and angle b)the ball's ...

math
Charlie has agreed to mow his neighbor’s lawn each week and will baby-sit some hours. If he makes $100 or more each week, his parents will charge him rent. How many hours should Charlie agree to baby-sit each week to avoid paying rent?

Math
In 1990, the population of Cheyenne, Wyoming, was 73,142. By 2000, the population had increased to 81,607. Write and solve an equation to find, the increase in Cheyenne’s population from 1990 to 2000. Mercury’s surface temperature has a range of 600 digress. This ran...

math
The pressure on a scuba diver at sea level is 14.7 pounds per sq inch (psi). The pressure increases 0.445 psi for each foot of depth. Suppose the pressure on a diver is 41.4 psi. How deep is she?

math
25/5 - (-4)*2 / 9

Math
how did farmer john find his missing cow? How did the cow get over the block of hay?

math
You are hosting a cookout for 24 people and are supplying the main dishes and several sides. You must take a trip to the grocery store in order to purchase all of the items you need. You know that hotdogs are $1.50 per package and there are 8 hotdogs in each package. You also ...

Psychology- Assessments
I think the answer is A

Psychology- Assessments
In comparison to the ______________ model, the _____________ model assesses the complexities of learning disabilities better than a one-step process where an individuals is tested once and diagnosed. a. discrepancy; Response to Intervention b. Response to Intervention; discrep...

Psychology-Assesment
I choose answer C

Psychology-Assesment
According to Cattell, a person trying to solve an entirely new kind of problem is using his or her__________, whereas a person working on a task that he or she knows well is using his or her ________ a. general ability, specific ability b. intelligence B, intelligence A c. flu...

psychology- assessments
Ms. Sue, Thank you. I was thinking that wasn't for sure

psychology- assessments
The fact that online instruments may not be available to individuals who do not have access to computers and/or the Internet raises concerns about the _________ of online assessments. a. content b. scoring c.norming groups d. interpretation

Statistic/Psychology
Joe had a score of 72 on the Counseling Aptitude Scale, and the standard error of measurement of the scale is 3. Where would we expect Tom's true score to fall 99.5 percent of the time? a.71 to 73 b. 69 to 75 c. 66 to 78 d. 63 to 81

statistic/Psychology
According to classical test theory if the observed variance of a test is 50 and the true variance is 40 what is the estimated reliability of the test? a. 0.40 b. 0.50 c.0.80 d. 0.90

statistic/Psychology
According to classical test theory, if the observed variance of a test is 50 and the true variance is 40, what is the estimated reliability of the test? a. 0.40 b. 0.50 c. 0.80 d. 0.90

Statistic/Psychology
I am thinking the answer would be B

Statistic/Psychology
If the correlation between one's interest in statistics and being a "fun date" was -0.70, it would mean that: a. The higher someone's interest was in statistics, the more likely it would be that he or she is a fun date b. The higher someone's interest was...

Statistic/Psychology
So would the correlation be 0.00

Statistic/Psychology
In using repression to predict an individuals performance on the criterion based on his or her score on the instrument, the prediction is least accurate when the correlation is: a.-1.00 b. 0.00 c 0.50 d. 1.00

Statistic/Psychology
Thats were I got confused. I was thinking he did but could it be wrong

Statistic/Psychology
For Tom

Statistic/Psychology
Joe had a score of 72 on the Counseling Aptitude Scale, and the standard error of measurement of the scale is 3. Where would we expect Tom's true score to fall 99.5 percent of the time? a.71 to 73 b. 69 to 75 c. 66 to 78 d. 63 to 81

homeland security
Weekly tasks or assignments (Individual or Group Projects) will be due by Monday and late submissions will be assigned a late penalty in accordance with the late penalty policy found in the syllabus. NOTE: All submission posting times are based on midnight Central Time. You a...

Physics
The beat frequency is 8Hz. What is f2 if f1 is 350Hz? F2=350Hz +/- 8Hz = 342Hz or 358Hz. If the beat frequency increases at 340Hz then it means that f2 must be 358Hz. Why??

College Algebra
How do you work out this problem? 3x3 + 2x2 + 3x+2 I showed three different people my work an they said I did it wrong I am so confuse.

Chemistry
If it takes 54 mL of 0.1 M NaOH to neutralize 125 mL of an HCI solution, what is the concentration of the HCI?

chemestry
if you dissolve 350 g of K(2)CrO(4)in 2.4 kg of water, what is the molality of the solution?

Dressmaking and Design
I need to see if my answers are correct on a couple of questions. 1. It's especially important to avoid stitching across the seam allowances when sewing a a. patch pocket with straight edges b. corner that has a seam c. point that has no seam d. curved-seam pocket I think ...

Physics
A hockey puck is sliding on frictionless ice. It slams against the wall and bounces back toward the player with the same speed that it had before hitting the wall. Does the velocity of the hockey puck change in this process? Explain.

Math
Precalc (1+i)^3 and the cube root of 8i

math
suppose that oil spilled from a tanker and spreads in a circular pattern whose radius increases at a constant rate of .5 feet per second. -find a function f that models the radius of the oil spill as a function of time r=f(t) with t measured in seconds. How long before the rad...

Math
Subtract(5a^3+3 b^3)-(2a^2b-4ab^2+3b^3+5a^3)=

Physics: Aluminum Block
A 1.65-kg aluminum block and a 6.85-kg copper block are connected by a light string over a frictionless pulley. The two blocks are allowed to move on a fixed steel block wedge (of angle è = 31.0°) as shown in the figure. Making use of the table below, determine the ...

physics
A boy coasts down a hill on a sled, reaching a level surface at the bottom with a speed of 6.2 m/s. If the coefficient of friction between the sled's runners and snow is 0.060 and the boy and sled together weigh 480 N, how far does the sled travel on the level surface befo...

Physics
Use conservation of energy E = K + U Ui (initial potential from spring) = Kf (final kinetic energy 1/2 kx^2 = 1/2 mv^2 v = x*sqrt(k/m) From kinematics: d = (Vf^2-Vi^2) / (2a) d = (x*sqrt(k/m))^2 / (2a) (substituting our v from above) d = (kx^2) / (2*ma) We know from forces tha...

social studies
white house staff

science
The temperature within the exosphere varies, depending on whether you are looking at the "day" side of the Earth, or the "night" side of the Earth. Because the atmospheric molecules are so disperse at this altitude, their energy is related to the amount of ...

Spanish 1
llego

math
Julie has been offered two jobs. The first pays $400 per week. The second job pays $175 per week plus 15% commission on her sales. How much will she have to sell in order for the second job to pay as much as the first?

Algebra
-3(x - 2) -1 > 2 - 5(x -6)

Chemistry
In the reaction 2H2O2(aq)-->2H2O2 + O2 (g), There is intially 0.865 M H2O2. After 10.0 minutes, the molarity of H2O2 changes to 0.792 M. What is the rate of reaction in terms of H2O2?

Algebra
-2(y-4)-(3y-2)=-2-(6y-2)

Math
In the sequence below, each shaded triangle, after the first is 1/4 the area of the preceding shaded triangle. What is the ratio for the shaded area of the 5th triangle?

math
3 + 7 - 7 + 3 - 3 × 3

com09
I am at a loss and need help with my 5 paragraph essay can anyone help me

social studies
historians don`t know for sure why people left mohenjo-daro. What are some possible explanations for the end of the civilization.

Math
Twice a number is greater than half that number by 24. Find the number.(ModelDrawing)

Math
Ohhhh. Thank you ! I was going about it backwards!

Math
A clothing store ordered 300 sweaters and sold 20 of them at $100 the first week. The second week, the selling price was lowered by $10, and 40 sweaters were sold. In the third week. The selling price was lowered by another $10, and 60 sweated were sold. If the pattern continu...

Math
Thanks again Steve!

Can anyone else please answer?
Not my orinigal post but the one right above this one, can someone answer?

Math
Can you get r by plugging in numbers into an equation, i.e. ar^n-1 and then solving by substitution/elimination? That was my initial thought but I couldn't figure out how...

Math
Determine the sum of the first seven terms of the geometric series in which ... F) t5 = 5 and t8 = -40 I'm stuck on this one!

Math
Okay, thanks. Just wanted to make sure I wasn't missing anything!

Math
For each geometric series, calculate t6 and S6. a) 6 + 30 + 150 ... So I'm not exactly looking for an answer to this question but I was wondering why they want you to find t6 too? Would finding out t6 (via general formula) help in any way when finding S6? I'm not tryin...

Math
Thank you!!

Math
Is there a way to find the term number of a sum in an arithmetic series? Like if you had the sum of the first 12 terms in a series could you find the term value of term 12 using the sum? For example in one of my previous questions : For each series, calculate t12 and S12 a) 37...

Math
I think this way is a lot faster and easier to do by just quickly typing it all into the calculator, so thank you!

Math
Determine the sum of the first 20 terms of the arithmetic sequence in which ... f) the 7th term is 43 and the 13th term is 109 I know you can make two equations : 43 = a + 6d and 109 = a + 12 d And subtract them to get d = 11 But I know there's another way to get d, that y...

Math
Oh. I guess the point of the question was for you to find t12 first by using the general formula so that you could have the last term, which would allow us to use the simpler arithmetic series formula, i.e., n(t1+tn)/2 rather than n/2(2a+(n-1)d) But I'd still like to know ...

Math
Okay, so I know this should be really easy but my mind is just drawing a blank: For each series, calculate t12 and S12 a) 37 + 41 + 45 + 49 + ... Okay so I calculated S12 to be 708, and I know that's right. For t12, I know I can easily find the general formula and then use...

english
try your best and most of all thik about it because I have to write the same thing.

Math
Thank you so much Reiny!!

Math
I'm learning series and sequences (grade 11). Please check that my steps show I understand what I'm doing/the concept and my answer as well: 5. The consecutive terms of an arithmetic sequences are 3.6, y, 8.2. Find the value of y. This seems to be a sequence question b...

math
a grocery store sells a 7 ounce bag of rasins for $1.10 and a 9 ounce bag of rasins for $1.46. Which size bag have the lowest price per ounce.

calculus
solve the following inequality. write your solution in interval notation. x^3+9x^2-108 less than or equal to 0

calculus
the graph of y= -1/4/x-2 (1/4 over x-2) can be obtained from the graph of y=|x| by which transformations a. what is the horizontal shift? a. five units to right b. 2 units to right c. 5 units to left d. 2 units to left b. by what factor is the graphstretched or shrunk vertical...

calculus
I was thinking that the asymptoes was y4,x= -6, and the domain was all real but the range I was incorrect. Thanks!

calculus
Using the function f(x)=4 - 1/(x+6)^2 A.what is the doamin? b.the range c. the asymptotes

Math
Is there another way to solve this problem? Without using π

Math
I haven't learned any of this with π incorporated into it. I think my teacher mentioned that we do it in grade 12? Radians and such... I'm in grade 11 though. This question is straight out of the textbook so I guess they did do that.. And they actually mix units l...

Math
I can't figure out this one question... A ship is docked in port and rises and falls with the waves. The function d(t) = 2sin(30t)°+5 models the depth of the propeller, d(t), in metres at t seconds. e) within the first 10 seconds, at what times is the propeller at a de...

I REALLY NEED HELP IN SCIENCE Plz !!!
If you double the concentrate of yeast in the dough how do you think your results might change ??? Please I really do need help in this thanks

Math
For f(x) = 1/2sin2(x-90°) What are the transformations? The 1/2 means a vertical compression by a factor of 1/2 And (x-90°) means there's a phase shift right 90° But what does the 2 mean? The one immediately left to the (x-90°). Does it mean a horizontal co...

Math
How would you write 2/3-13i in standard form?

Math
How would you write 2/3-13i in standard form?

Math
How would you write 2/3-13i in standard form?

Hamilton
Translate ten less than half of a number

chemistry
what is the pH of a 0.10 M solution of methylamine (CH3NH2, kb= 4.4*10^-4) at 25 degree C?

chemistry
what is the pH of a 0.10 M solution of methylamine (CH3NH2, kb= 4.4*10^-4) at 25 degree C?

Math
Completely understandable, thank you so much for checking back though!

Math
okay so I think I'm still kind of hopeless... my solution to the second question is way off, but here's what I did: right triangle ABC. (facing like this: >) so that AB is the hypotenuse, and I labelled AC as h for the height of the cliff. I drew a dotted line from ...

Math
Thanks! I don't know how I missed that.

Math
How did you get x = h/.625 = 1.6 h ? How did you arrive at 1.6?

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