Thursday
November 27, 2014

Posts by crystal


Total # Posts: 739

Physics
A runner moving at a speed of 7.7 m/s rounds a bend with a radius of 21 m. What is the centripetal acceleration of the runner? My teacher doesn't explain anything very well and I don't understand how to figure it out.
November 5, 2014

math
A biker traveling with a velocity of 80 feet per second leaves a 100 foot platform and is projected directly upward. The function modeling the projectile motion of the biker is s(t)=-16t^2+80t+100,where s(t) is the height and t is the number of seconds the biker is in the air...
October 29, 2014

2nd grade math
It is greater than 43 and less than 52. If you add the digits, the sum is 8. Write the number word
October 16, 2014

math/ unit rates
A fertilizer covers 5/8 square foot in 1/4 hour.
September 28, 2014

math/ unit rates
I try to do it but it doesn't look right.
September 28, 2014

math/ unit rates
A garden snail moves 1/6 foot in 1/3 hour
September 28, 2014

math/ unit rates
Kenny reads 5/8 page in 2/3 minute
September 28, 2014

unit rates
Thank you
September 28, 2014

unit rates
Yes
September 28, 2014

unit rates
Julio walks 3 1/2 miles in 1 1/4 hours
September 28, 2014

Algebra II Honors
There are some interesting special cases in which the graphs turn out to be parallel, perpendicular, or coincident with the coordinate planes or axes. Sketch a graph of each of the following equations by drawing their traces as in Problem 1. Then tell what the graph is ...
September 24, 2014

Accounting
Dr. Rees: Ruth, good to see you again. Why didn’t you call me when you were in Denver? We could have had dinner together. Dr. Turner: Actually, I never made it to Denver this year. My husband and kids went up to our Vail condo twice, but I got stuck in Fort Lauderdale. I ...
September 14, 2014

Maths
Alison discovered that she had spent 2/5 of her money, leaving her with £21. What amount of money did she originally possesses?
May 12, 2014

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 ...
April 1, 2014

Finance
Fiona Plans To Invest $500 Later Today. She Wants To Know To What Amount Her Investment Will Grow In 20 Years If She Earns 12 Percent Interest Compounded (a0 Annually, (b) Quarterly, And (c) Monthly
March 29, 2014

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?
March 14, 2014

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 = ...
March 10, 2014

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
February 20, 2014

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?
February 15, 2014

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
February 15, 2014

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?
February 5, 2014

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...
January 25, 2014

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
January 15, 2014

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
January 14, 2014

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...
December 27, 2013

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 ...
December 27, 2013

Math
How much must be invested to have 25,000.00 after 5 years in an account drawing 7% interest compounded continuously?
December 9, 2013

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 ...
December 4, 2013

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 ...
November 7, 2013

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?
October 4, 2013

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 ...
September 19, 2013

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?
September 11, 2013

math
25/5 - (-4)*2 / 9
September 5, 2013

Math
how did farmer john find his missing cow? How did the cow get over the block of hay?
August 28, 2013

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 ...
August 25, 2013

Psychology- Assessments
I think the answer is A
August 23, 2013

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; ...
August 23, 2013

Psychology-Assesment
I choose answer C
August 23, 2013

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. ...
August 23, 2013

psychology- assessments
Ms. Sue, Thank you. I was thinking that wasn't for sure
August 23, 2013

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
August 23, 2013

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
July 27, 2013

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
July 27, 2013

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
July 26, 2013

Statistic/Psychology
I am thinking the answer would be B
July 26, 2013

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...
July 26, 2013

Statistic/Psychology
So would the correlation be 0.00
July 26, 2013

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
July 26, 2013

Statistic/Psychology
Thats were I got confused. I was thinking he did but could it be wrong
July 26, 2013

Statistic/Psychology
For Tom
July 26, 2013

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
July 26, 2013

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 ...
June 23, 2013

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??
June 3, 2013

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.
May 15, 2013

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?
May 12, 2013

chemestry
if you dissolve 350 g of K(2)CrO(4)in 2.4 kg of water, what is the molality of the solution?
April 25, 2013

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 ...
April 17, 2013

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.
April 10, 2013

Math
Precalc (1+i)^3 and the cube root of 8i
March 18, 2013

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 ...
March 11, 2013

Math
Subtract(5a^3+3 b^3)-(2a^2b-4ab^2+3b^3+5a^3)=
March 8, 2013

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 ...
March 4, 2013

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 ...
March 4, 2013

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 ...
February 27, 2013

social studies
white house staff
February 26, 2013

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 ...
February 26, 2013

Spanish 1
llego
February 26, 2013

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?
February 26, 2013

Algebra
-3(x - 2) -1 > 2 - 5(x -6)
February 26, 2013

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?
February 26, 2013

Algebra
-2(y-4)-(3y-2)=-2-(6y-2)
February 24, 2013

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?
February 22, 2013

math
3 + 7 - 7 + 3 - 3 × 3
February 19, 2013

com09
I am at a loss and need help with my 5 paragraph essay can anyone help me
February 12, 2013

social studies
historians don`t know for sure why people left mohenjo-daro. What are some possible explanations for the end of the civilization.
February 6, 2013

Math
Twice a number is greater than half that number by 24. Find the number.(ModelDrawing)
January 14, 2013

Math
Ohhhh. Thank you ! I was going about it backwards!
January 12, 2013

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 ...
January 12, 2013

Math
Thanks again Steve!
January 12, 2013

Can anyone else please answer?
Not my orinigal post but the one right above this one, can someone answer?
January 12, 2013

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...
January 12, 2013

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!
January 12, 2013

Math
Okay, thanks. Just wanted to make sure I wasn't missing anything!
January 12, 2013

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 ...
January 12, 2013

Math
Thank you!!
January 12, 2013

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...
January 12, 2013

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!
January 12, 2013

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 ...
January 12, 2013

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 ...
January 12, 2013

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...
January 12, 2013

english
try your best and most of all thik about it because I have to write the same thing.
January 8, 2013

Math
Thank you so much Reiny!!
January 8, 2013

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 ...
January 8, 2013

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.
January 7, 2013

calculus
solve the following inequality. write your solution in interval notation. x^3+9x^2-108 less than or equal to 0
December 22, 2012

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 ...
December 22, 2012

calculus
I was thinking that the asymptoes was y4,x= -6, and the domain was all real but the range I was incorrect. Thanks!
December 22, 2012

calculus
Using the function f(x)=4 - 1/(x+6)^2 A.what is the doamin? b.the range c. the asymptotes
December 22, 2012

Math
Is there another way to solve this problem? Without using π
December 16, 2012

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 ...
December 16, 2012

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