A teacher graded the tests for each of her students. She calculated a mean grade of 80 and a standard deviation of 3. One of her students, Katrina, had a z-score of 2. What grade did Katrina get on the test?
May 10, 2015
local students were surveyed about adding stoplights at the corner of Main Street and Perry Avenue. Determine whether each survey question may be biased. Explain A) are stoplights needed at the intersection of Main and Perry? B) should stoplights be installed at the corner of ...
April 20, 2015
(a) What type of ion chromatography (cation or anion) will you use to separate the following ions: Cu2+, Fe3+, Ag+ and Na+ . I'm having trouble here as I know that in elution chromatography they use like charges to separate ions, but is that the same case in ion-exchange...
February 2, 2015
Comment on the order of elution of the following solutes in (a) normal-phase and (b) reversed-phase liquid chromatography. Give reasons for the difference. Solute X nonpolar Solute Y polar, a dipole Solute Z polar, more polar than Solute Y
January 24, 2015
ART check answers please
1. A museum professional has been working extended hours to remove dirt and grease that a vandal left on a painting. This professional is most likely an a)curator b)conservationist*********** c)historian d)archaeologist 2. Pick the statement that best describes why the museum...
January 24, 2015
Now how far the will the ball in the problem below will hit the ground? a. 10m b. 6.4m c. 9.6m d. 20m e. 140m a ball rolls off the table top 2m tall. with a velocity of 10m/s. with what speed will it strike the ground? V^2 = Vo^2 + 2g*h V^2=0^2+2*9.8*2 V^2=39.2^2 v=6.3m/s
January 4, 2015
a wooden block of mass equal to 15kg is pressed against a spring. The spring has constant of 225N/m. If the spring is compressed 0.15m, how fast will the block travel when released?
January 4, 2015
A fence is to be built to enclose a rectangular area of 310 square feet. The fence along three sides is to be made of material that costs 3 dollars per foot, and the material for the fourth side costs 14 dollars per foot. Find the dimensions of the enclosure that is most ...
December 11, 2014
A dart gun is aimed horizontally at the center of a large target 150 m away. The initial velocity of the dart is 450 m/s. (Ignore air resistance) a) Where does the dart strike the target (relative to the center of the target)? b) To hit the center of the target the dart must ...
December 6, 2014
a mixture of 39.8g containing potassium chloride and potassium trioxochlorate (v) upon heating, the residue weighed 28.7g what is the percentage mass of potassium chloride in the residue?
November 21, 2014
In this problem you will estimate the heat lost by a typical house, assuming that the temperature inside is T(in) = 20 degrees celcius and the temperature outside is T(out) = 0 degrees celcius. The walls have fiberglass insulation, which dominates the heat conduction ...
November 6, 2014
Anatomy and Physiology
There are many disease, disorders, syndromes that attack the muscular system such as muscular dystrophy, hypotonia, polio, etc. Because of our research facilities and advanced medical care in the United States, many of the people in our country who are victims of these ...
October 19, 2014
Two forces parallel to the x axis do 17.2 J of work on a small tray while moving it 19.0 m in the x direction across a gym floor. One of the forces has a value of +3.93 N in the x direction. What is the other force?
October 14, 2014
A 0.200 kg ball sits on a shelf 2.00 meters from the floor and then falls to a point 1.00 meter from the floor ignoring any affects due to fiction at this position_______
May 30, 2014
Physics quick help please
6. If 4.0 × 1018 J of work done on a point charge changes its electric potential difference by 25.0 V, then what is the magnitude of the charge? (Points : 1) 1.6 × 101^9 C 4.0 × 101^9 C 1.6 × 101^8 C 4.0 × 101^8 C 7. Two parallel plates have an ...
May 1, 2014
Research studies indicate that the referral approach is effective because: A. customers seldom trust a salesperson, but do trust a third party. B. customers may be far more impressed with your good points if they are represented by a third party, rather than by you. C. ...
April 30, 2014
What is a quartic function with only the two real zeros given? x = -4 and x = -1 A. y = x^4 + 5x^3 + 5x^2 + 5x + 4 B. y = x^4 - 5x^3 - 5x^2 - 5x - 4 C. y = -x^4 + 5x^3 + 5x^2 + 5x + 4 D. y = x^4 + 5x^3 + 5x^2 + 5x - 5
March 24, 2014
The velocity (feet per second) of an object is given by the equation v = 3(2t + 1)0.4. What is the equation for the acceleration of the object? What is the equation for the displacement of the object? The displacement is initially 25 feet. What are the values of the ...
March 12, 2014
The voltage (in volts) induced in a coil of wire is v = (2t + 1)^0.5. The current in the coil is initially 0.3 amps, and the inductance is 5H. What is the equation for the current in the coil?
March 11, 2014
A golfer, standing on a fairway, hits a shot to a green that is elevated 5.50 m above the point where she is standing. If the ball leaves her club with a velocity of 46.0 m/s at an angle 0f 35.0º above the ground, find the time that the ball is in the air before it hits ...
February 17, 2014
Quad ABCD with diagonal DB. <adc=90, <c=91, <cbd=43. segment ad=segment dc=9. Which segment is longer ab or ad and why? steve, how are you solving for <abd, what are you assuming about <abc?
January 24, 2014
Thank you steve, but something must be wrong with this problem. We have not learned law of cosines or law of sines yet and the correct answer is ad?? Baffled at how to get this based on what we are studying, SAS and SSS inequality theorems.
January 24, 2014
MAA Global Science
A lump of ice falls from a jet plane as it tries to land at an airport. If the ice hits the ground with a vertical speed of 85m/s, what was the height of the plane when the ice fell off.
December 13, 2013
Find the missing numbers for the dimensions and measures of a rectangular prism... Length ? Width 7 m Height 5 m Surface Area 214 m to the second power Volume ? Please answer the one's with a ?. Thank you.
December 6, 2013
Let's say a company is manufacturing juice boxes that are rectangular prisms with dimensions 4 inches by 3 inches by 4 inches. The company has a warehouse whose dimensions are 40 feet by 30 feet by 20 feet. If the company makes 200,000 juice boxes, will it be able to store...
December 5, 2013
Help Please!!!- Physics
A plane flies due north (90° from east) with a velocity of 100 km/h for 3 hours. During this time, a steady wind blows southeast at 30 km/h at an angle of 315° from due east. After 3 hours, where will the planes position be relative to its starting point? Show ...
November 22, 2013
A juggler throws a ball straight up into the air and it takes 2.80 seconds to reach its peak. How many seconds will it take after that to fall back into his hand? Assume he throws and catches the ball at the same height.
October 21, 2013
Ginny has two quarters. For every week that Ginny does all of her chores, her mother increases the amount of money Ginny has exponentially. The equation y=0.5*3^x represents the amount of money that Ginny has after x weeks of doing all of her chores. What does the term 3^x ...
October 2, 2013
Debbie finished her algebra test early so she decided to check each of her answers. After checking her answer to question #10, she realized she made a mistake in her solution. In which step does Debbie make her mistake? Original Equation: 2 + 3y = 5(y - 2) Step One: 2 + 3y = ...
September 25, 2013
A certain ball is dropped from an altitude of 1 meter and rebounds one-half of it's previous altitude. What is the total distance the ball has traveled when it hits the floor the 40th time?
September 5, 2013
A swimmer heads directly across a river, swimming at 1.9 m/s relative to the water. She arrives at a point 50 m downstream from the point directly across the river, which is 79 m wide. (a) What is the speed of the river current? m/s (b) What is the swimmer's speed relative...
August 1, 2013
A student runs through a field 100m(E) then 200m(S) and finally 50(45 degrees S of E find his final position relative to his starting point? please explain steps Answer is 272(60 degrees S of E)
July 4, 2013
Jim is 100m(S) of Paul. Paul begins to walk east at 2.0m/s the same time Jim begins to walk west at 3.0m/s. what is the displacement of Jim from Paul 20 seconds later? Please explain steps Answer is 141(SW)
July 4, 2013
A bag contains 9 blue marbles and 1 green marble. What is the probability of drawing a blue marble followed by a green marble, without replacing the first marble before drawing the second marble? Is the answer 1/9?
May 30, 2013
i have to prepare for my IIT-JEE examination. But i have no knowledge about the books for preparation. Please tell me some books for the preparation of objectives for IIT-JEE. Now i am in 10+2 class.
May 7, 2013