Questions Asked on
June 30, 2014

chemistry
determine the % of water of crystallization in pure sample of green vitriol (FeSo4.7H2O)

science
A body freely falling from a height h describes 11h/36 in the last second of its fall. Find the height h?

Statistics
Find the critical value za/2 that corresponds to the given confidence level. 96%

Statistics
Compute the critical value za/2 that corresponds to a 85% level of confidence.

statistics
A Gallup poll of 1236 adults showed that 12% of the respondents believe that it is bad luck to walk under a ladder. Consider the probability that among 30 randomly selected people from 1236 who were polled, there are at least 2 who have that belief. Given

physics
a bullet travelling horizontally at a speed of 350 m/!@#$%^&s a board perpendicular to the surface, passes through it and emerges on the other side at a speed of 210 m/s . if the board is 4.00 cm thick, how long does the bullet takes to pass through it ?

Math
1. Determine the equation of the right bisector of the line segment E(2, 6) and F(4, 2). Draw the diagram. 2. Given three points D(2, 5) E(2, 3) and F(4, 6) determine whether or not the line through D and E is perpendicular to the line through E and F.

math
Certain investments compound interest at different intervals. What effect does the size of the compounding interval have on the yield of the investment?

Statistics
An unbiased die is thrown seven times. Find the probability of throwing it at least five six's.

Math
In a hardware store the ratio of shovels to rakes is 3:5. If there are 10 more rakes than shovels, how many rakes are there in the hardware store? I know shovels = r10 but don't know where to go from there?

Chemistry
Consider the following reaction: 4NH3 + 7O2 (arrow) 4NO2 + 6H2O. A) How many moles of NH3 react with 5.64 mol of O2? B)How many moles of NO2 are obtained from 3.27 mol of O2? C) How many moles H2O will be produced from 8.95 g of NH3? D)How many grams of

Macroeconomics
You are running a small yard maintenance business for the summer. What do you expect to happen to the number of yards you can maintain in a day as you add workers if you don’t purchase more capital equipment (like mowers and leaf blowers)? Provide two

LiteratureHelp me Ms. Sue
A theological argument offered by Donne in "Death Be Not Proud" may be summarized as? A. chance and fate rule all. B. life is illusion C. death cannot be overcome D. the human essence is immortal. I think it's C.

Statistics
Many states are carefully considering steps that would help them collect sales taxes on items purchased through the Internet. How many randomly selected sales transactions must be surveyed to determine the percentage that transpired over the Internet?

statistics
Assume that a procedure yields a binomial distribution with a trial repeated n times. Use a binomial probabilities table to find the probability of x successes given the probability p of success on a given trial. n=8, x=2, p=0.30

exercise physiology
calculate the total amount of work performed in 5 minutes of exercise on the cycle ergometer given the following flywheel 25n cranking speed 60rpm distance travel 6meters

Math
A dress is on sale for a 15% discount, meaning 85% of the price remains. If the sale price of the dress is $51, then the original price of the dress was $.

Statistics
A statistics professor plans classes so carefully that the lengths of her classes are uniformly distributed between 50.0 and 52.0 minutes. Find the probability that a given class period runs between 50.25 and 50.5 minutes.

Physics
Four point charges are at the corners of a square of side a as shown in the figure below. Determine the magnitude and direction of the resultant electric force on q, with ke, q, and a left in symbolic form. (Let B = 2.5q and C = 8q. Let the +xaxis be

college physics
A block of mass 21.5 kg supported by a vertical massless cable is initially at rest. The block is then pulled upward with a constant acceleration of 3.79 m/s2. what is the tension in the cable? what is the magnitude of the net force acting on the mass?

Finance
.An investor in the 28 percent tax bracket is trying to decide which of two bonds to select: one is a 5.5 percent U. S. Treasury bond selling at par; the other is a municipal bond with a 4.25 percent coupon, which is also selling at par. Which of these two

biomechanics
During a biceps curl, the elbow's relative angle during flexion changes from 3° to 157°. During an 8 repetition set, what is the total angular distance and displacement at the elbow in degrees and radians?

Math
An arc of a circle subtends an angle of 54 at the centre. If the arc is 9cm long, calculate the circumference of the circle.

social studies
Which answer best describes why towns and cities were built around railroads and canals? The government and transportation companies planned to build the cities. The canals and railroads were designed to pass through areas well suited for towns. People who

economic
Management and ownership of business are separate A) Sole Proprietorship B) Corporation C) Partnership I said a

Soil Chemistry
In saturated soils, oxygen is quickly depleted and microbes must utilize the next most favorable electron acceptor, in this case sulfate (SO42). Under these conditions, Mn (and Fe) are oxidized to Mn2+ (and Fe2+). Select the correct oxidation and

Soil Chemistry
Chlorine is widely used to treat municipal water supplies and swimming pools. If the volume of a sample of Cl2 gas is 8.73L at 755mmHg and 24.0C, how many grams of Cl2 gas are in this sample? This is one of those multi step problems that I get lost....I

algebra
42 < –6d A. d < –7 B. d < 36 C. d > –7 D. d < –48 i really need help with this i don't get it

math
In an examination a candidate is given the four answers to four questions but is not told which answer applies to which question. He is asked to write down each of the four answers next to its appropriate question. b). show that there are 6 ways of getting

Criminal Justice/Corections
Restitution does NOT help: A. an offender to accept personal responsibility. B. offset the victim's physical and emotional losses. C. the victim to feel more respected by the system. D. a victim to take revenge on his or her offender. I think it's D., but

E
what is the angle of rotation about D when the measure of the acute angle between lines m and n is 36 degrees

Math
Sara had just rented her first apartment starting December 1 before beginning college in January. The apartment had washer and dryer hookups, so Sara wanted to buy the appliances to avoid trips to the Laundromat. The Saturday newspaper had an

Stat
three identical chips, each with 0 on one side and 1 on the other, are the tossed simunltaneously. a. write the sample space

Stat 214
Three identical chips, each with 0 on one side and 1 on the other, are to be tossed simultaneously. A. writes the sample space. B. what is the probability of observing the sum of the faceup numbers to equal to 2? C. What is the probability of observing

statistics
simple randon sampling uses a sample size n

Criminal Justice/Corrections
Restitution does NOT help: A. an offender to accept personal responsibility. B. offset the victim's physical and emotional losses. C. the victim to feel more respected by the system. D. a victim to take revenge on his or her offender. I think it's D., but

bussines studies economics accounting maths literacy
which job career do i qualify for?

algebra
What are the possible side of the rectangle with area of (x2 + 8x) cm2 using CMF?

math
An Algebra I test contains 40 questions. Some of the questions are worth 4 points each, and some are worth 2 points each. The total test is worth 100 points. Let f represent the number of questions worth 4 points and t, the number of questions worth 2

Non
How many US gallons of fuel will a tank 66 in threequarter inch by 132" x 10" whole

Criminal Justice/Corrections
All of the following istuations contributed to the rapid increase in the number of imprisioned offenders after the 1970's EXCEPT: A. The War on Drugs. B. The "babyboom" C. Political inaction D. Enactment of more stringent punishments. My textbook mentions

Calculus I
Hello! I am not sure why I am getting this problem wrong, and I keep getting six. Could someone be kind enough to show me how it's done? Thank you very much in advance! Find the limit. Use l'Hospital's Rule if appropriate. lim ((5x − 2)/(5x + 4))^(5x +

algebra
x=5 4X9/3X

math
Subtract five and twofifths minus two and ninetenths. Justify your steps.

chemistry
How many grams of calcium nitrate (molar mass = 164 g) would be formed if 0.500 g of calcium chloride (molar mass = 111 g) were reacted with an excess of silver nitrate (molar mass = 170. g

Math
3/4 multiply by 0 multiply by 1/2

physics
A girl inside a room is looking at the window and sees a volleyball passing outside the window of width w and height d. The ball appears from the upper left corner A of the window and disappears at the lower right corner B in t0 second. The girl knows that

Chemistry
A solution of calcium nitrate, Ca(NO3)2, reacts with a solution of ammonium fluoride, NH4F, to form solid calcium fluoride, CaF2, and ammonium nitrate, NH4NO3(aq). When 45.00 mL of 4.8724 x 101 M Ca(NO3)2 solution was added to 60.00 mL of 9.9981 x 101 M

Chemistry
A solution of calcium nitrate, Ca(NO3)2, reacts with a solution of ammonium fluoride, NH4F, to form solid calcium fluoride, CaF2, and ammonium nitrate, NH4NO3(aq). When 45.00 mL of 4.8724 x 101 M Ca(NO3)2 solution was added to 60.00 mL of 9.9981 x 101 M

Chemistry
A solution of calcium nitrate, Ca(NO3)2, reacts with a solution of ammonium fluoride, NH4F, to form solid calcium fluoride, CaF2, and ammonium nitrate, NH4NO3(aq). When 45.00 mL of 4.8724 x 101 M Ca(NO3)2 solution was added to 60.00 mL of 9.9981 x 101 M

Chemistry
A solution of calcium nitrate, Ca(NO3)2, reacts with a solution of ammonium fluoride, NH4F, to form solid calcium fluoride, CaF2, and ammonium nitrate, NH4NO3(aq). When 45.00 mL of 4.8724 x 101 M Ca(NO3)2 solution was added to 60.00 mL of 9.9981 x 101 M

algebra
Fiberoptic cables are used widely for internet wiring, data transmission, and surgeries. When light passes through a fiberoptic cable, its intensity decreases with the increase in the length of the cable. If 1500 lumens of light enters the cable, the

Chemistry
A student synthesized 6.895 g of barium iodate monohydrate, Ba(IO3)2*H2O by adding 30.00 mL of 5.912 x 101 M barium nitrate, Ba(NO3)2, to 50.00 mL of 9.004 x 101 M sodium Iodate, NaIO3 whats the percent yield?

Chemistry
When reviewing the procedure the student found that 4.912 x 101 M barium nitrate solution had been used instead of that in the following procedure: A student synthesized 6.895 g of barium iodate monohydrate, Ba(IO3)2*H2O by adding 30.00 mL of 5.912 x 101

math
Find the distance between the following points: (2,4),(3,2)

10 gr math
Plug in the information into the Distance Formula: D = sqrt((x_2  x_1)^2 +(y_2  y_1)^2)

math
A balloon is released and flies straight up for 4 miles, and then the wind blows it west for 4 miles. Find the distance between the balloon and the site where it was released.

grammar
In the sentence  "Tom could see the anger in Mr. Adams' face." is "Mr. Adams' face" a compound noun? I know Mr. Adams' is a possessive noun and face is a common noun but I am supposed to list compound nouns. Same with the sentence "The Team lost their

geometry
The endpoints of a line segment are (2, 5) and (8, 13), determine the midpoint of the line. x_m = (x_1 + x_2)/2

Physics
A 20 kg box approaches the foot of a 30 degree inclined plane with a speed of 10 m/s. the coefficient of friction between the box and the inclined plane is 0.2. (a) How far up the inclined plane will the box go? (b) If the box slides back down the inclined

Statistics
A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study 320 babies were born, and 256 of them were girls. Use the sample data to construct a 99% confidence interval estimate of the percentage of girls born.

Statistics
Find the critical values x2L and x2R that correspond to the given confidence level and sample size. 99%: n=23

Statistics
The distribution of IQ scores is a nonstandard normal distribution with a mean of 100 and a standard deviation of 15. What are the value of the mean and standard deviation after all IQ score have been standardized by converting them to z scores?

Statistics
Assume that a procedure yields a binomial distribution with a trial repeated n times. Use the binomial probability formula to find the probability of x successes given the probability p of success on a single trial. n=21, x=18, p=0.75

Criminal Justice/Corrections
Which of the following statements is NOT true about the benefits of intermediate sanctions? A. Channeling offenders into communitybased corrections increase and accelerate prison overcrowding. B. Intermediate sanctions are generally less expensive than

Statistics
An investor has $1400 to invest, and his financial analyst recommends two types of junk bonds. The A bonds have a 6% annual yield with a default rate of 3%. The B bonds have a 9% annual yield with a default rate of 7%. (If the bond defaults, the $1400 is

physics
A car traveling at2.24m/s skids and stops in 2.55s determine the skidding distance of car

math
how 20 people are divide in 7 days such that each day gets an odd?

Maths
Find the derivative of y=1/x at x=1/4 Answer: 1/1/16

finance
The price of Garden Designs, Inc. is now $ 85. The company pays no dividends. Sean Perth expects the price four years from now to be $ 125 a share. Should Sean buy Garden Designs if he wants a 15 percent rate of return? Explain

Psychology
What is Classical Hierarchial Classification?

math
To discourage guessing, Mrs. Lopez made a test  grading scheme shown at the right. On a 100item test, Jessa left 11 answers blank and answered and 48 question correctly. What is her score? It is problem solving involving addition in integers

math
2. Find two consecutive prime numbers less than 40 such that the sum of their opposites 5. 3. Insert plus (+) or minus () on the digits 1 to 9 asshown to obtain 100. 1 2 3 4 5 6 7 8 9. How many can you form?

physics, science
What effect does friction have upon a) ball bounce angle, and b) ‘speed’ of the court? Refer to clay and grass courts to help illustrate your answer. (4 marks) please help!

trigonomety
FIND THE HEIGHT OF A TREE,IF 120 FT. FROM ITS BASE THE ANGLE OF ELEVATION OF ITS TOP IS 10 DEGREE 18 MINUTES

math
Sin^6x sin^2 4x =sin2x sin10x

ALGEBRA
Solve This Problem. 8n 12  5n = 21

physics
pilots can survive radial acceleration up to 9g(88m/s^2). can a fighter pilot flying at a constant speed of 500m/s and in a circle that has a diameter of 8800 m survive to tell about his experience?

calc
evaluate the integral from 4 to 5. (x^3 3x^2 9)/(x^3 3x^2)

science
A 25 kg box is being pushed across the floor by a constant force ‹ 100, 0, 0 › N. The coefficient of kinetic friction for the table and box is 0.15. At t = 6.0 s the box is at location ‹ 14, 3, −4 › m, traveling with velocity ‹ 6, 0, 0 › m/s.

mathematics
A rectangular house with 60*50 feet dimension has a rectangular wall surrounding the garden around the house.the area of garden is same as area of house.so how far is wall from the house?

Algebra
Quick Question, when would an inequality like this work: x^2  4x >or equal to 0? ...What would I have to do to figure out when this would and would not work?

Criminal Justice/Corrections
Which of the following is NOT helpful to a judge in determining potential risk? A. The PSI B. STICS C. A risk and needs assessment D. The LSIR I find all in my textbook except for STICS. So I think that is the answer.

Algebra
Quick Question, when would an inequality like this work: x^2  4x >or equal to 0? ...What would I have to do to figure out when this would and would not work?

Math
Add the quotient of 4/7 divided by 4/5 to the product of 4/7 multiply by 5/8