Tuesday
February 9, 2016

# Posts by Samantha

Total # Posts: 1,538

Math - Statistics
The proportion of red M&M's made is 0.24. Suppose one took a random sample of 51 M&M's. (a) What is the probability that an SRS of 51 M&M's has as its proportion of red M&M's 0.23 or below? (b) Find the 80th percentile for sample proportions of red M&M's in...
June 25, 2015

Algebra II
The sides of a triangle are in the ratio 5:12:13. Describe the length of the shortest side if the perimeter is not more than 120 inches.
June 21, 2015

chemistry
Ksp fo CaSO4 is 6.1*10?-5. how many grams of CaCl2 must be added to 500ml of 0.010M H2SO4 to just start preciptation of CaSO4? I cant figure this out at all.
June 16, 2015

Chemistry
Thanks! I got it now
June 16, 2015

Chemistry
Equilibrium constants at 25 ∘C are Substance Kc Value of Kc CaCO3 Ksp 4.5×10−9 H2CO3 Ka1 4.3×10−7 Ka2 5.6×10−11 What is the molar solubility of marble (i.e., [Ca2+] in a saturated solution) in acid rainwater, for which pH=4.20?
June 16, 2015

Chemistry
I still cant figure this out.
June 16, 2015

Chemistry
I have the molecular formula C4H4O4. and I know that there is 2 ionisable H ions but I don't know where to go from there.
June 16, 2015

Chemistry
Item 1 Maleic acid is a carbon-hydrogen-oxygen compound used in dyeing and finishing fabrics and as a preservative of oils and fats. •In a combustion analysis, a 1.054-g sample of maleic acid yields 1.599 g of CO2 and 0.327 g of H2O. •When 0.609 g of maleic acid is ...
June 16, 2015

Chemistry
What is the pH change of a 0.220M solution of citric acid (pKa=4.77) if citrate is added to a concentration of 0.155M with no change in volume?
June 16, 2015

Math
I do not understand
June 6, 2015

physics
Two metallic spheres, each with a mass of 0.46 g are suspended as pendulums by light strings from a common point. They are given the same electric charge, and the two come to equilibrium when each string is at an angle of 5.2° with the vertical. If the string is 21.0 cm ...
May 18, 2015

ART
Thank you!
May 7, 2015

ART
HEllo i need help on mixing colors because at school i dont have enough of the needed colors. So plz tell me how to mix and get : Orange Green Yellow BROWN! (For the big tree im drawing) And purple thank you and answer ASAP plz!
May 7, 2015

College Chemistry
Thank you so much
May 6, 2015

College Chemistry
Calculate the unknown of Ag+ if the potential of the following concentration cell is 300 mV at 25.0 C. Ag|Ag+(unknown)||Ag+(0.100M)|Ag I think I have to use Nernst Equation of Ecell=E0-.0592/nlogQ And at 25C is at 298K so i don't have to change anything. I am not sure if i...
May 6, 2015

Math
Is 2^9 * 3^12 * 5^6 * 7^3 a perfect cube? How do you know by just looking at it?
April 29, 2015

Social Studies
How would the Philippine government respond to an insurgency? A. the government would try to work with their members. B. the government would want to support it. C. the government would ignore it. D. the government would fight it fiercely. D?
April 21, 2015

Algebra
kyle drops a ball from a height of 15 feet above the ground. The function h = -16 f2 +15 gives the height h of the ball (in feet) after t seconds. Graph the function to determine at about what time the ball hits the ground
April 21, 2015

chemisty
A cylinder with a moving piston expands from an initial volume of 0.350L against an external pressure of 2.70atm . The expansion does 251J of work on the surroundings. What is the final volume of the cylinder?
April 20, 2015

MicroEconomics
A firm currently uses 50,000 workers to produce 120,000 units of output per day. The daily wage per worker is \$100, and the price of the firm's output is \$48. The cost of other variable inputs is \$400,000 per day. (Note: Assume that output is constant at the level of 120,...
April 19, 2015

chemistry
2 HI + Li2S2O4 ¨ H2S2O4 + 2 LiI this is what I got and it says I'm wrong? I don't understand why
April 14, 2015

chemistry
Write a molecular equation for the gas-evolution reaction that occurs when you mix aqueous hydrobromic acid and aqueous potassium sulfide.
April 14, 2015

chemistry
Write a balanced equation for the reaction between perchloric acid and lithium carbonate.
April 14, 2015

linear algebra-urgent
could you explain how you got 55/25
April 8, 2015

linear algebra-urgent
1)let w=[3;4] and u=[1;2] a) find the projection p of u onto w. I found this to be p=[1.32;1.76] b) find a scalar k for which the vector kp has a norm that is equal to one. k=? d)find a vector that is orthogonal to span{w} s=? how do I do this
April 8, 2015

history
Can you edit my editorial for grammar punctuation, spelling etc? Samantha Witkowski CHC 2D Mrs. Buyers April, 4, 2015 Aboriginal Opinion Editorial On going years of mistreatment to Aboriginals have been heavily weighed and debated amongst the Canadian government. This ...
April 3, 2015

chemistry
Hello! I am struggling a bit with this problem A gas sample occupies 51.6 L at a pressure of 0.841 atm and 39.6 ºC. What is the amount of gas (mol) in this sample?
April 3, 2015

chemistry
How many molecules (not moles) of NH3 are produced from 3.55×10−4g of H2?
April 2, 2015

chemistry
How many grams of sucrose (C12H22O11) are in 2.50L of 0.710M sucrose solution?
April 1, 2015

Chemistry
Write a balanced equation for the combustion of gaseous ethylene (C2H4), an important natural plant hormone, in which it combines with gaseous oxygen to form gaseous carbon dioxide and gaseous water
March 31, 2015

algebra
A gold ribbon is to be placed around the outside of each rectangle of the frame. Write a polynomial expression to represent the amount of ribbon needed.
March 31, 2015

itzel
i think she means simplify. If so, it would be 4/11
March 30, 2015

calc
Suppose the derivative of a function f is f '(x) = (x + 2)^4(x − 3)^7(x − 4)^6. On what interval is f increasing? (Enter your answer in interval notation.)
March 30, 2015

Criminal Justice
Is it c? Sorry these are hard
March 22, 2015

Criminal Justice
16. Conviction rates for indigent defendants and those with their own lawyers were about the same in Federal and State courts. About __________% of Federal defendants and __________% of the defendants in the most populous counties were found guilty regardless of the type of ...
March 22, 2015

Criminal Justice
I think it is A ? Would that be correct?
March 22, 2015

Criminal Justice
15. Which of the following is not an example of an ethical dilemma a defense attorney may face? A) the prosecutor's winning record. B) client perjury. C) defense receipt of physical evidence. D) a confession in confidence.
March 22, 2015

Criminal Justice
. In 1215 the __________ was signed. Its article 39 provided a basis for modern juries. A) European Charter B) Charter of Liberties C) Articles of Confederation D) Magna Carta
March 22, 2015

Criminal Justice
D ? Is this correct?
March 22, 2015

Criminal Justice
. The __________ who conquered England in 1066 used procedures that set the stage for modern juries. A) Romans B) Greeks C) Huns D) Normans
March 22, 2015

Criminal Justice
. The __________ was the first governing document in the United States. A) U.S. Constitution B) second Constitution of Congress C) Twelve Tables D) Articles of Confederation
March 22, 2015

maths
express 40% of right angle into radian measure. express two third of straight angle into radian. express sum of angles of a quadrilateral intoradian.
March 17, 2015

language arts
Why are you guys lying? You're making other people fail. The answer is A, not C. If you took the test and it's wrong then stop spreading the wrong answer along to everyone else. That's extremely happy immature.
March 11, 2015

physics
A system of 1216 particles, each of which is either an electron or a proton, has a net charge of -5.920×10-17 C. A)How many electrons are in this system (exactly)? B)What is the mass of this system (to three significant digits)?
March 10, 2015

physics
A charge q1 is inside a spherical surface (although not necessarily at the exact center of the sphere). A second charge q2 sits just outside the surface. Choose whether the following statements are true or false. T/F The total electric flux through the spherical surface ...
March 6, 2015

Biology Ms sue
1.which of the following is a renewable resource? (A.wind) B.fossil fuels C.minerals D.land 2.The goal of -----is to use cells and tissues to treat human illnesses or injuries. A.clone (B.therapeutic cloning) C.reproductive D.gene therapy
March 4, 2015

Biology
1.Which of the following is a renewable resource? A.wind B.fossil fuel C.minerals (D.land) 2.The goal of -------is to use cells and tissues to treat human illnesses or injuries. A.clone therapy B.therapeutic cloning (C.reproductive cloning ) D.gene therapy
March 4, 2015

Writing Skills Part 4
2.which of the following would most likely be an entry in a topic outline? A.Toys can be gender - neutral. *B.Toys children love C.Quality toys should require some imagination D.It's possible for toys to be both educational and entertaining. Thank you for your help Write a...
March 2, 2015

Writing Skills Part 4
1.When creating a writing plan,which of the following should come first? *A.Material that will capture the reader's interest B.The first section of the body of the essay C.A brief summary of the conclusion 2.Which two things must be accomplished by the introduction if the ...
March 2, 2015

Writing Skills Part 3
1.Under the Library of Congress system,where would you begin to research for books on the legal system of Greece? A.E B.k C.U [ D.G] 2. You've located three books on a topic you're researching for an essay.The first thing you should do in determining if any of these ...
March 2, 2015

Writing Skills Part 3
1.Under the Library of Congress system,where would you begin to search for books on the legal system of Greece? A.E B.k C.U [D.G] 2.If a source is reasonable,we know A.The information offered up-to-date,factual detailed,and precise. [B.We can trust and believe author.] C.the ...
March 1, 2015

physics
A radio station, broadcasting at 89.1 MHz on the FM dial, has two transmission towers d = 40.0 m away from each other, producing signals that are completely in phase. An avid fan of this station is listening to it on her portable radio while jogging directly toward one of the ...
February 27, 2015

Math
Find the volume of the solid that is obtained when the region bounded by the curves x=9-y^2, x=y^2+1 and y=0 is rotated about the line y=-2. (the upper shape above the x-axis)
February 22, 2015

chemistry
A student is performing an experiment to find the density of water. She obtains a 100ml beaker, which weighs 53.257 grams, and she fills it with 60 mL of water. The temperature of the water is 25.5 degrees celsius (room temperature). Again the student takes the weight of the ...
February 16, 2015

physics
Galileo's first telescope used a convex objective lens with a focal length f = 1.65 m and a concave eyepiece. When this telescope is focused on an infinitely distant object, and produces an infinitely distant image, its angular magnification is +3.11. What is the focal ...
February 14, 2015

Chemistry
The temperature of an object increases by 44.9 °C when it absorbs 3871 J of heat. Calculate the heat capacity of the object.
February 3, 2015

Chemistry
Your computer monitor has a width of 14.56 inches and a height of 10.92 inches. What is the area of the monitor display in square meters?
February 2, 2015

Chemistry
What is the mass, in grams, of a pure iron cube that has a volume of 4.30 cm3?
February 2, 2015

math
plese help
January 19, 2015

math
Every night when Samantha came home from work she put any change she had in her pockets into a jar. One day she wanted to know how much change she had in her jar. She noticed that she had two more nickels than twice the number of dimes, and eight fewer quarters than twice the ...
January 19, 2015

Health
help help
January 13, 2015

Algebra2
When using the Vertical motion model, where does the leading coefficient -16 come from? When will it not be -16 and how will you know? I'm just trying to understand the Model.
January 3, 2015

calculous (Series)
-2.02 - 2.11 - 2.2 - ... -4 Find the sum of the series
December 12, 2014

Physics
A ladder of mass M and length 6 m rests against a frictionless wall at an angle of 50 degrees to the horizontal. The coefficient of static friction between the ladder and the floor is 0.5. What is the maximum distance along the ladder a person of mass 11M can climb before the ...
December 11, 2014

Math
Find the critical points and the interval on which the given function is increasing or decreasing, and apply the First Derivative Test to each critical point f(x)= (7/4)x^4+(28/3)x^3+(-63/2)x^2-252x critical points in increasing order: c1=? min or max? c2=? min or max? c3=? ...
December 10, 2014

Math (Word Problem into formula)
A chemist is studying the properties of a bronze alloy (mixture) of copper and tin. She begins with 6 kg of an alloy that is one sixth tin. Keeping the amount of copper constant, she adds small amounts of tin to the alloy. Letting x be the total amount of tin added, define c(x...
December 8, 2014

Chemistry
To 1.0 ml of 1.5%NaCl, water is added to a final volume of 100ml. What is the molarity NaCl of this final solution? 1.5g/100ml I do not know where to go from here?
November 30, 2014

math
On May 22, 1960, a powerful earthquake took place in Chile. It had a magnitude of 9.5. How much energy did this earthquake release?
November 20, 2014

Math
If a hen lays 225 days a year, how many eggs can you eat in a day?
November 19, 2014

chemistry
10.0 mL of a Cu2+ solution of unknown concentration was placed in a 250 mL Erlenmeyer flask. An excess of KI solution was added. Indicator was added and the solution was diluted with H2O to a total volume of 75 mL. The solution was titrated with 0.20 M Na2S2O3. The equivalence...
November 19, 2014

Or
or would it be 9(sin theta - 5/9) i believe i did the work wrong
November 14, 2014

Follow up work.. I am unsure if it is the right
I know i would bring the 5 over to the other side so it would look like x = 9sin theta - 5 would I distribute the 9 to the sin and the -5? So x = 9(sin theta - 45) just confused on how to get to cos 2 theta
November 14, 2014

Math
A bag contains 6 red balls, 5 green balls and 4 yellow balls. How many balls must you take out to be sure that you have at least 3 balls of each color? I literally have no idea for this question. Should I just put 15(take all of them out to be sure?) or is there some kind on ...
November 13, 2014

UNION UNIVERSITY
Find the Z score for the weights of Middle school boys which are approximately Normal, mean = 130 lbs, Standard Deviation = 7, if Johnny weighs 148 lbs, What's his Z score?
November 12, 2014

Physics
NASA, when it sends probes to other planets, uses what is known as a gravitational slingshot. This is when a probe uses the gravitational potential energy a planet to gain kinetic energy. Even though the probe and the planet are not physically colliding, one can treat this ...
November 11, 2014

Physics
A block of mass 0.45 kg can slide over a frictionless horizontal surface. It is attached to a spring whose stiffness constant is k = 18 N/m. The block is pulled 38 cm and let go. a)What is its maximum speed? b)What is its speed when the extension is 30 cm? c)At what position ...
November 5, 2014

global studies
Like many absolute monarchs before him, Peter the Great strengthened his own power by limiting the power of Russian
October 5, 2014

Chemistry 104
A student has 10.0mL of phosphate solution that contains 1.0M PO4{3-}.The Student reacts this with excess ammonium & magnesium under basic conditions to produce 2.2034g of struvite. Calculate the % yield.
October 2, 2014

Math
Each letter in this addition problem stands for a different digit, but every letter stands for the same digit everywhere it appears. For example, all of the C's stand for the same digit. Reconstruct the problem to find the value of SCENE. CUTS +CUTS ------ SCENE
October 1, 2014

Math
Logan saves \$5.50 in dimes and quarters over a week. He has 20 more dimes than quarters. Find the number of dimes and quarters he saves. How do I solve the problem algebraically?
September 23, 2014

chemistry
Can someone please explain to me how to find the energy released? Given the overall reaction that takes place when hydrogen is burned in a young star, how much energy in MeV is released per He nucleus formed? masses: 1-H atom= 1.007amu 4-He atom= 4.002 amu positron = 5.485e-4 ...
September 19, 2014

Pre-Calculus
September 19, 2014

Algebra 3-4
The first stage of a rocket burns 28 s longer than the second stage. If the total burn time for both stages is 152 s, how long does each stage burn? Describe how you found your answer. I was originally thinking to divide 152 by 2 then add 28, but I realized that wouldn't ...
September 12, 2014

Physics
An object has a initial velocity of 10 m/s in the positive x direction. Under a constant acceleration it stops after undergoing a displacement of 148.3 m in the positive x direction. Because it is still under the same acceleration it then travels back in the negative in the x ...
September 3, 2014

Math
Why does Zara have a good driving record?
September 1, 2014

math
Yooyoullylyl
August 20, 2014

algebra
is 3.27 a rational or irrational number
August 6, 2014

college statistics
The CEO of ABC manufacturing commissioned a study to look at the differences between the current salaries of her employees (n = 474) and their starting salaries. The study collected current and beginning salary data for each of the 474 employees and the researcher conducted a ...
July 20, 2014

science
A runner whose mass is 49 kg accelerates from a stop to a speed of 6 m/s in 3 seconds. (A good sprinter can run 100 meters in about 10 seconds, with an average speed of 10 m/s.) (a) What is the average horizontal component of the force that the ground exerts on the runner'...
July 17, 2014

physics
An object with mass 110 kg moved in outer space. When it was at location < 11, -35, -7 > its speed was 17.5 m/s. A single constant force < 230, 420, -230 > N acted on the object while the object moved to location < 16, -41, -13 > m. What is the speed of the ...
July 5, 2014

math
Mike's number is 2000 more than Jerry's which is 400 less than Barry's. Larry's number is 1500 more than Sam's, which is 443. Sam's number is 60 less than Barry's. WHat is each boy's number?
June 17, 2014

math
Mike's number is 2000 more than Jerry's which is 400 less than Barry's. Larry's number is 1500 more than Sam's, which is 443. Sam's number is 60 less than Barry's.
June 17, 2014

algebra
A pet boarding facility wants to build two adjacent pens of equal size. They are using the length of the dog kennel as one side of the two pens. They have 324 feet of fencing to build the pens. What width should he make the pens to maximize the total area of the pens?
May 31, 2014

Math
When rolling a standard number cube twice, what is the probability of rolling two even numbers? I'm pretty sure the answer is 1/4, but the solutions says that this is wrong.
May 24, 2014

statistics
A pop-music record firm wants the distribution of lengths of cuts on its record to have an average of 129 seconds and a standard deviation of 10 seconds so that disc jockeys will have plenty of time for commercials within each 5-minute period. The population times for cuts is ...
May 17, 2014