Monday
May 2, 2016

# Posts by jessica

Total # Posts: 3,091

Biology
Can someone provide an example of positive and negative control in a very easy and simple example?
December 4, 2013

Math
the area of a yard is 420 ft. what is the probability that any leaf landing in the yard will land ina circular wading pool that has a diameter of 14 ft?
December 4, 2013

Calculus
The first boat is sailing towards the North at the speed of 6 km per hour and sees that another boat is heading east at the speed of 5 km per hour. The second boat is to the northwest of the first boat. what is the minimum distance between two boats, assuming that they do not ...
December 3, 2013

Math
2/5 is 0.4. Multiply by 100, you get 40% -> 40% of the figure is shaded. so the percentage of the figure that is not shaded is 100% - 40% = 60%
December 3, 2013

health
what does hiv stand for
December 2, 2013

maths probability
Consider an experiment with four possible outcomes which we denote by Wi for i = 1,2,3,4. Sample space is Omega = {w1,w2,w3,w4}. Consider events A= {w1}, B = {w1,w2}, C = {w1,w2,w3} and D = {w2,w4}. Given that P(A) = 1/10, P(B) = 1/2, P(C) = 7/10, compute P(D)
November 28, 2013

Chemistry
At a certain temperature, the Kp for the decomposition of H2S is 0.774. H2S(g) <---> H2(g)+S(g) Initially, only H2S is present at a pressure of 0.120 atm in a closed container. What is the total pressure in the container at equilibrium?
November 26, 2013

math
Nancy made the following statement: The range of f(x) = ax + b is the set of all real numbers given that a and b are real numbers. Which produces a counter example to her statement? b = 0 a = 0 b < 0 a < 0 i think its a=0 please help
November 26, 2013

chemistry
consider the following reaction at 298K 4Al(s)+3O2(g) yields 2Al2O3(s) delta H= -3351.4 Kj find delta S sys find delta S surr find delta S unvi
November 20, 2013

Chemistry
A student ran the following reaction in the laboratory at 650 K: H2(g) + I2(g) 2 HI(g) When she introduced 0.204 moles of H2(g) and 0.229 moles of I2(g) into a 1.00 Liter container, she found the equilibrium concentration of I2(g) to be 5.77E-2 M. Calculate the equilibrium ...
November 19, 2013

Chemistry
A student ran the following reaction in the laboratory at 327 K: CH4(g) + CCl4(g) 2 CH2Cl2(g) When she introduced 4.07E-2 moles of CH4(g) and 7.57E-2 moles of CCl4(g) into a 1.00 Liter container, she found the equilibrium concentration of CH2Cl2(g) to be 1.21E-2 M. Calculate ...
November 19, 2013

Chemistry
A student ran the following reaction in the laboratory at 651 K: 2 NH3(g) N2(g) + 3 H2(g) When she introduced 8.75E-2 moles of NH3(g) into a 1.00 Liter container, she found the equilibrium concentration of H2(g) to be 0.119 M. Calculate the equilibrium constant, Kc, she ...
November 19, 2013

Physics
A rifle shoots 50.0 gram bullet with a muzzle a velocity of 350 m/s. How fast would a 80.0 kg person have to run in order to have the same amount of kinetic energy as the bullet in flight? If the bullet is shot vertically, what is the the maximum height about the gun barrel ...
November 19, 2013

Physics
A 1000 kg car is going 8.90 m/s has a minimum braking distance of 6.0 meters. Find the average braking force exerted on the car during the stopping process.
November 19, 2013

english-project
Hi!I am doing project, its about making the world a better place for humans. I have to join organizations online and subscribe t email lists to get action updates-issues like anti-war/peace, social justice and environments, animals, food water and democracy. Please tell me ...
November 12, 2013

chemistry
MASS (GRAMS) Nac1- 0.9992 C12H22O11- 0.9822 NH4C1- 0.9510 C6H5OH- 0.9723 C9H20- 1.0038 *Find the Molar Mass (g/mol) for each * *Find the Moles of each element for each * *Find the Atoms of each element for each * - if possible show work and or equation set up to find answers
November 8, 2013

Psychology
November 6, 2013

Psychology
Which of the following variables are independent and dependent? 1. Personality and Gender 2. Happiness 3. Scores
November 6, 2013

Math/Infinity
Explain why the union of two countably infinite sets with nothing in common is also countably infinite. I said that it was because the two sets are in one-to-one correspondence with each other. Is this right?
October 31, 2013

Thomas Nelson
Check out definr (dot) com just type in chromatin and see what comes up
October 31, 2013

english
What literary work is this from? You will need to post the lines in order for people to understand your question.
October 31, 2013

physics
A projectile launched straight upward at 141 m/s. How fast is it moving at the top of its trajectory? Suppose it is launched upward at 45° above the horizontal plane. How fast is it moving at the top of its curved trajectory?
October 31, 2013

Math/Infinity
Split the natural numbers into three sets A, B, and C so that the sets have nothing in common, they each are countably infinite, and A U B U C = the set of natural numbers. So here's what I got A: 2,4,6,8,10... B:1,3,5,7,9... C: ? I don't know what to do for C because ...
October 30, 2013

Chemistry
When the stopper of the Erlenmeyer flask is loosened before weighing, why doesn't the carbon dioxide escape? Why isn't the mass of air displaced by the water taken into account when the the mass of water is determined?
October 27, 2013

program planning
Please respond to the following questions either by writing the design name or by describing the design using standard notation (X= program, O=Observation, R=random assignment. For each design, please discuss all threats to internal validity. 1. Design: Single group post-test ...
October 26, 2013

Science
Trini adds 10g of baking soda to 100g of vinegar. The mixture begins to bubble. When the bubbling stops, trini finds the mass of the resulting mixture. She determines its mass is 105g. Why has the mass changed? A. A gas has formed and left the mixture B. Vinegar evaporated ...
October 20, 2013

Math (Algebra 1)
use the cylinder formula and 3.14 time 4 times 4 times 6 then the answer to that is the answer to your problem
October 20, 2013

Science
I think it is A
October 20, 2013

Science
Which of the following is an example of how economics can affect science? A. Limited funding may lead scientists to research one topic instead of another. B. Legislators may create new laws about the use of natural resources based on the recommendations of scientists. C. A ...
October 20, 2013

history
I haven't found anything besides how women went into the armed forces and helped the country.
October 18, 2013

history
how is America's involvement in WW2 relevant to today?
October 18, 2013

October 15, 2013

(History)
What specific challenges did the South Vietnamese face as they tried to flee Vietnam in 1975?
October 9, 2013

Math
I thought Huong had to spend \$3.42 because I multiplied \$.03x9 and got \$.27 and then I multiplied \$.03x3 and got \$.09. I also multiplied \$.03x7 and got \$.21, then I added them and got \$.57. Finally I multiplied \$.57x6 (by the number of sides of the box) and got \$3.42. However...
October 9, 2013

64.8% Of students went to the football game are the other half was busy . Can you multiply to get the answer
October 7, 2013

geography
this doesn't really answer my question...
October 1, 2013

geography
what does mexico's city site on top of the aztec city suggest about the location?
October 1, 2013

Geography (Ms. Sue)
These countries are located in the western part of the continent.
October 1, 2013

Health
What is intensity?
October 1, 2013

chemistry
What is the major difference between the two-dimensional and three- dimensional models of ethane and methane? When might you choose to use a two-dimensional model rather than a three-dimensional model when representing one of the molecules?
September 30, 2013

Finance
You take out a 30 year \$100000 mortgage loan with an apr of 6% and monthly payments. In 12 years you decide to sell your house and pay off the mortgage. What is the principle balance on the loan?
September 28, 2013

social studies
in 1777 who commanded the American soldiers who captured 5,800 british soldiers under general burguyne at Saratoga?
September 25, 2013

chemistry
Table salt, NaCl(s), and sugar, C12H22O11(s), are accidentally mixed. A 4.00-g sample is burned, and 3.30 g of CO2(g) is produced. What was the mass percentage of the table salt in the mixture?
September 22, 2013

Math
The population of New York doubles during the workday. At the end of the workday, the population decreases by half. If the population in New York City is roughly 4,000,000 people before rush hour, and the morning rush hour lasts 3 hours, what would be the population if the ...
September 21, 2013

You are the buyer for the shoe outlet. You are looking for a livie of mes shoes to retail for \$49.95 if your objective is a 55% markup based on selling price, what is th most that you can pay for the shoes and still get the desired markup?
September 19, 2013

Carousel Toys has ramper buckaroo wooden rocking horse for toodlers on a 30% markdown sale for 72.09 each what was the original price before they were markdown?
September 19, 2013

The flour power bakery makes 200 cherry cheese cakes at a cost of 2.45 each. If a spoilage rate of 5% is anticipated at what price should the cakes be sold to achieve a 40% markup based on cost?
September 19, 2013

Epicure market prpares fresh gourmet entrees each day. On wednesday, 80 baked chicken dinner were made at a cost of 3.50 each
September 19, 2013

Whawas the orginal selling price of a trendmill curently on sale for 2,484 after a 25% markdown?
September 19, 2013

You are shopping for an executive desk chair at the furniture Gallery. You see two you like on sale Chair A was originally \$119.99 now on sale for \$ 79.99 and chairB
September 18, 2013

Bloomingdales purchases imported perfume for \$24.30 per ounce. If the store policy's to mark up all merchadise in that department 39% based on selling price, what is the retail selling price of the perfume?
September 18, 2013

What is the percent markup based on selling price for the Western Wear shirts?
September 18, 2013

Wyatt's western wear purchases shirts for \$49.50 each. A \$34.00 markup is added to the shirt. What is the selling price?
September 18, 2013

math
jim paddle from one shore of a lake three miles wide at 4 mph, and john paddles from the opposite shore at 5 mph. how long will they travel before they meet?
September 17, 2013

This 35-year-old female patient has carcinoma of the upper-outer left breast. She had a lumpectomy performed and a sentinel lymph node biopsy of the axillary lymph node. The pathology report for the lymph node states no pathological change.
September 13, 2013

Science
what is a device that does work in a electrical current? A. load B. turbine C. charge D. Magnet
September 12, 2013

health
Genital HSV-1 outbreaks recur less regularly than genital HSV-2 outbreaks. The answer is c. I took this test and got it right.
September 12, 2013

Arturo Muina is the captain o a charter fishing boat. He is paid a salary of \$140 per day. He also averages tips amounting to 12% of a \$475 daily charter rate. Last month during a fishing tournament, Arturo worked 22 days. What wre his total gross earnings for the month?
September 8, 2013

Spencer Morris works in the telemarketing division for a company that pays a salary of \$735 per month plus a commission of 3 1/2 of all sales greater than \$15,500. If he sold \$4,900 last month, what was his total gross pay?
September 8, 2013

Foremost fish market pays a straight commission of 18% on gross sales, divided equally among the three employees working the counter. If foremost sole \$22,350 in seafood last week, how much was each counter employee's total gross pay from this?
September 8, 2013

math
Mitch Anderson is a security guard. He earns \$7.45 per hour for regular time up to 40 hours time and a half for overtime and double time f or the midnight shift. If mitch worked 56 hours last week, including 4 hours on the midnight shift, how much were his gross earnings?
September 8, 2013

Math
I'm pretty sure it goes something like: 3/5 = 3➗5 (sorry if that's a box, it's supposed to be a division sign) = 0.6 50*0.6= 30 5th grade students ________________________________________ Another way to think about it is if the denominator is the same as the...
September 4, 2013

Math
Thanks so much!!!!!! That was the only problem I had trouble on.
September 4, 2013

Math
This is Translating Problems into Equations: (a) Ms. Dixon had a 25ft ribbon that was cut into two peices. (b) One piece is 6ft longer than the other. Ms. Dixon --> Ribbon/Pieces --> Equation -->
September 4, 2013

They are all correct great job for not getting LCM and GCF mixed up! I used to get them mixed up all the time when I was in 6th grade.
September 4, 2013

Math
I'm not sure so maybe the numbers on the question are wrong but thanks for the help anyway.
September 3, 2013

Math
Nia and Trey both had a sore throat so their mom told them o gargle with warm salt water. -Nia mixed 12 teaspoon salt with 3 cups of water. -Trey mixed 12 teaspoons salt with 112 cups of water. Nia tasted Trey's salt water.She said," I added more salt so I expected ...
September 3, 2013

physics
a car travels 40 miles at an average speed of 80 mph and then travels 40 miles at an average speed of 40 mph. The average speed of the car for this 80 mile trip is: A) 80 mph B) 72.5 mph C) 60 mph D) 53.3 mph E) 40 mph
September 2, 2013

physics
which of the following situations are impossible : A) velocity negative, acceleration positive B) velocity positive , acceleration negative C) velocity increasing, acceleration negative D) velocity decreasing , acceleration zero E) velocity negative , acceleration negative
September 2, 2013

College chemistry math ratio problem
Earlier you determined that the proper ratio of packages of buns, packages of patties, and jars of pickles is 3:2:4. If you want to feed at least 540 people, but also maintain the proper ratio, what minimum number of packages of buns, packages of patties, and jars of pickles ...
September 2, 2013

science
wildlife
September 2, 2013

Castle Mountain furniture sells desks for \$346.00. If the desk cost \$216.66, what is the amount of the markup?
August 31, 2013

The Empire Carpet Company orders merchandise for \$17,700, including \$550 in shipping charges, from Mohawk Carpet Mills on May 4. Carpets valued at \$1390 will be returned because they are damaaged. The terms of sales are 2/10, n30 ROG. The shipment arrives on May 26 and Empire ...
August 25, 2013

Nature Garden Center buys lawn mowers that list for 679.95 less a 30% trade discount. What is the dollar amount of the trade discount?
August 25, 2013

History
What were the differences in kingship between France and England in the thirteenth century?
August 18, 2013

math
if there are 28 students in a class and there are 13 girls, what percentage of the class is girls?
August 14, 2013

math
a triangle has two sides with equal length and a third slide 16 meters long. if the perimeter is 42 meters what is the length of each of the equal side
July 7, 2013

Chemistry
Can you explain why?
July 2, 2013

Chemistry
The phrase “the heat absorbed or released by a system undergoing a physical or chemical change at constant pressure” is a. the change in enthalpy of the system. b. the change in internal energy of the system. c. the definition of a state function. d. the temperature ...
July 2, 2013

Chemistry
If 25.0 mLs of 0.150M nitric acid was used, how many grams of barium carbonate would be required for complete reaction?
July 2, 2013

Chemistry
Which of the following statements is incorrect concerning the thermochemical equation below? 2SO3(g)  2SO2(g) + O2(g); H° = 198 kJ a. The enthalpy of the reactants exceeds that of the products. b. The reaction is endothermic. c. For the reaction 2SO2(g) + ...
July 2, 2013

Chemistry
If 0.5000grams of barium carbonate was reacted with 25.0mLs of 0.15M nitric acid and the gas then collected in 100mL flask at 77°C, what is the gas pressure in the flask?
July 2, 2013

Chemistry
Calculate the change in enthalpy when 52.0 g of solid chromium at 25°C and 1 atm pressure is oxidized. (H°f for Cr2O3(s) is –1135 kJ/mol.) 4Cr(s) + 3O2(g)  2Cr2O3(s) a. –1135 kJ b. –284 kJ c. –568 kJ d. +1135 kJ e. +568 kJ
July 1, 2013

physics
A man is standing on a platform that is connected to a pulley arrangement, as the drawing shows. By pulling upward on the rope with a force the man can raise the platform and himself. The total mass of the man plus the platform is 94.7 kg. What pulling force should the man ...
June 30, 2013

Chemistry
Two 20.0-g ice cubes at –20.0 °C are placed into 295 g of water at 25.0 °C. Assuming no energy is transferred to or from the surroundings, calculate the final temperature of the water after all the ice melts. Heat capacity of H2O(s)=37.7J Heat capacity of H2O(l)=...
June 27, 2013

Math
Which of the following classes has the largest ratio of boys to girls?
June 27, 2013

Chemistry
What is the change in enthalpy when 4.00 mol of sulfer trixoide decomposes to sulfer dioxide and oxygen gas? 2SO2 + O2 ---> 2SO3 delta H = 198kJ
June 24, 2013

math
may 20th
June 22, 2013

Chemistry
What is the heat of combustion of ethane, C2H6, in kilojoules per mole of ethane?
June 19, 2013

Chemistry
Determine the enthalpy of the following reaction. 2M(s) + 3Cl2(g) ---> 2MCl3(s)
June 19, 2013

Chemistry
At constant volume, the heat of combustion of a particular compound is –3547.0 kJ/mol. When 1.239 g of this compound (molar mass = 196.58 g/mol) was burned in a bomb calorimeter, the temperature of the calorimeter (including its contents) rose by 8.539 °C. What is the...
June 18, 2013

Chemistry
Cr2O72-(aq) + I-(aq) -->Cr3+(aq) + IO3-(aq) What is the oxidizing species and the reducing species?
June 17, 2013

Chemistry
Using your 0.0100M oxalate solution and only the equipment and supplies listed below, describe how to prepare a 0.00025M solution of oxalate. Note, you are not allowed to add volumes with pipettes. (example, if you want 20mLs, you can not use a 10mL + 10mL addition as this ...
June 17, 2013

Chemistry
How many milliliters of 2.00 M HCl(aq) are required to react with 7.55 g of an ore containing 36.0% Zn(s) by mass?
June 16, 2013

Chemistry
Describe how to prepare a 0.0100M Solution of oxalate using solid sodium oxalate and a 500mL volumetric flask and water.
June 16, 2013

Chemistry
0.125g of sodium dichromate is to be reacted wtih 0.025M potassium iodide. How many mLs of the potassium iodide solution will be needed.
June 16, 2013

chemistry
200 ml of oxygen is collected over water at 18 degree Celsius and standard pressure, what will the volume of the dry oxygen be at STP?
June 14, 2013

Intermediate Algebra 137
Can't figure out equation x/2+x/3=3/4 can you help me step by step.
June 8, 2013

Chemistry
A 3.000gram sample of a hydrate compound containing Co, C2O4, and H2O was combusted to give 1.316g of Co3O4. What is the percentage of Cobalt in the original sample?
June 6, 2013