# MARY

Popular questions and responses by MARY-
## Microeconomics

ADVANCED ANALYSIS Assume the following values for Figures 5.4a and Figures 5.4b. Q1 = 20 bags. Q2 = 15 bags. Q3 = 27 bags. The market equilibrium price is $45 per bag. The price at a is $85 per bag. The price at c is $5 per bag. The price at f is $59 per

*asked on January 19, 2013* -
## Math

350 is 70% of what number? A) 500 B) 420 C) 245 D) 280 What percent of 64 is 24? A) 267% B) 62.5% C) 40% D) 37.5% What percent of $6.50 is $2.60? A) 25% B) 40% C) 90% D) 250% 20% of 140 is what number? A) 280 B) 120 C) 28 D) 12

*asked on January 8, 2016* -
## Chemistry

1) How does the atomic radius change from left to right across a period in the periodic table? A) It tends to decrease*** B)It tends to increase C) It first increases, then decreases D) It first decreases, then increases 2) What is the charge of a cation?

*asked on October 18, 2016* -
## Chemistry/hydrolysis of ATP

Cells use the hydrolysis of ATP as a source of energy. The conversion of ATP to ADP has a standard free energy change of -30.5 kJ/mol. If all the free energy from the metabolism of glucose. C6H12O6(s)+6O2(g)¨6CO2(g)+6H2O(l) goes into the conversion of

*asked on August 28, 2008* -
## Physics

A cylinder is fitted with a piston, beneath which is a spring, as in the drawing. The cylinder is open at the top. Friction is absent. The spring constant of the spring is 4100 N/m. The piston has a negligible mass and a radius of 0.023 m. (a) When air

*asked on April 24, 2007* -
## Ela

Can you help me with the final check:Relating to Parents chapter 17

*asked on October 25, 2016* -
## physics

A chair of weight 150 lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of = 38.0 directed at an angle of 41.0 below the horizontal and the chair slides along the floor.Using Newton's laws, calculate , the

*asked on September 23, 2009* -
## American Government

Check answers? 1) What is the main difference between the formal and informal qualifications for the House of Representatives? A) Formal qualifications are outlined in the Constitution**** B) Formal qualifications do not have to be followed C) Informal

*asked on October 7, 2016* -
## International Econ.. Please Help!

Practical dicussion of trade policy is dominated by considerations of income distribution. How does trade policy affect income distribution in a country? Discuss.

*asked on July 26, 2010* -
## Physics HELP!!!!!!!!

For the normal force in Figure 5.21 to have the same magnitude at all points on the vertical track, the stunt driver must adjust the speed to be different at different points. Suppose, for example, that the track has a radius of 3.1 m and that the driver

*asked on February 21, 2007* -
## physics

a uniform beam 6.0 metre long and weighing 4kg rests on support at p and q placed left and right 1.0 metres from each end of the beam weights of mass 10 kg and 8kg are placed near p and q respectively one each end of the beam.calculate the reaction at p

*asked on February 1, 2016* -
## AP CHEMISTRY

An unknown salt is either KBr, NH4Cl, KCN, or K2CO3. If a 0.100 M solution of the salt is neutral, what is the identity of the salt?

*asked on February 16, 2012* -
## Physics

A sled is being held at rest on a slope that makes an angle (theta) with the horizontal. After the sled is released, it slides a distance (d1) down the slope and then covers the distance (d2) along the horizontal terrain before stopping. Find the

*asked on October 13, 2011* -
## prealgebra

At the same time that a 60-foot tall building casts a shadow that is 21.5 feet long, a nearby tree casts a shadow that is 18 feet long. Which measure is closest to the height of the tree?

*asked on August 15, 2012* -
## pre algebra

A flower bed is in the shape of a triangle with one side twice the length of the shortest side, and the third side is 30 feet more than the length of the shortest side. Find the dimensions if the perimeter is 138 feet

*asked on June 30, 2016* -
## Chemistry

Kc for the reaction of hydrogen and iodine to produce hydrogen iodide, H2(g)+I2(g)f 2HI(g) is 54.3 at 430C. What will the concentrations be at equilibrium if we start with 0.240M concentrations of both H2 and I2?

*asked on November 29, 2011* -
## Chemistry

1.9 mol HCl and 3.8 mol NaOH react according to the equation HCl + NaOH −→ NaCl + H2O . Calculate the amount in moles of NaCl formed. Answer in units of mol

*asked on February 9, 2012* -
## Chemistry

Check answers? 1) Why did J.J. Thomson reason that electrons must be a part of the atoms of all elements? A) Cathode rays are negatively charged particles**** B) Cathode rays can be deflected by magnets C) An electron is 2000 times lighter than a hydrogen

*asked on October 7, 2016* -
## physics emergency

m1 = 2.7 kg block slides on a frictionless horizontal surface and is connected on one side to a spring (k = 40 N/m) as shown in the figure above. The other side is connected to the block m2 = 3.6 kg that hangs vertically. The system starts from rest with

*asked on November 4, 2011* -
## Chemistry

1) The letter "p" in the symbol 4p^3 indicates the ___. A) spin of an electron B) orbital shape*** C) principal energy level D) speed of an electron 2) If the spin of one electron in an orbital is clockwise, what is the spin of the other electron in that

*asked on October 10, 2016* -
## math 4th grade

Find two numbers the exact answer is between 3x567

*asked on September 18, 2014* -
## Calculus

An airplane is flying in still air with an airspeed of 325 miles per hour. If it is climbing at an angle of 20°, find the rate at which it is gaining altitude.

*asked on September 29, 2011* -
## Physics

When jumping straight down, you can be seriously injured if you land stiff-legged. One way to avoid injury is to bend your knees upon landing to reduce the force of the impact. A 75 kg man just before contact with the ground has a speed of 7.0 m/s. (a) In

*asked on March 4, 2007* -
## LA

8. Whose attitude toward Scrooge is the most severe? (1 point) Marley's Bob Cratchit's the Ghost of Christmas Present's Mrs. Cratchit's

*asked on May 23, 2016* -
## Physics

The hammer throw is a track-and-field event in which a 7.30-kg ball (the hammer) is whirled around in a circle several times and released. It then moves upward on the familiar curved path of projectile motion and eventually returns to the ground some

*asked on October 7, 2011* -
## Chemistry help please

i need some help understanding this problem please. How many moles of O are there in 32.4g N2O5, how many oxygen and nitrogen atoms are there in the 32.4g?

*asked on March 31, 2012* -
## math - college algebra

If the rational function y = r(x) has the vertical asymptote x = 9, then as x →9+, either y → ____or _____

*asked on April 7, 2013* -
## AP Physics

A light string that is attached to a large block of mass 4m passes over a pulley with negligible rotational inertia and is wrapped around a vertical pole of radius r. The system is released from rest, and as the block descends the string unwinds and the

*asked on February 18, 2008* -
## math

Suppose you are looking to buy a $5000 face value 26-week T-bill. If you want to earn at least 1% interest, what is the most you should pay for the T-bill?

*asked on July 18, 2012* -
## chemisty

How many moles of molecules are there in 250 grams of hydrogen nitrate?

*asked on January 15, 2010* -
## Probaility

The rates of on time flights for commercial jets are continuously tracked by the US Department of Transportation. Recently, Southwest Air had the best rate of 80% of its flight time on time. A test is conducted by randomly selecting 15 southwest flights

*asked on December 5, 2006* -
## chemistry

how many grams of NaCl (molecular weight 58.5) should be used to prepare 20 liters of a solution containing 154mEq/L?

*asked on February 27, 2011* -
## Physics warming a nail

2.) Pounding a nail into wood makes the nail warmer. Consider a 5-g steel nail 6 cm long and a hammer that exerts an average force of 500 N on the nail when it is being driven into a piece of wood. The nail becomes hotter. Show that the increase in the

*asked on September 20, 2009* -
## Chemistry

What is the mass (in g) of 4.65x10^22 molecules of P4O10? ( I already calculated it and the answer is 0.1 grams of P4O10.) How many P atoms are present in this sample? Thank you!

*asked on June 25, 2011* -
## Physics

1 kg block of ice at 0 degrees celsius placed in cooler. How much heat will the ice remove as it melts to water at 0 degree celsius. I know the answer is 80kcal but don't know the math that backs up the answer-please help!

*asked on June 30, 2009* -
## SOCIAL STUDIES HELP PLEASE!!!

how did the supreme court decision in Worcester V.Georgia and the Indian removal act lead to the removal and resettlement of native Americans groups? Can anyone help me with this please?

*asked on February 16, 2018* -
## college--physics

On vacation, your 1400 kg car pulls a 560 kg trailer away from a stoplight with an acceleration of 2.20. What is the net force exerted by the car on the trailer?What force does the trailer exert on the car? What is the net force acting on the car?

*asked on September 23, 2009* -
## Chemistry-Bonding

Classify the following bonds as ionic, covalent, or neither (O, atomic number 8; F, atomic number 9; Na, atomic number 11; Cl, atomic number 17; U, atomic number 92). a.) O with F _________ b.) Ca with Cl __________ c.) Na with Na _________ d.) U with Cl

*asked on November 13, 2009* -
## Physic please help!

The electrons in the beam of a television tube have a kinetic energy of 2.10 10-15 J. Initially, the electrons move horizontally from west to east. The vertical component of the earth's magnetic field points down, toward the surface of the earth, and has a

*asked on September 29, 2007* -
## science

how is the equator similar to the prime meridian A. both the prime meridian and equator are lines that divide earth into norther and southern hemispheres B. both the prime meridian and equator are imaginary base lines from which locations of earth can be

*asked on May 14, 2014* -
## Language Arts (Check My Answers

13. Complete the sentence with the word that has the most positive connotation. She was wrong and too_____ to admit it. ￼￼￼￼￼￼￼￼￼￼￼￼bullheaded headstrong hardheaded determined**** 14. What is the preposition in this sentence? Please

*asked on June 3, 2016* -
## science

An airplane flies due north at 235 km/h relative to the air. There is a wind blowing at 65 km/h to the northeast relative to the ground. What are the plane's speed and direction relative to the ground?

*asked on September 16, 2012* -
## calculus

let f be the function f(x) = x^3 + 3x^2 - x + 2 a. the tangent to the graph of f at the point P = (-2,8) intersects the graph of f again at the point Q. Find the coordinates of point Q. b. Find the coordinates of point R, the inflection point of the graph

*asked on March 23, 2010* -
## math 5th grade

Victoria has 2 pounds of flour she uses 2/5 of flour for pizza and 3/10 of the flour for bread. Find the weight of the flour she has left. Express in decimal form. I worked on this and the answer I came up with was 19.2 lbs left?

*asked on November 19, 2015* -
## math

which is correct restatement of 32% a. thirty two b. thirty two tenths c. thirty two hundredths d. thirty two thousandths

*asked on March 6, 2013* -
## math

The total fencing around a square field is 80 yards. The field has an area of how many square yards?

*asked on April 1, 2013* -
## Physic please check

A constant magnetic field passes through a single rectangular loop whose dimensions are 0.35 m x 0.55 m. The magnetic field has a magnitude of 2.1 T and is inclined at an angle of 55° with respect to the normal to the plane of the loop. (a) If the

*asked on November 5, 2007* -
## Physics

A woman on a bridge 90.0m high sees a raft floating at a constant sped on the river below. She drops a stone from rest in an attempt to hit the raft. The stone is released when the raft has 6.00m more to travel before passing under the bridge. The stone

*asked on December 28, 2008* -
## ap chem

The allene molecule has the following Lewis structure: H2C=C=CH2. Are all four hydrogen atoms in the same plane? The allene molecule has the following Lewis structure: H2C=C=CH2. Are all four hydrogen atoms in the same plane? If not, what is the spatial

*asked on December 28, 2012* -
## chemistry

A sample of potassium hydrogen oxalate, KHC2O4, weighing 0.717 g, was dissolved in water and titrated with 18.47 mL of an NaOH solution. Calculate the molarity of the NaOH solution.

*asked on April 27, 2015* -
## english

I need to combine the following sentence by changing the Italicized group of words into a gerund or gerund phrase. Then write the complete sentence using (prepositional phrase with a gerund object) I watch for the sales. This way I save money.

*asked on April 8, 2011* -
## SS

how did Alexander Hamilton plan to pay off the national debt? by creating a population tax by printing new currency by taxing imports** by increasing exports

*asked on November 1, 2016* -
## Social Studies

1. When people talk about natural resources, they usually mean (1 point) vegetation. water. minerals. all of the above•• 2. Geothermal energy is considered a (1 point) fossil fuel. renewable resource.•• nonrenewable resource. recyclable resource.

*asked on November 30, 2015* -
## Physics

How much does it cost to operate a 23-W porch light for 24 h if electric energy costs 8¢/kWh?

*asked on February 17, 2017* -
## Physics

Particles of charge +65, +48, and −95 μC are placed in a line. The center one is L = 60cm from each of the others.Calculate the net force on the left charge due to the other two.

*asked on January 31, 2015* -
## U.S. and Global Economics

The owner of a flower shop needs a short-term loan to tide her business over until she completes the sale of some unused property. She asks the bank for a $25,000 six-month loan. The bank agrees to give her the loan, but attaches a hefty interest rate of

*asked on November 11, 2013* -
## Physic please check

A +6.00 µC charge is moving with a speed of 7.00 x 10^4 m/s parallel to a very long, straight wire. The wire is 5.00 cm from the charge and carries a current of 63.0 A in a direction opposite to that of the moving charge. Find the magnitude and direction

*asked on November 5, 2007* -
## World Regional Geography

Which of the following is true of the Antarctic Treaty System? A. It was established specifically to enforce ecological regulations. B. It bans commercial mining in Antarctica. C. It's actually the Society for the Geographic Exploration of Antarctica. D.

*asked on May 8, 2014* -
## math

angle PQR and angle TQV are vertical angles. The measure of the two angles have a sum of 100*. Write and solve an equation to find x, the measure of angle TQV.

*asked on May 16, 2016* -
## math

In the following, write an expression in terms of the given variables that represents the indicated quantity: a. The cost of having a plumber spend h hr at your house if the plumber charges $30 for coming to the house and $x per hour for labor b. The

*asked on August 18, 2012* -
## U.S. and Global Economics: Involving MATH

PLZZZ.. Help I just don't understand how to calculate this A landlord wants to acquire an additional apartment building for $250,000. The new building contains eight apartment units, which will each rent for $500 per month. The bank is willing to loan the

*asked on November 13, 2013* -
## French

Check answers? 1) Write a comparative sentence: La tortue est intelligente mais le poisson est tres intelligent. A) La tortue est moins intelligente que le poisson.*** B) La tortue est aussi intelligente que le poisson. C) La tortue est plus intelligente

*asked on October 10, 2016* -
## chemistry

How does Le Chatelier's principle explain the result you obtained when you added HCL to a suspension of Ca(OH)2 in water? Where the result was, precipiatate dissappeared and an increase in temperature resulted.

*asked on October 9, 2011* -
## Physics

On a winter day the temperature drops from -5 degree C to -15 degree C overnight. If a pan sitting outside contains 0.40kg of ice, how much heat is removed from the ice for the temperature change? (specific heat (ice) = .5kcal/kg) Is it 02.0kcal?

*asked on July 9, 2010* -
## Social Studies

1. People's occupations, their behavior, and their beliefs are a part of their (1 point) government. climate. technology. culture.•• 2. When geographers study human-environment interaction, they learn (1 point) how schools are run. how people and their

*asked on November 29, 2015* -
## physics

a 20 g ball of clay traveling east at 2.0 m/s collides with a 30 g ball of clay traveling 30m degrees south of west at 1.0 m/s. what are the speed and direction of the resulting 50 g of clay?

*asked on June 28, 2010* -
## physics

A 30.0-kg child sits on one end of a long uniform beam having a mass of 20.0 kg, and a 43.0-kg child sits on the other end. The beam balances when a fulcrum is placed below the beam a distance of 1.10 m from the 30.0-kg child. How long is the beam?

*asked on July 9, 2015* -
## U.S. Government and Politics

Describe how subjectivity and other factors affect a person's calculation of cost and benefit. Give an example of a cost-benefit analysis.

*asked on September 25, 2013* -
## Algebra

In chemistry, n molecules of an ideal gas have pressure (P), volume (V), and temperature (T) that stand in the following relation, where R is a constant. PV = nRT If you solve for n what would be a good equation? I came up with n=PV/RT Some other choices

*asked on April 26, 2011* -
## Physics HELP!!!!!!!!

When an object of mass m1 is hung on a vertical spring and set into vertical simple harmonic motion, its frequency is 12 Hz. When another object of mass m2 is hung on the spring along with m1, the frequency of the motion is 4 Hz. Find the ratio m2/m1 of

*asked on April 4, 2007* -
## math

the average annual rainfall for a town is 43.2 inches. I know the monthly rainfall has to be 3.6 inches. the difference of a given month's rainfall from the average monthly rainfall is called the deviation. what is the deviation for each month shown? may 2

*asked on January 17, 2015* -
## Physics

a system consists of four particles how many terms appear in the expression for the total gravitational potential energy of the system

*asked on October 22, 2011* -
## Math

Zoe keeps track of the miles per gallon her car gets per week. She has accumulated the following data: (1, 24), (2, 24.38), (3, 24.76), (4, 25.14) A. The common difference is 0.38 B. The common difference is 0.76 C. The common ratio is 0.99 D. The common

*asked on November 10, 2015* -
## Physics

Two cars, A and B, travel in a straight line. The distance of A from the starting point is given as a function of time by xA(t)=αt+βt^2, with α=2.60m/s and β=1.20m/s^2. The distance of B from the starting point is xB(t)=γt^2−δt^3, with γ=2.80m/s^2

*asked on September 7, 2014* -
## Physics HELP!!!!!!!!

The brass bar and the aluminum bar in the drawing are each attached to an immovable wall. At 29°C the air gap between the rods is 2 x 10^-3 m. At what temperature will the gap be closed? The length of the brass rod is 2.0m The lenght of the aluminum rod

*asked on April 14, 2007* -
## Physics

Consider three identical metal spheres, A, B, and C. Sphere A carries a charge of -8q. Sphere B carries a charge of +7q. Sphere C carries no net charge. Spheres A and B are touched together and then separated. Sphere C is then touched to sphere A and

*asked on August 28, 2007* -
## AP CHEMISTRY

If a solution of HF (Ka = 6.8*10-4) has a pH of 3.42, calculate the total concentration of hydrofluoric acid.

*asked on February 16, 2012* -
## Statistics

12.34 Screening job applicants. A company retains a psychologist to assess whether job applicants are suited for assembly-line work. The psychologist classifies applicants as one of A (well suited), B (marginal), or C (not suited). The company is concerned

*asked on May 30, 2015* -
## physics help

A 10 g bullet moving at 370 m/s strikes a ballistic pendulum of mass 2kg. The bullet emerges with a speed of 100 m/s. What height does the pendulum rise to? I don't want the answer, i just need hints!!! thnaks

*asked on November 18, 2011* -
## math

The amount of bacteria after n min if the initial amount of bacteria is q and the amount of bacteria triples every 30 sec. (Hint: The answer should contain q as well as n.)

*asked on August 18, 2012* -
## Physics

A person is making homemade ice cream. She exerts a force of magnitude 17 N on the free end of the crank handle, and this end moves in a circular path of radius 0.28 m. The force is always applied parallel to the motion of the handle. If the handle is

*asked on February 23, 2007* -
## Math

Adam drew two same size rectangles and divided them into the same number of eqal parts. He shaded 1/3 of one rectangle and 1/4 of the other rectangle. What is the least number of parts into which both rectangles could be divided?

*asked on January 24, 2013* -
## physics

At a low point in its swing, a pendulum bob with a mass of 0.2kg has a velocity of 4m/s. Ignoring air resistance, how high will the bob swing above the low point before reversing direction? Please explain and show work.

*asked on March 9, 2012* -
## Physics

The question is: A small block of ice at 0oC is subjected to 10 g of 100oC steam and melts completely. Show that the mass of the block of ice can be no more than 80 g. There were no equations in my chapter to use for this question except Q ~ change in T. I

*asked on September 23, 2009* -
## CAL-Help on dr/dt

A circular oil slick of uniform thickness is caused by a spill of 1 cubic meter of oil. The thickness of the oil is decreasing at the rate of 0.1 cm/hr as the slick spreads. (Note: 1 cm = 0.01 m.) At what rate is the radius of the slick increasing when the

*asked on December 29, 2014* -
## Physics

The drawing shows two surfaces that have the same area. A uniform magnetic field B fills the space occupied by these surfaces and is oriented parallel to the yz plane as shown. If = 17°, find the ratio xz/ xy of the magnetic fluxes that pass through the

*asked on October 11, 2007* -
## Math

Test 62,004 for divisibility by 2, 3, 5, 9, or 10. Please help!!

*asked on November 9, 2016* -
## CHEMISTRY

Nitrogen and hydrogen react to form ammonia. Consider the mixture of N2 and H2 in a closed container as illustrated below. The container contains 6 hydrogen atoms and 6 nitrogen atoms (all diatomic) Assuming the reaction goes to completion, draw a

*asked on March 3, 2010* -
## Math

How do you write 1,840 in scientific notation?

*asked on November 9, 2016* -
## Physics please check

Three moles of an ideal monatomic gas are at a temperature of 345 K. Then, 2531 J of heat are added to the gas, and 1101 J of work are done on it. What is the final temperature of the gas? delta U= 3/2nR(T final -T initial) (2531J - 1101J) =

*asked on April 15, 2007* -
## math

Carlos Martin received a statement from his bank showing a balance of $56.75 as of March 15th. His checkbook shows a balance of $87.37 as of March 20. The bank returned all cancelled checks but two. One check was for $5.00 and the other was for $13.25. How

*asked on August 10, 2010* -
## Physics - electrons/protons

If you place a free electron and a free proton in the same electric field, how do the forces acting on them compare? How do their accelerations compare? Their directions of travel? My answer: Direction of travel: The proton and electron would move towards

*asked on October 4, 2009* -
## Chemistry

Calculate the ratio of the effusion rate of oxygen gas (O2) to that of nitrogen gas (N2). Express your answer in decimal form and calculate your answer to at least four sig figs.

*asked on September 23, 2010* -
## Elementary Statistics

Heights of women have a bell-shaped distribution with a mean of 161 cm and a standard deviation of 7 cm. Using Chebyshev’s theorem, what do we know about the percentage of women with heights that are within 2 standard deviations of the mean? What are the

*asked on September 4, 2012* -
## U.S. and Global economics; involving math problems

I've been working on this problem for "hours" and I can't quite figure out how to solve it; can anyone help plzzz? I would appreciate it. :) Two college students went on spring break to Guadalajara, Mexico. One took the vacation in 2002, while the other

*asked on November 11, 2013* -
## Chem

Consider the reaction shown: 452 kcal + 4 PCl5 (s) ¨ P4 (s) + 10 Cl2(g) This reaction is ________ because the sign of ƒ¢H is ________. A) exothermic; neither positive nor negative B) endothermic; positive C) endothermic; negative D) exothermic;

*asked on November 3, 2013* -
## Finance

A new bank has vault cash of $1 million and $5 million in deposits held at its Federal Reserve District Bank. a. If the required reserves ratio is 8 percent, what dollar amount of deposits can the bank have? b. If the bank holds $65 million in deposits and

*asked on October 22, 2013* -
## math

a new physician saw 841 clients during the first year of her practice and 1,072 the second. which represents the percentage increase in client volume? a. 22% b. 27% c. 78% d. 127%

*asked on March 12, 2013* -
## Business English

Can someone please help? Identify the correct sentence. Question 24 options: A) Not far from the studio is an Italian restaurant, a gas station, and a park that has a running path. b) Not far from the studio are an Italian restaurant, a gas station, and a

*asked on August 5, 2019* -
## chemistry

Titration of 50.00 mL of 0.0521 M sodium oxalate, Na2C2O4, required 38.71 mL of a potassium permanganate solution: 5 C2O42- + 2MnO4- + 16H+ = 2Mn2+ + 10 CO2 + 8H2O Calculate the molarity of the potassium permanganate solution.

*asked on June 23, 2012*