# Mary

Popular questions and responses by Mary-
## 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* -
## 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

an athlete can run 6 miles in 51 minutes. at this rate, approximately how far could the runner go in 1.5 hours

*asked on March 4, 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* -
## math

a satisfaction survey is administered to 568 people. seventy- one people were unsatisfied with the product. which statement is true? a. 1 out of every 8 clients was unsatisfied b. 6 out of 8 clients were satisfied c. 1/4 pf the clients were unsatisfied d.

*asked on March 12, 2013* -
## science

the team____ won the game is my favorite a. which b. whom c.who d. that

*asked on March 11, 2013* -
## math

A box is 24 inches long, 10 inches wide, and 10 inches deep. About how many cubic feet is the box?

*asked on November 10, 2019* -
## math

which would be the approximate metric equivalent to 7 inches? a) 0.63 mm b) 1.4 m c) 12 dm d) 18 cm

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

pwsafmix copy the letter string above on a piece of paper. cross out the second and last letters. Replace all vowels with letter C. insert an O before the second C. cross out the first and third letters. double the second letter. help!

*asked on March 5, 2013* -
## ....

hans uses a wheelchair. although he has a ramp to get in his house he finds it difficult to get his wheelchair up the ramp. which modification would make it easier for hans to get in his house? a. increase the length of the ram b. increase friction between

*asked on March 18, 2013* -
## 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

a saleman, after deducting his commission of 6%, remits $2491 to his company. The gross amount of the sale amounted to.

*asked on July 16, 2014* -
## ....

p w s a f m i x copy the letters above on a piece of paper. cross out the second and last letters. replace all vowels with letters. double the second letter which letter sequence remains on your page? a. ssfmoi b.cffmmc c.sffmoc d.fscfmc

*asked on March 11, 2013* -
## 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* -
## 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* -
## 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* -
## 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* -
## math

six hundred and thirty miligrams is equal to how many grams? a) 0.063 g b) 0.63 g c)63 g d) 630,000 g

*asked on March 12, 2013* -
## 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* -
## 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 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* -
## 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* -
## math

An airline with two types of airplanes, P1 and P2, has contracted with a tour group to provide transportation for a minimum of 400 first class, 900 tourist class, and 1500 economy class passengers. For a certain trip, airplane P1 costs $10,000 to operate

*asked on July 30, 2018* -
## 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* -
## 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* -
## physics

a 2kg car moving towards the right at 4 m/s collides head on with a 8 kg car moving towards the left at 2 m/s and they stick together. After the collision, the velocity of the combined boides is

*asked on June 6, 2010* -
## math

A rectangular field is 35 m longer than it is wide. The length of the fence around the perimeter of the field is 290 m. What are the dimensions (length and width) of the fence?

*asked on January 4, 2013* -
## 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* -
## 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* -
## 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* -
## 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 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* -
## ....

in the digestive tract, mouth is to bolus as a. stomach is to chyme b. gallbladder is to insulin c. small intestine is t carbohydrates d. esophagus is to peristalsis

*asked on March 18, 2013* -
## math

A college student takes a standardized test and scores a 163. If the mean is 155 and the standard deviation is 7, what is the student’s percentile rank? (Assume a normal distribution.)

*asked on February 14, 2017* -
## 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* -
## 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* -
## 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* -
## U.S. and Global Economics

An online store that has been successfully growing on its initial angel investment and revenues wants to invest $5 million to expand the business. The bank is willing to lend the business this money at a 10 percent interest rate over an eight-year term.

*asked on November 11, 2013* -
## AP CHEMISTRY

A buffer, consisting of H2PO4− and HPO42−, helps control the pH of physiological fluids. Many carbonated soft drinks also use this buffer system. What is the pH of a soft drink in which the major buffer ingredients are 7.20 g of NaH2PO4 and 4.90 g of

*asked on March 3, 2012* -
## 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* -
## 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* -
## science

mara is preparing an experiment using three cups - one made of paper, one of plastic, and one of glass- as shown below. she plans pouring 50 ml of hot water from a pitcher into each of three cups and recording the temperatures in 5- minute intervals. what

*asked on March 6, 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* -
## 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* -
## geometry

The diameter and height of this cylinder are equal to the side length, S, of the cube in which the cylinder is inscribed. What is the expression for the cylinder's volume?

*asked on March 2, 2015* -
## science

in the digestive tract, mouth is bolus to a. stomach is to chyme b. gallbladder is to insulin c. small intestine is to carbohydrate d. esophagus is to peristalsis

*asked on March 18, 2013* -
## 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* -
## 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* -
## Geometry

1) What are the converse, inverse, and contrapositive of the statement? Which statements are true? If the figure is a rectangle with sides 2 cm and 3 cm, then it has a perimeter of 10cm. My A: the statement is not true. 2) What are the hypothesis and the

*asked on October 7, 2016* -
## 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* -
## 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* -
## s.s.

How did Augustus change the Roman Republic? How did Augustus pave the way for 200 years of peace and prosperty? Plz plz help me

*asked on April 24, 2018* -
## 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* -
## ....

what is the southernmost city listed on the map a. Richmond b.San Jose c.Detroit d.Houston

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

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* -
## 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* -
## English

The students felt fairly prepared for whatever tests their instructors might give them, after years of intense studying, however difficult the test might be. which group of words is misplacef in the sentence above? a.however difficult they might be b. the

*asked on March 5, 2013* -
## 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* -
## Physics

Which one of the following actions would make the maxima in the interference pattern from a grating move closer together? Decreasing the frequency of the laser. Increasing the frequency of the laser. Increasing the number of lines per length. Increasing

*asked on August 7, 2015* -
## 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

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* -
## Chemistry

The delta G^o for a reaction : h2 (g) + i2 (g) = 2HI(g) Is 2.6 kj/moles. In one experiment the initial pressures are P h2 = 4.26 atm, P i2 = 0.024 atm, P hi = 0.23 atm. Calculate delta G

*asked on May 9, 2017* -
## 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* -
## PHYSICS

A particle (mass = 5.0 g, charge = 40 mC) moves in a region of space where the electric field is uniform and is given by Ex = 2.5 N/C, Ey = Ez = 0. If the velocity of the particle at t = 0 is given by vy = 50 m/s, vx = vz = 0, what is the speed of the

*asked on April 29, 2015* -
## Calculus

Suppose a ball is thrown straight up into the air, and the height of the ball above the ground is given by the function h(t) = 6 + 37t – 16t2, where h is in feet and t is in seconds. At what time t does the ball stop going up and start returning to

*asked on October 17, 2014* -
## Calculus

The population of a colony of bacteria is modeled by the function p(x)=50(e^-x - e^-x^2)+10 , for 0 ≤ x, where population P is in thousands, x is in hours, and x = 0 corresponds to the moment of introduction of a certain chemical into the colony's

*asked on October 16, 2014* -
## Math

You & a friend are at Paul & Elizabeth's Restaurant for a night of fine dining. You can choose among 2 appetizers, 4main dishes, & 3 desserts. Appetizer: soup or salad Main Dish: fish, chicken, beef, vegetarian Dessert: chocolate cake, apple pie, ice cream

*asked on November 12, 2013* -
## geometry

The surface area of a rectangular prism is 190 square inches, the length is 10 inches, and the width 3 inches. Find the height. I know how to do SA but I don't understand how to find height if you have SA given. The answer is 5 in but I am not able to come

*asked on May 23, 2011* -
## Business law

Ashley sees a maintenance crew from Acme Co. beginning to resurface her driveway, a service she has not contracted for. Ashley thinks a new driveway would be good, so she doesn’t say anything. If Acme sues Ashley for the value of the resurfacing, (Points

*asked on January 26, 2014* -
## science

which structure is common to both prokaryotic and eukaryotic cells ? a. mitochondria b. cell membrane c. endoplasmic reticulum d. pladtids

*asked on March 12, 2013* -
## math

A rectangular field is 35 m longer than it is wide. The length of the fence around the perimeter of the field is 290 m. What are the dimensions (length and width) of the fence?

*asked on January 4, 2013* -
## 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* -
## 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* -
## finance

Orbital Communications has operating plants in over 100 countries. It also keeps funds for transaction purposes in many foreigh countries. Assume tha tin 2010 it held 100,000 kronas in Norway worth $35,000. The funds drew 12 percent interest, and the krona

*asked on May 26, 2011* -
## Chemistry

Calculate the change in heat for the reaction SO2 + 1/2O2 --> SO3

*asked on November 2, 2010* -
## Physics please check

Please tell me where i went wrong. During an all-night cram session, a student heats up a one-half liter (0.50 10-3 m3) glass (Pyrex) beaker of cold coffee. Initially, the temperature is 19°C, and the beaker is filled to the brim. A short time later when

*asked on April 13, 2007* -
## statistics

A manufacturer has a maximum of 240, 360, and 180 kilograms of wood, plastic and steel available. The company produces two products, A and B. Each unit of A requires 1, 3 and 2 kilograms of wood, plastic and steel respectively; each unit of B requires 3, 4

*asked on August 8, 2016* -
## physics

A cubical block of density rB and with sides of length L floats in a liquid of greater density rL. (a) What fraction of the block’s volume is above the surface of the liquid? (b) The liquid is denser than water (density rW) and does not mix with it. If

*asked on February 3, 2016* -
## 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* -
## maths

Ten blackberry plants started growing in my yard. Absent constraint, blackberries will spread by 200% a month. My yard can only sustain about 50 plants. Using the logistic growth model, a. Write a recursive formula for the number of blackberry plants in my

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

What is the oxidizing agent in the following reaction? Cl2 (g) + 2Na+ (aq) + 2Br- (aq) --> 2Na+ (aq) + 2Cl- (aq) + Br2 (l)

*asked on November 8, 2011* -
## 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* -
## 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* -
## Algebra

The prices of the systems are: $1200 for System 1, $1500 for System 2, $1600 for System 3, and $1800 for System 4. Write the information from the table as a 4 x 3 matrix B. Write a row matrix A for which the entries represent the prices for the systems. If

*asked on July 30, 2018* -
## 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* -
## chemistry

Express the composition of each of the following compounds as the mass percents of its elements...? 59) Express the composition of each of the following compounds as the mass percents of its elements. a) formaldehyde, CH2O b) glucose, C6H12O6 c) acetic

*asked on January 26, 2017* -
## Ela

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

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

a candy company has 130 pounds of cashews and 170 pounds of peanuts which they combine into different mixes the deluxe has half cashews and half peanuts and sells for $7 a pound the economy mix has one third cashews and two thirds peanuts and sells for

*asked on May 4, 2016* -
## Maty

Best Rentals charges a daily fee plus a mileage fee for renting its cars. Barney was charged $111.00 for 3 days and 300 miles, while Mary was charged $198.00 for 5 days and 600 miles. What does Best Rentals charge per day and per mile?

*asked on October 25, 2014* -
## Lit 210

I need help comparing Oedipus Rex and A Raisin in the Sun. This is my outline so far. Please help. I am stuck and could use any advice. Thank you Comparing and Contrasting Oedipus Rex and A Raisin in the Sun The Oedipus Rex was written around 430 B. C in

*asked on May 23, 2011* -
## math

a bag of marbles can be divided in equal shares among 2,3,4,5, or 6 friends. What is the least number of marbles that the bag could contain?

*asked on April 20, 2011* -
## physics

An arrow is short vertically upward with an initial speed of 25m/s. When it's exactly halfway to the top of its flight, a second arrow is launched vertically upward from the same spot. The second arrow reaches the first arrow just as the first arrow

*asked on February 18, 2011* -
## 7th grade science

blood type is an example of what type of inheritance?

*asked on December 13, 2009* -
## elementary

Think of a number. Add 7. Double the result. Subtract 8. Double the result. Add 12. Divide by 4. Subtract 6. Your answer will be the original number. Explain how this trick works.

*asked on October 31, 2009* -
## Physics - Tire Pressure

Why is the air (atmospheric) pressure of 14.7 lbs/in2 not included in the pressure gauge reading for a tire?

*asked on October 5, 2009* -
## Physics

A proton is moving parallel to a uniform electric field. The electric field accelerates the proton and increases its linear momentum to 5.0 10-23 kg m/s from 1.4 10-23 kg m/s in a time of 6.5 10-6 s. What is the magnitude of the electric field?

*asked on August 30, 2007*