# emma

Most popular questions and responses by emma-
## Chemistry

What would the net ionic equation be for : HBr (aq) + KOH (aq) = KBr + H2O

*asked on October 15, 2017* -
## Language Arts

Hi! I just need someone to check my work please! :) Thanks! 1. Which of these is the defining characteristic of a comparison-and-contrast essay? A. Clear thesis statement. B. Organizational structure. C. Reliable sources. D. Similarities and differences

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

Cliﬀ divers at Acapulco jump into the sea from a cliﬀ 37.1 m high. At the level of the sea, a rock sticks out a horizontal distance of13.39 m. The acceleration of gravity is 9.8 m/s^2. With what minimum horizontal velocity must the cliﬀ divers leave

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

Hi! I just want someone to check my answers please! I cannot provide you with any pictures as I have gotten them off of my schools website. You cannot access these pictures because you have to be logged in. 1. Andrea drew triangle JKL as shown. A. The sum

*asked on February 16, 2017* -
## Language

In "All Together Now," why does Barbara Jordan most likely mention the conflict in Bosnia? A.It shows that people of different ethnic backgrounds can live in peace. B.It shows that improvements in race relations are still necessary despite past progress.

*asked on December 2, 2015* -
## Chemistry

A battery is constructed based on the oxidation of magnesium and the reduction of Cu^2+. The initial concentrations of Mg^2+ and Cu^2+ are 1.2*10^-4M and 1.5M, respectively, in 1.0-L half-cells. The initial voltage of the battery is 2.83V with the standard

*asked on May 2, 2010* -
## ENGLISH

3. What is the rhyme scheme of the following Anne Bradstreet poem? To Her Father with Some Verses Most truly honored, and as truly dear, If worth in me or ought I do appear, Who can of right better demand the same Than may your worthy self from whom it

*asked on September 4, 2012* -
## Chemistry

What volume of a 15.0% by mass NaOH solution, which has a density of 1.116 g/mL, should be used to make 4.40 L of an NaOH solution with a pH of 10.5?

*asked on March 17, 2013* -
## history

How did feudal monarchs in the High Middle Ages centralize power? need explanation

*asked on October 11, 2016* -
## Math

1. Simplify. 3x^2+ 5x-5x^2-4x+5-2 A.-8x^2-9x+3 B.2x^2+x+3 C.-2x^2-9x+3*** D.-2x^2+x+3 2. Add or Subtract.(8x – 2y) + (3x – 4y) A.11x+8y B.4x-y C.11x-6y*** D.5x+2y 3.(5x^2-4x-1)-(-4x^2-4) A.-9x^2-8x-1 B.9x^2-4x+3*** C.x^2-4x-3 D.9x^2+4x-3 4.The distance

*asked on May 5, 2016* -
## calculus

In the space below, provide the smaller of the two positive integers that add to 40 and have the largest possible product

*asked on April 22, 2015* -
## Chemistry

A chemistry student needs to standardize a fresh solution of sodium hydroxide. She carefully weighs out 338.mg of oxalic acid H2C2O4 , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in 250.mL of distilled water. The

*asked on November 7, 2018* -
## math

Mr. Smith is purchasing a $190000 house. The down payment is 20% of the price of the house. He is given the choice of: (A) a 20-year mortgage at a rate of 6%. Find: (i) The monthly payment: $ (ii) The total amount of interest paid: $

*asked on May 21, 2012* -
## Physics

On an aircraft carrier, a jet can be catapulted from 0 to 155 mi/h in 2.00 s. If the average force exerted by the catapult is 5.53×106 N what is the mass of the jet?__________ kg

*asked on October 12, 2012* -
## chemistry

what is the strongest intermolecular force in nitrogen trifluoride

*asked on March 20, 2015* -
## physics

A car sits in an entrance ramp to a freeway, waiting for a break in the traffic. The driver sees a small gap between a van and an 18-wheel truck and accelerates with constant acceleration along the ramp and onto the freeway. The car starts from rest, moves

*asked on September 29, 2013* -
## calculus

If 800 feet of fencing is used to enclose a rectangular plot of land that borders a river, what is the maximum area that can be enclosed? Answer to the nearest square foot without commas. For example, if the answer is 1,000, write 1000.

*asked on April 22, 2015* -
## math miss.sue can u plz check me answers plz

which of the following appears to be an irrational number? A. 3.7272727272... B. the root of 64 C. -6/25 D. 0.73303330...

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

A skydiver prepares to jump out of a plane. Explain how gravity and air resistance will affect the motion of the skydiver before and after he or she opens the parachute.

*asked on March 8, 2016* -
## math

you invest $4000 in an account that pays simple interest of 6% for 30 years. calculate the amount of money you'll have at the end of the indicated time period.

*asked on May 16, 2013* -
## Economics

Can someone check my answers? "Explain how unemployment affects the following groups. Give at least 3 examples for each of the groups; Laborers, Businesses, and Government" Laborers: 1) No longer has a job 2) Families can hurt from lack of money 3)Poor

*asked on November 11, 2015* -
## physics

2.) A sports car is advertised to be able to stop in a distance of 50m from a speed of 90 km/h. What is its acceleration in m/s^2? How many g's is this (g=9.80 m/s^2)

*asked on December 12, 2015* -
## Urgent math

The initial size of a culture of bacteria is 1000. After one hour the bacteria count is 4000. (a) Find a function n(t) = n0ert that models the population after t hours. n(t) = b)Find the population after 1.5 hours. (Round your answer to the nearest whole

*asked on August 3, 2015* -
## physics- please help

Question #1 A 0.140kg- baseball traveling 30.0m/s strikes the catcher's mitt, which, in bringing the ball to rest, recoils backward 14.0cm . What was the magnitude of the average force applied by the ball on the glove? question #2 How much tension must a

*asked on April 29, 2012* -
## Chem

Separate the following balanced chemical equation into its total ionic equation. AgNO3(aq)+NaCl(aq) --> NaNO3(aq)+AgCl(s) (List the ions in order of the above equation.) Write the net ionic equation for the reaction above. (Make sure the cation is

*asked on October 16, 2017* -
## Algebra 2(help please!!)

Alisha bought a collection of 500 old pennies. She chose 20 pennies from the collection and recorded their dates. Seven pennies had dates earlier than 1980. What percent of the pennies in Alisha’s collection have dates earlier than 1980? How would I

*asked on December 7, 2016* -
## science

A banana turning brown when exposed to the air is an example of

*asked on November 15, 2016* -
## Math

Which best describes best describes your ability to graph inequality

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

What did the Han emperors do to keep the economy stable A. Stopped merchants from selling goods along the Silk Road B. Brought grain, stored it, and resold it during times of low harvest C.introduced the first standardized coins D. Refused to allow

*asked on November 8, 2018* -
## Math-Probability

A law firm has six senior and fourteen junior partners. A committee of 3 partners is selected at random to represent the firm at a conference. What is the probability that at least one of the junior partners is on the committee?

*asked on March 16, 2012* -
## History

Hey! Just Want A Quick Check Over My Answers! 1. How Did The Zimmermann Note Lead The United States Closer To War? A. It Caused The United States To End Diplomatic Relations With Germany. * B. It Resulted In More U-Boat Attacks On American Ships. C. It

*asked on February 23, 2017* -
## Chemistry

The complex ion, [Ni(NH3)6]2+, has a maximum absorption near 580 nm. Calculate the crystal field splitting energy (in kJ/mol) for this ion.

*asked on December 6, 2012* -
## calculus

The area A = πr2 of a circular water ripple changes with the radius. At what rate does the area change with respect to the radius when r = 4ft?

*asked on April 13, 2015* -
## alg 1

It takes a florist 3 hour and 15 minutes to make 3 small centerpieces and 3 large centerpieces. It takes 6 hours and 20 minutes to make 4 small centerpieces and 7 large centerpieces. How long does it take to make each small centerpiece and each large

*asked on January 30, 2012* -
## Chemistry

The temperature rises from 25.00 °C to 29.00 °C in a bomb calorimeter when 3.50 g of sucrose undergoes combustion in a bomb calorimeter. Calculate ÄErxn for the combustion of sucrose in kJ/mol sucrose. The heat capacity of the calorimeter is 4.90 kJ/°C

*asked on December 6, 2012* -
## algebra

does the data in the table represent a linear function? if so, wirte a rule for the function. (below is what the table looks like) x | -2| -1| 0 | 1| 2| y | -7| 1| 8 | 17| 25| answer choices yes; y = 8x +9 yes; y = 8x + 8 no yes; y = 1/8x + 8

*asked on June 5, 2014* -
## physics help plz

One 3.5 kg paint bucket is hanging by a massless cord from another 3.5kg paint bucket, also hanging by a massless cord, as shown in the figure . Part a) If the buckets are at rest, what is the tension in lower and higher cord ? Part b)If the two buckets

*asked on May 6, 2012* -
## Trigonometry

Given that sin^2x = 4/13, what is the cos^2x? I am so lost. I need to show my work. Please help. THANK YOU!

*asked on August 30, 2017* -
## Chemistry

Thyroxine, an important hormone that controls the rate of metabolism in the body can be isolated from the thyroid gland. If 0.455 g of thyroxine is dissolved in 10.0 g of benzene, the freezing point of the solution could be measured as 5.144°C. Pure

*asked on January 21, 2013* -
## Algebra

Which is an equivalent form of the expression 1800(1.2)–t? Is 1800(1/2)^t correct?

*asked on June 28, 2014* -
## English

I have to read the book 'Nethergrave' by Gloria Skurzynski, but the online book doesn't seem to want to open on either of my computers so I assume the site is down. Does anyone know where I could find the book somewhere else online, I've been searching

*asked on December 31, 2015* -
## science

A geneticist is studying a pedigree that shows the family history of a recessive genetic disease. Which of the following pedigrees shows an impossible relationship? (

*asked on November 23, 2013* -
## physics

question : net force of 225 N accelerates a bike and rider at 2.65m/s^2. What is the mass of the bike and rider together ?

*asked on April 29, 2012* -
## Chemistry

combustion analysis of 63.8 mg of C,H, and O containing compound produced 145.0 mg of CO2 and 59.38 mg of H2O. What is the empirical formula for the compound?

*asked on December 6, 2012* -
## Chemistry

How many atoms of carbon are contained in 47.6 g of Al2(CO3)3? The molar mass of Al2(CO3)3 is 233.99 g/mol.

*asked on December 6, 2012* -
## MATH

One light flashes every 2 minutes and another light flashes every 3.5 minutes. Suppose both lights flash together at noon. What is the first time after 1 PM that both lights will flash together ?

*asked on June 26, 2012* -
## Chemistry

Which of the following is NOT true for ΔGrxn? A.) If ΔG°rxn > 0, the reaction is spontaneous in the forward direction. B.) If Q = 1, then ΔGrxn = ΔG°rxn.If ΔG°rxn = 0, the reaction is spontaneous in the reverse direction. C.) If ΔG°rxn > 0, the

*asked on November 16, 2014* -
## geometry

Campsite F And G Are On Opposite Sides Of The Lake.A Survey Crew Made Measurements Shown On The Diagram .What Is The Distance Between The Two Campsites?

*asked on August 17, 2012* -
## Psychology

9.By means of introspection, Dr. Marsh attempts to determine the components of things like perception, thinking, and consciousness. By contrast, Dr. Smyth wants to understand what the mind does in producing different kinds of behavior. We can reasonably

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

Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.140 M HClO(aq) with 0.140 M KOH(aq).HClO is a weak acid with a Ka of 4.0× 10–8. It reacts with strong base to produce ClO–. (e) after addition of 60.0 mL of KOH

*asked on April 25, 2013* -
## Honors English 11

Can someone check my answer please? Q: Read and analyze "When I heard the learn'd Astronomer" by Walt Whitman. What romantic ideas does it express, and how does the structure of the poem reinforce the meaning? -When i heard the learn'd astronomer; When the

*asked on October 29, 2015* -
## PHYSICS

a locomotive pulls 10 identical freight cars. the force between the locomotive and the first car is 100,000 Newtons, and the acceleration of the train is 2m/s^2. there is no friction to consider.what is the force between the ninth and tenth cars?

*asked on July 7, 2014* -
## algebra

what is 2n>14 What is n/5>11 - what is -3y

*asked on September 29, 2016* -
## AP Language & composition

What two pieces of information are necessary each time you cite a source in the text of your paper?

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

The radius of the Earth is approximately 3,960 miles. Find the approximate surface-area-to-volume ratio of the Earth. A. 0.00025 B. 0.00076 C. 1,320 D. 11,880

*asked on July 10, 2013* -
## physics- please help !

A box weighing 65.0 N rests on a table. A rope tied to the box runs vertically upward over a pulley and a weight is hung from the other end. Part a) Determine the force that the table exerts on the box if the weight hanging on the other side of the pulley

*asked on May 6, 2012* -
## Algebra 2(help please!!)

1. Tony decides to use observation. He visits 10 students and observes them doing schoolwork at home for 30 min. If a student looks at social media during that time, he notes it. (a) Provide an advantage of using observation. (b) Provide a disadvantage of

*asked on December 7, 2016* -
## chemistry

Liquid hexane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 3.45 g of hexane is mixed with 16.3 g of oxygen. Calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction. Be

*asked on December 6, 2011* -
## Pre-Algebra A

A company reports $23,765 in income and $18,945 in expenses for February. What was the amount of profit or loss for the month? A. $4,820 profit B. $4,820 loss C. $5,220 profit

*asked on February 13, 2019* -
## History

1.Which answer best describes a reason why industries flourished in New England? A- The people in New England had more work experience. B- New England had more lakes to use for water in factories. C- The soil was better than in the South so they could grow

*asked on April 28, 2015* -
## History

Which explains why the Compromise of 1850 intensified the argument about slavery? A- People for and against slavery migrated to Western stats to influence laws. B~Free states in the West added more antislavery votes to Congress. C~The equal division of

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

The height of a cylinder with a fixed radius of 4 cm is increasing at the rate of 2 cm/min. Find the rate of change of the volume of the cylinder (with respect to time) when the height is 14cm.

*asked on April 13, 2015* -
## Geography

What was the result of the development of the Silk Road

*asked on November 8, 2018* -
## biology

If an atom of sulfur (atomic number 16) were allowed to react with atoms of hydrogen (atomic number 1), which of the molecules below would be formed? a.S-H b.H-S-H c.H-S-H | H d.H | H-S-H | H e.H=S=H

*asked on December 11, 2008* -
## history

what was the napoleonic code?

*asked on October 18, 2010* -
## Chemistry

Two fixed charges, -4μC and -5μC, are separated by a certain distance. If the charges are separated by 20cm, what is the magnitude of the electric field halfway between the charges? My textbook says that the formula for electric field is (kq)/r^2. But

*asked on February 9, 2016* -
## PHYSICS

a 2.00kg object A is connected with a massless string across a massless, frictionless pulley to a 3.00kg object B. the smaller object rests on an inclined plane which is tilted at an angle of theta=40degrees. what are the acceleration of the system and the

*asked on July 8, 2014* -
## unscrambling word

Can you help me unscramble these words please! radmordey conshorier trinabac mecal minglem bobing lukarak its in spanish- srecmoro, and tsmnoamo- help please england antelope is the answer tyler! lafrpty=flytrap lafrpty=flytrap please help me to unscramble

*asked on June 14, 2005* -
## algebra

Match the inequality to its graph. A. less than or equal to -1 B. less than 3 C. less than 1 D. less than or equal to -3 7. 4y + 3 *less than or equal to* y+6 8. -2y > 2 9. y over 3 < -1 10. 3y *less than or equal to* 2y +

*asked on September 30, 2016* -
## Science

1.Infrared radiation has wavelengths ranging from about 800 nm to 1 mm. What is the frequency of radiation of wavelength 970 nm? Answer in units of s−1 . 2.Microwaves, such as those used for radar and to heat food in a microwave oven, have wavelengths

*asked on February 12, 2015* -
## physics

A shot-putter throws the shot ( mass = 7.3 kg) with an initial speed of 15.0 m/s at a 33.0 degreCalculate the horizontal distance traveled by the shot if it leaves the athlete's hand at a height of 1.90 m above the ground.e angle to the horizontal.

*asked on October 12, 2011* -
## physics

A large boulder is ejected vertically upward from a volcano with an initial speed of 39.0m/s . Air resistance may be ignored. (a) At what time after being ejected is the boulder moving at a speed 19.0m/s upward? (b) At what time is it moving at a speed

*asked on September 29, 2013* -
## calculus

A firework is launched at the rate of 10 feet per second from a point on the ground 50 feet from an observer. To 2 decimal places in radians per second, find the rate of change of the angle of elevation when the firework is 40 feet above the ground. Type

*asked on April 20, 2015* -
## Chemistry

Calculate the molar enthalpy for the following reaction. HCl(aq) + NH3 (aq) --> NH4Cl (aq). HCl = 50 ml (2.00M) NH3 = 50 ml (2.05 M) Delta T = 9.28 degrees Celsius. Ccal = 28.9J/g degrees celcius.

*asked on November 12, 2012* -
## Geometry

Three interior angles of a convex heptagon measure 125 degrees, and two of the interior angles measure 143 degrees. Which are possible measures for the other two interior angles of the heptagon? 1: 48 and 48 degrees 2: 39 and 100 degrees 3: 100 and 116

*asked on January 7, 2016* -
## environment

Oil spills and leaks in the Pacific Ocean have harmed marine organisms and the environment. Which kind of environmental issue is illustrated by this example?

*asked on May 7, 2014* -
## Physics (again, sorry)

A swimmer maintains a speed of 0.15 m/s relative to the water when swimming directly toward the opposite shore of a straight river with a current that flows at 0.75 m/s. (a) How far downstream is the swimmer carried in 1.5 minutes? (b) What is the velocity

*asked on November 29, 2007* -
## Algebra

Simplify the rational expression. State any restrictions on the variable. t^2+4t-12/t^2-4

*asked on March 7, 2019* -
## PHYSICS

a ball is dropped from rest at 25m above the ground. how fast is it moving at 10 m above the ground and b) how much time does it take to reach the ground? no air resistance.

*asked on July 12, 2014* -
## chemistry

Which statement describes a chemical reaction at equilibrium? A. The forward reaction happens slightly faster than the reverse reaction. B. The reaction has stopped because all reactants have been used up. C. The forward reaction happens at the same rate

*asked on September 10, 2016* -
## algebra

I NEED HELP ! Match the inequality to its graph. A. less than or equal to -1 B. less than 3 C. less than 1 D. less than or equal to -3 7. 4y + 3 *less than or equal to* y+6 8. -2y > 2 9. y over 3 < -1 10. 3y *less than or equal to* 2y +3

*asked on September 30, 2016* -
## calculus

A 15-ft ladder rests against a vertical wall. If the top of the ladder slides down the wall at a rate of 0.33 ft/sec, how fast, in ft/sec, is the bottom of the ladder sliding away from the wall, at the instant when the bottom of the ladder is 9 ft from the

*asked on April 13, 2015* -
## Pythagorean Theorem

Paul sketches a right triangle with legs of length a and b and a hypotenuse of length h. He writes an equation that relates lengths a, b, and h. Then he writes an expression for the length of the hypotenuse. Which equation does he write? √a^2 - b^2

*asked on July 17, 2019* -
## Math

What is the combined height of 3 nickels, 2 nickles, and 1 nickle

*asked on February 25, 2015* -
## History

How were William Lloyd Garrison and the Rev. Elijah Lovejoy alike? Both lived in Boston and were Underground Railroad conductors. Both printed newspapers with antislavery messages in the North. Both used their houses as Underground Railroad stations and

*asked on April 20, 2015* -
## Psychology

5.Regarding the trichromatic theory of color vision, which statement is most accurate? A. The theory maintains that receptor cells are grouped in pairs, such as black-white. B. Specialized cells in the retina engage in a process called feature detection.

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

Suppose 0.780 of potassium iodide is dissolved in 150. mL of a 51.0mM aqueous solution of silver nitrate. Calculate the final molarity of iodide anion in the solution. You can assume the volume of the solution doesn't change when the potassium iodide is

*asked on November 7, 2018* -
## History

1. How did new England's textile industry affect both children and women? a) It allowed them to earn a living wage until the age of 25. b) It gave them opportunities not available on family farms. c) It permitted them to complete their schooling. d) It

*asked on March 24, 2015* -
## science

The iodine-131 nuclide has a half-life of 8.0 days. If you originally have a 257 g sample, after 48 days how much will you have?

*asked on May 5, 2017* -
## Math

The third term of a geometric progression of positive terms is 18 and the fifth term is 162 Find the common ration and the first term? Write an expression for the Nth term of the progression? Find the sum of the first 8 terms of the progression??

*asked on June 14, 2017* -
## College Physics

A 22.9-kg child is on a swing attached to ropes that are L = 1.33 m long. Take the zero of the gravitational potential energy to be at the position of the child when the ropes are horizontal. Part A)The child's gravitational potential energy when the child

*asked on February 20, 2011* -
## Psychology

Dr. Jones is interested in how human behavior may be genetically inherited from remote ancestors, such as chimpanzees. Her field of interest is A. chemical psychobiology. B. evolutionary psychology. C. clinical neuropsychology. D. behavioral genetics. I

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

which of the following describes the role of an anthropologist? ( 1 point ) a) a person who studies the origin and development of humans b)a person who searches for artifacts from prehistory people c) a person who excavates remains from early communities

*asked on September 24, 2019* -
## MATH

f 210 people said football was their favorite sport to watch, how many people were surveyed? Football is labeled on the circle graph as 42%.

*asked on January 25, 2019* -
## Math

If two cylinders are similar, find the scale factor of the smaller figure to the larger figure. The surface area of the smaller area is 20 pi yards squared. The surface area of the larger cylinder is 125 pi yards squared. No radius or height is given, and

*asked on March 26, 2017* -
## Chemistry

The titration of 25.0 mL of an unknown concentration H2SO4 solution requires 83.6 mL of 0.12 M LiOH solution. What is the concentration of the H2SO4 solution (in M)?

*asked on December 6, 2012* -
## History

What was the impact of the Scopes Trial on education in the United States? A. It was the first significant effort to draw interest in the separation of church and state in education. B. It promoted grassroots legal efforts to fortify the need for teaching

*asked on March 15, 2019* -
## physic

a 2.00kg object A is connected with a massless string across a massless, frictionless pulley to a 3.00kg object B. the smaller object rests on an inclined plane which is tilted at an angle of theta=40degrees. what are the acceleration of the system and the

*asked on July 7, 2014* -
## math

Assume you want to accumulate $125,000 for a long-range goal in 40 years. You have two choices. Plan A is an account with annual compounding and an APR of 5%. Plan B is an account with continuous compounding and an APR of 4.5%. How much of an investment

*asked on May 14, 2013* -
## precal

If p(t) is the profit I expect my business to earn t years after opening, use functional notation to express my expected profit after 4 years and 4 months. (Round your answer to two decimal places.)

*asked on August 31, 2018*