# Paula

Most popular questions and responses by Paula-
## Lincoln College Of New En

it has been found that 85.6% of all enrolled college and university students in the U.S. are undergraduates. A random sample of 500 enrolled college students in a particular state revealed that 420 of them were undergraduates. Is there sufficient evidence

*asked on April 26, 2013* -
## Algebra

What inequality represents the verbal expression all real numbers less then 69? My answer is x

*asked on September 14, 2014* -
## Chemistry

Phosphoric acid, H3PO4(aq), is a triprotic acid, meaning that one molecule of the acid has three acidic protons. Estimate the pH, and the concentrations of all species in a 0.300 M phosphoric acid solution. kPa1: 2.16 kPa2: 7.21 kPa3:12.32 [H3PO4] = ?

*asked on March 10, 2013* -
## Chemistry

Phosphoric acid, H3PO4(aq), is a triprotic acid, meaning that one molecule of the acid has three acidic protons. Estimate the pH, and the concentrations of all species in a 0.300 M phosphoric acid solution. pKa1: 2.16 pKa2: 7.21 pKa3: 12.32 Hint: Convert

*asked on March 9, 2013* -
## science

why does a cool, distant, supergiant star such as Betelgeuse have such a high apparent magnitude? PLEASE HELPPPPP!!!!!!

*asked on March 21, 2012* -
## physics

Scientists want to place a 3300 kg satellite in orbit around Mars. They plan to have the satellite orbit a distance equal to 2.2 times the radius of Mars above the surface of the planet. Here is some information that will help solve this problem: mmars =

*asked on September 13, 2014* -
## chemistry

What is the total change in entropy when 10.0 g of ice melts at 25.0°C? DHfus = 6.01 kJ/mol The answer is 1.03 J/K but idk how to find it.

*asked on March 29, 2015* -
## Algebra

Sis the set of prime numbers that are less than 15. My answer is 2,3,5,7,11, and 13

*asked on September 16, 2014* -
## chemistry help

What mass of ammonium chloride must be added to a 0.500 L solution of 0.250 M ammonia to make a buffer with a pH of 9.26? Kb (NH3) = 1.8 × 10–5?

*asked on March 30, 2015* -
## Com 425

Which of the following statements is an example of metacommunication? 1) "Lets introduce ourselves one at a time." 2) Don't call me names!" 3) I think we should take this vote to the Board." 4) Let's agree to not discuss old issues today."

*asked on July 17, 2016* -
## chemistry

If a solution of lead iodide has [I-] = 1.1x10-4 M, what is the lead(II)ion concentration at equilibrium?

*asked on March 16, 2015* -
## statistics

a pizza shop owner wishes to find the 95% confidence interval of the true mean cost of a large plain pizza. how large should the sample be if she wishes to be accurate to within $0.15? a previous study showed that the standard deviation of the price was

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

Choose them compound inequality that represents all real numbers that are less then -3 or greater than or equal to 5.

*asked on September 17, 2014* -
## science

If Deneb and Rigel were located at alpha Centauri's distance from earth, how would they appear? PLEASEEE HELPPPPPP!!!!!!!!!!

*asked on March 21, 2012* -
## STATISTICS

the percentage rates of home ownership for 8 randomly selected states are listed below. Estimate the population variance and standard deviation for the percentage rate of home ownership with 99% confidence. 66.0 75.8 70.9 73.9 63.4 68.5 73.3 65.9

*asked on April 19, 2013* -
## Lincoln College Of New En

the Old Farmer’s Almanac stated that the average consumption of water per person per day was 123 gallons. To test the hypothesis that this figure may no longer be true, a researcher randomly selected 16 people and found that they used on average 119

*asked on April 26, 2013* -
## chemistry help

If the standard calcium carbonate solution is 100 ppm and 25 mL of solution is used for the standardization, calculate the approximate volume of 2mM EDTA solution needed to reach the end point of the titration. I know to use M1V1=M2V2 but need help

*asked on March 23, 2015* -
## Calculus

A rocket is fired vertically into the air at the rate of 6 miles/min. An observer on the ground is located 4 miles from the launching pad. When the rocket is 3 miles high, how fast is the angle of elevation between the rocket and the observer changing?

*asked on November 2, 2014* -
## Lincoln College Of New En

the average 1-ounce chocolate chip cookie contains 110 calories. A random sample of 15 different brands of 1-ounce chocolate chip cookies results in the following calorie amounts, at the a = 0.01 level, is there sufficient evidence that the average

*asked on April 26, 2013* -
## chemistry

What is the total change in entropy when 10.0 g of ice melts at 25.0°C? DHfus = 6.01 kJ/mol The answer is 1.03 J/K but idk how to find it.

*asked on March 28, 2015* -
## STATISTICS

A random sample of stock prices per share (in dollars) is shown. Find the 90% confidence interval for the variance and standard deviation for the prices. Assume the variable is normally distributed.

*asked on April 19, 2013* -
## chemistry

Hydroxyapatite is the main mineral component of bone. How many grams of hydroxyapatite will dissolve in 1.00 L of H2O? Ksp = 2.34 × 10–59; Molar mass = 502.3 g/mol? I keep getting 5.83x10^-18 g but the answer is supposed to be 4.35x10^-5 g. I don't

*asked on March 29, 2015* -
## Chemistry

In a 1.0× 10–4 M solution of HClO(aq), identify the relative molar amounts of these species. (most to least) H2O HClO H3O OH- OCl-

*asked on March 9, 2013* -
## physics

A single mass (m1 = 3.1 kg) hangs from a spring in a motionless elevator. The spring constant is k = 338 N/m. 1. What is the distance the spring is stretched from its unstretched length? 2. Now, three masses (m1 = 3.1 kg, m2 = 9.3 kg and m3 = 6.2) hang

*asked on October 13, 2018* -
## chemistry

Calculate the pH of a buffer which contains 0.0500 M pyruvic acid and 0.0450 M sodium pyruvate. (The Ka of pyruvic acid is 4.1 × 10–3)

*asked on March 27, 2015* -
## STATISTICS

the percentage rates of home ownership for 8 randomdomly selected states are listed below. Estimate the population variance and standard deviation for the percentage rate of home ownership with 99% confidence. 66.0 75.8 70.9 73.9 63.4 68.5 73.3 65.9

*asked on April 17, 2013* -
## Earth Science

A contour (topographic) map indicates that a stream is flowing across a landscape. If the stream has a constant volume, where on the map would the stream most likely have the highest velocity? a. As the stream moves across several closely spaced contour

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

What mass of ammonium chloride must be added to a 0.500 L solution of 0.250 M ammonia to make a buffer with a pH of 9.26? Kb (NH3) = 1.8 × 10–5?

*asked on March 28, 2015* -
## Lincoln College Of New En

A survey by Men’s Health magazine stated that 14% of men said they used exercise to reduce stress. Use a = 0.10. a random sample of 100 men was selected and 10 said that they used exercise to relieve stress. Use the P –value method to test the claim.

*asked on April 26, 2013* -
## Physics 212

Three equal point charges, each with charge 1.50\mu C , are placed at the vertices of an equilateral triangle whose sides are of length 0.300m . What is the electric potential energy U of the system? (Take as zero the potential energy of the three charges

*asked on February 14, 2013* -
## algebra

A rock is thrown upward with a velocity of 15 meters per second from the top of a 26 meter high cliff ad i misses the cliff on the way back down. when will the rock be 5 meters from the water below?

*asked on February 15, 2013* -
## Math

The first question is show how to make one addend the next tens numbers. Complete the new addition sentence: 15 + 37= I need a break down to how to to figure this out. Please.. I have no clue what to do.

*asked on October 24, 2016* -
## chemistry

Suppose that the reaction of Fe3+ and SCN- produces Fe(SCN)2 (+). 5.00mL of 2.0mM Fe3+ is mixed with 5.00 mL of 2.0mM SCN-. The student finds the equilibrium concentrations of Fe(SCN)2(+) to be 0.3mM. 1.) What is the initial number of moles of each species

*asked on February 23, 2015* -
## chem

Calculate the mass in grams of carbon needed to produce 160 g of CO2 in burning: C + O2 --> CO2

*asked on July 15, 2013* -
## math word problem

There are 10 women and 8 men in a club. How many different committees of 6 people can be selected from the group if equal numbers of men and women are to be on the committee? I think it would be 2, because half of 6 is 3, so 3 are men and 3 are women. 2

*asked on March 21, 2010* -
## COM425

Abdoulaye tells his teammate Rick that he prefers to be called “Abdoulaye”; yet Rick continues to call him “Abdou.” This is a violation of __________ rules. 1) communication 2) relational 3) interpersonal 4) corporate (I think its relational, not

*asked on July 17, 2016* -
## 3D Modling

What are the preset views in Blender Software?

*asked on August 31, 2014* -
## sociology

How do the themes about male roles appear in the television and movies that we watch? What messages do these themes provide for men and women about masculinity and femininity?

*asked on July 27, 2009* -
## chem

what is the molality of a solution of 50.0 grams of propanol in 152 mL water if the density of wate is 1.0 g/mL and the density of the solution is 0.78 g/mL

*asked on February 12, 2011* -
## algebra 1

princess leia is a very good math student. Her average math grade was a 95 on her 15 tests. If Darth Mangham decides to drop her lowest grade, write an expression to determine her new test average.

*asked on October 3, 2014* -
## Lincoln College Of New En

The percentage of physicians who are women is 27.9% in a survey of physicians employed by a large university health system, 45 of 120 randomly selected physicians were women. Is there sufficient evidence at the 0.05 level of significance to conclude that

*asked on April 26, 2013* -
## Chemistry

Name the following compounds by IUPAC system : 1. [ Cr (NH3)3 Cl3] 2. Na4[Fe (CN)6 ] 3. Fe4[Fe (CN)6]3 4. [Ag(NH3)2] OH 5. [Cr(NH2-Ch2-ch2-NH2)3]cl3

*asked on March 10, 2010* -
## chem

I am still having a little problem with my original question. However, this is what I have done so far. I am not sure what to do with the density of the solution of 0.78 g/mL. The answer I came up with is 5.47 mol/kg. I found the density of the water in

*asked on February 13, 2011* -
## Chemistry

CO(g) + 2H_2(g) CH_3OH (g) deltaH=-90.7kJ Methanol is prepared industrially from synthesis gas (CO and H_2) Would the fraction of methanol obtained at equilibrium be increased by raising the temperature? Explain. Thank you :)

*asked on March 1, 2018* -
## science

what would be the absolute magnitude and color of a main sequence star with a temperature of 25,000 kelvin? HELP!

*asked on March 21, 2012* -
## math

The figure shown the chain drive of a bicycle. How far will the bicycle move if the pedals are rotated at 180°. Assume the radius of the bicycle wheel is 13.6 inches. There's a small circle w/a radius of 1.38 in and a large circle w/ 4.33 in.

*asked on November 17, 2010* -
## chemistry help

What are the differences in measuring the molar mass using freezing point depression between studying ionic solids and molecular solids?

*asked on January 24, 2015* -
## Chemistry

Calculate Delta H for the following equation: Zn(s) + 2H+(aq) = Zn2+(aq) + H2(g)

*asked on November 28, 2014* -
## Lincoln College Of New En

26 Gasoline Mileage for Autos and Trucks – Of the top 10 cars and trucks based on gas mileage, 4 are Hondas, 3 are Toyotas, and 3 are Volkswagens. Choose one at random. Find the probability that it is Japanese, Japanses or German or not foreigh.

*asked on April 6, 2013* -
## chemistry

a 23.8 g sample of unknown metal heated at 100 degrees c is placed in 50.0 mL of water at 24 degrees c resulting in 8.5 c temperature increase. What is the specific heat of the metal

*asked on March 12, 2013* -
## Living Environment

How one type of atom (carbon)can be the basis of so many types of biomolecules?

*asked on October 8, 2012* -
## math

In triangle ABC, sin A = 0.7 and sin B = 0.3 and side a = 12. What is the value of side b?

*asked on March 22, 2010* -
## Nutrition

which of the foods is Not a common allergen? eggs, orange juice, rice, or whole wheat bread Rice is not a common allergen. Am I right? It is in some parts of Asia. But the others are more common here. So I would GUESS Rice is the correct answer. I would

*asked on April 20, 2007* -
## Chemistry

What are the moles of substances present at equilibrium at 450C if 1 mol N2 and 4 mol H2 in a 10 L vessel react according to the following equation? N2 (g) + 3H_2(g) ⇌ 2NH_3 (g) The equilibrium constant Kc is 0.153 at 450C. Thanks a lot.

*asked on March 1, 2018* -
## Physics

02. Comic-strip hero Superman meets an asteroid in outer space and hurls it at 800 m/s, as fast as a bullet. The asteroid is a thousand times more massive than Superman, yet in the comic strip, he remains stationary after releasing the asteroid. Say, his

*asked on August 25, 2014* -
## Math

if 5x + 7y = 18 and 2x - 4y = 6, what is the value of 7x + 3y? a. 7 b. 12 c. 19 d. 24 e. 31

*asked on October 5, 2013* -
## Social studies

how was the metis'list of rights different from the charter rights and freedom?

*asked on February 8, 2013* -
## chemistry

What happens when : (give balanced chemical equations only) 1. Caustic soda reacts with carbon dioxide 2.caustic soda reacts with zinc hydroxide 3.potassium reacts with oxygen 4.sodium carbonate is fused with silicon dioxide 5. when bleaching powder reacts

*asked on March 10, 2010* -
## math

Heidi has a brown pair and a gray pair of slacks; a brown blouse, a yellow blouse, and a white blouse: and a blue sweater and a white sweater. How many different outfits does she have if each outfitshe wears consists of slack, a bluse, and a sweater?

*asked on August 8, 2009* -
## Food and Nutrition

How can food spices be either an obstacle or an aid to blending into a new culutre? If you prefer to eat highly spiced or seasoned foods, you might not want to eat the foods that are popular in your new culture. I knew a Vietnamese man who lived in the

*asked on March 29, 2007* -
## Chemistry

I have one more question DrBob, I have draw a structure of this polymer CH2=CH-CH-OH ' CH3 and identify the monomer units. Would the mononer unit be this: CH2-CH-CH-O ' CH3 AND WOULD THIS POLYMERIZATION BE A CONDENSATION TYPE? Paula--I am not an organic

*asked on February 20, 2007* -
## chemistry

A sample of 10.00g of a solid unknown was dissolved in 25.00g of water. Assuming that pure water freezes at 0.0°C and the solution freezes at -5.58°C, what is the molal concentration of the solution? What is the molar mass of the solid? Show your

*asked on January 24, 2015* -
## Chemistry

A sample of oxygen gas occupies a volume of 3.84 L at 269. K. What volume will the sample occupy at 486. K?

*asked on December 6, 2014* -
## Chemistry

What mass of ammonium nitrate is require to produce 145L of N2O at 2850 torr and 42 degree celcius

*asked on September 28, 2014* -
## Music

if you add up the durations from left to right on any level of a note tree you end up with a what?

*asked on September 11, 2014* -
## Lincoln College Of New En

How man 4 letter code words can be made using the letters in the word pencil if repetitions are permitted?

*asked on April 4, 2013* -
## statistics

A mini-computer system contains two components, A and B. The system will function so long as either A or B functions. The probability that A functions is 0.95, the probability that B functions is 0.90, and the probability that both function is 0.88. What

*asked on March 5, 2011* -
## personal finance

education plays a crutical role in financial success

*asked on February 2, 2011* -
## math

julie arrived 20 minutes before the race began. she started right on time. it took her 24 minutes to finish the6-kilometer race. she stayed 10 minutes after the race to cool off; she left. if she arrived at the race at 9:10a.m., what time was it when she

*asked on March 31, 2010* -
## College chemistry

103.5 mL of hydrogen are collected over water at 22.2 degrees Celsius and 758.2 torr from reaction with 0.1356 grams of alloy. calculate the number of moles of dry hydrogen gas that were collected.

*asked on March 30, 2010* -
## math word problem

Jim is making a diagram of the solar system. If he draws Neptune, which is 2795 million miles from the sun, 10 inches from the sun on his paper, how far away (to the nearest tenth of an inch) from the sun should he draw Mars, which is 142 million miles

*asked on March 21, 2010* -
## Math

Belinda borrowed $20,500 at simple interest rate of 4.30% p.a. from her parents to start a business. At the end of 3 months, she paid them $7,100 and $6,900 at the end of 8 months. How much would she have to pay them at the end of 18 months to clear the

*asked on September 18, 2016* -
## math

Write ( 1 9 ) 3 as a product of the same factor. Then find the value

*asked on January 15, 2016* -
## finance

A quaint but well established cafe shoppe in the new hot cafe wants to build a new cafe for increased capicity it expect sales are $800,000.00 for the first 5 years, direct cost including labor and material 50% for new cafe will be totaled at $750,000.00

*asked on August 17, 2014* -
## math 9th grade

the perimeter of a rectangle is 56 inches> the width of the rectangle is three-fourth of the length. Find the length of the diagonal of the rectangle. please help me!!!

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

Lori and her friends went to a movie on the Fourth of July. identify the collective and compound nouns friends collective Fourth of July compound did i miss any? ty

*asked on June 16, 2011* -
## english

Our class had a test in Spanish this afternoon. find the nouns mark concrete or abstract class concrete test concrete spanish concrete afternoon concrete?

*asked on June 16, 2011* -
## medical terminology

what are five memory aids for the musculoskeletal system

*asked on June 26, 2010* -
## Chemistry

In a certain reaction, 300.23 grams of solid aluminum sulfide combine with unlimited aqueous silver nitrate. How many moles of aluminum sulfide react? How many moles of each product will be produced? First of all, is the reaction a double replacement or

*asked on December 7, 2009* -
## Equivalent Payments

Belinda borrowed $20,500 at simple interest rate of 4.30% p.a. from her parents to start a business. At the end of 3 months, she paid them $7,100 and $6,900 at the end of 8 months. How much would she have to pay them at the end of 18 months to clear the

*asked on September 18, 2016* -
## Physics

A steel ball of mass 8.0 kg and traveling at 3.0 m/s [E] has a head-on elastic collision with a brass ball which is at rest. After the collision, the velocity of the brass ball is 4.0 m/s [E]. Find: a)the velocity of the steel ball after the collision b)

*asked on January 13, 2016* -
## finance

Given an interest rate of 7.2 percent per year, what is the value at Year 9 of a perpetual stream of $3,950 payments that begin at Year 19

*asked on October 18, 2015* -
## Math

In above triangular prism,ab=3cm,ac=4cm,bc=5cm and cd12 cm,show that triangle ABC is a right-angled triangle

*asked on September 6, 2014* -
## Physics

David, who is 65 kg, is driving his car at a speed of 25 m/s. He sees a dog crossing the road and so he steps on the brake to avoid hitting it. His seatbelt brings his body to a stop in 0.4 s. What magnitude of force does the seatbelt exert on him?

*asked on August 25, 2014* -
## math

130 square root to the nearest hundredth.

*asked on February 24, 2014* -
## chemistry

When 30.0g of aluminum reacts with HCl, how many grams of aluminum chloride are formed? Al + HCl --> AlCl3 + H2

*asked on July 15, 2013* -
## science

water in gas form is called

*asked on January 8, 2013* -
## Physics 111-1

A wheel, starting from rest, has a constant angular acceleration of 1.8 rad/s2. In a 3.7-s interval, it turns through an angle of 52 rad. How long has the wheel been in motion at the start of this 3.7-s interval?

*asked on November 18, 2012* -
## Material Physics

Gaseous nitrogen has a density of 1.17 kg/m3 and liquid nitrogen has a density of 810 kg/m3. [The relative molecular mass of nitrogen is 28.0] What is the mean volume per nitrogen molecule in each case? What is the mean separation between nitrogen

*asked on May 24, 2011* -
## Algebra

A riverboat cruise line has a boat that can travel 76 mi downstream in the same time that it takes to travel 52 mi upstream. The speed of the current in the river is 1.5 mph. Find the speed of the boat in still water.

*asked on March 7, 2011* -
## math

It is known from experience that in a certain industry 40 percent of all labour-management disputes are over wages, 40 percent are over working conditions, and 20 percent are over fringe benefit. Also, 9 percent of the disputes over wages are resolved

*asked on March 5, 2011* -
## math

Take any number (except for 1). Square that number and then subtract one. Divide by one less than your original number. Now subtract your original number. Did you reach 1 for an answer? You should have. How does this number game work? Hint: Redo the number

*asked on November 2, 2010* -
## algebra

9x -12 = 78. I need the steps to solve.

*asked on March 2, 2011* -
## physics

Show that beta = 3 alpha Why a gas has two heat capacities?

*asked on March 10, 2010* -
## biology

After a meal rich in starch, the blood with the highest concentration of sugar would be in what blood vessel? What are the 2 blood vessels containing blood with the highest concentration of oxygen?

*asked on September 16, 2009* -
## sociology

WHy did the government of the US refused to become involved in the Rwandan genocide, but did intervence a few years later in Kosovo?

*asked on July 28, 2009* -
## Geometry

Two ships leave San Francisco at the same time. One travles 40 degrees W of N at the speed of 20 knots. The other travels 10 degrees W of south at a speed of 15 knots. How far apart are they after 11 hours?

*asked on March 3, 2008* -
## bearing

A ship is due east of a harbour. Another ship is also 3km from the harbour but on a bearing 042 degrees from it a. Find the distance between the two ships b. Find the bearing of the second ship from the first ship

*asked on May 13, 2017* -
## chemistry

a thermometer containing 9.5g of mercury has broken. If Mercury has a density of 13.6g/ml what volume spilled

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

A skier of mass 74.6 kg is pulled up a slope by a motor-driven cable. How much work is required to pull the skier 63.3 m up a 39.0◦ slope (assumed to be frictionless) at a constant speed of 2.0 m/s? The acceleration of gravity is 9.81 m/s 2 . Answer in

*asked on January 29, 2015*