# Paula

Popular questions and responses by Paula-
## Algebra

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

*asked on September 14, 2014* -
## 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

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* -
## Algebra

What is the value of the first term of the sequence a n =n-1 ?

*asked on September 13, 2020* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## Music

What is the vertical line at the end of a measure called?

*asked on September 11, 2014* -
## 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* -
## math

130 square root to the nearest hundredth.

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

solve and show steps 6=x+2/3

*asked on September 13, 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* -
## 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* -
## science

When does a sedimentary rock become a metamorphic rock?

*asked on October 2, 2020* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## Math

A man has three times as many quarters as half-dollars, four times as many dimes as quarters, and two more nickels than dimes. If he has $9.25, how many of each coin has he?

*asked on February 27, 2017* -
## 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* -
## Trig

Given that cos θ = 5/13 and θ is in QIV, find the exact value of a. y b. sin θ c. sec θ d. tan θ

*asked on August 7, 2013* -
## 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

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* -
## public speaking

Medium that carries message signals from senders to receivers of communication is

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

The toy car of jess is new

*asked on July 13, 2017* -
## 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* -
## biology

identify and describe how organism could respond to an external stimulus

*asked on August 14, 2013* -
## 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* -
## 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* -
## chemistry

quarters are 91.67% mass/mass copper and 8.33% mass/mass nickel. if the average quarter weighs 5.67 grams, how many atoms of nickel are in a quarter?

*asked on April 22, 2011* -
## 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* -
## 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* -
## 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

compare write >or< for 2,854,376 to 2,845,763

*asked on August 21, 2014* -
## math

208 square root to nearest hundredth.

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

X^ -3 = 216 How do you find x?

*asked on December 18, 2013* -
## Math

True or False. The value of the square root of 16 is greater than the cube root of 29.

*asked on July 21, 2013* -
## 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

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* -
## science

water in gas form is called

*asked on January 8, 2013* -
## Maths

7y = 49w - 35 I am not sure how the working out goes

*asked on October 14, 2012* -
## statistics

A salesperson has found that the probability of making various numbers of sales per day is presented in the following table. Calculate the expected number of sales per day and the standard deviation of the number of sales. Number of sales(Probability)

*asked on April 9, 2011* -
## algebra

what is the equation of the ellipse with goci at (0,-4) and (0,4) and the sum of its focal radii being 10?

*asked on March 20, 2010* -
## 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* -
## 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* -
## Medical billing and Coding

What is defined as improper behavior or billing practices that result in financial gain? I have looked all through the text and cannot find the answer.

*asked on March 26, 2015* -
## 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* -
## 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* -
## 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* -
## Math

Are these true or false? 1. If s is negative, then the square root of s^2 is -s. 2. If r is positive, then the square root of r^2 is -r. 3. If q is negative, then the square root of q^2 is q. 4. If p is positive, then the square root of P^2 = p. If

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

draw particle diagrams that account for the fact that 2 volumes of nitric oxide gas react with 1 volume of oxygen gas to form 2 volumes of product with no leftover gas

*asked on April 5, 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

Explain why there is no number that can replace n to make the equation /n/ = -3 true.

*asked on October 7, 2012* -
## Mathamatics

find the value of r in terms of T (2r+ 3T)/2 = (2r-T)/3 please help me!

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

four times the difference or two posotive integer numbers is equal to half the sum of the numbers. If one of the numbers is 14, what is the other number? I just cant get this can anyone help me?

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

need help with the following conversion Calculate the mass in pounds of one gallon of water given that the density of water is .0 g/ml

*asked on October 4, 2011* -
## 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

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

The sum of a number and its square is 72. What is the number? I took a guess at 8, but I don't know how to put it in an equation form.

*asked on March 22, 2010* -
## math word problem

how many ways can you arrange 6 books on a shelf horizontally?

*asked on March 22, 2010* -
## Math word problem

Which would you rather be paid for 12 days - $100 per day for the 12 days or one dollar for the first day, $2.00 the second, $4.00 the third, $8.00 the fourth, etc., up to and including the 12th day?

*asked on March 21, 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* -
## algebra

what are the x-intercepts, the extent of the graph and the asymptotes for x^2/16-y^2/25 = 1

*asked on March 20, 2010* -
## science

why is Drosophila melanogaster named so?

*asked on March 4, 2010* -
## trig

cos2(120degrees) help me solve this please

*asked on January 23, 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* -
## sociology

functionalism, conflict theory, symbolic interactionism

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

Which of three theoretical perspectives best explains the fact that Americans find work roles psychologically satisfying but also find them to be stressful?

*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* -
## 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* -
## Economics

QA=96-2PA_3PB QB=30-25PA+0.32Y Given that PA=2,PB=4,Y=1000

*asked on February 19, 2020* -
## 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* -
## Math

Directions are "Order these integer decimals from least to greatest: +.125, -.1428, -0.025 (with a repeating 5), 0.2. I'm thinking that ordering from least to greatest would be: -.1428, -0.025, .125, 0.20

*asked on November 12, 2016* -
## 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* -
## 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* -
## math

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

*asked on January 15, 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* -
## Geography

A bolt of cloth containing 25yd 6in. Was cut into 6 pieces. How long was each piece?

*asked on December 1, 2015* -
## Integral calculus

The length of each leg of an isosceles right triangle is increase at the rate of 2 mm/s. How fast is the hypotenuse increasing at the moment when each leg is 10 mm?

*asked on July 25, 2015* -
## 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* -
## 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* -
## 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* -
## calculus

Find the intervals on the x-axis on which the function f(x) is increasing and those which it is decreasing, where f(x) = (x)/(x^2+1) I differentiated and got f'(x)=(x^2+1) -(x)(2x) all over (x^2+1)^2 But I don't know what to do now...

*asked on March 25, 2015*