# barbara

Popular questions and responses by barbara-
## Math

Make the following changes to the number 2.614. The 1 is worth one tenth as much. The 4 is worth 10 times as much The 2 is worth one tenth as much Make the 6 worth 10 times as much So I'm not sdure if my answer I'd 6.241 or .6241

*asked on December 16, 2015* -
## Chemistry

Bromine is a reddish-brown liquid. Calculate its density (g/mL) if 586g of the substance occupies 188 mL.

*asked on January 21, 2015* -
## Statistics

The closing price of Schnur Sporting Goods, Inc., common stock is uniformly distributed between $17 and 35 per share. What is the probability that the stock price will be: More than $31? Less than or equal to $23?

*asked on November 21, 2010* -
## calculus

Find the dimensions of the largest open-top storage bin with a square base and vertical sides that can be made from 108ft^2 of sheet steel. (Neglect the thickness of the steel and assume that there is no waste)

*asked on January 3, 2009* -
## 12th grade

A particle starts at x=0 and moves along the x-axis with velocity v(t)=2t+1 for time t is less than or equal to 0. Where is the particle at t=4?

*asked on January 6, 2009* -
## physics

At the local grocery store, you push a 14.0-kg shopping cart. You stop for a moment to add a bag of dog food to your cart. With a force of 12.0N, you now accelerate the cart from rest through a distance of 2.30m in 2.55s. What was the mass of the dog food?

*asked on February 20, 2015* -
## calculus

The position of two particles on the s-axis are s1= cos(t) and s2= cos(t+(symbol for pie)/4) a. what is the farthest apart the particles ever get? b. when do the particles collide?

*asked on January 3, 2009* -
## algebra

Find the distance, d,across the river. Assume that the ratio of d to 90ft is the same as the ratio of 100ft to 50ft

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

if rock A is dropped from a cliff and rock B is thrown downward off the cliff, which of the two has a greater velocity?

*asked on October 21, 2012* -
## Calculus

Find the indefinite integral (integral sign) 3te^2tdt

*asked on February 16, 2009* -
## Chemistry HELP!

a) How would a too low molarity of NaOH affect the calculated molar mass of the unknown acid? b) How would it affect the calculated Ka of the unknown acid? If mistakenly calibrated pH meter using pH6 buffer instead of pH7 buffer, all ph meter readings were

*asked on April 13, 2011* -
## math

A medical researcher wanted to determine the effect of pH (a measure of alkalinity or acidity, with pure water having a pH of 7) on the growth of a bacteria culture. The table below gives the measurements of different cultures, in thousands of bacteria,

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

Jim is beginning his research on franchise business in order to find one that meets his needs. A quick,easy way to get general information is to

*asked on June 25, 2019* -
## statistics

Assume that the mean hourly cost to operate a commercial airplane follows the normal distribution with a mean of $2,225 per hour and a standard deviation of $220. What is the operating cost for the lowest 5 percent of the airplanes?

*asked on November 21, 2010* -
## Physics

Two hockey players on ice skates push off of each other. One has a mass of 60 kilograms. The other has a mass of 80 kilograms. What is the 60-kilogram player’s momentum?

*asked on November 8, 2017* -
## Physicsl Science

A heat pump releases 103.0 kcal as it removes 54.0 kcal at the evaporator coils. how much work does this heat pump ideally accomplish? Answer should be in KJ

*asked on September 17, 2014* -
## Physicsl Science

A cart on a linear track has a uniform acceleration of 0.172 m/s^2. What is the velocity of the cart 4.00 s after it is released from rest?

*asked on September 8, 2014* -
## statistics

Of 1735 people who came into a blood bank to give blood, 373 people had high blood pressure. Estimate the probability that the next person who comes in to give blood will have high blood pressure.

*asked on February 17, 2012* -
## Chem 121

How many grams of NaOH are present in 9.0 mL of a 8.0% (m/v) NaOH solution

*asked on July 26, 2011* -
## Math

A college class with 30 sophomores, 18 juniors, and 12 seniors is divided into project groups where each group has the same number of sophomores, juniors, and seniors. What is the greatest number of groups that can be formed? How many sophomores, juniors,

*asked on December 4, 2016* -
## Chem 121

A solution is made by dissolving 0.35 mole of LiI in enough water to give a final volume of 260.0 mL. What is the molarity of the solution?

*asked on July 26, 2011* -
## algebra

Find all points on the x-axis that are 10 units from the point (7, 6). (Hint: First write the distance formula with (7, 6) as one of the points and (x, 0) as the other point.)

*asked on October 12, 2014* -
## Physical Science

Why does a glass filled with a cold beverage seem to sweat? a. saturation always results in sweat on wet object. b. the cold glass adjacent air to saturation, which is followed by condensation of water vapor. c. when cold, water molecules can move through

*asked on September 15, 2014* -
## Chemistry

2C2H6 +7O2 --> 4CO2 + 6H2O If 6 moles of O2 are used in the following reaction, how many grams of CO2 will be produced?

*asked on April 15, 2011* -
## Public Finance

Suppose the marginal social cost of television sets is $100. This is constant and equal to the average cost of television sets. The annual demand for television sets is given by the following equation: Q = 200,000 – 500P2. If television sets are sold in

*asked on September 21, 2010* -
## algebra

It costs a manufacturer $7.95 to produce sunglasses that sell for $21.99. How many pairs of sunglasses must the manufacturer sell to make a profit of $10,530? 1 pairs of sunglasses

*asked on September 10, 2014* -
## math

Alex lives 500 yards from the park.How many inches does Alex live from the park ?

*asked on April 8, 2019* -
## algebra

A triangle has a perimeter of 112 centimeters, each of the two longer sides of the triangle is three times as long as the shortest side. Find the length of each side of the triangle

*asked on December 11, 2014* -
## science

If a 0.5 L container of juice contains 15 g of sugar, what's the concentration of sugar? A. 30 g/L B. 3.33 g/L C. 45 g/L D. 7.5 g/L I think b

*asked on May 26, 2014* -
## Soc.331

Discuss current trends affecting social welfare. Do modern trends favor the solution of social issues? What are the most effective social welfare organizations today in your opinion, and why?

*asked on November 8, 2010* -
## physics

A ball is thrown straight up with enough speed so that it is in the air for several seconds. Assume the positive direction is upwards. What is its velocity 1.5s before it reaches its highest point?What is the change in its velocity, v, during this 1.5-s

*asked on February 14, 2017* -
## chemistry

How many grams of AgNo3 are required to make 25 mL of a .80M solution?

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

the price of a computer fell 20% this year, if the computer now cost $850, how much did it cost last year?

*asked on September 26, 2014* -
## calculus

1. Estimating the Temperature of a Yam Suppose you put a yam in a hot oven, maintained at a constant temperature of 200C. As the yam picks up heat from the oven, its temperature rises.16 (a) Draw a possible graph of the temperature T of the yam against

*asked on August 27, 2014* -
## Math

During a semester, a student received scores of 76, 80, 83, 71, 80, and 78 on six tests. What is the student's average score for these six tests?

*asked on August 9, 2013* -
## Chemistry HELP!

a) How would a too low molarity of NaOH affect the calculated molar mass of the unknown acid? b) How would it affect the calculated Ka of the unknown acid? If mistakenly calibrated pH meter using pH6 buffer instead of pH7 buffer, all ph meter readings were

*asked on April 13, 2011* -
## Statistics

The Gibbs Baby Food Company wishes to compare the weight gain of infants using their brand versus their competitor’s brand. A sample of 40 babies using the Gibbs products revealed a mean weight gain of 7.6 pounds in the first 3 months after birth. The

*asked on February 28, 2010* -
## algebra

A bus was purchased for $70,000, assuming the bus depreciates at a rate of $6,000 per year(straight line depreciation) for the first 10 years, write the value v of the bus as a function of the time t (measured in years) for 0 < t < 10

*asked on December 11, 2014* -
## statistics

You plan to conduct a survey to find what proportion of the workforce has two or more jobs. You decide on the 90 percent confidence level and state that the estimated proportion must be within 2 percent of the population proportion. A pilot survey reveals

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

The price of a computer fell 20% this year. If the computer now costs $550, how much did it cost last year

*asked on September 10, 2014* -
## algebra

It costs a manufacturer $7.95 to produce sunglasses that sell for $21.99. How many pairs of sunglasses must the manufacturer sell to make a profit of $10,530

*asked on September 10, 2014* -
## math

A jeweler wants to make a silver alloy to be used to make necklaces. How many ounces of a silver alloy that costs $3.50 per ounce should be mixed with one that costs $7.00 per ounce to make a new 30-ounce alloy that costs $6.30 per ounce

*asked on September 10, 2014* -
## algebra

The vendor of a coffee cart mixes coffee beans that cost $8 per pound with coffee beans that cost $4 per pound. How many pounds of each sould be used to make a 60-pound blend that sells for $5.25 per pound?

*asked on September 26, 2014* -
## algebra

a triangle has a perimeter of 126 centimeters, each of the 2 longer sides of the triangle is three times as long as the shortest side. Find the length of each side of the triangle.

*asked on September 26, 2014* -
## Chemistry-Stoichiometry

what is the limiting reactant if 0.10 moles Fe and 0.16 moles O2 react according to the reaction 4Fe +3O2 -> 2Fe2O3?

*asked on October 19, 2013* -
## Penn foster

Which of the following sentences demonstrates the correct use of capitalizing direction words? The Northeast has been hit with an unusually cold winter. Poor Alex thought he was driving West. i live just South of Scranton. Are you heading East

*asked on January 27, 2016* -
## Physics

A ball is thrown straight up at a launch velocity of 15m/s. What is the velocity when it returns to the throwers hand?

*asked on January 24, 2016* -
## math

Janice walked around two sides of a square park. The perimeter of the park is 1,200 yards. How many yards did Janice walk? Explain your answer.

*asked on April 7, 2015* -
## Physical Science

A lamp bulb is rated 100w. Why is a time factor not included in the rating?

*asked on September 9, 2014* -
## Chem 141

Write the three thermochemical equations needed to calculate the delta H for the below reaction.? 2Mg(s) + O2(g) --------> 2 MgO(s) delta H rxn = ? (Include delta H values in kJ for each reaction)

*asked on November 17, 2010* -
## Statistics

8. A sample of 65 observations is selected from one population. The sample mean is 2.67 and the sample standard deviation is .75. A sample of 50 observations is selected from a second population. The sample mean is 2.59 and the sample standard deviation is

*asked on February 28, 2010* -
## Physical Science

A heat pump releases 103.0 kcal as it removes 54.0 kcal at the evaporator coils. How much work does this heat pump ideally accomplish? The answer should be in KJ

*asked on September 18, 2014* -
## interpersonal communications

because words have human senders and receivers, they also have multiple intentions and interpretations. True or False

*asked on November 4, 2013* -
## math

A new machine that deposits cement for a road requires 13 hours to complete a one-half mile section of road. An older machine requires 15 hours to pave the same amount of road. After depositing cement for 2 hours, the new machine develops a mechanical

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

A new machine that deposits cement for a road requires 13 hours to complete a one-half mile section of road. An older machine requires 15 hours to pave the same amount of road. After depositing cement for 2 hours, the new machine develops a mechanical

*asked on September 10, 2014* -
## grammar

"there are no bruits auscultated - are bruits and auscultated nouns,pronouns etc?

*asked on July 30, 2014* -
## calculus

Each page of a book will contain 30 in squared of print, and each page must have 2 inch margins at top and bottom and 1 inch margin at each side. What is the minimum possible area of such a page.

*asked on November 1, 2011* -
## statistics

A normal population has a mean of 21 and a standard deviation of 5. Compute the z value associated with 24 What proportion of the population is between 21 and 24? What proportion of the population is less than 18?

*asked on November 21, 2010* -
## business

a. What type of information does managerial accounting provide?

*asked on December 21, 2009* -
## Math

I need help with this.The question is Fedinand has a rectangular square garden.The garden is 7 1/2 feet wide.The area of the garden is 150 square feet.What is the length of Ferdinand's garden?Write the division needed for this problem.Do not solve.

*asked on April 2, 2017* -
## Math

find the angle θ in the right triangle in the following problem. Round to the nearest degree, if necessary. cos θ = 0.8192 A = 45 H = ?

*asked on May 23, 2015* -
## calculus

This is my last question, when I usually get problems like this the volume would be there and I would be able to solve it but this question is very confusing. A spherical iron ball is coated with a layer of ice of uniform thickness. If the ice melts at the

*asked on January 3, 2009* -
## Math

A company has determined that the profit, in dollars, it can expect from the manufacture and sale of tennis racquets is given by P = −0.01x2 + 130x − 180,000. How many racquets should the company manufacture and sell to earn a profit of $174,900?

*asked on September 16, 2014* -
## Bus Stat

Statistics: Many track hurdlers believe that starting in the inside lane closest to the field has better chance of winning. closest to the field is lane 1, nxt is lane 2, et!@#$%^&il Lane 6. find the critical value x20 to test the claim that the

*asked on June 3, 2012* -
## algebra

A jeweler wants to make a silver alloy to be used to make necklaces. How many ounces of a silver alloy that costs $3.50 per ounce should be mixed with one that costs $7.00 per ounce to make a new 30-ounce alloy that costs $6.30 per ounce

*asked on September 10, 2014* -
## algebra

A triangle has a perimeter of 56 centimeters. Each of the two longer sides of the triangle is three times as long as the shortest side. Find the length of each side of the triangle

*asked on September 10, 2014* -
## Chemistry

Zn + HCl --> ZnCl2 + H2 If 18 grams of Zn are used in the following reaction, how many grams of H2 will be produced?

*asked on April 15, 2011* -
## math

A new machine that deposits cement for a road requires 13 hours to complete a one-half mile section of road. An older machine requires 15 hours to pave the same amount of road. After depositing cement for 2 hours, the new machine develops a mechanical

*asked on September 10, 2014* -
## Reading

Except for a few pigeons, Central Park was deserted. Mist hung above the chilled grass. Patches of old snow, scattered here and there, looked like white puddles. The sun hung just above the horizon, casting red and orange streaks across low-hanging clouds.

*asked on June 12, 2014* -
## Physics

A plane diving with constant speed at an angle of 52.5° with the vertical, releases a package at an altitude of 499 m. The package hits the ground 3.87 s after release. How far horizontally does the package travel?

*asked on January 27, 2015* -
## math

An investment adviser invested $14,000 in two accounts. One investment earned 4% annual simple interest, and the other investment earned 2.5% annual simple interest. The amount of interest earned for 1 year was $458. How much was invested in each account?

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

A boat was purchased for $45,000. Assuming the boat depreciates at a rate of $4700 per year (straight-line depreciation) for the first 8 years, write the value v of the boat as a function of the time t (measured in years) for 0 ¡Ü t ¡Ü 8. v(t) = ____,

*asked on October 18, 2014* -
## calculus

An oil can is to have a volume 1000in^3 and is to be shaped like a sylinder with a flat bottom but capped by a hemisphere. Neglect the thickness of the material of the can and find the dimensions that will minimize the total amount of material needed to

*asked on November 5, 2011* -
## statistics

what is the variance and standard deviation for the group of numbers: 28 27 48 52 77 29 30 31 60

*asked on March 4, 2011* -
## statistics

7. A sample of 40 observations is selected from one population. The sample mean is 102 and the sample standard deviation is 5. A sample of 50 observations is selected from a second population. The sample mean is 99 and the sample standard deviation is 6.

*asked on February 28, 2010* -
## math

Please help. the question is: Estimate the quotient. Tell what compatible numbers you used 817 divided by 4

*asked on January 15, 2009* -
## math

Mrs, jones is having a pizza party for 19 students. each pizza will be cut in 6 slices. how many pizzas will Mrs jones need to order?

*asked on November 25, 2016* -
## still confused

The length of a rectangle is 3 feet less than twice the width of the rectangle. If the perimeter of the rectangle is 144 feet, what is the length? am looking for the length, not the width. Thanks I know the width is 25

*asked on September 12, 2014* -
## Professional communications

Define and discuss the similarities and differences between routine and positive messages, negative messages, and persuasive messages.

*asked on March 16, 2009* -
## english

i need to know what are the simile's,metaphors, and personifications in A SUMMER lOVE POEM BY NIKKI GIOVANNI CLOUDS FLOAT BY ON A SUMMER SKY I HOP SCOTCH OVER YOU RAINBOWS ARCH FROM GROUND TO GOLD I CLIMB OVER YOU THUNDER GRUMBLES, LIGHTNING TUMLES AND I

*asked on November 16, 2015* -
## Math

For each person with the flu there six with only flu symptoms. How many people out of forty would be expected to have only flu symptoms?

*asked on October 29, 2015* -
## -Math-Desperate

An investment adviser invested $14,000 in two accounts. One investment earned 4% annual simple interest, and the other investment earned 2.5% annual simple interest. The amount of interest earned for 1 year was $458. How much was invested in each account?

*asked on September 12, 2014* -
## math

A jeweler wants to make a silver alloy to be used to make necklaces. How many ounces of a silver alloy that costs $3.50 per ounce should be mixed with one that costs $7.00 per ounce to make a new 30-ounce alloy that costs $6.30 per ounce?

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

An investment adviser invested $14,000 in two accounts. One investment earned 4% annual simple interest, and the other investment earned 2.5% annual simple interest. The amount of interest earned for 1 year was $458. How much was invested in each account?

*asked on September 10, 2014* -
## communication

How does language allow self reflecting, organize perceptions, allow hypothetical thought

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

Lineing up the decimals then subtracting. 9.61-0.268 . I need to know how?

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

Harry drove for 6 hours on the freeway, then decreased his speed by 20 miles per hour and drove for 6 more hours on country road. If his total trip was 624 miles, then what was his speed on freeway?

*asked on June 2, 2016* -
## Early childhood education

Consider these two sentences from Michaela: A) Age 4 years: "I miss you, Nana!" (spoken over the phone to her grandmother who had returned home after a visit). B) Age 4 years, 6 months: "I'm going to miss you, Nana" (spoken in person to her grandmother who

*asked on March 6, 2015* -
## algebra

a motorboat left a harbor and traveled to an island at an average rate of 12 knots, the average speed on the return trip was 10 knots. If the total trip took 8.8 hours, how far is the harbor from the island?

*asked on September 25, 2014* -
## college physics

a railway freightbcar whose mass is 15 000kg & speed is 2.4m/s runs into a stationary freight car whose mass is 25 000kg. the 2 cars couple & roll off the track. what is the speed if the 2 cars as tey move together down the track? and how much kinetic

*asked on November 29, 2011* -
## psy 231

How does the understanding of development psychology helpful in these occupations? drama coach, park ranger, resturant owner and pharmaceutical manufacturer.

*asked on June 3, 2010* -
## teaching math

Indicate whether the deductive reasoning used is an example of affirming the hypothesis or denying the conclusion. If a number is divisible by 3, then the sum of the digits of that number is divisible by 3. The sum of the digits of a number is not

*asked on June 6, 2009* -
## medical

should corrections be date and time stamped and why?

*asked on March 15, 2009* -
## science

How do i calculate how much time it takes to heat water? All I know is the power supplied and the energy required. Thanks power= energy/time Power*time= energy you know the energy, you know the power, solve for time. time(in seconds)=

*asked on January 16, 2007* -
## math

WHAT IS THE LATERAL SURGACE AREA OF A RECTANGULAR PRISM WITH THE BASE PERIMETER OF 150 MM AND A HEIGHT OF 5 MM

*asked on April 21, 2016* -
## math

A salesperson earned 33,250 on annual sales of 950,000. What is her rate of commission.

*asked on April 18, 2015* -
## algebra

A bus was purchased for $80,000. Assuming the bus depreciates at a rate of $6,000 per year (straight-line depreciation) for the first 10 years, write the value v of the bus as a function of the time t (measured in years) for 0 ¡Ü t ¡Ü 10. v(t)= ____

*asked on October 18, 2014* -
## Astronomy

How can Google Earth be used to access the size of the Earth?

*asked on February 20, 2014* -
## Statistics

For each of the following samples that were given an experimental treatment, test whether these samples represent populations that are different from the general population: A. a sample of 10 with a mean of 44. B.a sample of 1 with a mean of 48. The

*asked on November 15, 2010* -
## Correction Please

The length of a rectangle is 3 feet less than twice the width of the rectangle. If the perimeter of the rectangle is 144 feet, what is the length? am looking for the length, not the width. Thanks

*asked on September 12, 2014*