# Barbara

Most 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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

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

*asked on February 16, 2009* -
## 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* -
## 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

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

*asked on April 8, 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* -
## 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* -
## 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* -
## chemistry

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

*asked on December 10, 2010* -
## 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

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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## Physical Science

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

*asked on September 9, 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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 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* -
## interpersonal communications

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

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

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

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

Jen, I will attempt to write the others out. #3)ADD: -57 + (-22) I got -79 #4)Subtract -2.3-(-8.8) I got -6.5 #7)perform indicated operation: -21 - (-9) I tried to underline ----------- -21 - (-21) I got -12 over o or undfined #8)Multiply:(4){-3/2} This

*asked on July 18, 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* -
## 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* -
## -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 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* -
## grammar

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

*asked on July 30, 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* -
## 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 155-excel

Can you describe some situations in which you would have liked to exchange information between Excel and some other applications? What are these applications, and why was such an exchange desirable? How might such exchanges make your work faster, more

*asked on May 17, 2010* -
## 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* -
## statistics

Please analyze the following data using the T-test for Unpaired data: A school district wants to determine if the girls are equal to boys in test scores. They took a random sample of 22 8th grade girls and 24 8th grade boys. The district looked at recent

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

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* -
## math

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

*asked on April 18, 2015* -
## 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

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* -
## 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* -
## math

A plane leaves Chicago headed for Los Angeles at 520 mph. One hour later, a second plane leaves Los Angeles headed for Chicago at 620 mph. If the air route from Chicago to Los Angeles is 1800 miles, how long will it take (after the first plane takes off)

*asked on September 11, 2014* -
## 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* -
## 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* -
## 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* -
## Physical Science

If one measurement is known much more precisely than the other, the fractional error is the ratio of the absolute value of the difference (|M1-M2|), and the more accurate value. What is the percentage error of student A's measurement (37.2 cm long if it is

*asked on August 25, 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* -
## Math

Tanya had $1.19 in coins none of the coins were dollars or 50-cents pieces.Josie asked Tanya for change for a dollar, but she did not have the correct chang.Which coins did Tanya have?

*asked on January 9, 2013* -
## HCR 210

Select an accreditation agency and name an area of records management that is affected by its guidelines. How does accreditation affect the practical activities of record management in hospitals?

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

Napolweon pencil has a mass of 3 grams (0.27Napoleon ) when he lifts his pencil from the desk to his paper he moves it an average of 20cm (o.20m) He then returns it to his desk moving it another 20cm How much work did he do on his pencil? w=FXD

*asked on October 24, 2009* -
## marketing

You are working in the product development department of a company that creates household products. Your team has come up with an idea for a revolutionary new cleaning product. Using the seven phases of new product development as a guide, describe how your

*asked on July 24, 2009* -
## 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* -
## Buiness

The Excel file contains a WBS for a proposal to implement a PMO. Convert the WBS into a project plan. WBS for PMO Quick Start-Up Effort and Schedule (Estimates and Actual) Tasks to be Performed Actual Hours Estimated Hours Actual (Week-wise) Plan

*asked on July 26, 2008* -
## math

help my daughter has a math problem and came to me for help, I am lost.... what is the gcf for the following trinomial? x^3-18x^2+28x I am assumming you are trying to factorise we can simply take out an x to give: x(x^2-18x+28) the quadratic will not

*asked on February 22, 2007* -
## 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* -
## common core math

22+49

*asked on October 26, 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 car rents for $45 per day plus 21 cents per mile you are on a daily budget of $66 what milage will call you to stay within your budget

*asked on January 18, 2015* -
## math

A = P + Prt; P (business)

*asked on September 10, 2014* -
## help please

Cosmetic surgery is more likely to lead to disappointment if a person is ________. A. Seeking surgery with the hope of influencing a change in oneself B. Seeking surgery with the hope of influencing a change in someone else C. Seeking surgery with the hope

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

What would 350 dollars at 5 % compounded semi annually for 40 years amount to?

*asked on January 17, 2013* -
## math for business and finance

!@#$%^& hercher borrowed $7,000 to travel to london. his loan is to be paid in 48 monthly installments of $190. at the end of 14 months, !@#$%^& decides to pay off his loan. what is the final payoff !@#$%^& will make?

*asked on January 8, 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* -
## history

What incident abroad marked the election day of the 1956 election, thereby enhancing Eisenhower's bid for a second term? A. The crisis in the Formosa Straits B. The French defeat in Indochina C. An attack on U.S. Marines in Beirut D. The resolution of the

*asked on October 3, 2012* -
## 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, etc until Lane 6. find the critical value x20 to test the claim that the

*asked on June 3, 2012*