# Posts by joyce

Total # Posts: 176

**physical chemistry**

a mixture of toluene and water boils at 90 degrees. calculate the vapour pressure at this temperature. Assume the atmospheric pressure to be 760 mmHg

*March 19, 2017*

**Algebra**

Hello...can you please let me know if I worked this problem correctly: 10Z2^ + 8z - 7 = 16z2^ + 48z - 12 0 = 6z2^ + 30z - 5 a = 6 b = 30 c = -5 x = 30 + or - (30 2^ -4(6)(-5) / 12 x = -30 + 31.937 / 12 = .161 x = -30 - 31.937 / 12 -5.161 Am I on the right track? Thank you

*February 20, 2017*

**Math**

A room measured 6 feet wide and 14 feet long. If they use blue and white tiles that are exactly 1 square foot, how many tiles will they need

*August 17, 2016*

**Chem**

Ah, I see. Thank you!

*May 11, 2016*

**Chem**

A beaker containing 25.0 mL of 0.360 M H2SO4 spills on the counter. How much baking soda, NaHCO3, will be needed to neutralize the acid? H2SO4 (aq) + 2 NaHCO3 (s) -> Na2SO4 (aq) + 2 H2CO3 (l) GIVEN: - I've converted 25.0 mL to 0.025 L H2SO4. - 0.360 M H2SO4 - Molar mass...

*May 11, 2016*

**Life Orientation**

describe three violation or discrimination you selected and give at least two examples of such violation you found in your research project

*April 20, 2016*

**math**

a piece of carpetis in the shape of an isosceles trapezoid with a height of 30 inches and bases 40 and 60 inches. what is the area of the carpet?

*February 24, 2016*

**Math**

I just filled my car with gas we can go 25 miles on 1 gallon of gas and you can hold 14 gallons if I travel exactly 36 miles a day how many days can I drive before I have to fill it up again

*January 28, 2016*

**math,eng,phy,chem,bio,geography,economics**

if 8.99g of scandium and 8.99g of oxygen react to give scandium oxide and a leftover of oxygen 3.65g. what percentage of scandium oxide is the oxygen

*January 17, 2016*

**math,eng,phy,chem,bio,geography,economics**

in an experiment of oxgen to hydrogen in water molecule. 9g of iron were heated in a current of hydrogen,6.5g of iron and 2.8g of water were formed using this data. determine the proportion by mass of oxygen to hydrogen in water

*January 17, 2016*

**Van de graaf question**

A moving belt in a van de graaf generator transfers charge from one point to another. If the belt is 0.1 m. wide, moves with a velocity of 10 m/s and carries a surface charge of +10^-5 C/m^2, determine the current that this generator represents.

*December 31, 2015*

**Electric field**

In a simple electric circuit 1.6 J of energy are supplied to a lamp in 0.10 s. The charge transferred through the circuit is o.20 C. The average current is?

*December 31, 2015*

**Electric field**

The acceleration of an electron in an electric field with a strength of 7.0 N/C is?

*December 31, 2015*

**Electric field**

A 9.0 V potential difference exists between two metal plates which are 1.8 x 10^-3 m. apart. The acceleration of an electron that enters the region between these plates will be?

*December 31, 2015*

**Electric field**

The potential difference between the anode and the cathode of a vacuum tube is 2.0 x 10^2 V. Free electrons originate at the cathode with negligible speed and move to the anode. The speed with which the electrons arrive at the anode is?

*December 31, 2015*

**Electric field**

when an electron is accelerated through a potential difference of 1 V, the kinetic energy at the end of the field is?

*December 31, 2015*

**physics**

At a distance of 2.0 m. from a +8.0 x 10^-6 C charge, the magnitude and direction of the electric field will be?

*December 31, 2015*

**Physics**

A 100 kg. man decides to go bungee jumping off a bridge. The bungee cord has a relaxed length of 10.0 m, and acts as a perfect spring with a stiffness constant of 80 N/m. What is the maximum distance below the bridge that he will reach? (he will fall 10.0 m. before the bungee ...

*December 30, 2015*

**Physics- Ballistic pendulum**

A simple pendulum is made from a 2 kg. block of wood suspended from a light cord of length 1 m. When the pendulum is hanging in such a way that it is stationary and vertical, a bullet is shot horizontally into the block of wood where it sticks. The bullet has a mass of 1.00 x ...

*December 30, 2015*

**Physics**

A stone mass M thrown straight up with initial velocity V reaches a height H. A second stone of mass 2M, thrown straight up with an initial velocity 2V. What will be its height?

*December 30, 2015*

**chemistry**

how long would it take a 250# block of ice to melt in a room of 68 deg F

*December 17, 2015*

**physics**

A softball having a mass of 0.25 kg is pitched at 95 km/h. By the time it reaches the plate it may have slowed 10%. neglecting gravity, estimate the average force of air resistance during a pitch. if the distance between the plate and the pitcher is about 15 m.

*October 13, 2015*

**MATH**

Please help, solution set for 7(4z-3)>59 please.?

*October 6, 2015*

**Physics**

Maria throws a ball straight up with an initial velocity of 10 m/s. What is its velocity at the highest point? What is its velocity when it returned to the elevation from where it is thrown ? What is its acceleration at the highest point? What is its acceleration just before ...

*September 19, 2015*

**UMA**

math what is the answer to this 732,178+167-542,137

*May 23, 2015*

**Life orantation**

Description of recent service delivery protests

*May 21, 2015*

**Life orientation**

Description of recent service delivery protests

*May 20, 2015*

**Language Arts**

Correct answer D B D C C 100%

*April 16, 2015*

**Inorganic chem**

Nevermind. I am an idiot.

*April 16, 2015*

**Inorganic chem**

By M x L do you mean Molarity (12.1) x Liters or moles x Liters?

*April 16, 2015*

**programming**

Peter decided to save money to buy a house. Enter this amount as well as the amount he will be able to save each month. He earns 0.8% interest per month while the amount is less than R70,000 and 0,7% interest per month if the amount is equal to or more that R70,000. The ...

*March 29, 2015*

**Math**

someone answered the question. this is what they said: When you add a volume to a powder, the powder does displace the liquid some. In this case, 0.2 ml. If the powder had no volume, normally you would add 5 ml to 500 mg to get 100 mg/ml. But the combination of the powder and ...

*March 25, 2015*

**Math**

im not sure, all I know is the answer is .2 but I have no clue as to how they got it.

*March 25, 2015*

**Math**

ceftriaxone (rocephin) is a dry powder antibiotic that must be reconstituted for use. the label states that to create a 100 mg/ml solution, 4.8 ml must be added to a 500mg vial. what is the powder volume. I am not sure what formula to use for this problem. How do I go about ...

*March 25, 2015*

**Math**

Write an inequality for the following. A swimmer dove off a 25 ft. Platform. He submerged 14 feet below the water.

*January 21, 2015*

**Math**

The length of the side QR of a triangle PQR is 14.5cm <PQR=71 <QRP=57,find the length of the side s PR and PQ

*January 15, 2015*

**Math**

Diagram of a triangle PQR when QR is 14.5 <PQR=71 <QPR=57,find the lengthr of PR and PQ

*January 15, 2015*

**Chemistry**

A sample of toluene, C7H8 has a mass of 74.5 g. How many carbon atoms does it contain? How many hydrogen atoms does it contain? My work: I get 3.41 x 10^24 for carbon atoms And 3.90 x 10^24 for hydrogen atoms. Is this correct?

*November 24, 2014*

**algebra**

1 cm to the third of aluminum weighs 2.7 grams if a sheet is 0.003 8 find the weight

*September 27, 2014*

**english**

Traditional african marriage is an advantage for men only,not women

*July 29, 2014*

**math**

Without actually computing for the roots, determine whether the dimensions of the are rational numbers. Explain

*July 6, 2014*

**Finance**

An investor is thinking about buying some shares of a company at $ 75 a share. She expects the stock to rise to $ 115 a share over the next 3 years. During that time, she also expects to receive annual dividends at $ 4 a share. Assuming that the future value and the dividends ...

*June 24, 2014*

**psychology**

The researcher's question of correlation between the cost of beer and the number of calories it contains? The researcher's question of correlation between the cost of beer and the volume of alcohol it contains?

*June 14, 2014*

**Finance**

I am borrowing $ 10,000 for 5 years at 7% . Payments are made on a monthly basis and are determined using the add- on method. 1: How much total interest will I pay on the loan if I held it for the full 5 year term ? 2 : What would my monthly payments be and 3: How much higher ...

*May 31, 2014*

**language arts**

200 years from now what will my neighborhood look like?

*May 19, 2014*

**eng/135**

Revising Messages: Conciseness Revise the following sentences, using shorter, simpler words. 9. The antiquated calculator is ineffectual for solving sophisticated problems

*January 13, 2014*

**statistics**

Age at onset of dementia was determined for a sample of adults between the ages of 60 and 75. For 15 subjects, the results were ÓX = 1008, and Ó(X-M)2 = 140.4. Use this information to answer the following:

*November 18, 2013*

**statictics**

According to classical test theory, if the observed variance of a test is 50 and the true variance is 40, what is the estimated reliability of the test? Answer a. 0.40 b. 0.50 c. 0.80 d. 0.90

*October 27, 2013*

**Math**

Which of the following is the LARGEST unit of volume? Kiloliter or Hectoliter or Dekaliter or Deciliter

*October 26, 2013*

**5th grade math**

Carleen has three quarters, four dimes,and three nickels. Spends 55cent. How much mony does she have left

*September 24, 2013*

**5th grade math**

Carleen has three quarters, four dimes,and three nickels. Spends 55cent. How much mony does she have left

*September 24, 2013*

**College Algebra**

A couple wants to rent a car for one day while on vacation. Frank's Automotive Rental wants $29 a day and $0.17 per mile, while Coups-For--Day wants $21 a day and $0.19 per mile . After how many miles wo9uld the price from Coups exceed the price to rent from Franks?

*September 14, 2013*

**business math**

you take out a loan for $20,000 simple interest loan at 4% on August 21 and in 45 days you pay off $8,000 of the loan. What is your new principal?

*August 23, 2013*

**Math**

can someone please help me with the answer to this question? What payment should be made on the invoice in the amount of $ 3,400.00 dated Aug 7 if the terms of sale are 3/15, 2/30,n/45 and the bill is paid Aug 19?

*May 21, 2013*

**Math**

I don't know the answer . That's why I'm looking for someone to help me answer my question which is : An invoice is dated Aug 29 with terms of 4/15 E.O.M. What is the discount date and the net date ?

*May 21, 2013*

**Math**

does anyone know how to find the answer to the following questions: An invoice is dated Aug 29 with terms of 4/15 E.O.M. What is the discount date and the net date ?

*May 21, 2013*

**Business Math**

An invoice is dated Aug 29 with terms of 4/15 E.O.M. What is the discount date and net date ?

*May 21, 2013*

**Pre-Algebra**

Tempurature of substance increases by 10°C in 5 minutes. Write it as a unit rate. Then convert it to degrees Fahrenheit per hour.

*May 6, 2013*

**math**

If a basketball player consistently shoots 80% from the free throw line and she takes 25 free throw shots throughout the course of a game, how many free throws can she be expected to make?

*April 27, 2013*

**Math**

If the probability of an event happening is 2/5, then the probability of the event not happening is 3/5? This is False. The answer is 1/3. Explain why the answer is 1/3

*April 25, 2013*

**Math**

What is 1/2 X 48 X 20 feet

*April 17, 2013*

**Science**

what power is expended by a weightlifter when lifting a 60kg barbell a vertical distance of 1.1m in a time interval of 2.0s

*February 9, 2013*

**physics**

A scooter with a mass of 25kg on a horizontal plane that is inclined until at an angle of 3degrees.what is the minimum coefficient of static friction for the scooter not to slide?

*February 4, 2013*

**algebra**

why can’t we simplify 3x2+4x any further. If you were to incorrectly simplify this expression into a single term, what would that single term look like? Now, pick 1 or 2 numbers to plug in for “x” in 3x2+4x and your incorrectly-simplified single term expression...

*December 18, 2012*

**math**

Corey needs 24 boards that are 47 1/2 inches long. How many feet of boards should he buy explain.

*December 10, 2012*

**Human Resources**

Can you think of any cultural problems U.S. hospitals might encounter as a result of recruiting nurses abroad?

*November 18, 2012*

**Math**

If the larger of two consecutive integers is subracted from twice the smaller integer, then the result is 21. Find the integers.

*October 9, 2012*

**composition156**

What aspect of writing an introduction do you anticipate may be a challenge for you? Why?

*August 29, 2012*

**Math**

What is the sum of the first 40 consecutive odd numbers?

*August 19, 2012*

**algebra**

At local community college, it costs $150 to enroll in a morning section of an algebra course. Suppose that the variable n stands for the number of students who enroll. Then 150n stands for the total amount of money collected for this course. How much is collected if 34 ...

*March 15, 2012*

**english 11**

DBDCD

*March 9, 2012*

**physics**

it takes 14 seconds for a runner to go from 5m/s to 19m/s? how do you calucate acceleration

*February 1, 2012*

**calculus**

f'(x)=9[1+lnx]

*October 31, 2011*

**calculus**

Find the derivative of the function. HINT [See Quick Examples on page 835.] f(x) = 9x ln x

*October 31, 2011*

**math**

Lexi and Marie had $250 altogether. After Lexi spent 2/5 of her money and Marie spent $40, they had the same amount of money left. how much money did Lexi have in the beginning ?

*October 21, 2011*

**Linear equations**

Please help me solve this problem- Find an equation for the line perpendicular to 6x+2y=-2 having the same y-intercept as -4x-3y=6

*October 8, 2011*

**biology**

explain how organisims have evolved physiologically to become suited to its environment

*September 13, 2011*

**Algebra**

John rented a van for $250 for the week plus $.20 a mile. How far can John driveifhe only wants to spend a totalof $325? Write an inequality. Solve

*July 19, 2011*

**physics**

An ideal gas is confined to a container with adjustable volume. The pressure and mole number are constant. By what factor will volume change if absolute temperature doubles

*July 14, 2011*

**college math**

The atmospheric pressure P in pounds per square inch (psi) is given by the formula below, where a is the altitude above sea level (in miles). If a city has an atmospheric pressure of 13.25 psi, what is its altitude? (Recall that 1 mi = 5,280 ft. Round your answer to the ...

*July 10, 2011*

**chemistry**

The best reason I can think of for why we believe that air is a mixture is that freezing air slowly yields different liquids at different temperatures. Liquid nitrogen has a different boiling point than liquid oxygen. They also freeze at different temperatures. If air were ...

*June 20, 2011*

**pe**

Fitness Terminology 8th Grade Physical Education What Is Fitness? * Definition: A state of health characteristics, symptoms, and behaviors enabling a person to have the highest quality of life. * In other words your overall state of health. Components of Fitness: * Aerobic/...

*June 20, 2011*

**bioethics**

what is law natural law eternal law human positive law what is conscience different kinds of conscience pls need an answer thanks

*June 20, 2011*

**chemistry**

identify and show the bond in the formation of the following; AsH3 BaO BCL3 SO2 ZnC2 CL2 K2S PH3 PLS I NEED AN ANSWER THANKS

*June 19, 2011*

**math**

a liscence plate for a car must consist of a letter followed by two numbers. Each letter mus be an R, U or N. Each number must be a 2 or 6. Repetition of digits is permitted. Use the counting principle to determine the number of points in the sample. Construct a tree diagram. ...

*June 12, 2011*

**college math**

A pea plant needs exactly one of each of the following pairs of traits: Short(s) or tall(t) plant; round(r) or wrinkled(w) seeds; yellow(y) or green(g) peas; and white(wh) or purple(p) flowers. a) how many different classifications of pea plants are possible? b) Use a tree ...

*June 10, 2011*

**college math**

cannot figure out the probability for the following: A pea plant i=must have exactly on of each of the following pairs of transis: Short(s) or tall(t); round(r) or wrinkled(w)seeds; yellow(y) or green(g)peas; and white(wh) or purple(p) flowers so A) How many different ...

*June 10, 2011*

**Managerial Accounting**

is direct labor generally cosided to be a fixed cost?

*April 5, 2011*

**math**

if an angle has 40DEGREES and 80 dgrees what is the missing number?

*April 3, 2011*

**science**

determine the correct amount of sodium hydroxide needed to react with 1.0g iron (III) chloride.

*March 23, 2011*

**Science**

thnx :)

*March 7, 2011*

**Science**

How do u make this in a lewis dot structure? C2H3Cl3

*March 7, 2011*

**College Algebra**

Carl had packed 6 crates by 8 a.m. By 11 a.m., he had packed 24 crates. Find the average rate of change in crates packed from 8 a.m. to 11 a.m.

*February 22, 2011*

**algebra**

A roof rises 1.4 feet vertically and 11.8 feet horizontally. What is the grade of the roof? The grade of the roof is _____% how do I begin to find the answer to this

*January 31, 2011*

**social studies**

paragraph#1 on the industrialization in Japan what is the Grabber?

*January 19, 2011*

**math**

10 because a square pyramid a 5 faces so 5+5=10!

*January 4, 2011*

**cost accounting**

fixed cost relating to staging a concert are 350,000. variable cost per patron are $5.00. the selling price for a tickets $25.00. The blue Saints band has sold 23,000 tickets so far. How many ticket does the Blue Saints band need to sell to achieve net income of $75,000.

*December 10, 2010*

**cost accounting**

market a new product for 2.00 a unit. fixed costs to manufacture this product are 100,000. the contribution margin is 40 percent. how many units must be sold to realize net income of 100,00 from this product?

*December 10, 2010*

**cost accounting**

it a medium-size manufacturer of bicycles. during the year a new line call "Radical" was made available to Frank customers. The break-even point for sales of Radical is 250,000 with a contrbution margin ratio of 40 percent. Assuming that the profit for the radical ...

*December 10, 2010*