Wednesday

January 18, 2017
Total # Posts: 1,636

**Chemistry**

I am doing a lab on Creating An Effective Airbag. We need to find out how much of the base is needed, which is NaHCO3,if we have 2.25 M of HCl, which is the acid. How much of the sample do we need? and how do we find out how much we need?

*May 29, 2013*

**calculus 12**

7. ABC has vertices A(3,2,-5), B(4,-1,7) and C(-8,3,-6). a) Determine the area of ABC. b) Determine the coordinates of point D such that ABCD is a parallelogram. c) Is the parallelogram a rectangle? Justify your answer.

*May 28, 2013*

**algebra**

The class average on a math test was 75.5 and the standard deviation was 4.2. Find the z-score for a test score of 81

*May 20, 2013*

**math**

What is 7,000 decreased by 62%

*May 18, 2013*

**math**

Sunshine Honda sold 112 cars this month. If that is 40% greater than last month, how many cars were sold last month? which ratio do I do this under? For example Portion=Rate x Base

*May 18, 2013*

**Science**

When heated solid iron3 hydroxide decomposes to produce iron 3 oxide and water vapor if 0.75L of water vapor is produced at 227 degrees celsius and 1.0 aTm. how many grams of FE(OH)3 were used?

*May 17, 2013*

**CALC**

the productivity of a person at work (on a scale of 0-10) is modeled by a cosine function: 5cos (pie/2t) +5, where t is in hours. If the person starts work at t=0, being 8:00 am, at what times is the worker the least productive? a) 12pm B) 10 am and 2pm C) 11 am and 3 pm D) 10...

*May 11, 2013*

**geometry**

Jorge put colored cards into a bag. Two of the cards were green, three were red, one was orange, two were blue, and two were purple. Jorge wants to find the probability that he will pull an orange card from the bag. What step does Jorge take to determine the number of possible...

*May 2, 2013*

**chem**

Write the orbital notation for chromium. Type your answer using the noble gas abbreviation of the configuration and only the symbols in the table below. Enter the major energy levels with their sublevels in the order in which they are filled. Enter filled orbitals in a ...

*May 2, 2013*

**calculus**

ƒ(x) = x³ - 4x + 2 ƒ'(x) = 3x² - 4

*April 29, 2013*

**science**

Al(s) + HCl(aq) AlCl3(aq) + H2(g) Zn(s) + HCl(aq) ZnCl2(aq) + H2(g) Consider the unbalanced equations above. A 0.250 g sample of a mixture of aluminum and zinc metal is reacted with an excess of hydrochloric acid. Both metals react with hydrochloric acid. The sample produces ...

*April 29, 2013*

**Life Orientation**

In 10-15 lines critically discuss 5 ways in which hiv & aids impacts on the community. Provide relevant sources to support your claim..

*April 27, 2013*

**Life orientation**

Looking for the same answer.. Lol

*April 27, 2013*

**Chemistry**

A mass of a copper oxide weighed 10.00grams. The reaction was run and the amount of just copper obtained was 8.88grams. What is the empirical formula of the compound?

*April 25, 2013*

**Math**

A rose garden is designed by joining a rectangle and a semicircle, as shown below. The rectangle is 29ft long and 17ft wide. If the gardener wants to build a fence around the garden, how many feet of fence are required? (Use the value 3.14 for pi, and do not round your answer...

*April 18, 2013*

**Grade 12 Calculus**

Determine the absolute extrema of each function on the given interval. Illustrate your results by sketching the graph of each function. a) f(x) = x^2 − 4x + 3 , 0 ≤ x ≤ 3 b) f(x) = (x − 1)^2&#...

*April 16, 2013*

**Algebra**

Find the vertex, maximum or minimum,and if the concave is up or down. Y= 3x-54x+241

*April 15, 2013*

**math**

thanks

*April 3, 2013*

**math**

hey ms sue is this like a class site because ill get off if i have to

*April 3, 2013*

**math**

The circumference of a basketball is 26 inches. What is the approximate diameter of a basketball? (Use 3.14 for .)

*April 3, 2013*

**math**

i don't know what the missing piece of the equation because i just copied and pasted the question

*April 3, 2013*

**math**

thanks for answering my question before i start critisizing

*April 3, 2013*

**math**

that waz wrong not one of the answer choices that i have here

*April 3, 2013*

**math**

Helen determined she walks about 1,800 steps per of a mile. How many steps did she take if she walked 5 miles?

*April 3, 2013*

**6th grade grammar**

Thanks Billy!

*April 3, 2013*

**6th grade grammar**

Please help I have a test tomorrow! Is there a mistake with the comparative adverb? 1. Thomas jumped highly than he ever had before. a. Change highly to higher . b . Change highly to highlier . c. Change highly to more higher . d. Make no change. 2. Andre felt gooder after he...

*April 3, 2013*

**algebra**

do you think you could help me with this quiz?

*April 2, 2013*

**Spanish - Proofreading**

THANK YOU SOOOOO MUCH!!!!!!!!!! You just saved me from failing my essay :)!!

*March 29, 2013*

**Spanish - Proofreading**

Can someone please proofread this for me? Thank you. Mi viaje al cine y el restaurante. En la tarde del sabado, mi amiga, Amelia, y yo vamos en el centro a las dos y media de la tarde. Mi amiga lleve los jeans negro y la blusa amarilla, y yo llevo el vestido verde y la bufanda...

*March 29, 2013*

**calculus**

determine the point of intersection of the tangents at the points of inflection to the curve f(x)= x^4 – 24x^2 – 2

*March 28, 2013*

**Applied Behavioral Science**

Recognizing Culture Gaps As a leader, how might a leader recognize a culture gap? What are some techniques leaders might use to influence and change cultural values when necessary?

*March 24, 2013*

**Chemistry**

How many grams of C6H12O6 must be added to 0.750 kg of water to make a 1.25 m solution?

*March 20, 2013*

**Chemistry**

How many grams of H2SO4 are needed to make a 4.50 m solution in 300 g H2O?

*March 20, 2013*

**math**

The strongest recorded earthquake in the world took place in Chile on May 22 1960. It had a magnitude of 9.5 on the Richter scale. The strongest quake actually recorded in Canada was magnitude 8.1 on August 22 1949 and occurred off the Queen Charlotte Islands. (The strongest ...

*March 19, 2013*

**adv functions**

The strongest recorded earthquake in the world took place in Chile on May 22 1960. It had a magnitude of 9.5 on the Richter scale. The strongest quake actually recorded in Canada was magnitude 8.1 on August 22 1949 and occurred off the Queen Charlotte Islands. (The strongest ...

*March 18, 2013*

**math**

how to solve this need to change to equivalent divisio with a whole number 0.4/9.16

*March 15, 2013*

**physics**

calculate the uncertainty of the coefficient of friction. avg. ì=.574

*March 13, 2013*

**physics**

a car traveling 41.6 m/s is 190 m behind a truck traveling 19.4 m/s. how long will it take the car to reach the truck?

*March 11, 2013*

**physics**

at highway speeds, a particular automobile is capable of an acceleration of about 2.6 m/s^2. at this rate, how long does it take to accelerate from 60 km/h to 110 km/h?

*March 11, 2013*

**math**

1 1/3

*March 6, 2013*

**geography**

do you think that the island of Santorini was in fact the legendary Atlantis Plato depicted? Support your view with evidence

*March 2, 2013*

**chemistry**

its -3.02

*March 1, 2013*

**Chemistry calorimeter.. please help!**

thank you!

*February 27, 2013*

**Chemistry calorimeter.. please help!**

A coffee cup calorimeter contains 100ml of .200M H2SO4 at 22.3 degrees Celsius. When 2.16g Mg is added, the temperature rises to 36.3 degrees Celsius. What is the heat of the reaction per mole Mg? Please help and show steps. Much appreciated :)

*February 27, 2013*

**Math**

Teresa had a family photo with the dimensions of 12 inches by 16 1/2 inches. What is the area of the photo in square inches? Please help!!! :(

*February 25, 2013*

**physics homework**

two tugboats pulled a disabled supertanker. each tug exerts a constant force of 1.80 x 10 degree N, one 14 degree west of north and the other 14 degree east of north, as they pull the tanker 0.75 km toward the north. what is the total work they do on the supertanker?

*February 23, 2013*

**physics homework**

You throw a 20 N rock into the air from ground level and observe that when it is 1 5.0 M high, it is traveling upward at 25.0 m/s. Use the work energy principle to find (a) the rock’s speed just as it left the ground and (b) the maximum height the rock will reach.

*February 23, 2013*

**physics**

A stone is thrown horizontally at 30.0 m/s from the top of a very tall cliff. (a) Calculate its horizontal position and vertical position at 2-s intervals for the first 10.0s. (b) Plot your positions from part (a) to scale. Then connect your points with a smooth curve to show ...

*February 17, 2013*

**english/history**

Explain how The Federalist Papers would have been more or less successful if newspapers had been printed monthly (rather than daily or weekly).

*February 15, 2013*

**Math**

Number Sense Fabio said that there are 3 times as many people on a basketball team as on a tennis team. Is he correct? Explain why or why not. Tennis--2 players Basketball--5 players Softball--10 players

*February 11, 2013*

**Finance**

You (or your parents) plan to pay $1,275.00/month for a mortgage. How much is the minimum realized income per month to the nearest penny

*February 11, 2013*

**chemistry**

If you were asked to convert 25 cg to the unit hg, which of the following would be the first fraction used in the conversion?

*February 10, 2013*

**chemistry**

Which statement is the best example of pseudoscience? Mike joined a group that studies phrenology. C.J. joined a group that studies endangered species. Katarina joined a group that studies herbal remedies. Lee joined a group that studies stars and planets

*February 10, 2013*

**math**

find the unit rate of $122 in 8 days

*February 5, 2013*

**math**

the unit of $112 in 8 days

*February 5, 2013*

**Algebra II**

Simplify the expression in exponential notation. a*a*a I thought it was a^3 but that was wrong.

*February 4, 2013*

**Math**

Select all that justify the following statement. 2 * 1/2 = 1

*February 4, 2013*

**math,probability**

I just don't understand how to start it, I need structure , I can figure out the rest, don't know how to get into a strategy.

*February 2, 2013*

**math,probability**

Hi, I don't understand a homework question, can anyone please help me? I'm bad at probability. what is the probability that when you pick two cards, you will select at least one king out of two in a deck of six standard cards? (assuming there are no jokers)

*February 2, 2013*

**Chemistry**

How do I calculate the joules to heat 17 g of water from 22 degrees C to 78 degrees C?

*January 31, 2013*

**Math**

The ratio of the maximum speed of Car A to the maximum speed of Car B is 2:3. Explain whether Car A or Car B is faster.

*January 22, 2013*

**urgent i need help within an hour!**

Ascorbic acid (vitamin C, C6H8O6) is a water-soluble vitamin. A solution containing 83.3 g of ascorbic acid dissolved in 210. g of water has a density of 1.23 g/mL at 55°C Calculate the molarity of ascorbic acid in this solution. i got 2.77 but its wrong

*January 21, 2013*

**chem**

a was incorrect

*January 19, 2013*

**chem**

Calculate the number of moles of solute present in each of the following solutions. a) 39.0 mg of an aqueous solution that is 1.00 m NaCl b)90.0 g of an aqueous solution that is 2.10% sucrose (C12H22O11) by mass.

*January 19, 2013*

**Math**

John bought some stamps. He used 3/5 of then to mail letters. He had 12 stamps left. How many stamps did he use?

*January 17, 2013*

**Percents Using Proportions**

Thank you! I will reverse my work now. This was extremely helpful for grasping a new concept.

*January 17, 2013*

**Percents Using Proportions**

Here is my (probably incorrect) work so far: 1) n/160 = 125/100 40 160x125=4000 ________ 100 | 4000 Was I suppose to divide it or not? I'm not sure. 2) 714/1295 = n/100 _________ 714/1295=102/185 185 | 10,200 102x100=10,200

*January 17, 2013*

**Percents Using Proportions**

I do not understand the wording and/or got stuck while I was working on the following two problems: The attendance at a family reunion was 160 people. This was 125% of last year's attendance. How many people attended the reunion last year? There are 1,295 students ...

*January 17, 2013*

**science-repost! please help**

Determine if the following substances are soluble (at room temperature, 1 atm) in water or in hexane (: grease and CS2 how do you know this

*January 17, 2013*

**science**

The enthalpy of solution of KBr in water is about +198 kJ/mol. Nevertheless, the solubility of KBr in water is relatively high. Why does the solution process occur even though it is endothermic

*January 17, 2013*

**chem**

Determine if the following substances are soluble (at room temperature, 1 atm) in water or in hexane (: grease and CS2 how do you know this

*January 16, 2013*

**CJ 216**

I would like to mention, really rude answers.

*January 12, 2013*

**CJ 216**

I know its confusing because they don't really tell what Uncle Bob has done. I am finding the same difficulty. This website was of no help.

*January 12, 2013*

**chem-**

Draw the structures of the two monomers that yield Nomex®. can someone show me?

*January 12, 2013*

**Pre-Algebra**

Simplify the expression. Write the result using positive exponents only. (-2x^3y^-4)(5x^-1y)

*January 10, 2013*

**chem**

760 torr is wrong

*January 10, 2013*

**chem**

A liquid that has an equilibrium vapor pressure of 129 torr at 25°C is placed into a 1-L vessel like that shown below. A few mL of the liquid is introduced into the vessel at 25°C while it has a pressure of 1.00 atm of air in it, without allowing any of the air to ...

*January 10, 2013*

**Chemistry**

convert grams to moles then use the equatino to do moles of Na to moles of H2O then convert moles of H2O to molecules by using avogadros number (6.022e23) I believe

*January 10, 2013*

**chem-answer check please**

Compounds like CCl2F2 are known as chlorofluorocarbons, or CFCs. These compounds were once widely used as refrigerants but are now being replaced by compounds that are believed to be less harmful to the environment. The heat of vaporization of CCl2F2 is 289 J/g. What mass of ...

*January 10, 2013*

**chemistry**

Compounds like CCl2F2 are known as chlorofluorocarbons, or CFCs. These compounds were once widely used as refrigerants but are now being replaced by compounds that are believed to be less harmful to the environment. The heat of vaporization of CCl2F2 is 289 J/g. What mass of ...

*January 9, 2013*

**chem**

thanks! also what does a compound have to have to have dipole-dipole and also dispersion forces Identify the type or types of intermolecular forces present in each substance. hydrogen peroxide, HOOH i put dispersion forces and hydrogen bonding. but its wrong. is it also dipole...

*January 9, 2013*

**chem**

and would the same be for CH3CH2CH2Cl or CH3CH2Cl where the first one has more df?

*January 9, 2013*

**chem**

so chain 1 has more dispersion force?

*January 9, 2013*

**chem**

Which member in each pair has the stronger intermolecular dispersion forces? CH3CH2CH2I or CH3CH2I or neither? how do you know this

*January 9, 2013*

**chem please help!**

thanks bobpursley. drbob222 you answered the first part but i also needed helpp on the second

*January 8, 2013*

**chem please help!**

Krypton gas is four times denser than neon gas at the same temperature and pressure. Which gas is predicted to effuse faster? i got neon which is correct but How much faster? how many times? i don't know how to get htis

*January 8, 2013*

**math**

what is the next two numbers in the pattern 75,74,72,69,65,...

*January 8, 2013*

**chem**

thanks how do i know how much faster?

*January 8, 2013*

**chem**

Krypton gas is four times denser than neon gas at the same temperature and pressure. Which gas is predicted to effuse faster?

*January 8, 2013*

**chem**

its suppose to be a ratio

*January 8, 2013*

**chem**

You have two flasks of equal volume. Flask A contains H2 at 0°C and 1 atm pressure. Flask B contains CO2 gas at 0°C and 2 atm pressure. Compare these two gases with respect to each of the following mass of gas (Flask A:Flask B)

*January 8, 2013*

**plzz HELP me**

Hey stop being mean!!!!! It's true she suppose to help, not to give answers. Also she is not going to be there when you take the real test.... What if you're youre teacher asks you questions about this.... Learn little guy..

*January 3, 2013*

**Math**

oh, it's c

*December 30, 2012*

**Math**

A car salesman receives $575 a week in addition to 3% commission on all cars whose sticker price is above $4,500. One week he sold a Ford for $8,785 and a Buik for $5,832. How much did he earn that week? A. $749.96 B. $838.55 C. $1013.51 D. $4,385.10 Explain how you got your ...

*December 30, 2012*

**english langage arts**

@Writeacher, I don't get why your so 'furious,' all the time or is that your way of showing off. If you can go a day of helping someone without criticizing them, the person will actually want to thank you. And the story is "Fire Pond."

*December 30, 2012*

**Geometry**

Two cylinders have the same volume. If the radius of cylinder I is 3 times the radius of cylinder II, then the height of cylinder II is how many times the height of cylinder I? A. 12 B. 9 C. 6 D. 3 Please explain how, if possible.

*December 29, 2012*

**Math**

In the town of Niceville, a local lottery is held once a year for the residents. Lottery tickets cost 50 cents apiece. Each lottery ticket contains four numbers, from 1 to 20. The lottery machine will select six numbers from 1 to 20. A winning ticket, worth $100, will contain ...

*December 29, 2012*

**Algaebra**

Two functions f and g are defined by f:x = 25 /(3x-2) g:x = x^2 Find the composite function Please show all calculations, thank you!

*December 19, 2012*

**Algaebra**

Two functions f and g are defined by f:x = x^2 + 3 g:x = 2x+1 Find the function fg Please help and show all working out,i got the answer for it but i really don't understand it!!! Thank You

*December 19, 2012*

**Complex Algaebra, Plz Help!!**

Could you ellaborate further on how you got your answer for b please Damon. The composite function fg thank you

*December 19, 2012*