Tuesday

September 27, 2016
Total # Posts: 656

**science**

Name the type of reaction that the equation represents? 2Cu + O2 -------> 2CuO

*February 11, 2012*

**math**

208 times 2

*February 4, 2012*

**science**

if the distance between crest were 1.5 meters apart, and 2 crest pass the pole each second, what would be the speed of the wave ?

*February 1, 2012*

**Science**

Which distance is the greatest ? A. The distance across the Milky Way Galaxy. B. The distance to the nearest star Cluster. C. The distance across the solar system. D. The distance to the nearest Galaxy.

*January 30, 2012*

**algebra**

for the algebraic function described by the expression x^2+2x-6 and written as the function f(6) = x^2+2x-6, what is the evaluation of f(6)?

*January 30, 2012*

**8 Grade Math**

At the same time that a flagpole casts a 4.5 m shadow , a meter stick casts a 1.5 m shadow. How tall is the flagpole ?

*January 25, 2012*

**Pre-Calculus**

Verify: 1/(1-sintheta) * 1/(1+sintheta) = sec^2theta sec^2theta is the answer, it would be great if someone can do the steps for me. thank you.

*January 23, 2012*

**math**

The tail on Alex 's dog is 5 1/4inches long.This lenght is between which two inch-marks on a ruler?

*January 3, 2012*

**Chemistry**

1) A compound has the following percentages by mass: barium, 58.84%; sulfur, 13.74%; oxygen, 27.43%. Determine the empirical formula of the compound. 2) If a 1.271-g sample of aluminum metal is heated on a chlorine gas atmosphere, the mass of aluminum chloride produced is 6....

*December 30, 2011*

**Physics**

Vf2=(m1+m2)(Vo1)/m1 m1=truck; m2=car; Vo1=initial speed of truck. mo1Vo1=mf1Vf1+mf2Vf2; substitute Vf2 to find Vf1

*November 19, 2011*

**Chemistry**

How many grams of NH3 can be produced from 3.26 moles of N2? How many grams of H2 are needed to produce 13.99 g of NH3?

*November 6, 2011*

**Chemistry**

Use a grammatically correct English sentence to describe how the mass in amu of one molecule of a compound is related to the mass in grams of one mole of that compound.

*November 1, 2011*

**Physics**

A girl throws a stone form the top of a building with an initial velocity of 20.0 m/s upward. The building is 50.0 m high and the stone just misses the edge of the roof on its way down. Draw a v vs t graph, find time needed for stone to reach max height, find max height, time ...

*October 1, 2011*

**Physics**

A person pushes on a 62-kg refrigerator with a horizontal force of -256 N; the minus sign indicates that the force points in the −x direction. The coefficient of static friction is 0.61. (a) If the refrigerator does not move, what are the magnitude and direction of the ...

*September 27, 2011*

**pre-calculus**

Could someone please help me with this problem? square root of (2x+1) -5 = 8 I think I take the 5 and add it to the 8 and then I have square root of (2x+1) = 13 then do I square both sides and end up with 2x+1 = 13^2 2x+1=169 2x+1-1=169-1 2x=168 x=84 am I even close on this?

*September 20, 2011*

**Physics**

The elevator has not moved yet, so the normal force and the force of the man's weight are equal. The answer is 431.2 N n - mg = ma n - mg = 0, so n = mg n = 44.0*9.8 n = 431.2

*September 9, 2011*

**algebra**

so yhu just find a common denominator???

*September 7, 2011*

**algebra**

5. If x=8 and y=3, find the value of 4/x - 1/y. well i would substitute 8 for x and 3 for y. then it would be 4/8 - 1/3. 0.5 - 0.33333 would it then be 0.2333? 8. If x=6 and y=5, find the value of x/8 + 2/y. well i would substitute 6 for x and 5 for y. then it would be 6/8 + 2...

*September 7, 2011*

**Physics**

As two trains move along a track, their conductors suddenly notice that they are headed toward each other. The figure below gives their velocities v as functions of time t as the conductors slow the trains. The slowing processes begin when the trains are 240 m apart. What is ...

*September 7, 2011*

**Physics**

actually should I do 2.3 m/s divided by 343 seconds to get .00599 m/s^2?

*September 5, 2011*

**Physics**

From t = 0 to t = 5.00 min, a man stands still, and from t = 5.00 min to t = 10.0 min, he walks briskly in a straight line at a constant speed of 2.3 m/s. (a) What is his average velocity vavg in the interval 2.000 min to 7.90 min? I found this to be 1.15 m/s (b) What is his ...

*September 5, 2011*

**Calculus**

Find the derivative of y with respect to x. y= (lnx)/(3+4lnx) Should I start by using the quotient rule?

*September 4, 2011*

**Calculus**

Find the derivative of y with respect to x. y= [(x^5)/5]lnx-[(x^5)/25] How would I go about doing this? Should I use the product rule to separate (x^5)/5]lnx ?

*September 4, 2011*

**math**

The area of a square with a side length of s is s to the second power. What is the area of a square with a side length of 3 inches?

*August 26, 2011*

**math**

Thank You So Much Sam! :)

*July 25, 2011*

**math**

Use the “difference of squares” rule to factor the following expression 49-4y^2 my answer is going to be (7-2y)(7-2y) I wasnt sure if it could of been (7-2y)(7+2y)

*July 25, 2011*

**Algebra**

Andrew factored the expression 28x^3-42x^2+35x as 7x(4x^2+6x-5). But when Melissa applied the distributive law and multiplied out 7x(4x^2+6x-5) , she got 28x^3+42x^2-35x ; thus, Andrew’s solution does not appear to check. Why is that? Please help Andrew to understand this...

*July 25, 2011*

**social studies **

what was the cause of the boston massacure?

*June 6, 2011*

**algebra**

An online retailer had a sale that lasted 5 days. Approximately how many people visted the site during the sale? Assume that people who visited on more than one day were only counted once. Day 1 20,000 Day 2 25,000 Day 3 30,000 Day 4 25,000 Day 5 20,000

*June 5, 2011*

**algebra**

a celing in a new home rises 8 feet over a distance of 29 feet, Find the slope of this celing. round your answer to two decimals places.

*June 5, 2011*

**Health**

Sara? Which one is someone smoking Cocaine and not Crack Cocaine send me the exact link to only a photo of someone smoking Cocaine.

*June 4, 2011*

**Health**

could u please send me the exact link?

*June 4, 2011*

**Health**

Can someone answer

*June 4, 2011*

**Health**

Ok, I know that Crack Cocaine can be smoked, but can Cocaine be smoked? If so I need a picture of someone smoking Cocaine not Crack Cocaine though and for the picture just copy and paste the link of the direct picture ASAP

*June 4, 2011*

**McLoughlin**

Yes, Oregon territory is correct, and yes that is EXACTLY what happened between McLoughlin and Simpson,

*June 4, 2011*

**Health**

yes can someone please answer my question

*June 4, 2011*

**Health**

Srry I wrote that above wrong I meant to say wht r the effects on the body?

*June 4, 2011*

**Health**

Thanks Sara, so the effects on the so wht r the effects on the body>?

*June 4, 2011*

**Health**

but i need the effects cocaine has on the body in one separate section and then the mind separate and then behavior

*June 4, 2011*

**Health**

Ok wow thanks very much but for that exact question that i asked---- for the effects on the body, mind, and behavior could u please like write wht the effects on the body are and then the effects on the mind and then effects on behavior all separate and organized ASAP please i...

*June 4, 2011*

**Health**

What are the short term effects of Cocaine: When someone consumes this substance what effect will it have on their body, mind, and behavior? Please answer ASAP I really need the answer... and please don't give the website for me to find the info, I don't have enough ...

*June 4, 2011*

**Health**

what pic do i use?

*June 4, 2011*

**algebra 1**

Write a point-slope equation for the line with the given slope that contains the given points. m= -1;(-3,6)

*June 4, 2011*

**math**

for math homework it is algebra and we have to use a ti-83 plus calculator to convert things, thats the one our teacher told us. but i do not have one. so i was wondering if anybody knew of a website that i could use a free calcutar online?

*June 1, 2011*

**Spanish**

this is why i love being puerto rican lol 30.c 31.a 32.d 33.c 35.c 36.a 37.b 39.b 41.c 42.b

*June 1, 2011*

**Spanish**

this is perfectly right

*June 1, 2011*

**College Stats**

.09 is larger. Think of decimals like they are cents. $.09 is larger than $.05. If you rounded the .09 up one, it would be similar to comparing a dime and a nickel.

*May 8, 2011*

**math**

but if she wants to earn 150 and she already has 20 would she subtract 20 from 150? how is it 20+7m<150

*May 4, 2011*

**math**

for this question, if carolwants to earn $150.00 but she already has earned $20.00 would she subtract that or just look for an inequality

*May 4, 2011*

**math**

i do not want an answer i just dont get how to do this problem. i have a packet and i do the ones i get and ask for help with the ones i dont. i just ask for an explanation on how to do the questions that i do not understand.

*May 4, 2011*

**math**

carol wants to earn at least $150.00 for her charity while running in a race. she will earn $20.00 for participating plus $7.00 for each mile she runs. if m represents the number of miles shre runs, which inequality represents the money carol wants to earn?

*May 4, 2011*

**math**

thank you.

*May 4, 2011*

**math**

Katie converts the outside temperature from degrees fahrenheit, f, to degrees celsius, c. She uses the formula below to convert the temperature. (F-32)5/9=c if the outside temperature is 50 degrees fahrenheit, what is the outside temperature in degrees celsius

*May 4, 2011*

**math**

thank you.

*May 4, 2011*

**math**

ok so it would be b+a<2b because b and a added together would be less than b times 2?

*May 4, 2011*

**math**

The cost of one burrito,b,and one taco,a, is less than the cost of two burritos. Which inequality represnts this relationship

*May 4, 2011*

**math**

thank you again

*May 4, 2011*

**math**

90?

*May 4, 2011*

**math**

jordon has $608 in his savings account. He withdraws 15% of the money to pay for school clothes. which is the best estimate for the amount of money jordon withdraws?

*May 4, 2011*

**math**

ok i understand now thank you.

*May 4, 2011*

**math**

i do not understand how to do this. can you please explain.

*May 4, 2011*

**math**

Renee must solve the equation 4x+12=6x. If she subtracts 4x from the left side of the equation, what should renee write on the right side of the equation?

*May 4, 2011*

**math**

what is the product of the expression below? (2x-5)(2x-3)

*May 3, 2011*

**math**

thank you.

*May 3, 2011*

**math**

20/2.80=35/x 20x=35*2.80 20x=98 divided by 20 on both sides x=4.90?

*May 3, 2011*

**math**

a 20-ounce bag of popcorn costs $2.80. if the unit price stays the same, how much does a 35-ounce bag of popcorn cost?

*May 3, 2011*

**Government**

OKay , I will try. I guess I just didnt understand how politics came into it. I read that political admin dichotomy is the separation between politics and public administration. For example my books says that a city council does not get involved in administration or a city ...

*May 2, 2011*

**Government**

Hello, I need this question explained. You dont have to give me the answer ,but I just need a break down ..in order to know what direction i need to go in. I know what it means to be political..I guess Im just confused by the question. Please Help ! ( Question Below) Research ...

*May 2, 2011*

**Science**

I am doing a science project about which juice cleans pennies best. I tried lemon, orange, and apple juice. I did three trials of my experiment. On average, the orange juice cleaned the pennies much better than the lemon or apple juice. My research shows that lemon juice ...

*April 28, 2011*

**geometry**

an isosceles trapesiod has legs that measure 24 units each. If the perimeter of the trapeziod is 150 units, what is the legth of its median?.

*April 16, 2011*

**Biology**

How does the CVS, urinary and respiratory systems work together to maintain homeostasis?

*April 14, 2011*

**chemistry**

What is the pH of a sodium acetate solution prepared by adding 0.820g of sodium acetate to 100.0mL of water at 25 degrees?

*March 29, 2011*

**Chemistry**

What is undergoing oxidation in the redox reaction represented by Fe Fe3+ Cl2 Cl- Pt

*March 28, 2011*

**Chemistry**

determine the redox reaction represented by the following cell notation Mg Mg2 Cu2 Cu

*March 28, 2011*

**Chemistry**

Calculate the concentration of H3O+ that contains 5.5 x 10 ^-5 moles/L OH- at 25 degrees

*March 28, 2011*

**volume**

A cylindrical aquarium has a 10 foot diameter and an 18 foot height and holds 10,400 gallons of water. What is the aquariums's volume in cubic feet?

*March 25, 2011*

**volume **

A can has is 21 centimeters tall and has a diameter of 8 centimeters. What is the volume of the can?

*March 25, 2011*

**Chemistry**

Is 1 mol of pure salt greater than 1 mol of iron?

*March 18, 2011*

**AN UNCERTAIN HORIZON**

a stalin

*March 17, 2011*

**Math**

200 divided by 2x^2

*March 16, 2011*

**world history**

Either c or d. because change is always hapening. but progress is a goal we all work towards. wars and plaques can lead us in a decline where we would have to build society back up.

*March 15, 2011*

**chemistry**

find the percent of BaBr^2*4H^2O

*March 15, 2011*

**english**

opposite of cold \choices of answers bucket quick preset raise rock sick sleep small story yell make large jump home glad close car bucket

*March 8, 2011*

**chemistry**

Arrange the following aqueous solutions in order of decreasing freezing points (lowest to highest temperature): 0.10 m Na3PO4, 0.35 m NaCl, 0.20 m MgCl, 0.15 m C6H12O6 and 0.15 m CH3COOH.

*March 8, 2011*

**Geometry - Math**

A 2 in frame surrounds a picture of 20in x 12in. Find the area of the frame.

*March 5, 2011*

**math algebra1**

janet and lynn live 8 miles apart in opposite directions from their office. if lynn lives 1 mile less than twice as far from the office as janet does, how far does each live from the office?

*February 28, 2011*

**math**

thank you! :)

*February 27, 2011*

**math**

mathmate~ in the last part of the list T/T you have a -1.00 but shouldnt it be +1.00? does that then change the final answer? thank you!!

*February 27, 2011*

**math**

You and your friend each have a coin. For each round, each of you flips your coin. If both coins show heads, your friend pays you $3. If both show tails, your friend pays you $1. If the coins don't match, you pay him $2. Is this a fair game?

*February 27, 2011*

**Chemistry**

You have a stock solution of 14.4 M NH3. how many mililiters of this solution should you dilute to make 1050mL of .220 M NH3 answer 16.o mL Question if you take a 10.5mL portion of the stock solution and dilute it to a total volume of .600L, what will be the concentration of ...

*February 21, 2011*

**Chemistry**

Hello, I don't really know where to begin with this question. Thanks in advance! Consider the mixing of 10.0 ml of 0.25M K2SO4 with 15.0 ml of 1.10M KCL. What is the concentration of K+, Cl- and SO4^2-? a) K+___ b) CL-___ c) SO4^2-___

*February 20, 2011*

**english 105**

Why Should one know the difference between prejudice and racism?

*February 10, 2011*

**economics 212**

B. automobile and bicycles are because if your gas goes up in price you are more likely to use your bike. The other three pairs are used together, so they are compliments.

*December 13, 2010*

**CHemistry**

Calculate the pH of a .25 M ammonium acetate (CH3COONH4) soluton. I thought u just did -log(.25) but it keeps saying that i have the wrong answer.

*December 8, 2010*

**chemistry**

What is the original molarity of an aqueous solution of ammonia (NH3) whose pH is 11.10 at 25 degrees C? (Kb for NH3=1.8 x 10^-5)

*December 8, 2010*

**Chemistry**

An aqueous solution of an unknown, monobasic weak base has an initial molarity of .176 M and a final[OH-] of .0000158 M. What is the Kb of the unknown base?

*December 8, 2010*

**Chemistry**

What is the original molarity of a solution of a weak acid whose Ka=3.5 x 10^-5 and whose pH is 5.28 at 25 degrees C?

*December 8, 2010*

**Chemistry**

Calculate the pH of an aqueous solution at 25 degress C that is .41 M in phenol (C6H5OH). Ka for phenol=1.3 x 10^-10.

*December 8, 2010*

**college**

part 2: take your calculated velocities, divide them, and inverse tangent

*December 1, 2010*