Wednesday

July 27, 2016
Total # Posts: 412

**Chemistry**

Rank the following molecules in order of water solubility. ch3ch2ch2ch3, ch3oh, nacl, and ch3chohcooh
*July 26, 2016*

**Chemistry**

Why water can be used as a solvent in paper chromatography?
*July 14, 2016*

**Math**

how to find the curved surface area of a cone when the height is 25mm and circumference is 132mm ?
*July 4, 2016*

**Math**

a hollow metal sphere has an internal radius of 20cm and an external radius of 30cm , given that the density of the metal is 7.8, find the mass of the sphere , expressing your answer in kg.
*July 4, 2016*

**Math**

The heights of three plants A,B and C in a garden are in the ratio 2 : 3 :5. their mean height is 30cm a) find the height of plant b b) if another plant D is added to the garden and the mean height of the four plant is now 33cm , find the height of D plant
*July 4, 2016*

**Algebra **

Is this sequence 10, 15, 20, 25, 30 an arithmetic or geometric sequence? Then find the explicit formula and recursive formula for the given sequence.
*May 17, 2016*

**PHYSICS VOLUME QUESTION!**

You are watering your lawn with a hose when you put your finger over the hose opening to increase the distance the water reaches. If you are pointing the hose at the same angle and the distance the water reaches increases by a factor of 4, what fraction of the hose opening did...
*April 27, 2016*

**PHYSICS ROLLING MOTION!!!**

A unicycle with a tire 44.0 cm in diameter travels 2.00 km. How many revolutions does the wheel make?
*April 26, 2016*

**PHYSICS HELP DENSITY**

An object hanging on a scale reads 24.0g when submerged in water, but 48.0g when submerged in oil (specific gravity 0.80) Find the density of the object.
*April 26, 2016*

**Physics! Rolling Masses! HELP**

The five masses below all have the same radius and a cylindrically symmetric mass distribution. They start to roll down an inclined plane, starting from rest, at the same time and from the same height. Give their order of arrival at the bottom. (a) Icm=935 g*cm2, M = 44g (b) ...
*April 25, 2016*

**Chemistry**

A student collected concentration data to determine the rate of the decomposition of N2O5 to NO2 and O2. The data were recorded in the table below. What is the rate law of this reaction? k[N2O5] k[N2O5]2 k k[NO2]
*March 10, 2016*

**geography**

Hello I need to find important cities located in the colony Delaware before the year 1776, but I had trouble finding any information could someone possibly help out?
*February 21, 2016*

**Science**

1.What information would a scientist need to discover whether a disorder had a genetic cause, an environmental cause, or a combination of the two? 2.How do mutations affect an organism? Why can some mutations have no effect? 3.Which of these traits or behaviors is most likely ...
*January 12, 2016*

**HELP_ME_PLEASE_VERY FAST**

1.What information would a scientist need to discover whether a disorder had a genetic cause, an environmental cause, or a combination of the two? 2.How do mutations affect an organism? Why can some mutations have no effect? 3.Which of these traits or behaviors is most likely ...
*January 12, 2016*

**Social Studies**

*sorry* I need the causes that happened during the railroad was constructed. I got one. Is this correct? While the railroad was begins constructed more homes were built. Is that one?
*January 12, 2016*

**Social Studies**

Hello!I need help with my homework. What causes did the transcontinental railroad do? Thank You for your help.
*January 12, 2016*

**Reading/ELA**

Thank You!!! :)
*January 11, 2016*

**Reading/ELA**

Hello! I have a hard time finding out what these words mean? Can you send me any websites? That would help so much! Also, can you send any educational websites for me. I only got an "A" on math and the rest of the subjects are B's. I want to pass all of these ...
*January 11, 2016*

**Math**

Thank You. I have to write an essay about it. If you have any websites, please sent me some.
*January 6, 2016*

**Math**

How do you add fraction with whole numbers? Please answer fast.
*January 6, 2016*

**Reading/ELA**

Thank You
*January 5, 2016*

**Reading/ELA**

What does the word(s) Elongates,elastic,rigid,accumulate, underlying,intricate,vanish,and replenishing mean?
*January 5, 2016*

**texas history**

how and why did spanish groups come to texas?
*December 9, 2015*

**Social Studies**

What were seven weaknesses of the articles of confederation(please answer quick) .Not strong federal government .strong state government
*December 8, 2015*

**Math**

The sum of a number and its reciprocal is 2 9/10. Find the number.
*December 5, 2015*

**algebra**

Use Gaussian elimination to find the complete solution to the system of equations, or state that none exists. x+3y+6z=6 y-4z=0
*November 12, 2015*

**Finite**

Assume that the pond contains 120 fish: 97 green, 22 yellow, and 1 red. A contestant pays $0.60 to randomly catch one fish and receives $0.40 if the fish is green, $0.95 if the fish is yellow, and $11.00 if the fish is red. How much (on average) does the carnival gain on each ...
*October 13, 2015*

**chemistry**

6.3E7 cm converted to mm would be 4.3cm converted to in would be
*October 4, 2015*

**MATH**

The position function of a particle is given by s(t) = t^{3}-3t^{2}-7t, t\ge 0 where s is measured in meters and t in seconds. When does the particle reach a velocity of 20 m/s? PLEASE HELP. I found the derivative which is 3t^2-6t-7. Now do I set that equal to 20 or do I try ...
*September 22, 2015*

**Accounting Principles I**

I have been trying to figure this out forever and just can't. Here is the problem: Reported sales of $300,000 write-offs of uncollectible accounts of $10,000 against the allowance for doubtful accounts and a decrease in net accounts receivable of $40,000 during 2014. What ...
*September 18, 2015*

**Intermediate Algebra (math)**

Thanks Bosnian. The way you worked it is actually what I had done before I posted the question, but I was unsure.
*September 17, 2015*

**Intermediate Algebra (math)**

Ok, this makes sense to me. I wrote out your explanation on paper and did the problem on paper. So, the answer is 2x-3x? p.s. thanks so much for responding, really appreciate the help.
*September 17, 2015*

**Intermediate Algebra (math)**

(8x^2y^2+4xy^2-12y^2) ÷ 4xy^2 I received this problem. I was told to divide the rational expression. The problem I am having is I feel like something is missing. I only understand to divide rational expressions we take the first rational expression and multiply it by ...
*September 17, 2015*

**algebra**

(5t-6c+4)+(-8t+9c) 5t-6c+4-8t+9c -3t+3c+4 answer: -3t+3c+4 I removed parentheses and combined like terms.
*September 17, 2015*

**Maths**

x = Catherine's age (now) 3x = Robert's age (now) in eight years, (x + 8) = Catherine's age (3x + 8) = Robert's age (3x + 8)/(x + 8) = 2/1 3x + 8 = 2x + 16 3x-2x+8=2x-2x+16 x+8=16 x+8-8=16-8 x = 8 Catherine is 8 years old after 8 years Robert is 24 years old ...
*September 17, 2015*

**Intermediate Algebra (math)**

(8x^2y^2+4xy^2-12y^2) ÷ 4xy^2 I received this problem. I was told to divide the rational expression. The problem I am having is I feel like something is missing. I only understand to divide rational expressions we take the first rational expression and multiply it by ...
*September 17, 2015*

**Math**

9a^2 -6ab + b^2 + c^2
*September 17, 2015*

**science**

Animals can't live without a nucleus. Prokaryotes are cells without a nucleus. DNA is typically housed in the nucleus, but in a prokaryote cell the DNA is floating around freely in the cell. Prokaryotes generally are bacteria. People and animals can't live without a ...
*September 17, 2015*

**Intermediate Algebra (math)**

m = 2rg^2 – 5rx solve for x I worked this problem, but I don't think its right and just can't figure out anything else. I took the term -5rx and thought how can I get that x removed and alone so that I can get it isolated on one side to solve for x To do this, I ...
*September 10, 2015*

**Physics**

The speed of light is about 3.00 x 10 to the power of 5 km/s. It takes approx. 1.28 seconds for light reflected from the moon to reach Earth. What is the average distance from Earth to the moon? Thank you
*May 8, 2015*

**Physics**

You know there are 1,609 metres in a mile. The number of feet in a mile is 5,280. Use these equalities to answer hoe many centimetres equals once inch. Thank you.
*May 8, 2015*

**Physics**

How far can a person run in 15minutes if he or she runs at an average of 16km/hr? Thank you
*May 8, 2015*

**Physics**

The average speed of a car was 60m/s by the time it reached the finish line. The car moved in a straight line and travelled from the starting line to the finish line in 8.0 sec. How far was the finish line? d = v x t d = 60 x 8 = 480 metres. Thank you
*May 8, 2015*

**Physics**

The space shuttle releases a space telescope into orbit around the earth. The telescope is traveling at a speed of 1700m/s in 25 seconds. What is the distance of the satellite? d = v x t d = 1700 x 25 = Is that the correct formula? Thank you.
*May 8, 2015*

**Chemistry**

Hi, Iodine has 53 electrons and configuration of: 2, 8, 18, 18, 7. Why does the fourth shell not reach maximum and therefore it picks up 7 electrons and begins a new shell. Thank you.
*April 27, 2015*

**Chemistry**

Why is Potassium and Bromide KBr? Why does Br not follow 2n2? Br = 35 electrons, 2,8,18,7 why does the shell not fill to 32 and is happy with one of Potassium electrons. Thank you kindly.
*April 19, 2015*

**Chem 12**

0.300 mol of S2 and 0.310 mol of C are placed in a 1.00 L flask and allowed to reach equilibrium according to this reaction: S2(g) + C(s) ⇔ CS2(g) At equilibrium, 0.271 mol of CS2 is present. The value of Keq for the reaction is ---- a)9.3 b)0.91 c)240 d)2.9 Not too ...
*April 4, 2015*

**math**

Vanilla Box Company is going to make open-topped boxes out of 17 × 13-inch rectangles of cardboard by cutting squares out of the corners and folding up the sides. What is the largest volume box it can make this way? (Round your answer to one decimal place.)
*March 30, 2015*

**chemistry**

I believe that the answer is D
*March 25, 2015*

**chemistry**

The answer I think is C.
*March 24, 2015*

**chemistry**

I believe that the answer is C.
*March 24, 2015*

**Chemistry**

Yes, C.
*March 23, 2015*

**Arithmetic Progressions **

The second term of an arithmetic progression I four times the fits term, and the first term is ten. Find the common difference and hence find the sum of the first 12 terms.
*March 10, 2015*

**chem**

Write the equilibrium expression for the following: 2NOCl (g) ==== 2 NO + Cl2 (g)
*March 1, 2015*

**chem**

The solution of known concentration to use to evaluate Z was prepared as follows: 2.00mL of 0.00201 M KSCN and 18.0 ml 0.200 M Fe (NO3)3. Assume that all of the SCN- has been converted to Fe(SCN)2t in this solution. Fe3+ SCN- ==== Fe Fe(SCN)2+ I don't really know how to do...
*March 1, 2015*

**physics**

What is the relationship between the coefficient of friction and the time that it takes the object to reach the bottom of the ramp?
*February 25, 2015*

**chem II**

0.959 g of a hydrocarbon is dissolved in 10.00g of benzene. The freezing point of the solution is 1.16C. Find the molecular mass of the hydrocarbon. Benzene has a Kf of 5.12 and a freezing points of 5.53 degrees C. Not sure how to go about solving this problem? Thanks!
*February 8, 2015*

**chemistry**

4. A sulfuric acid solution containing 571.6 g of H2SO4 per liter of solution has a density of 1.329 g/cm3 . Calculate a. The mass percentage b. The mole fraction c. The molality d. The molarity of H2SO4 in this solution
*February 5, 2015*

**chemistry II**

What is the molarity of a solution of acetic acid if 35.00mL is titrated to the end point with 68.20ml of 0.750M KOH? What is the percentage by mass of acetic acid solution? The density of acetic acid is 1.06 g/ml
*February 1, 2015*

**chemistry**

In an acid-base titration, 33.12ml of 0.1177 M H2C2O4 was titrated with 0.2146 M NaOH to the end point. What volume of the NaOH solution was used?
*February 1, 2015*

**science**

Calculate the molarity of a solution which contains 6.456g of Na2CO3 dissolved in 250.0 ml of solution.
*February 1, 2015*

**statistics help please**

The employment percentages for men versus women in a computer company last year were 80% and 40%, respectively. At the beginning of this year, they had 150 men and 60 women currently hired. The owner of the company wishes to check their hiring practices and ensure that the ...
*January 23, 2015*

**Algebra 1 please help**

There are 15 violinists in the orchestra this year. Next year, two violinists will leave and some new violinists will join the orchestra. If v is the number of violinists who will join the orchestra, write an expression to represent the number of violinists in the orchestra ...
*January 14, 2015*

**Algebra**

Mrs. Delgado has some young orange trees. He wants to plant them in 46 rows. If t is the total number of orange trees, write an algebraic expression to represent how many trees he can plant in each row. Please help write the expression. Thanks.
*January 14, 2015*

**Science please help thx**

Convection cells are created by very hot material deep in the mantle rising, then cooling, sinking again and repeating the cycle. This process occurs because of the uneven distribution of ? Within the earth? Please fill in the question mark with a answer. a. Crystal plates B. ...
*January 12, 2015*

**Science please help**

Some of the water flows over the dam and is converted to energy, some water evaporates into the air. What spheres does the water, or hydrosphere interact with this example? a. Geosphere and atmosphere B. Atmosphere and biosphere C. Crysophere and atmosphere D. Asthenosphere ...
*January 12, 2015*

**Science**

What is the main method of heat transfer from the core to the crust of earth? A. Conduction B. Convection C. Radiation
*January 12, 2015*

**Math 1 please help**

A clothing store has the sign shown in the shop window. Pani sees the sign and wants to buy 3 shirts and 2 pairs of jeans. The cost of each shirt before the discount is $12 and the cost of each pair of jeans is $19 before the discount. Question 1. Pani says she should get a $3...
*January 8, 2015*

**Physics**

How much force is required to accelerate a 1500kg car to a speed of 17m/s in a distance of 45m? Thank you.
*January 3, 2015*

**Physics**

Thank you kindly.
*January 3, 2015*

**Physics**

A mass of 25kg is acted on by a force of 56N. If a friction force of 12N exists, find the acceleration of the mass. I have worked the following: a=F/M = 44/25 = 1.76 m/s2 Am I correct? Thank you.
*January 3, 2015*

**Physics**

Thank you. Can you explain d=1/2 a t^2. What does the ^ mean?
*January 1, 2015*

**Physics**

A force of 270N acts on a mass of 13.5kg for 13sec. Calculate a) the acceleration b) the final velocity c) the distance covered. a)F=m*a, so 270=13.5*a/13, answer 260m/s b)Not sure which formula. c)Formula d=v*t, once velocity is worked out in question b). I am not sure with a...
*January 1, 2015*

**Physics**

A 6kg mass is acted on by a force for 60sec and acquires a speed of 10m/s. What is the value of the force? I have calculated this as below: F = ma Therefore F = 6*10/60 F=1N Am I on the correct path? Thank you kindly
*January 1, 2015*

**Physics**

What force is required to give a 1kg body a velocity of 5m/s after acting for 5sec? I know I can use F=mxa What do I do with the 5sec? Thanks
*January 1, 2015*

**Algebra 2**

Can someone please help me do the follow problem... ...The cost (in dollars) of producing x sneakers in a factory is given by c(x)=60x+750. The number of sneakers produced in (t) hours is given by x(t)=50t. Fund c(x(t)). Evaluate c(x(5)) and explain what this number represents.
*December 16, 2014*

**Algebra ASAP thx**

Tim is reading a book. On Monday he reads 3 pages. On each day after that, he reads 3 times the number of pages that he read on the previous day. How many pages does he read on Thursday?
*December 15, 2014*

**Algebra please help answer**

A certain colony of bacteria triples in length every 10 minutes. It's length is now 1 millimeter. How long will it be in 40 minutes? Please help answer thx
*December 15, 2014*

**Algebra**

Divide
*December 10, 2014*

**Algebra**

How many 0.6 liter glasses can you fill up with a 4.5 liter pitcher?
*December 10, 2014*

**Algebra**

Barbara can walk 3200 meters in 24 minutes. How far can she walk in 3 minutes?
*December 10, 2014*

**Calculus**

a particle moves along the x-axis at a velocity of v(t)=1 sqrt(t), t>0. at time t=1 , its position is x=4. find the acceleration and position functions for the particle
*December 4, 2014*

**Science **

Polysaccharides break apart by the process of hydrolysis and need _________ for this process. Can you please help me fill in the blank.
*December 3, 2014*

**Algebra please help**

1 hour= 3,600 seconds and 1 mile=5,280 feet. Make a conjecture about how you would convert a speed of 15 miles per hour to feet per second. Then convert. Please help answer thx
*November 20, 2014*

**Algebra**

Would you divide 5280 by 3600
*November 19, 2014*

**Algebra**

One hour = 3,600 seconds and 1 mile= 5,280 feet. MAke a conjecture about how you could convert a speed of 15 miles per hour to feet per second. Then convert please help answer
*November 19, 2014*

**Algebra**

What is the result if you multiply a number of cups by 8 fl oz/ 1 cup and then multiply the result by 1 cup/ 8 fl oz? Give an example thx
*November 19, 2014*

**Math please help out **

What are the dimensions of a football field in feet? If one side is 53 1/3 yards and the other is 120 yards? Please help answer B. A chalk line is placed around the perimeter of the football field. What is the length of this line in feet? C. About how many laps around the ...
*November 19, 2014*

**Algebra help**

Can you help answer these questions? Thanks ASAP
*November 19, 2014*

**Algebra please help out**

How would you convert 5 feet 6 inches to inches?
*November 19, 2014*

**Algebra please help out**

In Beijing in 2008, the women's 3,000 meter steeplechase became an Olympic event. What is this distance in kilometers? Please help answer thx
*November 19, 2014*

**Algebra please help out **

If the number in the numerator of a unit rate is 1, what does this indicate about the equivalent unit rates? Please help answer and give an example. Thanks
*November 18, 2014*

**chemistry**

You perform the following titration: You placed 35 mL of H2S in a flask and placed it under a buret. The buret contains 0.243M Sr(OH)2 and you are going to titrate the H2S with the base. You titrate until the color changes. At that point, you record that you used 10.15mL of ...
*November 14, 2014*

**Algebra 2**

(192x^2y+72x^3)-(24rxy-9rx^2) I need help factoring completely in groups and can you please show all your work thank you
*November 6, 2014*

**Math**

Solve 2x^3y^-3*2x^-1y^-3
*October 23, 2014*

**Math**

Thank you so much
*October 21, 2014*

**Math**

Or simplify down to the very end
*October 21, 2014*

**Math**

I need to solve it
*October 21, 2014*

**Math**

((1/2)^-5)^2
*October 21, 2014*

**Math**

How do you solve the equation by completing the square X^2+4x=10
*October 4, 2014*