Saturday

October 10, 2015
Total # Posts: 394

**Organic Chemistry**

Simple Distillation: What is the molar composition of the vapor in equilibrium with a boiling liquid that has a composition of 60% A and 40% B? I know that the vapor should be richer in the lower-boiling substance, which is A in this case. And: If a sample of the vapor has the...
*October 9, 2015*

**calculus**

Find the resultant vector. 1) A force of 35 grams and 45 grams applied at right angles. 57.009 g at 52° with respect to the 35 kg force 2) Velocities of 400 mph due north and 500 mph due east. 640.31 mph at 51° with respect to the 400 mph force 3) Displacements of 90 ...
*October 5, 2015*

**Organic Chemistry**

I spotted a commercial TLC plate, coated with silica gel, with a pure benzoin solution. After running the TLC plate in methylene chloride, the benzoin separated into two different spots. Rf values are 0.6 and 0.9. What explains this? A pure material should have only one spot ...
*October 2, 2015*

**world geography**

what ethnic group dominate iran and afghanistan
*September 29, 2015*

**world geography**

What major cultural feature is common throughout the region? What other cultural features could you use to further divide the Persian Gulf and interior Southwest Asia into more regions?
*September 29, 2015*

**Organic Chemistry**

Are n-pentyl chloride and n-pentyl bromide miscible or immiscible? Why?
*September 27, 2015*

**Algebra**

If 18g of a radioactive substance are present initially and 8 yr later only 9 g remain, how much of the substance will be present after 20 yr?
*September 22, 2015*

**health**

there neexds to be four.?
*September 17, 2015*

**health**

what are four things that effect how many servings a person needs of each food group?
*September 17, 2015*

**Organic Chemistry**

I have already calculated the volume of ethyl alcohol need to dissolve 0.300 g of sulfanilamide at 78 degrees Celsius. I got 1.429 mL ethyl alcohol. My question is: how do I calculate how many grams of sulfanilamide will remain dissolved in the mother liquor (ethyl alcohol) ...
*September 14, 2015*

**riddle**

20 pigeons sat on the branches of a tree. A man hit 1 pigeon with a cannon. How many were left on the tree?
*September 12, 2015*

**alGEBRA 1**

the ratio of lemon juice to water in lemonade is 3:7 ,. if 9 cups of water aer used to make a pitcher of lemonade , how many cups of lemon juice are needed
*September 12, 2015*

**alGEBRA 1**

how???
*September 12, 2015*

**alGEBRA 1**

seven taken away from a number is it a number or varibale?
*September 12, 2015*

**alGEBRA 1**

write two verbal expressions for the following: 4+m write a verbal expression for the following;7-y
*September 12, 2015*

**Math algeabra**

when i did this problem i got this as my answer1181.102ft/h
*September 9, 2015*

**Math algeabra**

im confused?
*September 9, 2015*

**Math algeabra**

why wyu
*September 9, 2015*

**Math algeabra**

no i dont have it on my chart
*September 9, 2015*

**Math algeabra**

i have 100 cm= 1 meter
*September 9, 2015*

**Math algeabra**

this is the conversions on the list 60 seconds=1 minute 60 minutes=1 hour 24 hours=1 day 7 days= 1 week 52 weeks= 1 year 12 inches=1 foot 3 feet=1 yard 36 inches= 1 yard 5280 feet= 1 mile 1760 yards= 1 mile 100 centimeters= 1 meter 1000 meters = 1 kilometer 8 fluid ounces= 1 ...
*September 9, 2015*

**Math algeabra**

you have to use the conversions that u have on the paper only
*September 9, 2015*

**Math algeabra**

i dont have those measure ment on my paper
*September 9, 2015*

**Math algeabra**

A tortoise can travel 10 cm per second. what is the turtoise's speed in feet per hour?
*September 9, 2015*

**Physics**

Find x and y components of a vector which is 10 units in length and 40 degrees below the +x axis. I honestly don't even know how to begin this problem .. Please help me !
*June 15, 2015*

**Math (PLEASE HELP!)**

So answer to b would be 24?
*June 6, 2015*

**Math (PLEASE HELP!)**

The temperature of an enclosure for a pet snake should be about 27°C, give or take 3°C. (show your work) a) What absolute value expression can be used to represent this situation? b) Use the expression to determine the temperature range the enclosure should have.
*June 6, 2015*

**Math**

The temperature of an enclosure for a pet snake should be about 27°C, give or take 3°C. (show your work) a) What absolute value expression can be used to represent this situation? b) Use the expression to determine the temperature range the enclosure should have.
*June 6, 2015*

**Math**

No, the answer is two solutions, Correct?
*June 1, 2015*

**Math**

Is it no solutions?
*June 1, 2015*

**Math**

I still don't get it... Should I graph them as points? Because when I graph just x=-1 and ect... I get straight lines going up and down at the following points, (-1,0), (0,0),(1,0),(2,0),(3,0).
*June 1, 2015*

**Math**

How many real number solutions does the equation have? y=3x^2-5x-5 A)one solution B)two solutions C)no solutions D)infinitely many solutions I can't figure this question out. Any help would be amazing.
*June 1, 2015*

**Math (check answers)**

Oh great! Thank you so much!
*June 1, 2015*

**Math (check answers)**

Since the opening night, attendance at Play A has increased steadily, while attendance at Play B first rose and then fell. Equations modeling the daily attendance y at each play are shown below, where x is the number of days since the opening night. On what day(S) was the ...
*June 1, 2015*

**Math (check answers)**

1)Identify the sampling method. You want to determine the number of text messages students at your school send in a month. You go to the cafeteria and randomly ask students as they come out of the lunch line. A)Random*** B)Systematic C)Stratified D)None of these. Would the ...
*June 1, 2015*

**Math (check answers)**

Thank you so much!
*June 1, 2015*

**Math (check answers)**

1)What is the simplified form of the expression? 5d^6*d^-12? A)5d^-72 B)6d^-72 C)5d^-6**** D)6d^-6 I think that the answer is C. If anyone could tell me if I am correct that would be great.
*June 1, 2015*

**First Nations Studies 12 **

Activity Sheet 5-10. Analysis: Louis Riel's summation to the Jury speech. Please someone help me with these questions if you can please!! I REALLY NEED THE HELP!!!??? What information is left out of his speech? What other sources of information could you use for comparison...
*May 25, 2015*

**math **

Mary wants to build a fence in the yard to keep her dog from running away. She only has 60 feet of fencing. If she wants to create a rectangular space that has a length that is twice as long as the width. How long is each side of the rectangular space?
*May 17, 2015*

**Math**

Hi! I know I am asking a lot since this is a huge question, but I was wondering if anyone could help or walk me through it. I totally understand if you do not want to help. But I am really confused and any help at all would be amazing. Thank you! You are writing an article on ...
*May 14, 2015*

**Chemistry**

a. You are going from 3 moles of gas to 2 moles of gas and 3 moles of solid. So, you are decreasing the number of moles of gas particles, so the entropy would decrease, giving a ΔS < 0. b. Here, you're going from 2 moles of gas to 3, so ΔS would probably be ...
*May 14, 2015*

**Math**

My answer is A. Is that correct?
*April 29, 2015*

**Math**

1) Which sum best represents the model shown below? There are 3 blue blocks, and each of them separately equal x^2. There are 2 green blocks that each separately equal x. There are 2 red blocks that each separately equal -1. And there is 1 yellow block that equals 1. A) 3x^2+...
*April 29, 2015*

**Math**

1) Which expression represents the perimeter of the triangle drawn below? The triangle has (x-1) on the left side. (x+2) is on the bottom of the triangle. (2x-4) is on the slanted top. A) 3x-3 B) 3x-5 C) 4x-3 D) 4x-5 I do not know how to do this, so help would mean so much to ...
*April 29, 2015*

**math **

if $6000 is invested at 3% compounded quarterly, what is the amount after 6yrs?
*April 28, 2015*

**College Algebra**

So the maximum area is the vertex? Is the vertex 200, 1000? And the dimensions in order to maximize the area enclosed are 200, 125?
*April 27, 2015*

**College Algebra**

A rectangular enclosure is to be constructed with 2,000 feet of fence in order to have four sections, as in the diagram below. What should be the dimensions in order to maximize the area enclosed? What is the maximum area? (So the diagram is just four rectangles connected side...
*April 27, 2015*

**Inequalities Interval Notation**

Solve: (2 + x)(5 + x)(4 - x) < 0 (write answer in interval notation) Which I think is xe (-infinity, -5) or (-2, 4) and Solve: (4x + 1)(3 - x) > or equal to 0 (write answer in interval notation) Which im unsure
*April 27, 2015*

**College Algebra**

A large hotel finds that it can rent 95 rooms when it charge $100 per room. For each $1 increase in room cost it rents one room less. (Likewise, for each $1 decrease in room cost it rents one room more) What price should it charge in order to maximize the revenue? Well, ...
*April 27, 2015*

**english**

D . is the right answer because I just took the test!
*April 15, 2015*

**science**

1) How do decomposers increase the fertility of soil? A) By storing moisture in the soil. B) By breaking down and digesting the remains of dead organisms. C) By making spaces for air and water. D) By burrowing deep below topsoil. I am thinking is is either B or D, but I do not...
*March 23, 2015*

**Physics Honors**

A 47.0 g golf ball is driven from the tee with an initial speed of 48.0 m/s and rises to a height of 23.2 m. (a) Neglect air resistance and determine the kinetic energy of the ball at its highest point. (b) What is its speed when it is 8.0 m below its highest point?
*February 13, 2015*

**Physics Honors**

A basketball player makes a jump shot. The 0.600-kg ball is released at a height of 1.90 m above the floor with a speed of 7.40 m/s. The ball goes through the net 3.10 m above the floor at a speed of 4.40 m/s. What is the work done on the ball by air resistance, a ...
*February 13, 2015*

**GEO**

C. stopping French nuclear testing in the region. Just took the test!
*February 2, 2015*

**Physics**

A pond is 12 metres across. The crests of two successive waves are 60.0 cm apart and they each move across the pond in 15 seconds. a)What is the velocity of the waves? b)What is the frequency of the waves? c)What is the period of the waves?
*November 23, 2014*

**chemistry**

What is w when 3.37 kg of H2O(l), initially at 25.0oC, is converted into water vapour at 111oC against a constant external pressure of 1.00 atm? Assume that the vapour behaves ideally and that the density of liquid water is 1.00 g/mL. (Remember to include a "+" or &...
*November 3, 2014*

**chemistry**

The enthalpy change for the reaction below at 25oC is -2,252 kJ (per mole of C11H24). What is the internal energy change for the reaction at 25oC? 11 CO(g) + 23 H2(g) --> C11H24(l) + 11 H2O(l)
*November 3, 2014*

**chemistry**

A 0.009298-mol sample of an organic compound was burned in oxygen in a bomb calorimeter. The temperature of the calorimeter increased from 23.7oC to 27.1oC. If the heat capacity of the calorimeter is 4.84 kJ (oC)-1, then what is the constant volume heat of combustion of this ...
*November 3, 2014*

**PHYSICS**

Use dimensional analysis to determine the pressure, P, in the pipe to within a dimen- sionless multiplicative constant of order 1.(Hint: P may depend on another physical variable besides A and R.) Using your result from part (a), reexpress your answer in a form that involves v...
*September 21, 2014*

**physics**

Use the formula F=kQ1Q2/r^2. Q1+Q2=200*10^-6 C 200*10^-6 C - Q1=Q2 substitute Q2 into the top formula and solve the equation.
*September 1, 2014*

**Physics-half way fin.**

A person was shot vertically upward from a cannon with a mass 52 kg and a speed of 35 m/s. a) what was the height according to conservation of energy and b) what was the person's total energy? (TME never changes!) a) used TMEo=TMEf height= 63 m. b.)Would I use PE=mgh
*June 21, 2014*

**Physics-check plz**

If a pitcher throws a fast ball with a speed of 35 m/s. The ball has a mass of 220 grams. a) how much work was done in throwing the ball? b) If the catcher catches the ball by moving his mitt 15 cm. backward what force did he exert? a.) Throwing the ball in a positive ...
*June 20, 2014*

**AlgebraII( Probability)**

1)a number less than 35 is chosen. 2)A prime number is chosen. 3) A multiple of 4 is chosen. 4)A perfect cube is chosen. Please help me.
*April 27, 2014*

**Electricity**

Refrigerators requires a lot of electricity and uses the most electrical energy in most households. Why do refrigerators require so much energy to be operated?
*April 8, 2014*

**Computers**

jghhgfi
*March 17, 2014*

**Personal Dimensions of Education**

THE ANSWER IS "IS"
*February 16, 2014*

**Math **

Grace painted 1/3 of the wall. Sarah painted 2/5 of the wall. How much of the wall have grace and sarah painted ?
*January 23, 2014*

**geography**

d. Singapore is a major manufacturer of computer hard drives. Just took the test.
*January 20, 2014*

**Algebra 2**

Ans: a. the matrix will have the same signs of the coefficients of the equations.
*January 9, 2014*

**arithmetic sequences**

the initial game costs 50 cents. ANS= 50 + 25x = 50 + 25(9) = $2.75
*January 9, 2014*

**physical science**

45mph*5280ft/mi*1m/3.2808ft*1hr/3600s speed limit= 20.12 m/s the speed limit is less than the speed of the car. yes, the car exceeded the speed limit.
*January 9, 2014*

**Anyone please help(math)**

Question 1: ANS: a. 7 Question 2: ANS: a. 4 Question 3: ANS: d. 3
*January 9, 2014*

**Early Childhood Education**

b. fit into natural daily routines.
*November 16, 2013*

**Early Childhood Education**

When designing IFSP objectives, its useful to parents to think of skills that a. are short and easy. b. fit into natural daily routines. c. are most useful in promoting ambulation. d. are taught in isolation to maximize chances of progress.
*November 16, 2013*

**math**

1. The world population in 1992 is 5.42 billion. If its population doubled every a. 41 years, what would its population be in 41 years? b. 41 years, what would its population be in 82 years? c. 82 years, what would its population be in 164 years?
*November 12, 2013*

**math**

i got that but i was not sure about b)b. How long do you have before you must act or have your pond covered with the plants?
*November 12, 2013*

**math**

The area covered by water lilies in a pond you own doubles in size every day. If allowed to grow the plants would cover the entire pond surface in 30 days. You had decided to do nothing until the pond is ½ covered. a. On what day will the pond be ½ covered? b. ...
*November 12, 2013*

**english-satire**

so i am doing a satirical essay , similar to that of swift's modest proposal.I want to talk about obesity, and i have an idea of showing it in a positive way, as in some nations in the past and present being chubby/fat is seen as prosperity and success.What kind of ...
*October 29, 2013*

**sciencee!**

What natural zone are each of these cities or areas in? Los Angeles, Palm Springs, Santa Monica Mountains, Catalina, San Francisco, Yosemite --choices are-sierra transitional zone, humid transitional zone,upper sonoran, lower snoran, redwood belt, grasslands,and mountains
*October 20, 2013*

**science.please help!**

Would you expect to find the humid transitional zones on the coast or inland? Northern or Southern part of California?
*October 20, 2013*

**Environmental Science**

Would you expect to find the humid transitional zones on the coast or inland? Northern or Southern part of California?
*October 20, 2013*

**Physical Science**

36.5 lbs
*October 15, 2013*

**Physical science**

Vf=Vi+gt Vf= final velocity (what we're solving for) Vi= initial velocity (in our problem, initial velocity is zero because the rock starts from rest) g=gravitational acceleration (9.8m/s/s) t= time (in our case, 3.5s) Vf= 0m/s + (9.8m/s/s)(3.5s) Vf= 34.3m/s downward (you ...
*October 8, 2013*

**Early Childhood Education**

Which of the following should not account for rapid gain in overall brain size after birth. a. number of neurons b.swelling due to rapid muscle growth c. The growth of dendrite trees d. myelinization I chose answer a.
*September 21, 2013*

**Early Childhood Education**

A needs and services plan is a. written by a pediatrician b. only for infants and toddlers with special needs c.a plan discussed by parents and caregivers upon entry into an infant-toddler program d. a formal plan to serve children that is made by the program and a regulating ...
*September 21, 2013*

**chemistry **

A 20.9 g sample of nitrogen gas combines completely with 4.5 g of hydrogen gas to form ammonia. What is the mass of ammonia formed? A 12.7 g sample of X combines with a 24.4 g sample of Y to form the compound XY2. What is the mass of the reactants?
*September 15, 2013*

**math**

thank you so much steve
*August 25, 2013*

**math**

K is the midpoint of JL JL=4x-2 and JK=7. find x, KL, and JL. Very confused , can you please show steps to working out the problem
*August 25, 2013*

**algebra 2**

A rubber ball is thrown 20 feet into the air. If it rebounds 3/5 of the height, how far will it have traveled after the fifth bounce?
*May 10, 2013*

**CONFUSING QUESTION PLEASE HELP**

SN
*May 9, 2013*

**Spanish**

1: él está jugando a las cartas. 2: Mis amigos juegan fútbol. 3: Tienen prisa 4:Toco la guitara
*May 9, 2013*

**Science**

How a lack of nutrients in the soil can affect plant growth?
*May 6, 2013*

**Science**

No, liquid manure.
*May 6, 2013*

**calculus**

find the derivative of the following: 3x^2 ln(2x) e^2x ln√x+3 please try and show few steps and laws of logarithmics.
*April 13, 2013*

**Biology**

Consider this pathway: signaling ligand ¨ G protein-coupled receptor ¨ G protein ¨ adenylyl cyclase ¨ cAMP. Identify the second messenger. Answer: A)G protein B)GTP C)adenylyl cyclase D)cAMP
*April 12, 2013*

**Calculus**

Use the Evaluation Theorem to find the exact value of the integral ç^6 2 2x+1dx 1) What is the antiderivative? 2)What is theupper and lower limit? 3) Give final answer.
*April 12, 2013*

**Algebra**

Mickey went to Donald Dee's to buy 75 milkshakes for his party. Each milkshake cost the same integer amount of cents. In total, Mickey spent at least $124.00 on milkshakes. What is the smallest possible cost (in cents) of a milkshake?
*April 11, 2013*

**Algebra**

Raj and Vikram are two travelers in ancient India, walking along the Silk road. On the first day of travel, Raj travels 5 yojanas, and on each successive day travels 3 yojanas more than the previous day. Vikram started at the same place and travels the same path, but started 5...
*April 11, 2013*

**calculus optimization problem**

by cutting away identical squares from each corner of a rectangular piece of cardboard and folding up the resulting flaps, an open box may be made. if the cardboard is 30 inches long and 14 inches wide find the dimensions of the box that will yield the maximum volume.
*April 3, 2013*