Tuesday

August 30, 2016
Number of results: 67,991

**biology**

Mutant C: Suppose an A/T base pair was inserted in between the two G/C base pairs at positions 18 and 19, marked by the letters above and below the strands. What would the amino acid sequence of the resulting protein be? Be sure to enter the sequence N- to -C from left to ...
*November 18, 2013 by juanpro*

**Calculus**

[Exponential growth & decay] The half-life of radioactive strontium-90 is approximately 29 years. In 1965, radioactive strontium-90 was released into the atmosphere during testing of nuclear weapons, and was absorbed into people's bones. How many years does it take until only ...
*October 6, 2009 by Z32*

**calculus**

An open box is to be made from a flat piece of material 18 inches long and 5 inches wide by cutting equal squares of length xfrom the corners and folding up the sides. Write the volume Vof the box as a function of x. Leave it as a product of factors, do not multiply out the ...
*April 14, 2010 by Julie*

**AP Calculus AB (Algebra Review)**

Show that if |x + 3| < 1/2, then |4x + 13| < 3. I have no idea how to do this. I thought I might have to use the triangle inequality thing but that got me no where for the first equation I got a soultion of (-7/2, -5/2) and for the second soultion i got (-4, -5/2) I ...
*May 22, 2010 by Susan*

**calculus**

The chemistry teacher at Stevenson High School is ordering equipment for the laboratory. She wants to order sets of five weights totaling 121 grams for each lab station. Students will need to be able to weigh every integral weight from 1 to 121 grams using these weights and a ...
*April 26, 2012 by Amy*

**Calculus II**

Fed loves polynomials with rational coefficients and only such polynomials.Suppose f(x)=square root of x. Find a polynomial P(x) that Fred will adore so that, for any x in the interval [3,5], the difference between P(x) and f(x) is less than .01 Hint: The interval is [3,5]. ...
*October 17, 2012 by Lauren*

**Calculus (Please Check)**

Show that the equation x^5+x+1 = 0 has exactly one real root. Name the theorems you use to prove it. I.V.T. *f(x) is continuous *Lim x-> inf x^5+x+1 = inf >0 *Lim x-> -inf x^5+x+1 = -inf <0 Rolles *f(c)=f(d)=0 *f(x) is coninuous *f(x) is differentiable f'(x) = 5x^4...
*October 18, 2012 by Anonymous*

**Calculus and vectors**

A cylindrical tank is to have a capacity of 1000 m³. It is to fit into a foundry that is 12 m wide with a height of 11 m. The base of the tank will cost half as much as the top. The metal for the side of the tank will cost four fifths as much as the top. An equation that can ...
*January 22, 2014 by Annie*

**Trigonometry**

Three oil platforms, Alpha, Beta and Gamma are situated in the North Sea.Beta is 12 km from Alpha and is on a bearing of 145 degrees from Alpha.Gamma is 16 km from Alpha and is on a bearing of 220 degrees from Alpha.Find the distance of Beta from Gamma. (Not sure how to ...
*March 9, 2015 by Lucina*

**Operations Management **

Setup Times Read the case study below “Hi-Ho Yo-Yo, Inc.”. Write a short summary of each of the four methods for selecting the order in which to release the products to printing. Complete a short analysis for each method which provides the average flow time and average ...
*July 18, 2011 by Gabe *

**Pre-Calculus**

Find the twelfth term of the geometric sequence: 1/16, 1/8, 1/4.... Common ratio: 1/2 I got the ratio by dividing 1/16 by 1/8 which gave me 1/2 and I divided 1/8 by 1/4 to get 1/2-----That is how I got a common ratio of 1/2. In order to obtain the 12th term I think I messed up...
*September 16, 2008 by Lucy*

**calculus/Trig**

Suppose you wish to express sin(3t) in terms of sint and cost. Apply the sum formula to sin(3t) = sin(t+2t) to obtain an expression that contains sin(2t)=sin(t+t) and cos(2t)=cos(t+t). Apply the sum formulas to those two expressions. Enter the resulting expression for sin(3t) ...
*May 23, 2010 by John*

**calculus**

A company manufactures and sells x cellphones per week. The weekly price-demand and cost equations are given below P=400-.5x and C(x)=20000+130x What price should the company charge for the phones and how many phones should be produced to maximize the weekly revenue. What is ...
*June 26, 2012 by Harold*

**calculus**

If the hands on a clocktower's clock are 2ft and 3ft long, how fast is the distance between the tips of the hands of the clock changing at 9:20? I know that the derivative of the minute hand is pi/30 rad/min and derivative of the hour hand is pi/360 rad/min. what is the ...
*November 11, 2012 by nico*

**Calculus-Function**

sketch the graph of a function in neighborhood x=2 that satisfies these conditions f(2)=3 f'(2)=2 f"(2)=-1 you can find a specific function that satisfies all of the given conditions i know the first derivative gives you critical points, and second derivative gives you points ...
*April 29, 2013 by Liliana*

**Calculus**

There are 50 apple trees in an orchard, and each tree produces an average of 200 apples each year. For each additional tree planted within the orchard, the average number of apples produced drops by 5. What is the optimal number of trees to plant in the orchard? I mostly need ...
*March 25, 2014 by Q*

**Calculus**

Two full 48-gallon tanks begin draining at t = 0. Tank Alpha's volume is changing at a constant rate of -16/5 gal/min. The rate at which Tank Bravo's volume is changing is given by r(t)=-1/3t-1 gal/min. a) How much water is in each tank after 5 minutes? b) Which tub drains rst...
*April 7, 2014 by Tyler*

**Calculus Help and Check**

1)Find the most general antiderivative of the function. (Check your answer by differentiation. Use C for the constant of the antiderivative. Remember to use ln |u| where appropriate.) f(x) = (1/5)−(3/x) -----> (x/5)-3lnx+C 2)Find f. f ''(x) = 4 + 6x + 36x^2, f(0...
*April 18, 2014 by Kimberly :(*

**Grammar and Composition**

1. John and Nicole washes the dishes a. sentence structure is correct b. "Washes" should be changed to "wash" in order to make the subject and verb agree c. a verb usually agrees with its subject in number d. sentence needs a helping verb B 2. A kitten or a puppy make a good ...
*October 16, 2009 by y912f*

**Biology for school**

What is the effect of substrate concentration on enzyme activity? How does enzyme activity change as substrate concentration decreases? Explain on a molecular basis. I am not sure what the question wants from me. Would this be right, and is there anything missing from my ...
*February 27, 2008 by Huckabee*

**physics help me please!**

A certain wave is incident on an interface at an angle of 40 deg. The wave emerges into the other material at an angle of 30 deg. Crossing the interface, the wave: a. increased speed b. reduced speed c. maintained constant d. more info is needed I think reduces its speed, but ...
*November 30, 2010 by Amber*

**Spanish- SraJMcGin please recheck**

I'm not sure what you meant by correcting this sentence--Thank you for any further explanation you can give-- 3. Tocar el piano es______tocar la guitarra. (+bueno) Tocar el piano es mejor que tocar la guitarra. You said in an earlier post: mejor que(irregular - or comparative ...
*November 2, 2011 by Allie*

**Chemistry**

The decomposition of ozone may occur through the two-step mechanism shown below: step 1 O3 ----> O2 + O step 2 O3 + O ---> 2O2 The oxygen atom is considered to be: a catalyst or reaction intermediate? How am I supposed to be able to tell the difference between the two? I...
*February 19, 2013 by Marcus *

**Biology**

Does it matter which strand is the 'code strand'? The following two sequences look identical, except one runs 3'-5' and the other 5'-3'. For each DNA sequence given below, write the mRNA sequence that would be coded from it. Make sure you indicate the direction of each mRNA ...
*March 22, 2014 by Danielle*

**Calculus**

I have a project and part of it has to do with revenue, demand and profit. I know that Revenue=price x quantity but can profit equal price x quantity demanded? I have both written down and I am getting confused because I was supposed to find the profit but I have the revenue ...
*October 14, 2007 by Dan*

**calculus**

A moving dot P departs from O at an initial speed of 6 m/s in the east direction and accelerates at 2 m/s^2 in the east direction. 2 seconds after P's departure, dot Q departs from O to chase down P at a constant speed of k m/s in the east direction. What is the minimum speed...
*March 21, 2013 by rohit*

**Calculus**

Linda has $9000 to invest. She invested x dollars in an account that earned 3% simple interest and the remainder of the money in an account that earned 2.6% simple interest. In one year, both accounts together earned $250 interest. How much was invested in each account?
*February 5, 2015 by Q*

**Calculus**

Use Newton's Method to approximate the root of the function f(x)=e^x-5x when the intial point chosene is x1=1.5. Do two iterations. This is what I did, but not working. f'(x)=e^x-5 x2=1.5 - (e^1.5-(5(1.5))/e^1.5 -(5)) =1.5-(4.4817-7.5/4.4817-5)=1.5-5.8234= -4.3234 x3=-4.3234-(...
*April 17, 2011 by Janet*

**chemisttry**

Is the molecular geometry around the carbon atom(s) trans-1,2 difluroethylene a trigonal planar? I'm pretty sure it is, but I just need to varify it, if it is not a trigonal planar what is the molecular geometry around the carbon atom(s)?
*May 28, 2008 by Tom*

**English 10**

My aspiration to become a famous astronomer propels me to exceed in all of my classes. Identify the appositive or appositive phrase. - to exceed - aspiration - to become a famous astronomer - classes I am thinking its B. but not 100% sure...
*November 18, 2014 by Smithy*

**Algebra 1- Please help whenever you get the chance**

2. What is the slope of the line that passes through the pair of points? (7,2) and (9,6) a. -1 b. -2 c. 1 d. 2 I think it's d 3. What is the slope of the line that passes through the pair of points? (3,-4) and (6,-9) a. 5/3 b. -5/3 c. 3/5 d. -3/5 i think it's a I'm not 100% ...
*December 1, 2015 by basketball&batman*

**english**

my writing is not very nice and neat should i practice more Here is what you can do: Start a Journal (blank book), writing on alternate pages. Write in it every day. Weekly, give it to a trusted friend (mom, aunt, friend) who can take the journal and mark up errors. Rewrite ...
*May 8, 2007 by sophie*

**chemistry**

ideal gas .450 mole initial pressure 16 atm and 290 K expands isothermally to a final pressure 1 atm. find work , if expansion is against a vacuum, a constant external pressure of 1 atm and reviersibly
*February 1, 2009 by kat*

**Home work for Gym**

To join a gym, your friend pays a one-time fee of $75 and $45 per month for the duration of the membership. Your friend has paid a total of $345. How long has your friend been a member of the gym? HELP ME1 :D
*October 7, 2010 by Jessica*

**chemistry**

2CO2(G)--->2CO(g)+O2(g), deltaH=566kj what is Kc and state whether the reaction favors products or reactants? A.)[CO2]=1.5M, [CO]=1.2M, [O2]=0.05M B.)[CO2]=8.3M, [CO]=0.05M, [O2]=0.50M C.)[CO2]=0.05M, [CO]=0.75M, [O2]=0.07M any work would be much appreciated!!!thank you
*March 2, 2012 by Mckayla*

**calculus**

find dy/dx y=ln (secx + tanx) Let u= secx + tan x dy/dx= 1/u * du/dx now, put the derivative of d secx/dx + dtanx/dx in. You may have some challenging algebra to simplify it. Use the chain rule. Let y(u) = ln u u(x) = sec x + tan x dy/dx = dy/du*du/dx dy/du = 1/u = 1/(sec x + ...
*March 9, 2007 by amy*

**Geography**

Need help with these 2- 15. The six climate regions into which geographers have divided the earth are defined mainly by a. latitude and elevation b. temperature and precipitation c. atmospheric pressure d. location and landforms I'm not sure but I think it might be B or D 16. ...
*August 25, 2009 by mysterychicken*

**Language Arts**

Identify the sentence with the independent clause underlined. A. Because she wanted to win, Lanie practiced hard every day. B. Although Cale is fairly sure about the next move, the team decides to follow Manny’s suggestion and go for the touchdown. C. Although he was first to ...
*March 15, 2013 by Cassie*

**written communication**

Can anyone help me respond to the following: the local bank made a mistake on your printed checks. Additionally, the bank charged you for the checksm even though the order was suppose to be complimentary for customers opening a new account. How can I draft a letter that allows...
*September 12, 2007 by Ms. M*

**Health**

I have to do a 1 page essay on "Protecting yourself in Public". Now, our teacher just gives us work, she doesn't lecture us. Also I think it is due tomorrow (at least that's what my friend told me), and she assigned it today. So I tried looking on Google and I can't find ...
*December 6, 2007 by Wenmar*

**dr bob science**

Thanks can you check one more If it takes 105 calories to warm 100g of aluminium from 20oC to 25oC, what is the specific heat of aluminium? Q = MxdeltaTxC 105cal = 100gx (5oC) x C C = .21 cal/gCo we get points off if we do not show our work and just give the answer
*April 25, 2008 by sam*

**religious education - Re teachers**

I need to write an essay about baptism in different churches. please could someone help find a website that explains it simply. I was off school sick after having an operation when we did most of the work and missed alot of the information I need. thankyou for helping
*March 14, 2009 by kyla*

**Chemistry**

I havent been at school for 8 days due to somthing wrong with my heart, but the teachers gave me work. I have no clue how to do them. I really need help please, There all due tomarrow. Determine the pressure inside a televison picture tube with a volume of 3.5L that contains 2...
*April 5, 2010 by Help please*

**Psychology**

Write a 200-300 word response, considering how employers and fellow team members might use this instrument at work. Is this test reliable?Is it valid? What are the potential benefits and drawbacks of a test that attemps to measure skills, abilities, or traits. Can someone ...
*August 30, 2010 by Ashley*

**Civics**

Which of the following was NOT a reason why a stronger central government was needed? To solve the economic problems of the United States =To limit individual liberties To deal with military matters both internal and external To make the States work together as a single ...
*February 14, 2012 by Sierra*

**Economics**

We created a new iPod for a scarcity project, and we can't come up with a slogan to save our lives. Help? Some of the features are picking songs based on your mood( like a mood ring) and being able to work through homework problems. It would be amazing, huh? Please help!
*January 10, 2013 by Chelsea*

**math**

Your teacher asked the class to describe a real-work situation in which the y intercept is 100 and the slope is 5. Your pattern gave the following description. My younger brother originally had 100 small building blocks, but he has lost 5 of them every month since. What ...
*November 3, 2014 by Mika*

**Math**

Hello again, today is my final day of the semester and I started late. So I have tons of work to quickly finish and this math test I am taking is 48 questions. Just a brief description why you might see my name a lot. 1. Which is a solution of the equation y=4x+3? A.(5,17) B.(...
*January 26, 2015 by Tia*

**Language Arts**

1. which question should you ask during your secaond read of the multi-draft reading process A how has this work increased my knowledge of a subject, author, or genre <--this one B How does the speaker feel about the topic C How does the poet's word choice create vivid ...
*January 28, 2016 by DEEZ GOT HEE*

**English**

Through her work at the center for the family in transition, Wallerstein has come to see divorce not as a single circumscribed event but as ___ of changing family relationships as a process that begins during the failing marriage and extends over many years. A) a continuum B) ...
*February 25, 2016 by Jina*

**science**

The somatic cells of a dog contain 78 chromosomes. Which of these is false? a) the diploid number is 78 b)the haploid number is 39 c) sperm produced by a dog contains 39 chromosomes d) a cell in metaphase of mitosis contains 78 chromosomes e) a cell in metaphase II of meiosis ...
*February 22, 2012 by Rebecca*

**Math**

5. Which of the following statements is NOT true regarding an expression written in scientific notation in the form of a x 10^n ? A.)The value of "A" must be greater than or equal to 1 and smaller than 10. B.)The value of "N" must be an integer. C.)Doubling "N" results in a ...
*January 9, 2013 by Deborah*

**sentence structure**

need help making sure how to write this sentence. I will not be ashamed of my Lord and Savior, Jesus Christ. I will not be ashamed of my Lord and Savior Jesus Christ.
*August 17, 2010 by Amy*

**chem**

what are the strong acids and what is a good way to remember them what are the strong bases and what is a good way to remember them I think but am not sure: are the weak acids and bases everything else?
*November 20, 2011 by anonymous*

**Physics**

1) Which components remain constant throughout the motion? vx = x component of the velocity vy = y component of the velocity ax = x component of the acceleration ay = y component of the acceleration I know that ax and ay remain constant but I am not sure about vx and vy.
*May 22, 2012 by Hannah*

**Algebra Help**

You are going to write a fairy tale! Your story should include all of the standard elements of fairy tales. Begins “Once upon a time … ” Animals can act like humans. Involves magical items or helpers. Ends “ … happily ever after.” Your story must also fully cover these math ...
*January 15, 2015 by Dina*

**Economics**

Multiple Choice: Products with a positive income elasticity greater than one are: a)dying products b)normal goods c)luxury goods d)inferior goods Take a shot. Be sure to research the concepts of normal, inferior, and luxury goods. (hint: "dying products" are right out)
*October 25, 2006 by Yellow Bird*

**Chem**

Change in enthalpy problem. Consider the reaction represented below. Referring to the data in the table below, calculate the standard enthalpy change for the reaction at 25 degrees C. O3(g)+NO(g)-->O2(g)+NO2(g) Standard enthalpy of formation in kJ/mol: O3(g) 143 NO(g) 90 ...
*November 19, 2007 by Dan*

**English**

Which of the following is a complex sentence that contains a dependent adverbial clause? 1) Mark expects the photo to arrive on Tuesday. 2)Marks expects the photo to arrive late. 3) Mark expects the photo to arrive in damaged condition. 4) Mark expects the photo to arrive when...
*December 3, 2007 by Maya*

**Physics**

Car A and B are passing each other in different lanes. Car A has an initial speed of 15m/s and is gaining speed at 1.5m/s^2. Car B has an initial speed of 20m/s and is gaining speed at 2.0m/s^2. Find when and where the cars will pass one another and their speeds as they are ...
*February 20, 2008 by Anonymous*

**geometry**

State whether the following numbers make a right triangle and a Pythagorean triple: 2, 2 root 2, and 2 root 3 I am pretty sure that both answers are no, because 2 squared and 2 root 2 squared equal 8, whereas 2 root 3 squared equals 6, so it cannot form a right triangle or ...
*April 4, 2015 by Morgan*

**Chemistry**

Consider this reaction: 3 K2CO3 (aq) + 2 CrCl3 (aq) -> Cr2(CO3)3 (s) + 6 KCl (aq) If 1.2 moles of CrCl3 react, how many moles of K2CO3 will react with it? A. 0.80 mol K2CO3 B. 1.2 mol K2CO3 C. 1.8 mol K2CO3 D. 2.4 mol K2CO3 I'm not sure where to even begin, I know how to ...
*April 11, 2015 by Mischa*

**Math Help!**

Solve each problem. 1. two-thirds equals twelve over x x = 18 x = 12 x = 36 x = 8 2. six-elevenths equals eighty-four over x x = 40 x = 120 x = 254 x = 154 3. twenty-two miles over fifty-five hours equals twelve miles over h hours 48 30 45 22 Not sure please help me?
*January 13, 2016 by Amber*

**Maths (Calculus)**

The motion of a particle performing damped oscillations is given by the formula y = e-t sin2t Where y - displacement from its mean position and t - time in seconds (a)determine the time at which the velocity of the particle is 0 (b)Determine if the displacement of the particle...
*May 9, 2013 by dylan james*

**Predication**

I do I correct the prediaction sentences below? Our resolutions should begin at midnight on January 1. The reason for the cat’s illness is because she was allergic to the dog. A book that has an exciting introduction and a surprising ending would be the best story for me to ...
*November 16, 2007 by Samantha*

**history**

Which of the following statements about the provisions of the Compromise of 1850 is true? [ A. Fugitive slaves were denied any and all constitutional rights.] B. The New Mexico Territory was absorbed into Texas. C. The principle of popular sovereignty was abandoned. D. The ...
*December 2, 2011 by jake*

**Psycholofgy**

Please help! Is this the correct answer. I choose A Roles contribute to the streamlining of everyday interactions because they a. permit us to make fundamental attributions in social situations. b. allow us to anticipate the actions of others. c. frequently put us in positions...
*December 12, 2011 by Keller*

**Grammar**

Which sentence demonstrates correct use of modifiers? A) Startled by the noise, the alarm clock was knocked on the floor. B) Kendah found a broken glass washing her dishes. C) Rocco gave snacks to his friends in plastic bags D)Standing on a chair, I was just able to reach the ...
*December 7, 2013 by JCRanch*

**English**

Using the correct indefinite pronouns These are what I think the answers are in parenthesis. Never judge anyone entirely by (his or her) looks. Each one has a right to (his or her) own opinion in this matter. Some man has left (his) raincoat. Has each student received (his or ...
*February 26, 2014 by Anonymous*

**ENG1511 ENGLISH**

Good Day, Please help Correct the following sentences for subject verb-agreement, tense or fragment. When he thought he could afford to pay his own school fees. Going home now, how I wish I could get there before it starts to rain. I am writing my homework after every class
*July 21, 2014 by JADE*

**English**

1) As a receptionist at the office, I catered to clients' needs and provided administrative support, including drafting reports and archiving data. 2) I believe that my analytical research and writing expertise, laboratory experience, and communication skills make me an ...
*December 17, 2015 by ann*

**Technology **

Correct me if I'm wrong!! Ken Has Dipped Many Dark Chocolate Marshmallows (which helps you remember the metric system distance units in decreasing order: Kilometer, Hectometer, Decameter, Meter, Decimeter, Centimeter, Millimeter) is an example of which type of mnemonic? A. ...
*January 28, 2016 by Vanessa*

**science --- pls check my work!!!**

hi, pls check my work asap! 1. A ___ has a definite shape and a definite volume. (1 point) solid*** liquid gas molecule 2. Why is a gas able to flow? (1 point) Its particles have melted and can move around.Its particles have high viscosity and can move around. Its particles ...
*February 8, 2014 by TTR+S<3*

**History**

Sonya writes an essay about children in the early 1800s: Children in the early 1800s faced a lot of hard work. They usually had to help their families with household chores. These chores included gardening, sewing, and caring for other children. When their parents got sick, ...
*January 8, 2016 by Aaliyah*

**Calculus**

My question is finding the derivitive of y=((x+λ)^4)/(x^4+λ^4). I distributed the exponent in the numerator, but I don't know if that's right. Rewritten as y=(x^4+λ^4)/(x^4+λ^4). I found the derivitive and multiplied accordingly, as ((4x^3+4λ^3)(x^4+&#...
*July 15, 2015 by Jessica*

**Math**

5. The following random sample was selected : 4, 6, 3, 5, 9, 3. Find the 95% confidence interval for the mean of the population. 6. In a sample of 35 high school seniors, 14 of them are attending college in the fall. Find the 95% confidence interval for the true proportion of ...
*May 9, 2013 by Anonymous*

**Chem+ASAP+2 fill in the blank questions+ASAP!!!**

PLease check this. They are fill in the blank and I just need to know if they are right. Thanks! 9. Compared to a strong acid-strong base titration curve, a weak acid-strong base titration curve has a (higher, lower) __higher___ initial pH value. 10. Compared to a strong acid...
*August 8, 2006 by David*

**Chemistry**

Which of the following has the greatest entropy? A.1 mole NaCl (g) at 25C B.1 mole NaCl (g) at 50C C.1 mole NaCl (l) at 50C D.1 mole NaCl (s) at 100C I know that gases have the highest entropy and the higher the temperature the higher the entropy...so i am leaning toward b. ...
*November 15, 2009 by Christina*

**Algebra **

I have two problems that I need some help with. I believe I got to the answer but not quite sure if its right. I need to expand and evaluate each series. 1. There is an E like symbol that has a 7 at the top. On the bottom k=1 and on the right side (-1)^k K 2. There is an E ...
*April 1, 2013 by John*

**physics**

Student wants to jump from their 3rd floor apartment window to the swimming pool below. The base of the apartment is 8.00 meters from the pool’s edge. If the window is 20.0 meters high, how fast does the student have to be running horizontally to make sure they make it to the ...
*September 27, 2014 by Iworlock*

**Music**

1). What aspects of music do most people understand and appreciate about music? I.e., what do they remember about a piece – the melody, the rhythm, the harmony, the timbre, a combination of these? -I think the answer is melody but I'm not sure 2). If a music composer does not ...
*May 19, 2016 by Cara*

**Chemistry**

In an experiment we did in class ethanol was poured into a test tube and we noticed that the ethanol did not collect and form a dome at the opening of the tube in the same way that water had. I know why water collected at the opening, but i'm not sure why the ethanol didn't ...
*March 22, 2011 by cassandra*

**Chemistry**

Barium sulfate forms as a precipitate in the following reaction: Ba(NO3)2 (aq) + Na2SO4 (aq) -> BaSO4 (s) + 2NaNo3 (aq) When 35.0g of Ba(nO3)s is reacted with excess Na2SO4, 29.8g of BaSO4 is recovered by the chemist. a) Calculate the theoretical yield of BaSO4. b) ...
*April 26, 2011 by Anonymous*

**satp conditions**

Calcium hydride reacts with a vast excess of water to form calcium hydroxide and hydrogen gas. (See the periodic table.) (a) Write a balanced chemical equation for the reaction. (Use the lowest possible coefficients. Include states-of-matter under SATP conditions in your ...
*October 4, 2012 by rebekah*

**physics**

A 5.9 m wire with a mass of 79 g is attached to the mast of a sailboat. If the wire is given a "thunk" at one end, it takes 0.087 s for the resulting wave to reach the other end. 1. What is the tension in the wire? 2. Calculate the tension for a 89-g wire. --- I don't know how...
*December 2, 2012 by Brienne*

**math**

collect like terms 10u+5v-6u-7v -5v -5v=-2 -10u -10u =-16 answer=-18 is my answer correct
*July 21, 2009 by HELP !!!*

**Algebra**

Is this answer correct? Express as a single logarithm: log[2](6)+log[2](13) Answer= log[2](78)
*June 12, 2010 by Amy Zieg*

**English**

1. I grew 10 cm from last year. 2. I have grown 10 cm from last year. 3. I grew by 10 cm from last year. (Are they all correct?)
*June 16, 2010 by rfvv*

**English**

1. What do you have to do in an emergency? 2. What do you have to do in emergency? (Which one is correct? Are both OK? Do we have to use 'a'?)
*April 2, 2011 by rfvv*

**Grammar**

Is this correct grammar? Sarah has 6 oranges. Ted has 7 oranges. How many oranges do they have altogether?
*September 16, 2015 by Sarah*

**Pre Calculus**

a biologist has three salt solutions: some 5% solution, some 15% solution, and some 25% solution. She needs to mix some of each to get 50 liters of 20% solution. She wants to use twice as much of the 5% solution as the 15% solution. How much of each solution should she use? I'...
*June 10, 2015 by Jaden*

**office practices/ medical**

I was wondering if someone please help me with this question ? It does seem to make much sense to me. Open shelves are recommended for high-volume file rooms. Which of the following is a possible disadvantage of open-shelf files ? A increased operational effciency B less ...
*May 9, 2008 by Kiley*

**Math**

Using the TI-89 Titanium calculator: Find the largest and smallest values of each of the following functions on their given intervals. (I'll show you one) f(x) = 2^x + x^2 [-4, 1] I put in the function on the Y= screen as shown, then -4 < x < 1 (it's actually the less ...
*June 24, 2009 by Monique*

**Biology**

What is an adrenalin receptor? For a bio project at school i have to write the gene name, the # of amino acids, the # of peptides, the tissue signal, the role, the interactions, the active site/substrate, the disease/cures/inhibitors. i've googled adrenalin receptors and i ...
*October 24, 2010 by anonymous*

**physics**

An elevator with a wieght of 27.8 kN is given an upward acceleration of 1.22 m/s^2 by a cable. a) what is the tension in the cable. b) what is the tension when the elevator is declerating at the rate of 1.22m/s^2 but is still moving upwards? what exactly is a kN? to find the ...
*November 13, 2006 by Chris*

**Chem**

Question: "Calculate the theoretical yield of calcium carbonate of you react 2.55g of calcium chloride dihydrate with an excess amount of sodium carbonate." I got the molar mass of calcium chloride dihydrate which is 131.015 g/mol, but Im not sure how to start the equation for...
*October 8, 2007 by Jenna*

**chemistry (Pls Bob check for me)**

A 150mg/dl glucose solution was diluted 1:2. Then 0.5ml of it was added to 4.5ml saline. 2ml of this solution was diluted to 10ml. What is the final concentration of glucose? 1L = 10dL 1dL = 100mL My own calculation 150mg/dL = 150mg/100ml =1.5 150mg/100ml x 1/2 x 1/10 x 1/5 1....
*March 16, 2013 by Fai*

**Physics**

A not so brilliant physics students wants to jump from their 3rd floor apartment window to the swimming pool below. The problem is the base of the apartment is 8.00 meters from the pool’s edge. If the window is 20.0 meters high, how fast does the student have to be running ...
*April 12, 2015 by Carla Mae*

**physics **

Vector A has magnitude 8.0 units at an angle of 60o from the x-axis. Vector B has magnitude 6.0 at an angle of -30o from the x-axis. Find the magnitude and direction of vector C = A + B I tried actually drawing it to see if it would help but it didn't I'm pretty sure the ...
*September 19, 2015 by JOHN SMITH*

**math**

x^2 - 4 What are the: Intervals on which the graph is above the x axis Intervals on which the graph is below the x axis Intervals on which the function is increasing Intervals on which the function is increasing Im not sure how to write these intervals.. so then i can do the ...
*November 15, 2015 by Rose*