Tuesday

October 6, 2015
Total # Posts: 2,930

**Pre-Calculus**

At 34 degrees north latitude, the longest day of the year has 14.273 hours of daylight, and the shortest day 9.726 hours. If the equinox falls on march 21(day 80), model the hours of the daylight by day?
*April 28, 2015*

**Algebra **

1.0<x<1. Which must be true? I. x^9 < x^7 II.x^7+x^5 < x^6+x^4 III. x^7-x^5 < x^6-x^4 2. A football team average x points (the mean) in the first n games, scored y points in the next game, and z points in the one after that . The mean of the n+2 is A.(x+y+z) / (...
*April 28, 2015*

**linear**

Suppose that we have a system consisting of two interconnected tanks, each containing a brine solution. Tank A contains x(t) pounds of salt in 200 gallons of brine, and tank B contains y(t) pounds of salt in 300 gallons of brine. The mixture in each tank is kept uniform by ...
*April 28, 2015*

**Hallandale high**

^ excuse me bob?!
*April 28, 2015*

**Chemistry**

4.18
*April 21, 2015*

**Chemistry**

Determine the pH of a solution of 12.00 mL of 0.2 M acetic acid with 10 mL of a 0.025M NaOH? (Ka = 1.8E–5) I've calculated my excess moles of acetic to be .00215. Total volume being .022L. Where do I go from here? Thanks!
*April 21, 2015*

**math**

Use Part 1 of the Fundamental Theorem of Calculus to find the derivative of the function. g(x) = e^(3t^2) − 3t dt from 4 to x
*April 20, 2015*

**Physics**

i usually go with B if I don't know
*April 18, 2015*

**Chemistry**

Okay so in our class we did an ice cream lab where we use Ziploc bags to make ice cream. We made an ice cream mixture and then put it into a smaller Ziploc bag. Then we got a large Ziploc bag and placed ice in it and placed the bag with the ice cream mixture into the large bag...
*April 17, 2015*

**Chemistry**

If 0.605 g of magnesium hydroxide reacts with 1.00g of sulfuric acid, what is the mass of magnesium sulfate produced? Mg(OH)2(s)+H2SO4(l)→MgSO4(s)+H2O(l) .605g Mg x 1molMgSO/1molMg=.605g MgSo 1.00g MgSO/1mol H2SO4=1.00g MgSO .605g+1.00g=1.605g This is incorrect, but I ...
*April 17, 2015*

**Strategies for the Independent Learner**

your answer is so rude
*April 16, 2015*

**Strategies for the Independent Learner**

When you approach a text, you should A. survey it, using the technique called SQ3R. B. dive right in at the first page and read the assigned section. C. skip over words you don’t know. D. read only the boldface type. 2. The proctored exams for your degree courses are A. ...
*April 16, 2015*

**1 st grade**

prentend that it grandma
*April 14, 2015*

**1 st grade**

a wolf
*April 14, 2015*

**ela**

what does Little Red Riding Hood meet as she walks through the woods? What problem or conflict does this character present?
*April 14, 2015*

**1 st grade**

why does little red riding hood go for a walk in the woods?
*April 14, 2015*

**Chemistry**

I think that: Phe = remain at origin (1) Asp = migrate towards positive electrode (2) His = migrate towards negative electrode (3) Is this correct?
*April 14, 2015*

**Chemistry**

I know that the pI (isoelectric points) for each amino acid are as follows: His = pI 7.64 Asp = pI 2.98 Phe = pI 5.91 So I think that Phe will bear no net charge at 5.91 and will remain at the origin because it is at the pH where it is likely to be attracted to a positive or ...
*April 14, 2015*

**Chemistry**

The electrophoresis of a mixture of histidine (His), aspartic acid (Asp) and phenylalanine (Phe) is carried out at a pH of 5.91. Match the amino acid to its predicted behaviour under electrophoresis at that pH. 1. This amino acid will bear no net charge at pH 5.91 and so will ...
*April 14, 2015*

**Chemistry**

The electrophoresis of a mixture of histidine (His), aspartic acid (Asp) and phenylalanine (Phe) is carried out a pH of 5.91. What amino acid will This bear no net charge at pH 5.91 and so will remain at the origin, carry a net negative charge at pH 5.91 and so will migrate ...
*April 14, 2015*

**Chemistry**

An aqueous solution of a monoprotic acid is prepared. This acid is known to have a pKa of 8.6. If the acid is 37.5% ionized when in solution, what is the pH of the solution? Not really sure where to start with this question? Thanks in advance
*April 14, 2015*

**Math**

How do you write a graph to represent the function x=0,1,2,3 y= 1,4,7,10
*April 13, 2015*

**Math**

What is the funtion rule shown in the table n 3,4,5,6 y 2,1,0,-1
*April 13, 2015*

**Chemistry**

calculate oh- and ph in a solution in which dihydrogen phosphate ion is 0.335 M and hydrogen phosphate is 0.335 M. This is a homework question, where I have the solution, which is 0.335/0.335, which I get, but then I am supposed to multiply this (1)by a number 6.2x10-8? I have...
*April 9, 2015*

**algebra **

You are making a fence for your garden. The length is five less that two times the width. A.write a polynomial that represents the perimeter of the garden. B.write a polynomial that represents the area of the garden. C. Find the perimeter and area of the garden when the width ...
*April 8, 2015*

**Health P.2**

its not d i answerd d and got it wrong!
*March 26, 2015*

**math.**

I get 0.469 but i dont think it is right
*March 25, 2015*

**math.**

Kool Klothes has determined that the revenue function for selling x thousand pairs of shorts is R(x) = -5x^2 + 21x. The cost functiom C(x) = 2x + 10 is the cost of producing the shorts. A) How many pairs of shorts must the company sell in order to break even. Do i use the ...
*March 25, 2015*

**math is my answer correct**

How did you get 337.66, i still get 337.59
*March 25, 2015*

**Chemistry**

Well I'm in Chemistry that's why I put it under that :/
*March 24, 2015*

**Chemistry**

There is a picture of a brick lying face down and one standing straight up. The question asks: Is each brick exerting the same force? Explain. I know that they are exerting the same force, but I don't understand why and how to explain it?
*March 24, 2015*

**Coding**

This 23 year old female is brought into the emergency department after being found by her collage roommate. Sometimewithin the last hour and a half after th roommate left, the patient ingested her intire bottle of verapamil (estimated at over 20 pills) as a suicide attempt, ...
*March 24, 2015*

**chemistry**

whoever answered that, God bless you.
*March 22, 2015*

**chemistry**

Write a balanced chemical equation for the neutralization reaction between aqueous hydrochloric acid and aqueous calcium hydroxide. Be sure the formulas are written correctly before balancing, and include phases. HCl+H2CaO2 im not sure that's written correctly but that is ...
*March 22, 2015*

**Math**

42/6=7
*March 22, 2015*

**Chemistry**

Figured it out. I didn't know I had to put parentheses around the 1/3 when I was raising it to the 1/3 power. So I input 12.5^(1/3), and then got the correct answer. Thanks!
*March 21, 2015*

**Chemistry**

I appreciate the help, but I don't have a y^x button on my calculator, I have a TI-83 Plus. Is there an equivalent button?
*March 21, 2015*

**Chemistry**

At 500 degrees celsius, K for the formation of ammonia from nitrogen and hydrogen gases is 1.5x10-5. N2(g)+3H2(g)->/<-2NH3(g) Calculate the equilibrium partial pressure of hydrogen if the equilibrium partial pressures of ammonia and nitrogen are 0.015 atm and 1.2 atm, ...
*March 21, 2015*

**Chemistry- Electrochemistry**

Calculate the activity of KI, x, in the following electrochemical cell if the potential is +0.294 V Ag | AgCl(s),NaCl(aq,0.1) ||KI(aq, x),I (s) | Pt
*March 20, 2015*

**math**

To solve this equation first what you have to do is isolate the variable and its coefficient(3). So what you have to do is first add 6 to each side of the equation ( remember you have to do the opposite operations.) Then you would be left with 3y=26. Next what you do is divide...
*March 17, 2015*

**Math**

Thanks so much! This helped a lot
*March 17, 2015*

**Math**

Plane A leaves the airport. One hour later, Plane B leaves the same airport on the same course. It catches up to Plane A in 2.5 hours. The average speed of Plane B is 300km/h faster than Plane A. Find the speed of each plane.
*March 17, 2015*

**Chemistry **

A certain reaction has an activation energy 52.93 kJ/mol. At what kelvin temperature will the reaction proceed 8.00 times faster than it did at 315K? Ea = 52.93 kJ/mol = 52930J R (gas constant) = 8.314 T1 = 315K k1 = rate constant at T1 T2 = ? k2 = rate constant at k2 = 8.00 ...
*March 17, 2015*

**math**

2*x+y=4.82 0.5x+2y=2.29 Multiply the second equation (0.5x+2y=2.29) by 4 and take away the x. 2*x+8y=9.16 Subtract 2*x+y=4.82 from 3 7*y=4.34 y=4.34/7=0.62k The cost would be 0.62k. Hope that helps! :)
*March 17, 2015*

**calc**

At noon, ship A is 150 km west of ship B. Ship A is sailing east at 35 km/h and ship B is sailing north at 30 km/h. How fast is the distance between the ships changing at 4:00 PM?
*March 12, 2015*

**Physical science**

Two rectangular blocks are stacked on a table. The upper block has a mass of m2 and the lower mass is m1 > m2. The coefficient of kinetic friction between the lower block and the table is ųk. The coefficient of static friction between the two blocks is ųk. A ...
*March 8, 2015*

**Math**

At & T has a cell phone plan of $25.00 a month plus 30 cents per minute. There is a one year contract wit a new phone for $19.99 Can someone put this into a equation for me.
*March 7, 2015*

**Chemistry**

Light from three different lasers (A, B, and C), each with a different wavelength, was shined onto the same metal surface. Laser A produced no photoelectrons. Lasers C and B both produced photoelectrons, but the photoelectrons produced by laser C had a greater velocity than ...
*March 6, 2015*

**Chemistry**

A reaction proceeds with ∆ H = 40 kJ/mol. The energy of activation of the uncatalyzed reaction is 120 kJ/mol, whereas i t is 55 kJ/mol for the catalyzed reaction. How many times faster is the catalyzed reaction than the uncatalyzed reaction at 25°C?
*February 27, 2015*

**BioMechanics**

You have a subject (height = 150 cm, mass = 85 kg) lying prone on a moment table with their feet pressed against the foot rest. Assuming that you zeroed the scale before the subject got on the table, the scale now reads 40 kg. Where is the centre of mass (relative to the feet...
*February 21, 2015*

**Physics**

I don't get this question still! please help
*February 21, 2015*

**History**

How did Deism, the Second Great Awakening, continued denominational fragmentation, and Mormons shape American religious life?
*February 20, 2015*

**calc**

derivative of y=4^(6-x^2)
*February 18, 2015*

**pre cal 11**

thank you
*February 13, 2015*

**pre cal 11**

i am stuck at a question that is asking for the common difference, first term, and general term for the arithmetic sequence the question is t10=50 and t27=152 i found my d=6 and t1=(-4) so know my equation is: tn=(-4)+(n-1)6 i had asken my teacher to tell me what the general ...
*February 13, 2015*

**pre cal 11**

oh my god thank you i makes sense now
*February 13, 2015*

**pre cal 11**

hi so i am stuck at this question that is asking about arithmetic sequence . Five fence posts are equally spaced between two corner posts that are 42 meter apart. how far apart are the five fence posts. i know the answer is 7m but i dont know how plus i know the equation for ...
*February 13, 2015*

**linear**

If possible, solve the following linear systems by Cramer's rule. 2x1 + 4x2 + 6x3 = 14 x1 + 2x3 = 0 2x1 + 3x2 − x3 = 30 i am having trouble with this one
*February 12, 2015*

**Algebra 1**

There is a state soccer tournament with 128 teams competing for 1st place. Each week, half of the teams get eliminated. How many teams remain after 6 weeks? A. 16 B. 8 C. 4 D. 2
*February 11, 2015*

**Chemistry**

A solution of 0.200M NaOH (14.0 mL) is mixed with 42.4 mL of 0.170M HNO3. Assuming the final volume is the sum of the initial volumes, what is the molarity of Na+ cation and NO3- anion? I do not know where to start to solved for the molarity of the ions. Please help !
*February 7, 2015*

**science**

A solution of 0.200M NaOH (14.0 mL) is mixed with 42.4 mL of 0.170M HNO3. Assuming the final volume is the sum of the initial volumes, what is the molarity of Na+ cation and NO3- anion? I do not know where to start to solved for the molarity of the ions. Please help !
*February 7, 2015*

**math**

Let y = integrate from 1-9x to 1 of (u^3)/(1+u^2) What is y'? I flipped the integral so it's 1 to 1-9x and had the derivative of -9 via chain rule so -9 and just plugged in 1-9x to the (u^3)/(1+u^2) so it's -9*((1-9x)^3)/(1+(1-9x)^2). It tells me what's wrong; ...
*February 6, 2015*

**English**

Can you help me annotate this prompt? I don't know really how to do it? In the following passage from the scarlet letter the narrator describes Hester Pyrnne in her isolation from Puritan community. In a well organized essay, analyze the language and rhetorical devices the...
*February 6, 2015*

**math-urgent**

show that if A= A inverse, then det(A) = +/- 1 if A(transpose) = A(inverse), what is det(A)?
*February 5, 2015*

**Finance**

Given an interest rate of 6.25% compounded annually, how much would you accumulate if you started with $3,250 and then contributed $1,950 per year (at the end of each year) for 13 years? Is this correct? Calculate each FV and sum? PV1 = 3,250 i = 6.25% N = 13 FV = PV2 = 1,950 ...
*February 3, 2015*

**Finance**

Is this correct? Calculate the FV for each year and then sum? PV1 = 3,250 i = 6.25% N = 13 FV = PV2 = 1,950 i = 6.25% N = 12 FV = PV3 = 1,950 i = 6.25% N = 11 FV = PV4 = 1,950 i = 6.25% N = 10 FV = PV5 = 1,950 i = 6.25% N = 9 FV = PV6 = 1,950 i = 6.25% N = 8 FV = PV7 = 1,950 i...
*February 3, 2015*

**Finance**

Given an interest rate of 6.25% compounded annually, how much would you accumulate if you started with $3,250 and then contributed $1,950 per year (at the end of each year) for 13 years?
*February 3, 2015*

**Algebra 2**

f(x)=-x^2 - 3x Find the axis of symmetry, vertex, direction it opens, and write the equation in vertex form. If f(x) =x^2 + 2x g(x)= x-9 h(x) = 3x - 2 Find [f o g o h] (-2) Please explain how you got it I'm really confused right now.
*February 3, 2015*

**Chemistry**

Benzene has a vapor pressure of 183 mm Hg at 40 degrees Celsius. Taking it's heat of vaporization to be 30.8 kJ/mol, calculate it's vapor pressure at 25 degrees Celsius. The answer is 101 mm Hg, but I keep getting 4.613, and I can't figure out where 101 mm Hg comes...
*February 3, 2015*

**English**

This is from the scarlet letter
*February 2, 2015*

**English **

Chapter 23 and. 24 1. "Within the church, it had hardly been kept down; beneath the sky, it pealed upward to the zenith" is an example of a. Cumulative sentence B. Understatement C.oxymoron D balanced sentence E.paradox 2. What is the function of the words "...
*February 2, 2015*

**Physics**

A 447.5-N force accelerates a go-cart and its driver from 10.3 m/s to 16.7 m/s in 4.01 s. What is the mass of the go-cart plus driver?
*February 2, 2015*

**English**

Chapter 24 Scarlet letter Please tell me if these are correct or not The narrator characterizes Chillingworth by means of A. An allegory B.A Simile C.An allusion D.A metaphor E. An Anecdote I say D The narrator implies that the difference between hatred and love is primarily ...
*February 1, 2015*

**math**

Thom has a scale model of his car . The scale is 1:12 . If the actual car has 16-inch weeks,what size are the wheels on the scale model?
*February 1, 2015*

**English**

Can you check my answers to see if they are right and if not, help me on it? These questions begin with the paragraph starting with "Now was heard again the clangor of music ...." 1. In the first two paragraphs, the narrator conveys his mood of the market-place by ...
*February 1, 2015*

**ART check answers please**

Just took this test. #2 is C, #6 is B, #7 is C
*January 24, 2015*

**physics**

A physical pendulum is constructed of a 48 cm long piece of wooden dowel with a mass of 550 grams and a radius of 0.7 cm. Attached at one end of the pipe is a hoop with a radius of 6 cm and a mass of 1.2 kg as shown. The pendulum is released from the 12:00 position and allowed...
*January 23, 2015*

**English-Scarlet Letter**

1.How do the male characters treat, or talk about the female characters? 2.If the female characters had a power what kind will it be? Economical, Psychological, Social, Political , etc and Why? 3. Dimmesdale punishes himself because he wants redemption. I find what he is doing...
*January 21, 2015*

**math**

A grocery store is having a promotion for a new brand of milk.Every gallon has a 20% chance of having a coupon for a free box of breakfast cereal under the cap. If Valeria buys 3 gallons of milk,what is the probability that exactly one of them will win her a free box of cereal?
*January 21, 2015*

**Math**

Close, its D
*January 21, 2015*

**Math**

ok so 5x3=15 so there is 6 students so you would do 15 divided by 6. glad to help!
*January 21, 2015*

**social studies**

Like in the 1770s
*January 21, 2015*

**social studies**

How did diaries look like back then?
*January 21, 2015*

**Language Arts**

Yes, the answer is B. Glad to help!
*January 21, 2015*

**Physics**

A 100N force acting on a lever 2m from the fulcrum balances an object 0.5m from the fulcrum on the other arm. What is the weight of the object(in newtons)?What is it's mass (in kg)?
*January 19, 2015*

**Math**

the answer i do believe is to accompany your portfolio A
*January 14, 2015*

**math**

with solution pls...
*January 13, 2015*

**math**

the length of a rectangular mirror is 12 cm longer than its width. find its dimensional if its perimeter is 60cm.
*January 13, 2015*

**English**

Feminists argue that since the past millennium in the West have been dominated by men-whether they be politicians in power or the historians recording it all - Western literature reflects a masculine bias.and consequently, represents and inaccurate and harmful image of women....
*January 10, 2015*

**English**

Even though they are good friends, what is one argument seen in the play "The Night Thoreau Spent in Jail" between Henry and Waldo?
*January 8, 2015*

**math**

yesterday, molly lunch cost $9.80 and she left a $1.49 tip, today molly lunch cost $12.60 if she tips at the same rate that she did yesterday how much of a tip should molly leave
*January 7, 2015*

**mah**

holly spend 7 and 3/5 hours in school each day. her lunch period is 1/2 hour long, and she spends a total of 7/10 hour switching rooms between classes.the rest of her day is spent in 6 classes that are all same length. how long is each class?
*January 7, 2015*

**English**

Im going to base the essay on Edgar Allen Poe as well as Phillis Wheatly.
*January 7, 2015*

**English**

Thank you so much!
*January 7, 2015*

**English**

Im confused as to what two American writers i should form the essay around.
*January 7, 2015*

**English**

(I just need 2 writer ideas) In the middle of the 19th century, political philosopher Alexis de Tocqueville claimed, "The inhabitants of the United States have...properly speaking, no literature." In other words, de Tocqueville believed that America’s literature...
*January 7, 2015*

**English**

Thank you!
*January 7, 2015*

**English**

What is the social context in Edgar Allan Poe’s story, “A Tell-tale heart.”
*January 7, 2015*

**music appreciation **

Who was the first American-born conductor to lead the New York Philharmonic?
*December 21, 2014*

**Calculas**

area between the curves y=4-x^2 and y=x-8
*December 21, 2014*