Thursday
March 30, 2017

# Posts by Q

Total # Posts: 88

Math 3rd
Tim tracked the change in outside temperature one afternoon. He recorded a temp of 85.4 f at noon. The Temperature then rose 3.85 f over the next 4 hours. At 5:00 Tim recorded the temperature of 89.25 f how did the temperature change betwn 4:00pm and 5:00pm? My cousin got the ...
March 13, 2017

math
simplify (8*10^7)(7*10^4) i think it's 5.6*10^10 simplify (3*10^6)(8*10^-4) i think it's 2.4*10^3 Astronomers measure large distances in light-years. One light-year 5.88*10^12 mi Star is 9.8*10^1 light years from Earth in scientific notation how many miles I think it&#...
March 10, 2017

Algebra
110 student went to the lake for a boat ride. there were 8 both (each would safely hold the same number of student), and all but 14 students could go for a ride. those remaining 14 students had to wait until first students finished their ride before they could go. how many ...
September 21, 2016

Math
water flows over a dam at a rate of 500 gallons per minute write a function rule relating the amount of water a that flow over the dam to the number of minutes m that have passed what are the initial value and rate of change
February 8, 2016

AP Chemistry
Calculate ΔHrxn for the following reaction: C(s)+H2O(g)→CO(g)+H2(g) Use the following reactions and given ΔH values: C(s)+O2(g)→CO2(g), ΔH= -393.5 kJ 2CO(g)+O2(g)→2CO2(g), ΔH= -566.0 kJ 2H2(g)+O2(g)→2H2O(g), ΔH= -483.6 kJ
December 7, 2015

Probability
Is that the right answer for c?
May 25, 2015

English.
Thanks?
March 12, 2015

English.
Please check my answers? Letter of Recommendation Mary O'Dell PLTW Program Willow High School 1400 Old Tamah Road Irmo, SC 29067 April 11, 2007 Subject: Letter of Recommendation for Mr. Chris Moses To Whom It May Concern: Chris studied under my supervision as a student ...
March 12, 2015

Algebra II
From 1990-1994 the mail order sales of health products can be modeled by S= 10t^3+115t^2+25t+2505 where S is the sales (in millions) and t the number of years since 1990. In what year were about \$3885 million health products sold.
March 2, 2015

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

AP Chemistry
I got it! The initial concentration of CN- would be 0.065 M rather than 0 M.
January 20, 2015

AP Chemistry
The Ksp of Ni(CN)2 is 3.0 × 10−23. What is the molar solubility of Ni(CN)2 in a 0.065 M KCN solution? Answer in units of mol/L. I found that the normal molar solubility is 1.957x10^-8, but I don't know how the KCN solution affects it. Sig figs aren't ...
January 20, 2015

chemistry
Calculate the amount of heat absorbed when 58 g of steam at 117◦C are completely converted to ice at −32.5◦C. Specific Heat: H2O(s) = 2.09 J/g◦C H2O(l) = 4.18 J/g◦C H2O(g) = 2.03 J/g◦C Heat of Fusion = 334 J/g Heat of Vaporization = 2260 J/g...
November 15, 2014

math
a football player attempts a field goal from a distance of 52 yards. The ball reaches a maxium height of 9 yrds and lands 8 yards behind the uprights. If the uprights are 3 yards high. algebraically determine if the field goal was successful
November 6, 2014

chemistry
i need help solving this Benzoic acid is a weak, monoprotic acid (Ka = 6.3 × 10−5). Calculate the pH and the percent dissociation of each of the following solutions of benzoic acid. Then use Le Châtelier’s principle to explain the trend in percent ...
June 7, 2014

chemistry
How would you do this question: A student dissolved 5.0 g of vitamin C in 250 mL of water. The molar mass of ascorbic acid is 176 g/mol, and its Ka is 8.0 × 10−5. Calculate the pH of the solution. Note: Abbreviate the formula of ascorbic acid to HAsc.
June 7, 2014

Maths Probability
Anyone got right answer for c = ?
May 20, 2014

probability
Let N be the numbers of passengers that show up. So p=0.9 and E[N]=0.9n and σ=(n*0.1*0.9)^1/2=0.3*n^1/2. Using Moivre-Laplace we have P(N≥300.5)≈0.01 Next you should use CLT, solving quadratic equation and find value of n
April 22, 2014

Probability
Jacob, can you explain how did you get these answers? I want understand this problem
April 3, 2014

Calculus
Find a positive number such that the sum of the square of the number and its reciprocal is a minimum.
March 25, 2014

For an outdoor concert, a ticket price of \$30 typically attracts 5000 people. For each \$1 increase in the ticket price, 100 fewer people will attend. The revenue, R, is the product of the number of people attending and the price per ticket. a) Let x represent the number of \$1 ...
March 25, 2014

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

A rectangular piece of paper with perimeter 100 cm is to be rolled to form a cylindrical tube. Find the dimensions of the paper that will produce a tube with maximum volume. I have made it up to getting an equation for V(w).
March 25, 2014

Math
2x(√3x^2)*2√x how would you simplify this?
February 17, 2014

Math
2x√3x*2√x i was wondering how to simplify this
February 17, 2014

AP Chemistry
The Ksp of Ni(CN)2 is 3.0 × 10−23. What is the molar solubility of Ni(CN)2 in a 0.065 M KCN solution? Answer in units of mol/L. I found that the normal molar solubility is 1.957x10^-8, but I don't know how the KCN solution affects it. Sig figs aren't ...
December 2, 2013

Complex Math
Compute all possible values of e^i
November 25, 2013

Calculus
Evaluate the surface integral. the double integral of (x^2 + y^2 + z^2)dS over Region S. S is the part of the cylinder that lies between the planes z = 0 and z = 5, together with its top and bottom disks Can anyone help?
November 6, 2013

multivariable calculus
Studying for a test, and saw this: Find the center of mass of the hemisphere x^2 + y^2 + z^2 = a^2; z>=0 if it has constant density. Any ideas?
November 6, 2013

physics
In attempting to jump up a waterfall, a salmon leaves the water 2.0 m from the base of the waterfall. With what minimum speed must it leave the water in order just to make it up a waterfall 1.6 m high?
September 22, 2013

Improving writing assignment
I have noticed that in the last three months, the performance and qualities of work has been compact due to workloads unbalanced, since Jessica Hilo our executive manager has been on medical leave for last four months. Her responsibilities have been shared between Ralph and ...
September 8, 2013

english
What is the author referring to in this reading passage? Thus early had that one guest,--the only guest who is certain, at one time or another, to find his way into every human dwelling, --thus early had _______ stepped across the threshold of the House of the Seven Gables!
July 7, 2013

physical
David's clock ticks once for every two of Phil's clock ticks. How fast is Phil moving by David?
June 17, 2013

physical
Franky claims he has a mass of 65kg. He is sitting on a spherical bouy that oats just barely submerged under water. When he gets o it rises halfway out of the water. What must the radius R in centimeters of the sphere be for him to be telling the truth?
June 17, 2013

PHYS
You throw a bowling ball o the empire state building(381m high) 10m/s down- ward. How long does it take to get to the bottom?
June 17, 2013

algebra
If Jenny's car uses less gas per mile driven than Sandra's truck, how does the graph representing the rate of change of Sandra's truck compare to the graph representing the rate of change of Jenny's car?
June 16, 2013

math
What?
May 9, 2013

Quick Math Question
How do I add time? If a person worked 4 1/2 hours on Monday, 4 1/2 hours on Tuesday and 2 hours on Wednesday, does that add up to 12 hours? If not, how much more time would the person need to work the next day to equal 12 hours?
March 28, 2013

Soc Stud
so its c
March 7, 2013

Chemistry
January 27, 2013

engineering mechanics
A person A is trying to keep his balance while on a sled B that is sliding down an icy incline. Let mA = 78kg and mB = 25 kg be the masses of A and B, respectively. In addition, let the static and kinetic friction coefficients between A and B be μs = 0.4 and μk = 0....
December 31, 2012

Physics
A refrigerator does 18kJ of work while moving 115 kJ of thermal enegy from inside the refrigerator. What is its coefficient of performance?
November 22, 2012

Physics
A refrigerator has a coefficient of performance of 4.0. When removing 2.4x10^4 J from inside the refrigerator, how much energy is sent into the environment?
November 19, 2012

Math
For a class C corporation in Louisiana, the amount of state income tax S is deductible on the federal return and the amount of federal income tax F is deductible on the state return. With \$200,000 taxable income and a 30% federal tax rate, the federal tax is 0.30(200,000 - S...
October 17, 2012

math
123145
September 27, 2012

Chemistry
Consider this equilibrium N2(g) + H2(g) <==> NH3(g) +94 kJ The equilibrium law exoression for the balanced chemical equationwould be A. [N2][H2]/[NH3] B. [NH3]/[H2][N2] C. [NH3]2/[H2][N2] D. [NH3]2/[H2]3[N2] E. 2[NH3]2/3[H2]3[N2]
January 3, 2012

Chemistry
which of the following statement are true for all electric cells? I. electrons flow from the anode to the cathode II. reduction occurs at the anode III. oxidation occurs at the cathode IV. oxidation occurs at the anode V. reduction occurs at the cathode A. I,IV and V B. I,II ...
January 3, 2012

maths
if 3x + 8 =20 - 3x, what is x
August 27, 2011

geometry
if 3x + 8 =20 - 3x, what is x
August 27, 2011

math
You receive an invoice for \$565.00 with terms 3/10, net 30. If you pay it immediately, how much will you pay?
June 3, 2011

american government
What is the difference between civil liberties and natural rights?
May 4, 2011

Math
a.Set table as x,chair as y 90x+40y<or=1000 b.just plug in and try c.so y=6x substitute 6x for y you get 90x+240x<=1000 so x<=100/33 greatest one is 3 for table,18 for chair
March 20, 2011

Physics
Question, wouldn't it be 720 years? Because 10 years = 1 century. So .001ms/day ( 365days/yr) * 720 years * 1s/1000ms * 1hr/3600s
January 12, 2011

math
6 minutes
December 7, 2010

math
5x-3y=11 4x-7y=18
December 2, 2010

accounting
Derm Travel Agency accepted a four-month, 9% interest rate, 52.000 note from one otits customers on May 1, 2008. The entire balance is payable at the notes maturity. Prepare the May 31 adjusting journal entry related to this note. Do I debit cash and interest receivable; and ...
November 13, 2010

chinese
tian cai
November 10, 2010

chemistry
A jogger runs at an average speed of 5.9 mi/h. If she starts a run at 11:15 am, what time is it after she covers 4.75 x 104ft?
September 3, 2010

physics
shut up
April 26, 2010

environmental science for college
March 28, 2010

Aboringjob
March 20, 2010

MATH157
SUPPOSE YOU BUY 1 TICKET FOR \$1 OUT OF A LOTTERY OF 3000 TICKETS. IF THE PRIZE FOR THE ONE WINNING TICKET IS TO BE \$500, WHAT ARE YOUR EXPECTED WINNINGS?
March 18, 2010

apply the formula of (a-b)^2 i.e a^2-2ab+b^2. the required answer is 9x^2-24x+16.
January 20, 2010

Chemistry
why different detergents have different price?on what physical properties are their qualities based?
January 19, 2010

chemistry
A sample of silver chromate (Ag2CrO4) has a mass of 29.0 g. (a) How many Ag+ ions are present? (b)What is the mass in grams of one formula unit of silver chromate? (c) How many CrO42- ions are present?
January 13, 2010

chemistry
Determine the number of representative particles in each of the following and identify the representative particle. a. 13.0 mol Ag b. 23.7 mol H20 c. 0.178 mol NaCl
January 13, 2010

chemistry
how many grams of CaCl2 would be dissolved in 1.9 liters of a 0.2 molarity solution of CaCl2?
January 13, 2010

chemistry
Determine the number of moles of sulfate ions present in 1.20 mol iron(III) sulfate (Fe2(SO4)3).
January 13, 2010

social studies
what colonies French find as a result of the northwest passage way.
November 18, 2009

math
The sales representative informs you that there are two floor plans available, and that there are a total of 56 houses available. Use x to represent floor plan #1 and y to represent floor plan #2. Write an equation that illustrates the situation. The sales representative later...
April 25, 2009

spelling
well what is it? i don't get it :'(
February 19, 2009

social studies
Without our two great political parties cutting across economic and geographic interests, democracy as we know it could never have been made to function." The author of this statement probably meant to suggest that
February 9, 2009

physics
A 47.0 g golf ball is driven from the tee with an initial speed of 54.0 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. What is its speed when it is 9.0 m below its highest point
October 21, 2008

chemistry
Answer is 1480g Do the math. Someone already gave the formula. The cm cancels out after multiplying. Note: you have to cube the 5.5cm
September 11, 2008

life science
Explanation of why the process of mitosis and meiosis are both important to a living organism. When would an organism need to undergo the process of mitosis? When would an organism need to undergo the process of meiosis? What would happen if meiosis did not occur I will gladly...
August 10, 2007

algebra
i need help finding the base. this is the equation i got after work it out halfway. 42/h+h+sqroot(42/h)^2+h^2=20 ft how can i find B & H. How should i go about. Thanks. Isnt the sqrt of (42/h)^2 just 42/h ? Then, multipy both sides of the equation by h, that gives you a third ...
August 6, 2007

Life Science
How did Mendel’s approach to answering scientific questions differ from that of his contemporaries? Thank you for using the Jiskha Homework Help Forum. You might want to see the answer just posted for Diana.
August 4, 2007

help with solving
x^2+(x-2)^2 = (2x-6)^2 solve for x. thanks so much. Please keep in mind that tutors here won't simply do your work for you. I'm sure you'll get a better response if you show your work as far as you can get, so tutors will know where you get stuck. =) it was a word ...
August 3, 2007

algebra
solve for x (24+2x)(10+2x) - 240 = 152 First multiply. 24(10) = ___ 2x (2x) = ____ Now subtract 240. Can you finish the problem from here? dont i need to put this in equatic equation to solve for x. cause i need to find the width of a small rectangle inside a bigger triangle. ...
August 3, 2007

Life science
are humans subject to the same pressure of natural selction as other organism Humans show signs of natural selection occuring, according to these studies. http://www.news.cornell.edu/stories/Oct05/Bustamante.kr.html (Broken Link Removed)
July 25, 2007

Science
I need to know how to compare mouthwash and toothpaste...what to compare?.. compare bacteria samples in salaiva.
February 26, 2007

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