Saturday
December 3, 2016

# Posts by Robby

Total # Posts: 63

Math
Given that ?f(x)=x^2-15 and ?g(x)=10??x, find ?(f??g)(3?), if it exists.
November 16, 2016

Math
I'm sure he means "^" as √ or the square root symbol
October 14, 2015

physics
The length of a moving spaceship is 27.0 m according to an astronaut on the spaceship. If the spaceship is contracted by 14.5 cm according to an Earth observer, what is the speed of the spaceship? I know L=27m and delta L= 0.145 so our contracted length is 26.855 so what ...
May 4, 2015

Chemistry
Dr. Bob, as grateful as I am you took the time to answer my question, I do not believe you are right. In order to get Q, it needs to be in atm, and I am dealing with M? if I am wrong, can you explain to me what I would need to do next?
May 2, 2015

Chemistry
H2 (g)+I2 (g)↔2HI(g) Calculate ΔG for the system at 700 K when the concentrations are [H2] = 0.12M, [I2] = 0.27M, and [HI] = 0.118M. What would be my first step? If I make an ICE chart, what would I do from there? I just need the first step to help me out :( THANKS!
May 2, 2015

Physics
The rate of motion of the earth at its equator is about 1,038 mi/h because of its rotation. From this information, estimate the earth's circumference using an order-of-magnitude estimate.
January 13, 2015

Math
Find the value of b, if any, that will make the function differentiable at x = 0 g(x)= { x+b, x<0 cos(x), x≥0 can you help, I got 0 but I don't know if that will make the function differential at x=0.
November 16, 2014

Algebra 2
x/4-4/x over 1-4/x simplify this
September 18, 2014

social problems
Justin makes a comfortable living as a construction worker. Other people who were in high school with him have bigger houses and drive fancier cars. Justin thinks he deserves to have more money, so he begins to make plans to rob a bank. What theory of violence best explains ...
June 2, 2014

pure liquid
what is the density,volume and mass of a pure liquid
April 7, 2014

i don't know
December 19, 2013

the sun influences tides buy pushing or pulling the water.
November 23, 2013

C/J
Which of the following is sometimes held to be the only event for which there is no cause? a.freewill b.emotions c.viruses d. moral character Is it free will not sure
October 1, 2013

Math
A perfect positive or negative correlation means that A) the explanatory causes the y-variable. B) 100% of the variation is explained. C) we get the same regression equation if we switch the x and y variables. D) the slope of the regression equation is 1.0 I chose B
September 18, 2013

Math
Because perfect correlation is r= 1 or r= -1? Is my answer not correct?
September 18, 2013

Math
If two variables are very strongly associated, the correlation between them will be near 1.0 or -1.0. A) False B) True I put false because the variable have to be quantitative and they have to be perfect...
September 18, 2013

Statistics
The annual snowfall in a town can be represented by the Normal model N(46, 6.8). In about 2.5% of the years, the annual snowfall in this town will exceed: A) 46 inches B) 39.2 inches C) 52.8 inches D) 59.6 inches E) 66.4 inches I don't know how to set this problem up to ...
September 15, 2013

geography
The river which carries the most traffic in Europe and is the continent's most important inland waterway is the: Is it the Rhine river or the Danube River not sure. i think it is the Danube River am i correct?
August 11, 2013

Obtaining a confession by _______ is constitutional. a. misrepresentations b. psychological coercion c. physical coercion d. none of the above I choose D. none of the above
July 6, 2013

1. In re Gault assured juveniles a. the right to a jury trial b. all the above c. due process in the legal system d. the right to be tried as an adult All the above 2. Obtaining a confession by__ is constitution a. misrepresentations b. psychologicalcoercion c. physical ...
July 6, 2013

Chemistry 2 Lab
Nevermind. I got it. It would help if I looked at the concentration data that my lab book gives me complete the problem:)
March 19, 2013

Chemistry 2 Lab
Calculate the degree of ionization of acetic acid in solution 1 through 3? All I am giving is the pH... pH of solution 1= 3 pH of solution 2= 3.5 pH of solution 3= 5 Then, I did this... HC2H3O2 (aq) + H2O (l) equals H3O+ (aq) + C2H3O2- (aq) Ka= 1.7 E -5 (according to chart in ...
March 19, 2013

Chemistry
If some NH4Cl is added to an aqeous solution of NH3: A. pH of solution will decrease B. PH will not change C. pH will increase D. NH4Cl cannot be added to NH3 E. The solution will not have pH I think the answer is B, because if NH4Cl is added to the solution of NH3, then ...
March 7, 2013

Chemistry
What will happen if a small amount of hydrochloric acid is added to a 0.1 M solution of HF? A) The percent ionization of HF will increase. B) The percent ionization of HF will decrease. C) The percent ionization of HF will remain unchanged. D) Ka for HF will increase. E) Ka ...
March 7, 2013

Chemistry
A solution has a hydroxide-ion concentration of 7.48X10-5 M. What is it's hydronium-ion centration? I have no idea where to begin on this question...
February 18, 2013

Chemistry
Thanks. Is there a way to tell how one acid is weaker than the other or do you have to memorize the charts?
February 17, 2013

Chemistry
Determine the direction of the following reaction from the relative strengths of acids and bases: H2S(aq) + C2H3O2-(aq) yields Hc2H3O2(aq) + HS-(aq) The book says this will favor the reactants. I'm confused...shouldn't this be neutral because both reactants and ...
February 17, 2013

Chemistry
At 900.0K, the equilibrium comstant (kp) for the following reaction is 0.345 2SO2 (g) + O2 (g) yields 2SO3 (g) At equilibrium the partial pressure of SO2 is 35.0 atm and that of O2 is 15.9 atm. What is the partial pressure of SO3 in atm? 6.20 X 10-4 ( I think it is this one) ...
February 10, 2013

Chemistry
I think I tried to do the ICE and got... 2.06/2.00=1.03 M 0.0227/2.00=0.0114 M but got lost after that and ended up with 1.73 X 10-6...I am really struggling on these problems...
February 10, 2013

Chemistry
2NF3(g) yields N2(g) + 3F2(g) When 2.06 mol of NF3 is placed in a 2.00L container and allowed to come to equilibrium at 800K, the mixture is found to contain 0.0227 mol of N2. What is the value of Kp at this temp? 1.91 X 10-3 1.73 X 10-6 (think this is it) 4.43 X 10-7 1.83 X 10-3
February 10, 2013

Chemistry
Sir, thank you for answering. I thought it was the adding the Cl2, but it was wrong. That is why I went with decreasing the temp, but now knowing that it is wrong as well. I think my only option is the addition of PCl5 (which I meant to put at the top vice Pcl4) I hope I am on...
February 10, 2013

Chemistry
Consider the following equilibrium: PCl3 (g) + Cl2 (g) yields PCl5 (g) delta H= -92KJ The concentration of PCl3 at equilibrium may be increased by: decreasing the temp (think this is it) adding Cl2 to the system the addition of neon the additio of PCl4
February 10, 2013

CHM
Calculate the molecular weight of a small protein if a 0.32 g sample dissolved in 161 mL of H2O has an osmotic pressure of 9.0 mmHg at 25 degree celcius. (R=0.0821 L X atm/K X mol)
January 13, 2013

Physics
Our Milky Way galaxy is very similar to our neighboring galaxy Andromeda. Consider that each galaxy contains approximately 4.0 x 10^11 stars each star having an average mass of 2.0 x 10^30 kg. a. If the gravitational pull of Andromeda is 2.4 x 10^30 N, how far away is ...
January 4, 2013

Spanish
What does Que compras tu para tu madre? Mean
February 15, 2012

Spanish
How do you say "I will travel to California in the fall" in Spanish
February 15, 2012

marketing
Choose a real or made up example of a company, and describe at least three fixed costs the company has.
January 26, 2012

physics
I don't know.
December 6, 2011

Unscramble
beuaty lies in the eyes of the beholder
October 14, 2011

math sequence
the first 5 terms of a linear sequence are given below: 8,6,4,2,0... What is the 100th term in the sequence? A. -192 B. -190 C. -108 D. -90 I could figure this out in like 5 minutes, but I know there's a pattern I can't remember to figure it out quicker.
October 14, 2011

algebra
4y + 5x = -7 divide everything by 4 to get y alone 4y/4 + 5x/4 = -7/4 y + 5x/4 = -7/4 subtract 5x/4 from both sides of equation y +5x/4 = -7/4 -5x/4 -5x-4 ________________ y = -5x -7 / 4 -5x - 7 ___________ 4
October 14, 2011

algebra
x + 15 = 85 - 15 -15 (subtract 15 from both sides of equation to get x alone and keep equation equal.) x=70
October 14, 2011

100th term of sequence?
the first five terms of a linear sequence are 8,6,4,2,0.... What is the 100th term of the sequence? I could figure this out with a few minutes of patience. But I know there is formula which I cannot find anymore to solve it quicker :)
October 14, 2011

patterns
the first five terms of a sequence are shown below: 8,6,4,2,0 ... What is the 100th term in the sequence? A. -192 B. -190 C. -108 D. -90 I know how to figure this out but it would take a few minutes. There UST be some sort of formula?
October 14, 2011

math
mistyped before. A sphere has a volume of 500/3 pi cubic centimeters. What is the total surface area in square centimeters, of the sphere? The correct answer is 100pi, but I have no idea why. I need to see it worked out from start to finish :(
October 14, 2011

math
a sphere has a volume of 500/3pi cubvic centimeters. What is the total surface area, in square centimeters, of the square? The answer is 100pi, but i don't know why. HELP!!!!!!!!!
October 14, 2011

math
a sphere has a volume of 500/3 pi cubic centimeters. What is the total surface area, in sqaure cntimeters, of the square? A. 25 pi B. 40 pi C. 100 pi D. 400 pi Please show your work. im very confused :(
October 14, 2011

math
scientific notation needs to re-written as 2.25x10 to a power. exponents always confuse me, but my answer has to equal 225,000,000. so 10 to the second power is 100. it also has 2 zeroes after the one. 1000 is ten to the hird power (3 zeroes after the ones. 100,000,000 would ...
October 14, 2011

math test
15 is a whole number. .56 is a decimal. so it needs to be rewritten as 15.00 -0.56 _______ 14.44 in whic case the asnwer is 14.44 :)
October 14, 2011

algebra
a sphere has a volume of 500/3pi cubic centimeters. What is the total surface area, in square centimeters, of the sphere?
October 14, 2011

Statistics
Suppose that weights are bell shaped with a mean of 120 pounds and a standard deviation of 10 pounds. What percentage of weights is between 110 and 130 pounds
May 14, 2011

Number of Cans of Corn Cost 3 \$1.95 5 \$ 3.25 6 \$3.90 9 \$5.85 Write an equation to represent the data how do i do that I think the answer is 0.65n = c
April 26, 2011

MATh
Number of Cans of Corn Cost 3 \$1.95 5 \$ 3.25 6 \$3.90 9 \$5.85 Write an equation to represent the data how do i do that
April 26, 2011

MATH
L x W x H = volume
April 20, 2011

Social Studies(child Labor)
I need a creative idea for my child labor board. What should i paint on my board can u help me please
April 20, 2011

Algebra
Square root of 14abc times the square root of 2ab
March 29, 2011

Dirty croch
February 17, 2011

Physics
Three Coulombs of charge flow through a wire in 150 ms. If the current ceases to flow (goes to zero Amps) for the following 850 ms, what is the average current over this one-second period?
September 18, 2010

algebra
6x+1408-88x=1072 you may move the decimal 1 place if you want 1408-82x=1072 1408-1072=82x 336=88x x=336/88
November 7, 2009

Economics
April 14, 2009

statistics
The Intelligence Quotient (IQ) test scores are normally distributed with a mean of 100 and a standard deviation of 15. What is the probability that a person would score 130 or more on the test?
December 8, 2008

science
i need help making a catapult. im gonna check my pc tomorrow
October 11, 2008

Algebra II
i needhelp with solving systems of equetions algebrically
October 29, 2007

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