# 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*

**Algebra 2 9th/11th grade math**

i don't know

*December 19, 2013*

**8th grade science :(**

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*

**Help please criminal j.**

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*

**Help please criminal j.**

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*

**MATH(please check only)**

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*

**7th grade math worksheet**

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**

where are the answers?

*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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