# Posts by katrina

Total # Posts: 267

**statistics**

From the Arizona Department of Weights and Measures: Among 31 inspections sat a NAPA Auto Parts store, 88% failed. X= ?

*December 4, 2011*

**physics**

A six kilogram object undergoes an acceleration of 2.0 meters per second squared. Part a. What is magnitude of the net force acting on the object? Part B. If the same force is applied to a 4 kilogram object what acceleration is produced?

*October 19, 2011*

**Calc**

If a rock is thrown upward on the planet Mars with a velocity of 17 m/s, its height (in meters) after t seconds is given by H = 17t − 1.86t^2. (a) Find the velocity of the rock after one second. (b) Find the velocity of the rock when t = a. (c) When will the rock hit the...

*October 17, 2011*

**math**

(7+9)+3= 1+(9+5)=

*October 6, 2011*

**Math**

Find the cost function if the marginal cost function is dC/dx=2x-15 and fixed costs are $75.

*August 26, 2011*

**Calculus**

Find all points at which the graph of f (x) = x^3 −3x has horizontal tangent lines.

*August 23, 2011*

**Chemistry**

I need help writting a formula for: AgNO3(l) + PbNO3(l) + HgNO3(l) + HCl (l)

*July 5, 2011*

**Chemistry**

A liquid hydrocarbon (Cx Hy) is found to be 16.37% H by mass. A 1.158-g vaporized sample of the hydrocarbon has a 358 mL volume at 71.0 C and 749 mmHg. what is the molecular formula for this hydrocarbon?

*June 21, 2011*

**Chemistry**

3. A liquid hydrocarbon (Cx Hy) is found to be 16.37% H by mass. A 1.158-g vaporized sample of the hydrocarbon has a 358 mL volume at 71.0 C and 749 mmHg. what is the molecular formula for this hydrocarbon? 4. A 1.00 g Sample of C7H603 (s), us completely burned in a bomb ...

*June 21, 2011*

**precalculus**

Find an angle between o and 2pi that is coterminal with the given angle -8pi/3: 71pi/2: 11pi/7:

*May 4, 2011*

**precalculus**

Write and simplify the difference quotient for the function b(t)= 3t^2-4t+5 over the interval [7,7+h]

*April 13, 2011*

**Calculus (pleas help I really need to check this)**

Consider a window the shape of which is a rectangle of height h surmounted a triangle having a height T that is 1.3 times the width w of the rectangle. If the cross-sectional area is A, determine the dimensions of the window which minimize the perimeter. h=______ w=______ What...

*April 11, 2011*

**Calculus (please help I really need to check this)**

Consider a window the shape of which is a rectangle of height h surmounted a triangle having a height T that is 1.3 times the width w of the rectangle. If the cross-sectional area is A, determine the dimensions of the window which minimize the perimeter. h=______ w=______ What...

*April 11, 2011*

**science**

The resulting solution is saturated because 86 is what equals both of the grams of salt added to the water at degrees C. 15 g + 50 g = 86 grams

*April 11, 2011*

**Calculus (pleas help I really need help with this)**

The cross-sectional area is jus the rectangle...

*April 10, 2011*

**Calculus (pleas help I really need help with this)**

I tried that... it's not it... apparently there must be something wrong with the arythmetic but I can't find what it is...

*April 10, 2011*

**Calculus (pleas help I really need help with this)**

Consider a window the shape of which is a rectangle of height h surmounted a triangle having a height T that is 1.3 times the width w of the rectangle. If the cross-sectional area is A, determine the dimensions of the window which minimize the perimeter. h=______ w=______ What...

*April 10, 2011*

**Calculus (please help!!!!)**

Consider a window the shape of which is a rectangle of height h surmounted a triangle having a height T that is 1.3 times the width w of the rectangle. If the cross-sectional area is A, determine the dimensions of the window which minimize the perimeter. h=______ w=______ What...

*April 10, 2011*

**Calculus (please help!!!)**

Consider a window the shape of which is a rectangle of height h surmounted a triangle having a height T that is 1.3 times the width w of the rectangle. If the cross-sectional area is A, determine the dimensions of the window which minimize the perimeter. h=______ w=______ What...

*April 10, 2011*

**Calculus**

Hi, I wasn't posting under different names, I have just used my name and I was just posting the explanation I received from other tutor, I didn't understand some of it so I posted it again because right now it must be on page 5 or something like that... I'm not ...

*April 10, 2011*

**Calculus**

In a chemical reaction, substance A combines with substance B to form subtance Y. At the start of the reaction, the quantity of A present is a grams, and the quantity of B present is b grams. Assume a is less than b. At time t seconds after the start of the reaction, the ...

*April 10, 2011*

**Calculus please help!!**

Consider a window the shape of which is a rectangle of height h surmounted a triangle having a height T that is 1.3 times the width w of the rectangle. If the cross-sectional area is A, determine the dimensions of the window which minimize the perimeter. h=______ w=______ What...

*April 10, 2011*

**Calculus**

In a chemical reaction, substance A combines with substance B to form subtance Y. At the start of the reaction, the quantity of A present is a grams, and the quantity of B present is b grams. Assume a is less than b. At time t seconds after the start of the reaction, the ...

*April 10, 2011*

**Calculus (please help!!!)**

Consider a window the shape of which is a rectangle of height h surmounted a triangle having a height T that is 1.3 times the width w of the rectangle. If the cross-sectional area is A, determine the dimensions of the window which minimize the perimeter. h=______ w=______ What...

*April 10, 2011*

**Calculus**

In a chemical reaction, substance A combines with substance B to form subtance Y. At the start of the reaction, the quantity of A present is a grams, and the quantity of B present is b grams. Assume a is less than b. At time t seconds after the start of the reaction, the ...

*April 10, 2011*

**Calculus**

HI, Thanks for the explanation, that makes a lot of sense, I don't know why it didn't occur to me that mass can't be negative... but I typed those answers and I still get them both wrong... I don't know why...

*April 10, 2011*

**Calculus**

In a chemical reaction, substance A combines with substance B to form subtance Y. At the start of the reaction, the quantity of A present is a grams, and the quantity of B present is b grams. Assume a is less than b. At time t seconds after the start of the reaction, the ...

*April 10, 2011*

**precalculus**

For the Function, y= x(x-4)(x+8) Y-intercept is: X-intercept is:

*April 4, 2011*

**Chemistry**

Calculate the pH after 0.13 mol of NaOH is added to 1.00 L of the solution that is 0.57 M HF and 1.13 M KF. I got the answer of 3.66 to 3 sig figs, but it's wrong. Can you please tell me what I did wrong? -Thanks

*March 27, 2011*

**precalculus**

Twenty percent of a radioactive substance decays in ten years. By what percent does the substance decay each year?

*March 3, 2011*

**precalculas**

The doubling period of a baterial population is 20 minutes. At time t=100 minutes, the baterial population was 80000. What was the initial population at time t=0? Find the size of the baterial population after 4 hours.

*March 1, 2011*

**precalculas**

the amount of bacteria in a petri dish increased by a percent change of 12% each hour over a period of 15 hours. a. find the growth factor for 1 hour? b. by what total percent did the bacteria change during this 15- hour time period.? c. how long will it take for the bacteria ...

*March 1, 2011*

**precalculas**

Given the function f(x)= 4+4x^2, calculate the following values: [f(a+h)-f(a)]/h

*February 26, 2011*

**precalculas**

i tried like 7 times stil getting it wrong.

*February 25, 2011*

**precalculas**

Let f(x) be the function 8x^2-5x+2 . Then the quotient [f(5+h)-(5)]/h can be simplified to ah+b for: a= b=

*February 25, 2011*

**precalculas**

Let f(x) be the function 1/[x+12] . Then the quotient [f(4+h)-f(4)]/h can be simplified to for: -1/[ah+b] a= b=

*February 25, 2011*

**Chemistry**

I did those steps and got .869 for CH2Cl2 and .130 CH2Br2 (assuming that both is in the correct number of sigfigs), but they don't seem to be right. I just want to know what I am doing wrong, or is this also the answer you got.

*February 20, 2011*

**Chemistry**

A solution is prepared by mixing 0.0400 mol CH2Cl2 and 0.0700 mol of CH2Br2 at 25°C. Assuming the solution is ideal, calculate the composition of the vapor (in terms of mole fractions) at 25°C. At 25°C, the vapor pressures of pure CH2Cl2 and pure CH2Br2 are 133 and...

*February 20, 2011*

**precalculas**

f(x)=2-9x find f^-1(6)

*February 13, 2011*

**Chemistry**

A 13.0-g sample of ice at -13.0°C is mixed with 112.0 g of water at 80.0°C. Calculate the final temperature of the mixture assuming no heat loss to the surroundings. The heat capacities of H2O(s) and H2O(l) are 2.08 and 4.18 J/g · °C, respectively, and the ...

*February 13, 2011*

**math**

f(x)=2-9x find f^-1(6)

*February 11, 2011*

**psychology**

you are conducting research on sex differencesin emails .Your hypothesis is that the men use more declarative statements and women use more questions.what might be the advantages of using the archival method

*February 4, 2011*

**math**

Plot the points A(2,2), B(4,6),C(10,-2)Notice that these points are vertices of a right triangle (the angle is 90 degrees). Find the area of the triangle ABC:

*February 3, 2011*

**math**

Find the point (o,b) on the y-axis on the y-axis that is equidistant from the points (1,1) and (2,-1)

*February 3, 2011*

**calculus**

suppose the endpoints of one side of a rotated square are (-5,-5) and (1,-1). Find the dimensions and area of the square

*February 3, 2011*

**personal planning**

what types of diseases can you get if you are unhealthy?

*January 26, 2011*

**humanistic theory**

People often make career changes in their lives. How would the humanistic theory of behavior explain this phenomenon?

*December 3, 2010*

**math**

He becomes an electrician

*November 30, 2010*

**poetry**

What is the meaning of the phrase "steal the secret of the sun"

*November 15, 2010*

**math**

If 3 men who are yhe same in size need to drink 12 glasses of milk in a certain time, how many glasses of milk will 7 men who are the same size as them need in the same time frame they needed 12 glasses?

*November 11, 2010*

**math**

Estimate to the nearest 100 if you have: a) 56 293 b) 6 521 308

*November 11, 2010*

**math**

a) how many tens are in 1000? b) how many hundreds are in 6000? c) how many thousands are in 2 000 000?

*November 11, 2010*

**Science**

Human caused chemical changes would be I think greenhouse gases,and water pollution.

*November 10, 2010*

**Bassick High School**

this is the work on how to do it Vf = Vi+at Vf = 1.3+0.09*10 = 2.2 m/s b. jogging

*September 7, 2010*

**Bassick High School**

the speed after 10.0s is 2.2 m/s she is jogging

*September 7, 2010*

**medical coding 1**

exam 22111063

*August 3, 2010*

**Algebra**

Solve the system by either elimation or substitution: x+8y=18 y=-2/7x-18/7

*August 2, 2010*

**math**

1/2a-5=1/3a-1 please show me how to set this problem up and solve it

*July 19, 2010*

**macroeconomics**

Cyclical unemployment arises in part from a desire by workers to move from low-paying,low-productivity jobs to higher-paying, higher productivity jobs.

*June 9, 2010*

**college:Macroeconomics**

Which of the following is not economic investment? (a). The purchase of 100 shares of AT&T by a retired business executive. (b). The purchase of a drill press by the Ajax Manufacturing company. (c). Construction of a suburban housing project. (d). The piling up of inventories ...

*June 5, 2010*

**college: ECON**

Are you still looking for the answer.

*June 5, 2010*

**college: ECON**

The answer is true or false.

*June 5, 2010*

**Math**

A hat contains 20 names, 9 of which are females. If 8 names are randomly drawn from the hat, what is the probability that at least 6 male names are drawn??????

*June 1, 2010*

**french**

im begging you! somebody pleaaaaaase help me on this! i have about 5 hours before its due!!

*May 26, 2010*

**french**

if anyone would have the heart to look up cars of the 60's and write out a small paragraph in french about them too, i would be forever grateful!!!

*May 26, 2010*

**french**

PLEASE HELP !! i really need this translated !

*May 26, 2010*

**french**

How do u say: In the 60's, people listened to the Beatles, Francois Hardy, Gilles Vigneault, Jacques Dutronc, Bridgitte Bardot, and Buffy Sainte-marie. The beatles was a soft rock band that formed in liverpool in the 1960's. John Lennon was the lead vocalist while Paul...

*May 26, 2010*

**12th grade**

The Swiss franc is selling for $.7681 and the British pound is selling for $1.6581. The cross rate between the franc and the pound is? I figured out 2.16 but I have so much scribling over it I cant now refigure it out with our gettting it correct again. Can someone simplify ...

*May 12, 2010*

**math**

If one clerk can process 75 pieces of mail in 2 and 1/2 hours, how long will it take eight clerks to process 1620 pieces of mail if all of them work at this same rate?

*April 28, 2010*

**Accounting**

How do I balance out the adjustments made by the extra information?

*April 18, 2010*

**health**

How do factors in the biopsychosocial model operate when you make a decision that affects your health? Think of examples of when you made either good or poor decisions. The health consequences of your decisions can be minor or major.

*April 14, 2010*

**Accounting**

i got the trial balance but I am trying to figure out how to get my adjustments correct what about you?

*April 12, 2010*

**English**

The mom left the room with an modicum of respect after her baby began? Sleeping Screaming Praying Singing

*April 5, 2010*

**5th grade math - multiplying decimals**

89

*February 10, 2010*

**Math**

What would the absolute value be? \ 2-3\ if you solve it the answer comes to -1 but can you have a negative as your answer for absolute value?

*February 5, 2010*

**3rd grade**

cheerios

*February 3, 2010*

**popular american culture**

how can i post my essay to this website and then i might can get the help i need because im getting cluster with fusturated please help me

*February 3, 2010*

**popular american culture**

hi i had to write a paper on print media and i sent my paper though writepoint and it said that this phrase of my paper was to wordiness and consider revising nothing inappropriate so what else could i say thank you

*February 3, 2010*

**popular american culture**

please forgive me just was typing in cap no disrepected to anybody. i need a good example of how to rewrite this fragment sentence the endeavor to influence a specific audience to buy a goods or service or a specific belief i need someone just to show me what wrong with this ...

*February 3, 2010*

**popular american culture**

how would i rewrite a fragment sentence for example THE ENDEAVOR TO INFLUENCE A SPECIFIC AUDIENCE TO BUY A GOODS OR SERVICE OR A SPECIFIC BELIEF SHOW ME HOW TO REWRITE IT PLEASE

*February 3, 2010*

**college**

I NEED A GUIDELINE ON HOW TO SET UP THIS COMPILE INVENTORY FOR POPULAR CULTURE THAT I COME IN CONTACT WITH I NEED TO DESCRIBE THE IMPACT THAT THESE ARTIFACT HAVE ON MY PERSONAL DESCISION MAKING I NEED TO IDENTIFY THE PATTERNS OR SIMILARITIES IN MY INVENTORY ALSO NEED TO ...

*January 18, 2010*

**math**

I have no idea how to do these please help(: evaluate each of the following 1. 81^-1/4 (81 to the negative power of one fourth) 2. 125^2/3 3. 64^-3/2 4. 4^3/2 answers and work please

*January 6, 2010*

**math**

I have no idea how to do these please help(: evaluate each of the following 1. 81^-1/4 (81 to the negative power of one fourth) 2. 125^2/3 3. 64^-3/2 4. 4^3/2 answers and work please

*January 6, 2010*

**Geography**

population growth

*December 15, 2009*

**Geography**

What does the federal government impose on a high horsepwer that uses more fuel vehicles?

*December 11, 2009*

**Geography**

What government imposed barriers stop or hinder the export (out of the U.S) of automobiles?

*December 11, 2009*

**CRT 205**

Your critical thinking analysis will possibly change the way some of your past communication could have been expressed differently.

*November 26, 2009*

**Math**

I just do not understandthe concept of this can some one make it more simple for me to understand? Remove parenthesis and simpilfy its not just this one its the whole understanding thing. 8p+5q-9(8p-8q+9r) I got -72+67q-81r

*October 29, 2009*

**Math**

I just do not understandthe concept of this can some one make it more simple for me to understand? Remove parenthesis and simpilfy its not just this one its the whole understanding thing. 8p+5q-9(8p-8q+9r) I got -72+67q-81r

*October 29, 2009*

**Geography**

what activiteis affect the level of a countrys economic developement?

*October 18, 2009*

**Org. Chem.**

why is water and tetrachloride immiscible

*September 14, 2009*

**Math**

there are 3 angles in a triangle

*August 10, 2009*

**Algebra Word Problem Help**

A gardener has 40 feet of fencing with which to enclose a garden adjacent to a long existing wall. The gardener will use the wall for one side and the available fencing for the remaining three sides. If the sides perpendicular to the wall have length x feet, which of the ...

*August 8, 2009*

**Math Help Please**

Which of the following expressions is equal to log (x sqrt-y)/z^5 A. log x + log (1/2) + log y– log 5 – log z B. log [x + (1/2)y – 5z] C. log x + (1/2)log y – 5 log z d. [(1/2) log x log y]/(5 log z)

*August 3, 2009*

**Algebra**

Express as a single logarithm and simplify: 2 log 3 + log (3x) – log x

*August 2, 2009*

**Math**

It's ok, I see how this is the answer now! Thanks again for your help!

*July 7, 2009*

**Math**

Would this [-infinity, -2] and [1, infinity] be the same and equal (-infinity sign,-2, U(1,infinity sign)

*July 7, 2009*

**Math**

Please help! They are asking for 2 solution sets and I don't know where to start. Thanks in advance! Solve and write interval notation for the solution set. 3 – 8x < –5 or 3 – 8x > 19

*July 7, 2009*

**Algebra**

An area, A, consisting of the sum of two squares is 1000. The side of one square is 10 less than 2/3 of the side of the other square. What are the sides of the squares?

*June 30, 2009*

**Physics**

Do atoms have colors? What colors are they? Are they all the same color, or are all carbon atoms one color and all hydrogen atoms a different color for instance? Or are they the color of the object? Thanks for your help.

*June 10, 2009*