Saturday
November 22, 2014

Posts by Zach

Total # Posts: 300

Social Studies
What four influences did Greece had on Roman culture?
April 2, 2010

College Chemistry
1) The concentration of the aluminum ion in a test solution is 0.10M. Using the Ksp for aluminum hydroxide (3. x 10^-34), calculate the concentration of hydroxide needed to precipitate aluminum hydroxide. From the concentration of the hydroxide, calculate the pH of the ...
April 1, 2010

Math
That's all the data I have.
March 30, 2010

Math
The rectangular prism has a height of 28 cm and holds exactly 360cm cubed. What is the length and width using the formula lwh?
March 30, 2010

Chemistry
If the yield from the reaction of acetic acid with isopentyl alcohol is 45% how many grams of isopentyl acetate are formed from 3.58g of acetic acid and 4.75g of isopentyl alcohol?
March 18, 2010

algerba1
simplify -x/4/6/x
January 10, 2010

algerba1
simplify -x/4/6/x
January 10, 2010

Algebra
The radius of a circle is increased by 85%. How much will the area increase in percent? Round your answer to the nearest tenth if a percent. I'm stuck on this question. Thanks -Zach
December 27, 2009

need help thank-you translate the verbal phrase into an inequality, then solve the inequality and graph your solution, the product of 6 and the difference of 6x and 3 is less than or equal to the product of -2 and the sum of 4 and 8x
December 7, 2009

algerba i
2(7n-1)> or equal 3(5-n)
December 3, 2009

Algebra 1
In how many ways can Abby, Bonnie, Chuck, Dennis, Ed and Fred line up at the water fountain so that the two girls, Bonnie and Abby, are not beside each other?
December 3, 2009

Algebra
The school that Trevon goes to is selling tickets to a choral performance. On the first day of ticket sales the school sold 12 adult tickets and 4 student tickets for a total of \$188. The school took in \$171 on the second day by selling 6 adult tickets and 9 student tickets. ...
December 3, 2009

Physics
A 60-cm-long, 500 g bar rotates in a horizontal plane on an axle that passes through the center of the bar. Compressed air is fed in through the axle, passes through a small hole down the length of the bar, and escapes as air jets from holes at the ends of the bar. The jets ...
November 30, 2009

Physics
A 5.50 kg cat leaps from the floor to the top of a 94.0-cm-high table. If the cat pushes against the floor for 0.220 s to accomplish this feat, what was her average power output during the pushoff period?
November 30, 2009

Physics
A 120 g ball moving to the right at 4.2 m/s catches up and collides with a 450 g ball that is moving to the right at 1.2 m/s. If the collision is perfectly elastic, what are the speed and direction of each ball after the collision?
November 30, 2009

physics
Two air-track carts are sliding to the right at 1.0 m/s and held together by a string. The spring between them has a spring constant of 140 N/m and is compressed 4.5 cm. The carts slide past a flame that burns through the string holding them together. Afterward, what are the ...
November 30, 2009

Physics
In a hydroelectric dam, water falls 26.0 m and then spins a turbine to generate electricity. What is ∆U of 1.0 kg of water? Suppose the dam is 80% efficient at converting the water's potential energy to electrical energy. How many kilograms of water must pass through...
November 30, 2009

Algebra word problem
A retailer of DVD players knows that at a price of q dollars per player, he can sell (900 – 3q) players per month. Write a polynomial, in function notation, that represents the monthly income from the sale of DVD players.
November 29, 2009

communications
The electronic version is just an on-line, web version of the same ad that is in print, such as in a newspaper.
November 21, 2009

Math
The perimeter of a rectangle is 34 feet and the area measures 60 square feet. What are the length and width of the rectangle? (Hint: Use the equations : perimeter = times the sum of the length and the width area = length times width)
November 21, 2009

Algebra 1
Marcus and Allen are playing Rock/Paper/Scissors. The first one to one 10 times does not have to do the dishes. The score is now 9 to 7 in favor of Marcus. If ties are ignored and not counted, what is the probabilty Marcus will not have to do the dishes? Express your answer as...
November 16, 2009

Pre Calc
I get where a comes from. Is the answer 53/-610? It doesn't seem right.
November 15, 2009

Pre Calc
Write a quartic function that has roots that are 3+5i, -4 and 7 and f(-3)=53. I have tried it a bunch of times and can't seem to get it. (x-3+5i)(x-3-5i)(x+4)(x-7) I multiplied them together x^4-9x^3+24x^2+66x-952 I was a little unsure what f(-3)=53 means. I thought I ...
November 15, 2009

Pre Calc (For Reiny)
Thanks so much your method worked perfectly! My solution was: the remaining zeros were 5+2i, 3, and -4 I have one question that's bugging me though, why is it that synthetic division did not work for me? I thought that long division and synthetic division were both ...
November 15, 2009

Pre Calc
I am familiar with this type of problem but can't seem to get the right answer. Use the given zero to find the remaining zeros of each function f(x)=x^4-9x^3+7x^2-91x-348,zero 5-2i I normally would use synthetic division with the root 5-2i bringing it down to x^3. Then ...
November 13, 2009

Pre-Calc Can't find where I went wrong
I tried to solve for H in the volume equation. so, 2=3.14(r^2)H divide 2 by 3.14=.64 .64=r^2H .64/r^2=H Not sure where to go from here
November 13, 2009

Pre-Calc help can't find the volume
How do I get the volume?
November 13, 2009

Pre-Calc
Is the volume 2L? How can I solve for diameter if I don't have the height?
November 13, 2009

Pre-Calc
Starkist tuna company will package tuna fish in 2-L cans. Find the radius and the height of the cans if the cans have a surface area which is less that 980 cm^2. I have no idea how to go about this, it seems like geometry to me. Can you give me some help? Please.
November 13, 2009

Algebra 1
x^2 + 16=0 Solve by graphing
November 12, 2009

Pre- Algebra
-6x-15>57 +15 +15 -6x>72 Divide both sides by -6 And switch sign because dividing the variable by a negative x<-12
November 12, 2009

Algebra 1
Thanks And I think you answered my question last time i posted, so thanks for keep on rollin' :)
November 12, 2009

Algebra 1
On a multiple choice test with 10 questions and 5 choices, A,B,C,D,E, for each questions, what are the odds of guessing on all 10 questions and getting 100%. State your answer as a common fraction. Thanks -Zach
November 12, 2009

Algebra 1
Mary's class took two tests last week. 80% of the class passed the math test, 90% of the class passed the English test, and 72% of the class passed both. What is the probablility that a randomly selected student in Mary's class failed both tests? Express your answer as...
November 5, 2009

math
3x^2-15x+18=0 -18 3x^2-15x=-18 square root 3x-15x=4.2426406871192851464050661726291 divide by 3 x-15x=1.4142165323730950488016887242097 divide by -15 x+x=-0.094280904158206336596779248280647 -x x=-0.094280904158206336596779248280647x
November 5, 2009

Physics-revision
those funky è letters are supposed to be theta. The funky ì is mu.
October 28, 2009

Physics
Okay, here is a solution. Not sure if it's the best one, but it seems to work. D = drag force D = (1/4)Av^2 v is terminal velocity A = 1.80m * 0.300m F(net) = D since there is no acceleration m*g*sinè - ì(kinetic)*m*g*cosè = (1/4)Av^2 solve for v (your...
October 28, 2009

Biology
How can I make a 3D model of a bone cell?
October 18, 2009

math
flexible rounding to estimate the answer 622+377= 84-27=
September 21, 2009

gr 4 math
we are working on number charts, I need to know what position pattrens means and what number pattren means? whats the difference?
September 14, 2009

math
A magician has 3 more red hats than black hats and 4 fewer purple hats than black hats and has 14 hatsin all. How many hats of each color does he have. Show how you got the answer.
September 14, 2009

Chemistry
The greater electronegativity difference bewteen two atoms bonded together, the greater the bond's percentage of ______ a. ionic character b. nonpolar character c.metallic character d.electron sharing Thank you!!!!
May 31, 2009

Chemistry
What does a covalent bond consist of? Thanks!
May 30, 2009

Chemistry
Which stage of ionization usually produces more ions?
May 27, 2009

spanish
dailey routine
May 3, 2009

Organic Chemistry
Does anyone know where I might find a step-by-step reaction mechanism for a polymer condensation reaction involving Hexamethylenediamine with Adipoyl Chloride (thus synthesizing Nylon 66)? If not, can anyone help list the steps that take place and why? Any help would be ...
April 26, 2009

Science
Predict what would happen to a reptile body temperature if the outdoor temperature increases by 10c.
March 16, 2009

english root word
factum - how do I use in a sentence. If it's a root word, are there any words with factum in them? I can't find any.
February 17, 2009

Algebra1
Hey, this helped me with my extra credit. Thanks :-)
February 17, 2009

Chemistry
How Many Molecules are contained in 0.25 moles of Fe?
December 11, 2008

Dynamath for October
iZachIsCool don't get it is hard I have to find the answers I am a teacher and I need them now I am at school and when I looked I did not get any answers can u tell me 😳
September 29, 2008

Chemistry
ΔT = T(mix) - T(initial) And the equations is: HCl(aq)+ NaOH(aq) => NaCl(aq) + H2O(l) And T(mix) = 37 C 50.0 mL of 2.0M HCl = 23.7 C 50.0 mL of 2.0M NaOH = 23.5 C How do I find T(initial), do I just use their averages? Thanks
September 29, 2008

Algebra 1
How many quarts of pure pineapple juice should Theo add to a 20% pineapple drink to create 5 quarts of 50% of pineapple juice mixture?
September 23, 2008

Chemistry
Calculate the DELTA H(rxn), DELTA S(rxn), DELTA S(universe), DELTA G(rxn). For each system below indicate whether DELTA S and DELTA H are positive or negative. Then indicate if the reaction is entropy driven, enthalpy driven or neither. C3H8(g) + 2O2(g) => 3CO2(g) + 4H2O(g)
September 19, 2008

biology
what are the forms in which carbon is found in the ocveans?
September 16, 2008

Alegbra
Show that the distance between the points (x,y) and the line Ax + By + C = 0 is: D = (Ax + By + C) / sqrt(A^2 + B^2) So, would you start out by multiplying sqrt (A^2 + B^2) to both sides and then it would become: sqrt (A^2 + B^2)D = Ax + By + C Then square both sides, D^2(A^2...
September 8, 2008

Ged Test Results
test scoring
July 29, 2008

earth
A word for ater that flows downhillafter it rains 6 letters
June 2, 2008

english
i need a sentence with the word "justice"
May 21, 2008

math
a farmer must get a mouse, a cat and a block of cheese across the river. He will make three trips. He can not leave the cat and mouse together on either side and he can not leave the mouse and cheese together on either side. How will he get them across the river?
May 19, 2008

Economics 101
Hey guys my Econ final is on Tuesday and I could use some help. These are 4 example questions true/false with explanation needed. 1. A monopolist will produce less and charge a higher price than a perfectly competitive industry. 2. Regardless of the type of price control, if ...
May 4, 2008

English
What are the differences between utopia and dystopia? What are some current real world references to utopia and dystopia?
April 25, 2008

Physics
A steel beam is used in the construction of a skyscraper. By what fraction L/L0 does the length of the beam increase when the temperature changes from that on a cold winter day (-20°F) to that on a summer day (+108°F)?
April 17, 2008

PHYSICS
Oil is flowing with a speed of 1.30 m/s through a pipeline with a radius of 0.315 m. How many gallons of oil (1 gal = 3.79 10-3m3) flow in one day?
April 14, 2008

English expression
The first one is correct. Because you don't have candy in a plate, you have it on a plate, and candy even though we know it is plural you would use "is"
April 2, 2008

college algebra
Let f(x)= x^5/120 - x^3/6 + x Find the local minima and maxima, then determine where the function is decreasing and increasing. Basically, I just need to know how to type this correctly in my calculator so I can get the right minima and maxima. I had: local minima: f(-1.59)=-1...
April 2, 2008

math
Determine whether the functions are even, odd, or neither. (a) f(x) = x²/√x²+ 1 (b) g(x) = x^3 - √ x- 7
April 2, 2008

french
Only with etre and reflexive verbs, do the subjects agree.
April 2, 2008

college algebra
Ok I started by diving by 12 to get x² + y² + 3/2y = 0 then x² + y² +3/2 + ____ = 0 + ____ then (3/2)² = 3/4 (3/4)² = 9/16 and got the equation x² + y² + (3/2)y + 9/16 = 0 + 9/16 here is where I am confused x² + [y+(3/4)]² = (3...
April 2, 2008

college algebra
Would you start by dividing everything by 6? then after that I am confused
April 2, 2008

college algebra
Identify the center and radius of the circles represented by the following questions (a) 3x² - √3x+3y²-y+ 1/12=0 (b) 12x² + 12y²+42y=0
April 2, 2008

chem
A sample of hydrogen has a volume of 1100 mL when the temperature is -0.899999999999999 degC and the pressure is 0.888 atm. What will be the volume of the gas at STP?
March 28, 2008

chem
A sample of fluorine has a volume of 3.6 L when the temperature is 112.3 degC and the pressure is 922 torr. What will be the volume when the pressure is 88.48 kPa and the temperature is 140.4 degC?
March 28, 2008

chemistry
A sample of chlorine has a volume of 2.5 L when the temperature is 84.1 degC. Assuming that the pressure is constant, at what temperature will the volume be 1750 mL? (Express your answer in Kelvins.)
March 28, 2008

Physics
During a tennis serve, a racket is given an angular acceleration of magnitude 155 rad/s2. At the top of the serve, the racket has an angular speed of 13 rad/s. If the distance between the top of the racket and the shoulder is 1.5 m, find the magnitude of the total acceleration...
March 26, 2008

Physics
You are installing a new spark plug in your car, and the manual specifies that it be tightened to a torque that has a magnitude of 45 N·m. Using the data in the drawing, determine the magnitude F of the force that you must exert on the wrench. Lenght of the wrench is ....
March 24, 2008

Physics
An automatic drier spins wet clothes at an angular speed of 4.8 rad/s. Starting from rest, the drier reaches its operating speed with an average angular acceleration of 3.6 rad/s2. How long does it take the drier to come up to speed?
March 6, 2008

Physics
A motorcycle has a constant speed of 24.0 m/s as it passes over the top of a hill whose radius of curvature is 129 m. The mass of the motorcycle and driver is 330 kg. Find the magnitude of (a) the centripetal force and (b) the normal force that acts on the cycle. I found the ...
March 5, 2008

Physics
The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. Assuming the earth is a sphere with a radius of 6.38 106 m, determine the speed and centripetal acceleration of a person situated...
March 3, 2008

Physics
A cyclist approaches the bottom of a gradual hill at a speed of 20 m/s. The hill is 4.4 m high, and the cyclist estimates that she is going fast enough to coast up and over it without peddling. Ignoring air resistance and friction, find the speed at which the cyclist crests ...
February 25, 2008

Physics
A cyclist approaches the bottom of a gradual hill at a speed of 20 m/s. The hill is 4.4 m high, and the cyclist estimates that she is going fast enough to coast up and over it without peddling. Ignoring air resistance and friction, find the speed at which the cyclist crests ...
February 25, 2008

Physics
Batman (mass = 90 kg) jumps straight down from a bridge into a boat (mass = 530 kg) in which a criminal is fleeing. The velocity of the boat is initially +20 m/s. What is the velocity of the boat after Batman lands in it?
February 25, 2008

physics
A 0.052-kg arrow is fired horizontally. The bowstring exerts an average force of 80 N on the arrow over a distance of 0.75 m. With what speed does the arrow leave the bow?
February 25, 2008

algebra
p=2l+2w solve for l
February 23, 2008

algebra
p=2l+2w forl
February 22, 2008

physics
A person pulls a toboggan for a distance of 40.0 m along the snow with a rope directed 15.0° above the snow. The tension in the rope is 69.0 N. (a) How much work is done on the toboggan by the tension force? (b) How much work is done if the same tension is directed ...
February 19, 2008

Physics
A 97.0-kg person stands on a scale in an elevator. What is the apparent weight when the elevator is (a) accelerating upward with an acceleration of 1.70 m/s2, (b) moving upward at a constant speed, and (c) accelerating downward with an acceleration of 1.80 m/s2?
February 18, 2008

electromagnetism
Why does the speed of wind have no affect on a homemade electromagnetic generator attatched to a windmill? I did an expiriment using a windmill and altered the wind speed 3-11mph. There was no change in the amount of amps genrerated. Are my results just wrong or is there a ...
February 11, 2008

Math -
PLEASE HELP ME FIGURE THIS PROBLEM! Solve equation and check the solution -3(r+5) = 3(r - 1)__________________
November 12, 2007

math
I have 5 pieces each is a triangle and they are supposed to somehow form a large triangle. Everyone has tried and we can't figure it out. I see lots of solutions online for 7 piece tangrams but nothing for a 5 piece. Thank you Zach I suspect there are 180 solutions to this...
August 10, 2007

algebra
evaluate the numerical expression 2 (14-7) + 5 Is the 2 supposed to be an exponent of something? Where does it go?
May 16, 2007

Physical Science
What are the 4 nuclear forces? Out of the 4 which one is the strongest and which one is the weakest? Thanks http://hyperphysics.phy-astr.gsu.edu/hbase/forces/funfor.html THANK YOU As a side note, these are not nuclear forces. They are the four fundamental forces in nature, ...
April 11, 2007

drivers ed
It is a crossword puzzle nine letters long. Vital to vehicle saftey
March 14, 2007

Why dogs are better than Cats!
shouldn't we just get over it and just finish this stupid debate
November 24, 2006

Algebra
-6h + 4 - 3 + h = 11 4-3-11=6h-h -10=5h -2=h
September 21, 2006

unscramble
afsedrniru
September 6, 2006

Science guys :)
hey guys a got a few problems i need help with im really desperate for help theyre due soon online :( 1.Suppose that a constant current of 89 mA flows in a conductor. Find the absolute value of the total charge that passes through the conductor in 3 minute(s). Charge = ______ ...
August 31, 2005

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