Sunday
April 26, 2015

Posts by Zach


Total # Posts: 335

math
I would set up a proportion meters 1 x ---- --- --- scale 2.5 100 (% means out of a hundred) Since 25 x 40 = 100, then 1 x 40 = 40 The bridge is 40m long.
October 6, 2010

Math-Algebra
3|x+5|<= 6 |3x+15|<= 6 -15 -15 |3x| <= -9 /3 /3 x <= -3 Yes, you are correct.
October 6, 2010

algebra
You need to set up the proportion Base 6.5m 4m ---- ---- ---- Length 3.7m e Then you cross multiply: 6.5xe=6.5e 4x3.7= 14.1m So therefore, 6.5e = 14.1m Then divide both by 6.5 to get what e equals. 6.5e/6.5 = e 14.1/6.5 ≈ 2 so e ≈ 2.
October 6, 2010

Teacher Aide
Test scoring
September 30, 2010

math
Is this a star polygon, a polygon, or other, how many sides does it have? {9/3}
September 20, 2010

math
A roulette wheel has 18 red slots and 18 black slots numbered alternaetly with the numbers 1 through 36. Two green slots are numbered 0 and 00. The winning number is determined by the slot into which a single marble rolls. Players are not allowed to bet on green. The house ...
September 18, 2010

algebra
1/3(x+3)+1/6(x-6)=x+3
June 7, 2010

Math
When a survey of 800 people was done, 55% of those surveyed said they ate candy, 65% said they ate chips and 90% said they ate hot dogs. What is the smallest possible number of people who said they ate candy, chips and soda? -Zach
May 26, 2010

math
20 divided 2 minus 24 divided by 3 equals ? No parenthesis
May 24, 2010

Math
The side lengths of a right triangle are each an integral number of units. If one of the legs is 13 units, what is the perimeter of the triangle? Thanks ~Zach
May 20, 2010

Math
Six pipes each having a radius of 0.5 feet are stacked in a triangular pile with three pipes on the ground tangent to each other, two in the next row and one on top. What is the height of the pile. Express you answer in simplest radical form
May 13, 2010

algebra
Graph the linear equation. -3x + y = -6
May 5, 2010

math
Graph the linear equation. -3x + y = -6
May 5, 2010

Math
Thank you
May 4, 2010

Math
A large tank contains 400-kg mixture of water and alcohol. The mixture is 64% alcohol by weight. At each step, 100 kg of the mixture will be drained from the tank, replaced with 100 kg of water and then stirred. After three steps, what percent of the final solution will be ...
May 4, 2010

alegbra
Simplify: 5-3[2(3x-4)+3]
April 29, 2010

math
Simplify 5-3[2(3x-4)+3]
April 29, 2010

math
thank you jen
April 28, 2010

math
m+1 --- 4 + 5 -- 6 = 2m-1 ---- 12
April 28, 2010

algebra
Please help me! Sorry there are 4 questions I need to check my attempts with to see if I am on track. Thanks!! 1. 5-3[2(3x-4)+3] 2. Evaluate when x = -3 and y = 2 3x squared - 4y squared _______________________ 4x - 7y 3. -3/4y = -24 4. m + 1 5 2m - 1 ______ + ___ = ______ 4 6 12
April 28, 2010

algebra
Please help me! Sorry there are 4 questions I need to check my attempts with to see if I am on track. Thanks!! 1. 5-3[2(3x-4)+3] 2. Evaluate when x = -3 and y = 2 3x squared - 4y squared _______________________ 4x - 7y 3. -3/4y = -24 4. m + 1 + 5 = 2m - 1 ______ _ _______ 4 6...
April 28, 2010

9th grade - Civics
I'm doing a crossword. The question is what is the term to "postpone a sentence/fine?" It starts with an R_ _ _ I _ _ _. Thought it was suspend but this isn't right. Any help is great
April 28, 2010

math
Thank you very much Reiny!
April 27, 2010

math
2(x-5)+3x < 4(x-6)+1
April 27, 2010

9th grade Algebra
go to hell!!!
April 25, 2010

math
Thank you so much Reiny.
April 21, 2010

math
With income earned by selling the rights to his life story, an actor invests some of the money at 3% and 30,000 more than twice as much at 4%. The total annual interest earned from the investments is $5600. How much is invested at each rate?
April 21, 2010

Math
How many positive three-digit integers have the property that the tens digit is greater than or equal to the hundreds digit and the ones digit is greater than or equal to the tens digit? Please help :) thanks -Zach
April 21, 2010

math
Thank you so much Reiny.
April 14, 2010

math
The value of a "Mint State-63" 1950 Jefferson nickel minted at Denver is 8/7 the value of a 1945 nickel at Philadelphia. Together, the total value of the two coins is $15. What is the value of each coin?
April 14, 2010

Math
1/2 dozen eggs is 6. If 1/3 of 6 gets broken, it means 2 broke. 4 are not broken. If I understood the question correctly, this should be the correct answer.
April 5, 2010

algebra
Thanks so much Reiny!
April 5, 2010

algebra
6/7S - 3/4 = 4/5 - 1/7S + 1/6
April 5, 2010

Social Studies
I don't get it, so the four influences that Greece had on Roman culture are art, religion, mythology, and the Latin alphabet?
April 2, 2010

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

8th grade
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
Thanks
November 5, 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

6th grade Social Studies
your mom
December 15, 2008

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

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