Sunday
October 26, 2014

Posts by Alex


Total # Posts: 2,643

physics
ok.. thanks c:
August 26, 2014

physics
Precision refers to the closeness of two or more measurements to each other... Accuracy refers to the closeness of a measured value to a standard or known value.... So would it be precise and accurate?
August 26, 2014

physics
sorry. not precise and not very accurate not precise but very accurate precise and accurate precise but not very accurate (i think its this one)
August 26, 2014

physics
You measure the mass of a 500 g standard on your balance four times. You get values of 455 g, 456 g, 454 g, and 455 g. Which of the following best describes your balance?
August 26, 2014

Chemistry
Calculate the maximun=m mass of ethanol that can be made from 5.6 tonnes of ethen
July 28, 2014

earth science
Which of the following is not an example of a mineral crystal shape? A. Pyrite B. Kryptonite C. Quartz D. Calcite i think its A am i right
July 26, 2014

Physics
A small charged sphere,A, carries 4 times the charge of another sphere B. When these are placed 4.5 cm apart, they experience a force of 0.016N attraction between them. Find the charge on B.
July 24, 2014

chemistry
How many milliliters of a 0.100 M NaOH solution are required to neutralize 25.0 milliliters of 0.150 M HCl? Select one: a. 25.0 ml b. 37.5 ml c. 125 ml d. 167 ml
July 24, 2014

physics
Fred and George who are identical twins (same body mass) are competing in aerial skiing. Fred hits the take off with a speed of 20 whereas George has a speed of 8.5. How much higher will Fred go?
July 20, 2014

Chemistry
What quantity of heat is required to convert 200g of ice at 0.00C into water at 50C? I know that im suppose to use the E=mc(Delta T) but im not sure how...
July 17, 2014

Algebra
The height of an object after it is released can be modeled by the function f(t)=-16t^2+vt+s, where t is the n? The height of an object after it is released can be modeled by the function f(t)=-16t^2+vt+s, where t is the number of seconds after the object is released, v is the...
July 7, 2014

algebra
Each person will have exactly the same amount over time because each invested $10,000 at an average interest rate of 7%. Tasha’s investment will yield more over many years because the amount invested at 8% causes the overall total to increase faster. Thomas’s ...
July 7, 2014

algebra
Tasha invests $5,000 annually at 6% and $5,000 annually at 8%. Thomas invests $10,000 annually at 7%. Which statement accurately compares the two investments if interest is compounded annually?
July 7, 2014

Algebra
thanks!!
July 7, 2014

Algebra
A toy rocket that is shot in the air with an upward velocity of 48 feet per second can be modeled by the function f(t)=-16t^2+48t , where t is the time in seconds since the rocket was shot and f(t) is the rocket’s height. What is the maximum height the rocket reaches? ...
July 7, 2014

chemistry
Yes I get it thanks Dr.
July 7, 2014

chemistry
Balance by oxidation method the SO2 + MnO4+H2O --MnSO4+H2SO4+SO4(-2)
July 7, 2014

Algebra
Evan washes two types of vehicles. It takes him 30 minutes to wash a car and 40 minutes to wash a truck. He charges $12 to wash a car and $15 to wash a truck. In 270 minutes, Evan made $105 washing cars and trucks. How many trucks did Evan wash?
July 4, 2014

algebra
A chicken farm orders bags of feed from two farmers. Store X charges $20 per bag, and store Y charges $15 per bag. The farm must obtain at least 60 bags per week to care for the chickens properly. Store Y can provide a maximum of 40 bags per week, and the farm has committed to...
July 4, 2014

Algebra
A sports memorabilia store makes $6 profit on each football it sells and $5.50 profit on each baseball it sells. In a typical month, it sells between 35 and 45 footballs and between 40 and 55 baseballs. The store has no more than 80 footballs and baseballs in stock during the ...
July 3, 2014

pre cal
what are the real and imaginary zeros of the equation 2x^3 + 5x^2 - 3x + 7
June 23, 2014

pre cal
f(x) = two divided by quantity x squared minus two x minus three Graph A coordinate axis scaled by one. Domain and Range : _____________________ x and y Intercept(s) : _____________________ Horizontal Asymptote(s) : ___________________ Vertical Asymptote(s) : ...
June 23, 2014

pre cal
Choose the point on the terminal side of -45°
June 23, 2014

math
Give an example of a rational function that has no horizontal asymptote and a vertical asymptote at x = 1.
June 23, 2014

algebra
There are 5 red marbles for every 25 blue ones. How many red marbles are there in a group of 600 marbles?
June 23, 2014

Highcschool
Which one of the characters you read about is 12 years old? A. The narrator’s daughter in “The Yellow Wallpaper” B. Ginger Nut in “Bartleby” C. Lily Dyer in “A New England Nun” D. The son of the old man in “The Tell-Tale Heart
June 15, 2014

Math
Action Video rents only action and horror films. Over one 7 day period, they rented 5 horror films for every 9 action films. If they rented 99 action films, what was the mean number of films they rented per day?
June 13, 2014

geometry
Thanks for your help Reiny.
June 11, 2014

geometry
In a triangle, the measure of the first angle is four times the measure of the second angle. The measure of the third angle is 84 degrees more than the second angle. what is the measure of the first angle?
June 11, 2014

high school algrebra 1
Thank You!
June 10, 2014

high school algrebra 1
A youth group is planning a trip to a local amusement park. They are taking a van which holds 10 people. It will cost $25 for parking and tickets to enter the park are $18 per person. create an equation for this situation
June 10, 2014

History
When did the US pull out of the Vietnam War? Some sources say 1973 and then others say 1969..?
June 8, 2014

Chem
Complete and balance the reaction of A) (CH3)2NH(aq)+CH3COOH(aq)→ B) CH3CH2NH2(aq)+HBr(aq)→ C) CH3NH2(aq)+HCOOH(aq)→
June 2, 2014

Chemistry!!
Complete and balance the reaction of A) (CH3)2NH(aq)+CH3COOH(aq)→ B) CH3CH2NH2(aq)+HBr(aq)→ C) CH3NH2(aq)+HCOOH(aq)→
June 2, 2014

Physics
A rock is thrown directly upward from the edge of a flat roof of a building that is 56.3 meters tall. The rock misses the building on its way down, and is observed to strike the ground 4.00 seconds after being thrown. Take the acceleration due to gravity to have magnitude and ...
May 27, 2014

physics
What about how far it has traveled in the time
May 20, 2014

Algebra 2
find the exact value of cos 300 degrees.
May 19, 2014

Physical Science
Thank you both very much!
May 13, 2014

Physical Science
The specific heat of copper is 0.385 J/g.°C. Which equation would you use to calculate the amount of heat needed to raise the temperature of 0.75 g of copper from 7°C to 29°C? a. Q = 0.385 J/g.°C ` (29°C 7°C) b. Q = 0.75 g ` 0.385 J/g.°C ` 29°C ...
May 13, 2014

Java Programming
Oh and ull need to format it, i dont think it will be formatted from here.
May 12, 2014

Java Programming
JUST COPY PAST TO ECLIPSE (OR WHATEVER ELSE U USE) I KNOW THIS WAS POSTED LIKE A WEEK AFTER BUT I DID THIS MOSTLY TO PRACTICE, HOPE IT WAS USEFULL import java.util.Scanner; public class Array { public static void main(String[] args) { //JUST GETTING SOME INPUT FIRST System.out...
May 12, 2014

Chemistry
Calculate molarity of HNO3 please help? Calculate molarity of HNO3 prepared by dissolving 22.3 grams of HNO3 in water to make 875 ml of solution... Please help I'm stuck
May 8, 2014

Math
Can you please help me with this one!! Solve by elimination, 3x+6y=6, 2x-3y=9
May 1, 2014

Math
Solve by elimination: 5x+7y=77 , 5x+3y=53 can you please help me out step by step so I can understand it on my own, thanks.
May 1, 2014

Physical Science
Which of these cannot increase the strength of an electromagnet? a. making the loops smaller in the coil b. placing an iron bar in the coil c. winding more loops in the coil d. increasing the current in the coil
April 29, 2014

Chemistry
A reaction : A(aq)+B(aq) --> C(aq) has a standard free-energy change of –4.01 kJ/mol at 25 °C. What are the concentrations of A, B, and C at equilibrium if, at the beginning of the reaction, their concentrations are 0.30 M, 0.40 M, and 0 M, respectively? I used ...
April 28, 2014

chemistry
hi
April 27, 2014

chemistry
estimate the mass of BaSO4 that will be produced when a 100ml of a 2M solution of Ba(NO3)2 in water is added toa 100ml of a 2M solution of NaSO4 in water
April 27, 2014

physics
a certain hamornic motion has amplitude of 0.7m and a period of 1.3s.find(a)the frequency of oscillation(b)the maximum velocity(c)the maximum acceleration
April 23, 2014

Physics 1
A cart with mass 340 g moving on a frictionless linear air track at an initial speed of 1.5 m/s undergoes an elastic collision with an initially stationary cart of unknown mass. After the collision, the first cart continues in its original direction at 0.42 m/s. (a) What is ...
April 22, 2014

Econ
The process that produces Sonora Bars (a type of candy) is intended to produce bars with a mean weight of 55 gm. The process standard deviation is known to be 0.77 gm. A random sample of 49 candy bars yields a mean weight of 55.82 gm. Find the test statistic to see whether the...
April 22, 2014

Physics
A police car stopped at a set of lights has a speeder pass it at 100 km/h. If the police car can accelerate at 3.6 m/s2, a) how long does it take to catch the speeder? b) how far would the police car have to go before it catches the speeder? c) what would its speed be when it ...
April 21, 2014

Algebra 1
4 pencils and 5 pens cost $2.00; 3 pencils and 4 pens cost $1.58. Write out a system of equations that would represent this situation.
April 18, 2014

English
Ok
April 16, 2014

English
Which description would not apply to a typical metropolis ? A. Bustling B. Crowded C. Large d. Rustic I think it's is A
April 16, 2014

English
Ok I will do that now so I am thinking it A
April 16, 2014

English
A word closely associated with altercation is ? A. revision B. Adherent C. Sensible D. Argument I think it is letter B is that right ? Please answer me
April 16, 2014

English
Ok
April 16, 2014

English
I meant its A
April 16, 2014

English
An invincible team is one that has never know ? A. The joy of victory B. The agony of defeat C. The fear of flying D. Injury or illness I am thinking it could be letter D
April 16, 2014

english/vocabulary
Look back at "failing infrastructure" write a letter to your state representative describing an infrastructure problem in your community and urging swift action. thoroughly describe the problem and it's solution, explaining why it is vital to take action ...
April 15, 2014

english/vocabulary
ok thank you so much for you help i real appreciate it
April 15, 2014

english/vocabulary
can you please help me on word study with writing with idioms ? 1. sick as a dog 2. the best of both worlds 3. under the weather 4. nest eggs 5. when pigs fly 6. slip through the cracks 7. go to seed 8 . thorn in your side 9. turn over a new leaf 10. fifth wheel 11. pitch in ...
April 15, 2014

MATH
THANK YOU FOR HELP ME SO MUCH ON MY HOMEWORK I REAL appreciate it
April 15, 2014

math
you were right i thought so that's why i wrote to you .
April 15, 2014

math
how can you solve this problem ? here X=Y plz help me fast
April 15, 2014

physics
A thin, uniform rod is hinged at its midpoint. To begin with, one-half of the rod is bent upward and is perpendicular to the other half. This bent object is rotating at an angular velocity of 7.1 rad/s about an axis that is perpendicular to the left end of the rod and parallel...
April 8, 2014

Physical Science
13. Why can convex mirrors only produce virtual images? Sadly, I can't find this answer in my book. :( Any help would be appreciated, please and thank you!
April 6, 2014

Math help
A catapult launches a boulder with an upwark velocity pf 184 feet per second. the heigh of the boulder in feet after t seconds is given by the function h(t)=-16t^2+184t+20. how long does it take the boulder to reach its maximum height? What is the boulders maximum height? ...
April 2, 2014

Word problem
Mrs sue or Damon am I correct?
April 2, 2014

Word problem
. A catapult launches a boulder with an upwark velocity pf 184 feet per second. the heigh of the boulder in feet after t seconds is given by the function h(t)=-16t^2+184t+20. how long does it take the boulder to reach its maximum height? What is the boulders maximum height? ...
April 2, 2014

Equations
How many real number solutions does the equation have y=3x^2+18x+27 none one two infinite
April 2, 2014

Equation help 2 questions
Mrs sue can you help me with question 2?
April 2, 2014

Equation help 2 questions
is number 1 none?
April 2, 2014

Equation help 2 questions
How many real number solutions does the equation have y=-4x^2+7x-8 none one two infinite How many real number solutions does the equation have y=3x^2+18x+27 none one two infinite Thank you!
April 2, 2014

Equation help
can someone help?
April 2, 2014

Equation help
A physics student stands at the top of a hill that has an elevation of 56 meters. he throws a rock and it goes up into the air and then falls back past him and lands on the ground below. The path of the rock can be modeled by the equation y=0.04x^2+1.3x+56 where x is the ...
April 2, 2014

UCF
What will be the change in enthalpy when 100.0 g of butane, C4H10, is burned in oxygen as shown in the thermochemical equation below? 2 C4H10(l) + 13 O2(g) → 8 CO2(g) + 10 H2O(g) ΔH = −5271 kJ −2636 kJ −4534 kJ −9087 kJ −1.817 × ...
April 2, 2014

trig
a hot air balloon climbs continuously along a 30° angle to a height of 5,000 feet. To the nearest tenth of a foot, how far has the balloon traveled to reach 5,000 feet? Draw a sketch and then solve.
April 1, 2014

Geometry
I need help!!! a hemispherical bowl with radius 25cm contains water whose depth is 10cm. what is the water's surface area
March 31, 2014

US history
Would question 4 be B instead?
March 30, 2014

US history
True False The divorce rate in America declined in the 1920s. false right? All of the following were anti-modern reactions except A.fundamentalism B. Ku Klux Klan C. cultural anthropology D. arts and crafts movement E. prohibition F. None of the above Is it D? Fundamentalists ...
March 30, 2014

Math 110
I don't understand how you got 2016. I understand how you added to get the 1,9, 11, and 6. But I do not understand where you got the 1->2, 9->0, and 11->1.
March 30, 2014

DATABASE.PLEASE!!
CAN ANYONE DIRECT ME HOW TO EXTRACT A BUSINESS RULE AND RELATIONSHIP FROM THIS PARAGRAPH.? *I KNOW ITS MANY TO MANY RELATIONSHIP. BUT I STILL HAVE PROBLEM TO COMPLETELY BREAK THE RELATIONSHIP DOWN TO ONE TO MANY. PARAGRAPH: Students will also be required to sit for many tests...
March 30, 2014

Geometry
I need help in this problem: A 14-foot ladder is leaning against a house so that its top touches the top of the wall. the bottom of the ladder is 8 feet away from the wall. which of these can be used to find the height of the wall? A. in a right triangle with 14-foot leg and ...
March 27, 2014

Chemistry
The measured potential of the following cell was 0.1776 volts: Pb|Pb2+(??M)||Pb2+(1.0M)|Pb Calculate the electrode potential of the unknown half-cell(anode). Not sure how to approach this, considering the molarity is unknown. There isn't a lot of space on the page for the ...
March 27, 2014

Equation help
Anyone?
March 27, 2014

Equation help
X^2-6x+7=0 1.-1.59,4.41 2.-1.59,-4.41 3.1.59,-4.41 4.1.59,4.41 Can someone help?
March 27, 2014

Equations Help
is this the answers for both of them?
March 26, 2014

Equations Help
ok I get that one
March 26, 2014

Equations Help
how many real number solutions are there to the equation y=5x^2+2x-12 how many real number solutions are there to the equation y=3x^2+18x+27 Can somebody tell me how to get the solutions?
March 26, 2014

Algebra
The length of a rectangle is 5 meters more than its width. The perimeter is 66 meters. Find the length and the width of the rectangle
March 25, 2014

Trigonometry
rewrite tan(sin^-14v) as an algebraic expression in v
March 25, 2014

Physics
A 5.1- kg concrete block rests on a level table. A 3.4- kg mass is attached to the block by a string passing over a light, frictionless pulley. If the acceleration of the block is measured to be 1.3 m/s2, what is the coefficient of friction between the block and the table? ...
March 24, 2014

trigonometry
how far from an 84 foot burning building should the base of the fire truck ladder be placed to reach the top of the building at an angle of 60 degrees with the ground. the ladder is mounted to the truck 8 ft off the ground
March 23, 2014

Science
In your own words, describe the mathematical process of converting from one metric unit of length to another.
March 20, 2014

math
an instructor makes $15 more per hour than an assistant. If the combined hourly wage of the instructor and assistant is $65 , what is the hourly wage of the assistant?
March 20, 2014

math
an instructor makes $15 more per hour than an assistant is $65 what is the hourly wage of the assistant ?
March 20, 2014

algebra 1
At Jack's Laundromat, 6 of the washers must be replaced. These washers represent of the total number of washers. If w represents the total number of washers, which equation could be used to determine the value of w?
March 20, 2014

Criminal investigation
thank you
March 20, 2014

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