Wednesday
November 26, 2014

Posts by andrew


Total # Posts: 991

Math
If you toss a pair of dice 1,000 times, how many times would you expect to get a sum of 12 as the result? 1.)about 12 times 2.)about 27 times 3.)about 36 times 4.)about 100 times The lesson doesn't show me how to work this. Whats the formula?
January 7, 2011

American Government
Which of the following is NOT a key role of the President? to decide if laws are unconstitutional perform many ceremonial duties command all military offices during both peace time and during war responsible for executing the nation's laws I Think it's 3 or 4 not sure ...
January 5, 2011

American Government
Thanks!
January 5, 2011

American Government
Committees made up of members from both the House of Representatives and the Senate are called Question 18 answers 1.)standing committees. 2.)select committees. 3.)subcommittees. 4.)joint committees. I think it's either 2 or 4 not sure please help!
January 5, 2011

Math 157
no the girls can be arranged 9 different ways and the boys can be arranged 49 different ways
January 5, 2011

Math
2x - y = 4 6x - 3y = 7 (a) y = 2x - 4 (b)No solution (c)x = 2, y = -4 (d)x = 2, y = 5/3
January 3, 2011

Math
Solve each of these systems using the substitution method. Make sure to check your answers ! 2x + 3y = -4 x - 2y = 5 Question 1 answers x = 1, y = -2 x = -1, y = 2 x = 1, y = 2 x = -2, y = -1
January 3, 2011

science
what are 3 examples of selective breeding in plants
December 21, 2010

Math
m+8+2+n
December 20, 2010

Math
Simplify each expression. You may use the properties to help. When you type your answer, do not space between numbers and symbols. (4a)(5b)(6c)?
December 16, 2010

3rd grade math II
HOW CAN EXPLAIN WHY 975-492 = 583 IS REASONABLE ?
December 14, 2010

Physics
a person fires a rifle at a arget. the bullet leaces the rifle at 460 m/s and the person hears the bullet strike the target 2.00 seconds after firing it. the air temperature is 25.o celcius. what is the distance to the target?
December 12, 2010

Physics
a person fires a rifle at a arget. the bullet leaces the rifle at 460 m/s and the person hears the bullet strike the target 2.00 seconds after firing it. the air temperature is 25.o celcius. what is the distance to the target?
December 12, 2010

physics
what equation would you use if you wanted to find the net x-direction force on the box example: here is the problem... A box of mass 24.0 kg is subject to an applied force of 245 N with a depression angle of 31.2°, and it accelerates to the right. The horizontal surface ...
December 5, 2010

Pjysics Help!!!
An organ pipe is open at one end and has a length of 3 m. What is its fundamental frequency if the speed of sound is 336 m/s?
December 1, 2010

Math
Use the Gauss-Jordan method to solve the equation: 3x-5y-2z=-9 -4x+3y+z=11 8x-5y+4z=6
November 24, 2010

Science
sugar is a covalent compound
November 16, 2010

math
would the long side be 36 in?
November 16, 2010

math
Herman is making a small triangular table. If two of the sides will measure about 25 inches each, how many inches should the longest side (c) measure? Use the appropriate formula and round your answer to the nearest tenth. I don't know how to do this cuz it doesn't ...
November 16, 2010

Economics
Hi guys, I'm having a lot of trouble with this question. Maybe I should have paid attention more, too late now though. If anyone could help or point me out in the right direction, I'd really appreciate it! Thank you. Here is what the paper says "Your assignment is...
November 15, 2010

AP Chemistry
What is the equation for the standard enthalpy of formation for magnesium nitrate?
November 14, 2010

Physics
The answer is wrong. What did u get?
November 13, 2010

Physics
A 2.30 102 N force is pulling an 80.0 kg refrigerator across a horizontal surface. The force acts at an angle of 21.0° above the surface. The coefficient of kinetic friction is 0.200, and the refrigerator moves a distance of 7.00 m. (a) Find the work done by the pulling ...
November 13, 2010

chemistry
which of the following would form acidic,basic or neutral solutions:nh4f,nh4cn,nh4ch3coo,nh4cl,ba(ch3coo)2,nacn,caso4,cr(no3)3,fecl3,na2co3
November 11, 2010

Physics
2. A person exerts a perpendicular force of 75 N on a door. Calculate the torque on the door hinges if the force is applied a distance of 30 cm, 50 cm, and 75 cm from the hinge.
November 4, 2010

American Government
Haha never thought of it that way! Thanks!
November 4, 2010

American Government
Is this statement true: The Secretary of Defense could never become President.
November 4, 2010

Integrated math
A meteorologist tracked the increase and decrease of rain totals in inches from the previous year. This is the data for the following 4 months: January -1.34, February +2.68, March + 1.79, April -0.87. Estimate the change from the previous year by adding the totals rounded to...
November 3, 2010

CHEM. help please
2 H2O (l) → 2 H2 (g) + O2 (g) 1. Without doing any calculations, which side will enthalpy favor in this reaction? Entropy? 2. What volume of water in gallons would need to be split to store the same amount of energy as found in 10.0 gallons of gasoline? (Gasoline ...
November 2, 2010

chem
In a vehicle, H2 could be used in a fuel cell to generate energy. Hydrogen is not an energy source, but a means of transporting energy because the extraction of H2 from the logical source, H2O, takes as much energy as is returned when the gas is used. 2 H2O (l) → 2 H2 (g...
November 2, 2010

physics
an object is initially moving 15.0 m/s. a minute later, it is moving 25.0 m/s in the opposite direction. What is the displacement and acceleration?
October 31, 2010

Math Help Please
x=4.4
October 28, 2010

chem 101
using the unit conversion method derive an equation to calculate heat produced from the HCl-Na OH reaction
October 26, 2010

6th grade
What are the two similar features for long shore current and rip currents?
October 26, 2010

chem 101
how many grams of oxalic acid dihydrate to completely neutralize 25ml of 0.12 M of sodium hydroxide
October 18, 2010

physics
the string off of A
October 8, 2010

physics
no its on a flat surface with the static friction of .25. and W is hanging off the string at a 45 degree angle vertically.
October 8, 2010

physics
(a)block A weigh 60N. the coefficient of static friction between the block and the surface on which it rests is 0.25. the weight W is 12N and the system is at equilibrium. find the friction force exerted on block A. (b)find the maximum weight W for which the system will remain...
October 8, 2010

us history
Since the Constitution has been ratified, how many states have been admitted to the union?
October 8, 2010

physics
An elevator and its load have a combined mass of 1700 kg. Find the tension in the supporting cable when the elevator, originally moving downward at 13 m/s, is brought to rest with constant acceleration in a distance of 43 m.
October 7, 2010

physics
i have plugged in all the numbers and got .51 what do i do at this point???
October 5, 2010

physics
A block is hung by a string from the inside roof of a van. When the van goes straight ahead at a speed of 26 m/s, the block hangs vertically down. But when the van maintains this same speed around an unbanked curve (radius = 135 m), the block swings toward the outside of the ...
October 5, 2010

PHYSICS
thanks for the detailed explanation
October 5, 2010

chemistry
HBr is a molecular substance that is a strong acid in water. Write an equation for its ionization in water. Use minimal integer numbers to balance the reaction. Include physical states in your answer, e.g., start with HBr(l).
October 4, 2010

Chemistry
0.01L KHP * 0.445M KHP = 0.00445 molKHP KHP and NaOH are in 1 to 1 ratio so, moles NaOH = 0.00445 so, 0.00445mol NaOH/ 0.01154L NaOH = 0.386M NaOH
October 4, 2010

Physics
Ok thanks.
October 4, 2010

Physics
A bicycle wheel that initially spins at 3 revolutions per second is braked uniformly to a stop in 1 second. A spot is painted at the outer edge of the wheel. How many revolutions does the spot go during the time it takes the wheel to stop? The answer I got was 0.5 but was ...
October 4, 2010

math
What is the naming convention for a vector when two arrow point outward from a central point?
September 21, 2010

PHYSICS
F=Ma M =79kg a= 9.8ms^-2 (gravity) There is no other acceleration component since the aeroplane is at constant velocity so Force on pilot is... 79 x 9.8 = 774.2 N
September 21, 2010

Algebra
Sorry didn't see your second answer, great thanks a lot.
September 17, 2010

Algebra
I understand, your answer never mind. Thanks :)
September 17, 2010

Algebra
sorry don't understand
September 17, 2010

Algebra
100^0 one hundred to the zero power, would it be zero or one hundred?
September 17, 2010

math
32.5 - 45.8 please show steps!
September 17, 2010

math
x/7+5=10
September 17, 2010

physics
The left ventricle of the heart accelerates blood from rest to a velocity of +26 cm/s. (a) If the displacement of the blood during the acceleration is +1.9 cm, determine its acceleration (in cm/s2). (b) How much time does it take for the blood to reach its final velocity?
September 9, 2010

physics
The left ventricle of the heart accelerates blood from rest to a velocity of +23 cm/s. (a) If the displacement of the blood during the acceleration is +2.1 cm, determine its acceleration (in cm/s2). (b) How much time does blood take to reach its final velocity? in seconds
September 7, 2010

physics
A jetliner, traveling northward, is landing with a speed of 65 m/s. Once the jet touches down, it has 785 m of runway in which to reduce its speed to 5.0 m/s. Compute the average acceleration (magnitude and direction) of the plane during landing (take the positive direction to...
September 7, 2010

algebra
look at the algebraic equation that u posted previously. try to form an equation similar to that.
September 5, 2010

algebra 1
1. find a common multiple for the denominators of both fractions. 2. combine the fractions together. do not expand the numerator first. 3. cross multiply. 4. expand the terms 5. make x the subject. 6. solve.
September 5, 2010

Physics - Circular motion
A marble of mass m is placed on top of a bowling ball of radius r and allowed to roll from rest. derive the angle from centre of circle at which the marble loses contact with bowling ball. assume there is no friction between marble and bowling ball.
September 5, 2010

3rd grade
I am a number greater than 99 and less than 1,000. Two of my digits that aren't next to each other are the same. My tens digit could not be greater and it is 1 more than my hundreds digit. What number am I?
August 30, 2010

conversion problems
I don' know ask google
August 25, 2010

Math
What if the height of the water is only 15 cm, half the height of the hemisphere?
August 19, 2010

Physics (Static Friction)
divide by a 1000 your original answer is in N i believe also i would like to know how you solved this
July 28, 2010

British Literature
1. a 2. d 3. c 4. b 5. a 6. b 7. d 8. a 9. c i don't feel like doing any more. stop being so lazy
July 21, 2010

MATHS
to get the average do i add them all up and divide by the number of obsevations? say maths 646 divided by 14 = 46.1428 science 598 divided by 14 = 42.714 thanks
July 19, 2010

MATHS
oops sorry forgot the rest of the info: 14 students and their scores: MATHS 28 35 37 50 69 84 40 65 29 42 51 45 31 40 science 45 39 39 61 64 88 31 55 57 45 71 73 33 52 these are a random sample...... so if the kid gets 58 in maths how do you work out what his prdicted score ...
July 19, 2010

MATHS
if a student scores 58 in a maths exam predict the score they would get in science??? Have no idea where to start on this answer other than having a good guess!! Can anyone help please??? Thanks Andrew
July 19, 2010

Math
What is 34920421-98349238
July 14, 2010

Physics HELP
C)
July 14, 2010

FINANCE
1 million bottles at $1 a bottle is $1 million minus 50 cents a bottle is $500,000 minus $200,000 fixed costs per year is $300,000 minus $150,000 in taxes is $150,000 left plus 10% per year from the bank is $165,000 times 5 years is $825,000 made. I would do it.
July 14, 2010

math
Factor the expression: x to the 2nd power+3x+2?
July 13, 2010

chemistry
124 atm
July 7, 2010

Chem
f the molecular mass for a chemical is 352.04 g/mol and the enthalpy of formation is -2137 kJ/mol, the heat change will be ______ kJ when 10.0 g of this chemical is formed.
May 17, 2010

Chem
f the molecular mass for a chemical is 352.04 g/mol and the enthalpy of formation is -2137 kJ/mol, the heat change will be kJ when 10.0 g of this chemical is formed.
May 17, 2010

Math
Square Root of 5 plus 2 Square root of 2 over 4 minus the square root of 5 simplify
May 12, 2010

8th grade social studies
which of the followin is a power of the president???
May 10, 2010

algebra 2
What is the Domain and Range of the Radical Parent function
May 8, 2010

algebra 2
What is the Domain and Range of the Radical Parent function
May 8, 2010

Technology
I'm writing an essay, and the first page is a cover page. Obviously, there shouldn't be a number there. How do I get rid of it so that there's still numbers on the other pages?
May 4, 2010

Chemistry
Is it possible to determine the Ka of a weak acid at points other than the halfway point of a titration? Explain.
May 3, 2010

Chemistry
Find the pH experimentaly .1 ml before and .1 ml after the equivalence point if the experimental equivalence point was found to be at 35 ml. In this titration, you are titrating 0.500 M NaOH with 0.250 M HCl.
May 2, 2010

Chemistry
How do you solve for the experimental pKa when doing a titration?
May 2, 2010

Chemistry
If you have 0.100 M Pyridine titrated with 0.100 M HCl, choose an appropriate indicator and explain?
May 2, 2010

Algebra 2
Find the solution of the exponential form in terms of logarithms 2^(2x+13) = 3^(x-45)
April 30, 2010

Math
find the solution of the expontetial equation 1+7^(5x)=19
April 30, 2010

English
We were eating apples, bananas, and watermelon on Tuesday.
April 29, 2010

Geography
I was wondering if a plane flew west and kept flying, would it be possible for it to never fly into night if it didn't stop?
April 19, 2010

english
how do sonnets compare with modern day music and songs? its for a presentation
April 16, 2010

Biology
aerobic respiration?
April 7, 2010

Chemistry
If there were two solutions- one with areagent(100% pure) mixed in water and the other solution containing the same reagent (99.9% pure) mixed in equal volume of water. How significant would the difference in concentration be between these two solutions?
March 29, 2010

Physics
Hey I'm lost on this physics problem can anyone tell me which equations i'm suppose to use in these questions a) A skier inhales a breath of air at Temp-air = 3.9 ¢XC and exhales it as Volume-air = 1.92 liters of air at Temp-body = 37 ¢XC and atmospheric ...
March 27, 2010

CHEMISTRY
WHAT FACTORS ARE CONSIDERED TO BE STRESSES ON AN EQUILIBRIUM SYSTEM
March 26, 2010

Physics
1a. Two converging lenses, each of focal length 14.4 cm, are placed 60.6 cm apart, and an object is placed 26.9 cm in front of the first. Where is the final image relative to the second lens formed? b. What is the magnification of the system?
March 23, 2010

Math
What rate would it take to double an object valued currently at $100 in 6 years? I would like to know the answer and the equation/steps taken to solve the problem.
March 23, 2010

Nutrition
Why do sucrose-fed rats (high carb diet) consume less rat chow (protein, fat, fiber) than the control rats?
March 21, 2010

Chemistry
Determine the volume of a 0.550 M KMnO4 solution required to completely react with 2.55 g of Zn.
March 19, 2010

7th grade
37.5
March 18, 2010

math
What is the probability that exactly three children in a family of five children will be boys? Assume that P(boy)=P(girl)
March 9, 2010

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