Wednesday
October 22, 2014

Posts by alejandro


Total # Posts: 83

physic30
A charged glass rod is brought close to an insulated metal rod. The rod is momentarily grounded and then the ground is removed. This method of charging is called charging by ______? There is 3 ways; by friction, by conduction, and by induction. I think is by friction! People ...
March 23, 2014

physics30
After performing a trick above the rim of a skateboard ramp, a 56 kg skateboarder lands on the ramp 3.5 m above ground level with a downward velocity of 4.0 m/s. Ep = 0.0 J Ground level. Friction in the wheels of the skateboard and air resistance cause a loss of 9.0 × 10...
March 10, 2014

physics30
A spring is compressed a distance of x. When the spring is released, it shoots a marble of mass m vertically upward from ground level. The maximum height reached by the marble is h. The magnitude of the marble’s momentum at the highest point of the marble’s ...
March 10, 2014

Science
Why do you think the national weather service has standard conditions for measuring air temperature?
January 27, 2014

Data Management
In a manufacturing process, it is estimated that only 2% of the bolts that are machined are declared defective, that is, they are either too large or too small. In a package of 50 bolts, what is the probability that there is at least one defective bolt?
January 21, 2014

Data Management
A kennel is to be enclosed with a 20m of fencing. The length of the kennel is to be an integer length and is to be chosen randomly. What is the expected area of the kennel?
January 21, 2014

Data Management
A game consists of cutting a shuffled deck of cards. If you cut a face card you win 10 cents. If you cut an ace you win 25 cents. If you cut anything else you lose a nickel. What is the expectation for this game?
January 21, 2014

Data Management
A random variable X is defined as the number of heads observed when a coin is tossed 4 times. Make a chart that shows the probability distribution for X. What is the expected value?
January 21, 2014

Data Management
A confident and boastful coach claims that on the next league game the odds of his team winning are 3:1; the odds against losing are 5:1; and the odds against a tie are 7:1. Can these odds be right? Explain.
January 21, 2014

Math - Data Management
What is the probability that there are at least two people with the same birthday in a class of 40 students?
January 21, 2014

marie g davis
bus route also throgh balmorhea which is 1/3 of the way from el paso to san antonio abaut how does it take the bu s to get to balmorhea. you can healp this homework is may son I do now undertand.
October 16, 2013

math30
Steve Looks thanks so much for your time but you are telling me the same questions without answer my question! don't worry!
August 7, 2013

math30
The number of cellular phone customers of a particular telephone company increased by an average of 40%/a from 1994 to 1998. If there were 963 300 customers on January 2, 1998, then the number of customers on January 2, 1994, to the nearest hundred, would have been Answer: ...
August 7, 2013

math30
Thanks, but what about the odd number?
August 5, 2013

math30
A security code used to consist of two odd digits, followed by four even digits. To allow more codes to be generated, a new system uses two even digits, followed by any three digits. If repeated digits are allowed, the increase in the number of possible codes is____ Answer: ...
August 5, 2013

math30
Reiny I just realized "even numbers" means not repeated. That help????
August 4, 2013

math30
Reiny I just realized "even meter" means not repeated. That help????
August 4, 2013

math30
The number of three digit or four digit even numbers that can be formed from the numbers 2, 3, 5, 7 is A.72 B.120 C.144 D.5040
August 4, 2013

math30
If loga(x + b) = c, then x is equal to where a is the base. a. x = a^c – b *this is the answer* why??
May 13, 2013

physic30
Changing Momentum The illustrations show two ways of providing impulse to change the momentum of a vehicle. In the top illustration, the vehicle collides with a massive concrete barrier. In the bottom illustration, the vehicle collides with water-filled barrels. *two ...
April 22, 2013

Physics30
Changing Momentum The illustrations show two ways of providing impulse to change the momentum of a vehicle. In the top illustration, the vehicle collides with a massive concrete barrier. In the bottom illustration, the vehicle collides with water-filled barrels. *two ...
April 11, 2013

physics
A police offer may warn that “speed kills.” In video games, high-speed crashes are common. Suppose a particular scene in a game required the following elements: • a high performance motorcycle must crash into a barrier and be stopped • a small scooter must ...
April 5, 2013

algebra
mark needs to make 15% sulfuric acid for a lab. how much sulfuric acid, and how much water does he need to use to make ^ liters of 15 % of sulfuric acid ?
February 18, 2013

algebra
Monique and Jackie start at the same spot and run in the same direction around a quarter mile track. Monique runs at a speed of 14mph, Jackie runs at a speed of 16mph . how long will it take for Jackie to laps monique? (Jackie runs 1 more lap than monique?)
February 18, 2013

math30
The Mean and the Standard Deviation Last year, golfers at Smith Ranch golf course had a mean score of 41 and a standard deviation of 2 on the first nine holes of the course, and a mean of 38 and a standard deviation of 1.8 on the last nine holes. One afternoon, Nathan scored ...
February 13, 2013

math30
1. Your city has 700 000 households, and the probability that a household has exactly one vehicle is 17/23. a) Determine the number of households that can be expected to have exactly one vehicle.
January 26, 2013

math30
1.To play a game, a die is rolled to see who plays first. Four players are going to play the game. What is the probability that at least two people roll the same number? Express your answer to the nearest tenth of one percent
January 26, 2013

math30
A committee is to be formed to investigate what activities teenagers have available in small communities. The committee is to have 7 members, chosen randomly from interested community members. There are 10 parents, 5 teenagers, and 4 adults without children who have all ...
January 25, 2013

math30
Children’s meals are being prepared for a large gathering. There is an equal number of chicken, hamburger, and fish meals. Each meal comes with a toy: a ball, a parachute toy, or a Frisbee. There are twice as many balls as Frisbees and an equal number of parachutes and ...
January 25, 2013

math30
what about the phase shift in radians?
November 20, 2012

math30
Find the amplitude, period, phase shift, and vertical displacement for: y=7sin5(x-85degrees)-1.2
November 20, 2012

math30
The equation of the hyperbola is (x-3)^2/4 - (y+1)^2/16 =-1. What is the range? All I know is this but I am not even sure what I am doing!! My answer: The general form of the equation of a horizontally aligned hyperbola is: (x-h)^2/a^2 - (y-k)^2/b^2 =1. So the (y-k)^2/b^2 term...
October 10, 2012

math30
Determine the sum of the following geometric series. Round your answers to 4 decimals if necessary. a) 50 over sigma k=1 8(.5)^k-2
September 26, 2012

math30
Write the first three terms of a geometric sequence that has a first term of a = 7 and a common ratio, r, that satisfies r2 = 9.
September 10, 2012

math30
Write the first three terms of the following geometric sequence: tn = 3(1/2)n-1.
September 10, 2012

math30
The sum of the first 10 terms of the geometric sequence -4, 6, -9,..., to the nearest tenth, is; The answer is: For the geometric series a=-4, r=-1.5 or -3/2, n=10. Sn= a(r^n - 1)/r - 1 S10= -4((-1.5)^10 - 1)/-1.5 - 1 S10= 90.7 My question is from where they got r=-1.5 or -3/2...
August 23, 2012

math30
A sequence has a first term of 24 and every other term is one half of the previous term. Find a recursive formula that defines this sequence. The answer of this question is: an=an-1*1/2 Somebody can help me and let me know why is 1/2 on the formula? please please!!! I am not ...
August 23, 2012

math30
A sequence has a first term of 24 and every other term is one half of the previous term. Find a recursive formula that defines this sequence. The answer of this question is: an=an-1*1/2 Somebody can help me and let me know why is 1/2 on the formula? please please!!!
August 22, 2012

math30
I am looking for help to find out if my answer is right or not! Thanks any way!!
August 8, 2012

math30
Sequences 1)A sequence has a first term of 24 and every other term is one half of the previous term. a)Write the first four terms of the sequence. b)Find a recursive formula that defines this sequence. c)Find an explicit formula that defines this sequence. This will be ...
August 8, 2012

math30
Solve log2(x-1) = 5-log2(x+3) for x. base 2.
July 25, 2012

math30
LOGARITHMS AND EQUATION SOLVING Solve for x. Round to the nearest hundredth. 2^(x+3) = 17^(x)
July 18, 2012

math30
The 1933 earthquake in Japan registered 8.9 on the Richter scale. a.The 1985 earthquake in Peru registered 7.7 on the Richter scale. How many more times intense was the earthquake in Japan? Round your answer to one decimal place. b. What would the Richter scale reading be of ...
July 11, 2012

math30
The formula for determining the pH of a solution is pH = -log[H+], where [H+] is the hydrogen ion concentration (in M/L). What is the hydrogen ion concentration of an acid with a pH of 2.5?
July 11, 2012

math30
The formula for determining the pH of a solution is pH = -log[H+], where [H+] is the hydrogen ion concentration (in M/L). What is the hydrogen ion concentration of an acid with a pH of 2.5?
July 10, 2012

math30
1.Use the laws of logarithms to express log2 (6) – log2 (3) + 2log2 (8)^1/2 as a single logarithm; then evaluate. 2. For logy = log(0.5x – 3) + log2, express y as a function of x.
July 10, 2012

math30
The mass of a radioactive sample is represented in the graph below. The initial mass of 32 mg decays to 8 mg after 21 hours. 1)What is the half-life of the radioactive sample, in minutes? 2)Solve each equation. a. 4 8x-1 = 8 b. 3^(2x-5) = 1/27x
July 3, 2012

math30
The growth of a $40 000 investment is shown in the table. Time (years) Value ($) 0 40 000 1 42 600 2 45 369 3 48 318 4 51 459 5 54 803 Use the exponential regression function on your calculator to get the function. Round a to the nearest dollar and b to the nearest thousandth ...
July 3, 2012

Algebra
2 people are going to cover their roof with cedar shingles. Their roof has an area of 2,025 square feet. The shingles they want to use come in bundles of 100 square feetand are only sold in full bundles. Each bundle costs $171.95. They will need to hire a trained specialist to...
May 7, 2012

books
Book: The Trouble with Lemons At the end of Chapter 16, a character says "it's harder to hate a guy when you see that he's got problems like everbody else." Who says this? Explain what is going on in the novel before, during, and after this is said.
November 14, 2011

physics
dont know :( help
November 12, 2011

Math
For the given problem simplify the expression. 1. 4d - 5 - 9d + 17 2.-8p - 12 + 7p - 11 3. 27 - 13t + 32 - 2t + 10t
November 7, 2011

physics
A railway flat car is rushing along a level frictionless track at a speed of 45m/s. Mounted on the car and aimed forward is a cannon that fires 65 kg cannon balls with a muzzle speed of 625m/s. The total mass of the car, the cannon, and the large supply of cannon balls on the ...
October 10, 2011

science
I want to figure out the rate of water absorption for different beans. How do I do that calculation? Is it weight of water absorbed over time?
October 6, 2011

ENDOCIRNE SYSTEM
HOW ENDOCRINE SYSTEM FUNCTION
September 13, 2011

art
Which artist chose graffiti for creative expression?
June 2, 2011

math
The disney Golf classic starts with 64 golfers. the golfes form pairs and each pair plays amtch. the losers drop out nad the winners of each pair then form new pairs and play again. Then those winners form pairs and play. this continues until there is one winner.. a- In how ...
May 1, 2011

Physics
Find the total electric force on a +q charge placed at x_0 due to the line charge and the point charge
April 12, 2011

Physics
If a +q charge is placed at d in the x-axis (x_0<d), what happens to the total electric field in 1?
April 12, 2011

Physics
Given a line of charge in the x-axis which exists the from a to b with a charge distribution of lambda(x)= Cx(X_o-x)^2, calculate the total electric field at x_o. (X_o, C, a and b are positive; a<b<x_o)
April 12, 2011

pre algebra
how do i solve systems? example- y=x-2 y=4x+1
March 14, 2011

CHEMISTRY
Complete these bronsted lowry reactions HS^- + H^+ ---> HS^- + OH^- ---->
February 4, 2011

Math
Steven has 9 gold coins that are identical in appearance. However, one coin is counterfeit an weighs slightly less that the others. Using a balance scale, how can he find the counterfeit coin in just two weighings?
November 28, 2010

College Algebra
Write a quadratic equation in the variable x having the given numbers as solutions. Type the equation in standard form, ax^2 +bx+c=0 The Solution is 7, only solution!
August 12, 2010

Literature
In the novel the color purple, the mayor buys a car for his wife Miss Millie. but then refuses to teach her how to drive it. was there a specific reason for that?
June 4, 2010

math
i want the answers to my homework
March 24, 2009

Plese Help
Well look were suppose to classyfy chemical equations which is the main point were doing then she wants us to name their name which that part im having a hard time and im not getting a tutor since i get straight A on all my classes
October 9, 2008

Plese Help
it only has a few
October 9, 2008

Plese Help
can you also help me out on the other ones please i dont have a clue on a website
October 9, 2008

Science, not
i dont get it what do you mean not science it is please find a website for me
October 9, 2008

Plese Help
IM sorry what i meant was their compounds hydrogen peroxide or carbon dioxide or fool's gold. 2HCL 2H2O 3NiBr2 2AlBr3 3Ni 3O2 2Al2O3 CaCl2 CaF2 AgNO3 KCl AgCl KNO3 2NH3 2H2O2 (NH4)2SO4 Ba(NO3)2 BaSO4 2NH4NO3 MgI2 Br2 MgBr SO3 H2SO4 6KCl Zn3(PO4)2 3ZnCl2 2K3PO4 or at least ...
October 9, 2008

Science
No thay said some of these i have to look up their names since i dont konw really SO3 means i think Sulfuric Oxide
October 9, 2008

Science
hey can you tell the compounds names NOT their element names. 2HCL 2H2O 3NiBr2 2AlBr3 3Ni 3O2 2Al2O3 CaCl2 CaF2 AgNO3 KCl AgCl KNO3 2NH3 2H2O2 (NH4)2SO4 Ba(NO3)2 BaSO4 2NH4NO3 MgI2 Br2 MgBr SO3 H2SO4 6KCl Zn3(PO4)2 3ZnCl2 2K3PO4 or at least find me a website to find their names
October 9, 2008

Algebra
linear equations is it a linear equation? 3x=5y i got yes since 0=5y-3x
October 2, 2008

Algebra
but then it cant be a linear function
October 2, 2008

Algebra
Sorry how do i graph this Y=-1
October 2, 2008

Algebra
Linear equations Y=-1
October 2, 2008

english language arts
can prepositions come at the end of the sentence
September 3, 2008

economics
whats up
September 3, 2008

Math
Find the unit vector that points in the same direction as the vector from the point P=(8,2) to the point Q=(5,9) Find vector PQ, then divide it by its magnitude.
April 16, 2007

math
Find the components of the vector from the point P=(8,-2) to the point Q=(5,9) You should really know how to do this if you are studying vectors. vector(PQ) = (5-8,9+2) = .....
April 16, 2007

Math
Find the components of the unit vector that makes an angle of 210 degrees counterclockwise with the positive x-axis (-√3/2,-1/2) which would be the same as (cos 210º,sin 210º)
April 16, 2007

math magic square
im in pre-ap what yo got
February 6, 2007

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