Thursday
October 2, 2014

Posts by alex


Total # Posts: 2,610

alegebra 2
12x+20y+15z=-60
January 17, 2011

alge2
12x+20y+15z=-60
January 17, 2011

math
0.5x+2=0.2x-7 lost !!!!!!!!!!!!!!!
January 16, 2011

Statistics
The heights of the students in a statistics class are approximately normal with mean 68 inches and a standard deviation of 2.75 inches. Suppose that the heights of the 15 male students in the statistics class are also approximately normal with mean 71 inches. Would the ...
January 15, 2011

Pre Calc
The half-Life of radioactive earthium is 2651 years. Find how many years it will take 100 grams of earthium to decay to 10 grams. I know the equation is A=Ae^(-rt) I tried working it out but I think I am doing it wrong. I did 10=100e^(-r*2651) Can anyone help? Thanks a lot
January 13, 2011

English
Hey guys, I was just wondering if you could help me find or explain to me media influence in the Hunger Games. I know this is a big part of the story, but I really need clarification. Thanks a lot guys!
January 13, 2011

Social Studies
Here are some questions i need help on. Ture or False 1.Grmans came from an area of Germany that had been devastated during a numder of wars. 2.Quaker women parted fully in religious affairs.
January 13, 2011

Conductivity
YEA UCI chem lab where 2units > 4 units
January 12, 2011

science
what would happen if inertia was the only force being acting on the earth?
January 12, 2011

math
Buses to the stadium leave Central Station every 10 minutes. Buses to the zoo leave Central Station every 16 minutes. Both buses leave Central Station at 8 p.m. Find the next time both buses will leave Central Station at the same time.
January 11, 2011

math
Three brothers divide 17 candy bars. The oldest child gets 1/2, the middle child 1/3, and the youngest child 1/9. So that they do not have to cut any bars, Mom provides an extra one. The oldest chidl then takes 9 candy bars, the middle child 6, and the youngest 2, and they ...
January 11, 2011

trigonometry
Can you add 1 to the sqrt of 2 . Or was that the final answer.
January 10, 2011

trigonometry
Thank you soo much.
January 10, 2011

trigonometry
Using exact values,find the value of: (A=30degrees) sin 2A + tan 3A/2 - cos A + sec(A+15), when A= 30degrees There were no parentheses and no exponents. please help by showing the work in details. Thank you! I pluged in the numbers and got this I dont know if its right or ...
January 10, 2011

trigonometry
thanks !
January 9, 2011

trigonometry
this is exactly how the question is written and i tried to solve it but i just couldn't. Can u please show me how the work was done I dont want just the answer. using the exact values,find the value of: 12 sin 30degrees - 6 tan of 45 degress + sec 45 degrees / 52. please ...
January 9, 2011

algebra
ohhh I see what I did wrong Thanks you 2
January 9, 2011

algebra
So is the answer 6sqrt(5)?? Thank you
January 9, 2011

algebra
sqrt(45)+ sqrt(20)+ sqrt(5)-sqrt(125)=?? I came up with 6sqrt5 I know it's wrong. I think I messed up the breakdown of the sqrt of 125
January 9, 2011

math
correction ab+b=3a-d
January 9, 2011

math
But the answer is 120. I have the answers to those questions. I just need to know topics they are included in so I can study.
January 9, 2011

math
What type of math is this? 25% of what is 30? and solve for a: ab=b=3a-d
January 9, 2011

Calculus
Find the dimensions of teh rectangle with the most area that will fit above the x-axis and below the graph of y=e^-x^2. Please show with every step. Thanks.
January 3, 2011

Calculus
You are given a 60 inch by 30 inch piece of cardboad and asked to make a six-sided box. If the cardboard is cut along the lines shown, what will the dimensions of the box with maximum volume? The diagram looks as follows: it is a rectangle with a shaded square in the top left ...
January 3, 2011

Calculus
Can you show me the steps you skipped? Thanks
January 3, 2011

Calculus
Find the dimensions of teh rectangle with the most area that will fit above the x-axis and below the graph of y=e^-x^2.
January 3, 2011

Calculus
it is a rectangle with a shaded square in the top left and bottom left corners.....there is a shaded rectangle in the top right corner and bottom right corner....there is a shaded square to the left of the rectangle in the top right corner and the bottom right corner....in ...
January 3, 2011

Calculus
You are given a 60 inch by 30 inch piece of cardboad and asked to make a six-sided box. If the cardboard is cut along the lines shown, what will the dimensions of the box with maximum volume?
January 3, 2011

Biography
What was Louis Armstrong's goals?
January 1, 2011

organic chemistry
Because acyl group is a ring-deactivating and decreases the electron density.
December 29, 2010

Adult education- child care development
Sure.Why not? Why wouldn't it be appropriate?
December 26, 2010

Physics
On a recent trip to a water park, you notice there is a new slide that you ride down a steep hill, then it carries you back up another ramp and shoots you into a pool. All the kids around you are saying that you leave the ramp at 50 m/s. If the initial height of the slide is ...
December 21, 2010

math
how can i fine the volume of 17cm 13cm 10cm
December 19, 2010

algebra
simplify: sq rt of 15/5 * sq rt of 20
December 18, 2010

AP Physics
A cowboy at a dude ranch fills a horse trough that is 1.7 m long, 50 cm wide, and 40 cm deep. He uses a 1.9 cm diameter hose from which water emerges at 1.3 m/s. How long does it take him to fill the trough? min
December 16, 2010

science
2H2(g) + O2(g) = 2H2O (l) Calculate the volume of Hydrogen gas at STP required to produce an amount of energy equivalent to that produced by the combustion of a gallon of octane. The density of octane is 2.66 kg/gal, and its standard enthalpy of formation is -249.9 kJ/mol. ...
December 15, 2010

math 3rd grade
Multiples of 10 can also be multiples of 5 because 5 can "go into" 10 easily, so is the same for other multiples.
December 14, 2010

2nd grade
So, which words are showing possession? Valentine's and Charlotte's, right?See, it is Valentine's Day,(The day BELONGS to Valentine, and it is Charlotte's Web, and the web belongs to Charlotte.) Understand?:)
December 13, 2010

Gr. 9 Math (continued)
O_O
December 12, 2010

US History
did you get rid of the spaces? I only put them because the website wouldnt let me put it on. It's a picture of a girl clinging to a gate nd she looks sad
December 10, 2010

US History
I need to do a poster thats for teen suffrage and I wanted to use this: h t t p : / / c d n . w n . c o m / p h / i m g / 3 0 / c a / e f 1 c 4 8 d 1 3 2 f d 1 c 1 6 0 5 b b 9 3 d 2 5 2 7 8 - g r a n d e . j p g or something like this. Would this be a good poster? I also need ...
December 10, 2010

OCHem
The amount of methylcycloheane with the substituent in the equatorial orientation at room temperature (25C) would be The Gibbs free energy for axial methyl to equatorial methyl is -7.28Kj/mol (the universal gas constant is 8.314 j/deg-mol). I cant remember how to solve this...
December 10, 2010

computer science
If all the hub and authority scores are initialized to 1, what is the hub/authority score of a node after one iteration? In the preceding discussion we encountered two recommended “hard constants” – the increment on te being ten times the last fetch time, and ...
December 10, 2010

chem
AgNO3 + NaCl produces AgCl + NaNo3 how much AgCl is produced when 3.10g of AgNO3 and .600g of NaCl react?
December 8, 2010

physics
5. A truck is travelling at a constant velocity of 16.7 m/s. A pumpkin is shot vertically (at a 90o angle to the ground)at a velocity of 120. m/s from the bed of a this pickup truck. The bed of the pickup truck is one meter high (from the ground). Complete the following ...
December 7, 2010

5th grade
how much would a trapizoid worth if the triangle eqauls 1/3
December 7, 2010

Physics
I get it now......Thanks alot.....
December 5, 2010

Physics
no....sorry I forgot to mention, the angle is 20 degree.....
December 5, 2010

Physics
I don't know.....it's written like that in the book...... It's being pushed up....... the answer is 12.9m/s.....But I dun know how to calculate it......
December 5, 2010

Physics
A block of mass 0.5 kg rests on a smooth inclined plane. It is then pushed by a horizontal force of 16N. When the block has displaced 5m along the inclined plane. What would be the speed of the block if the plane is rough and a friction of 5N is acting on the block?
December 5, 2010

5th grade math
explain how a decimal is related to a percent.
December 2, 2010

6th grade
i got the general pattern x*5/6 but there is a second part "If a movie ticket costs 7.50, what is jame's weekly allowanse?"
December 2, 2010

6th grade
if james spends 5/6 of his weekly allowance seeing a movie he has how much of his allowance left
December 2, 2010

Geometry Please Help
3x I think i could be wrong
December 2, 2010

Fractions
My denominator is 6 more than my numerator. My simplest form is 2/5 What fraction am I?_______
December 2, 2010

math-rates
1,680 kilobytes in 4 minutes ..........how do u get it....... lesson 6-2 ......rates....6th grade pg. 289 ......#2
December 2, 2010

math-rates
.....rates....6th garde.....lesson6-2 5pounds for $2.49
December 2, 2010

business law
Case study- Lola Langston decides to make it rich by forming a general partnership with her friend Irvine and opening up go-go dancing bars with females and males dancing on a stage in “skimpy” clothing. The first bar is in the town of Bugtussle and the second in the...
November 30, 2010

Physics
What would the gauge pressure be on a diver in atmospheres if she could dive to a depth of one km in sea water? One atmosphere is 1.01 X 10^5 N/m2. The density of sea water is 1.03 X 10^3 kg/m3.
November 30, 2010

Physics
A 100.0 meter long transmission cable is suspended between two towers. If the mass density is 2.00 kg/m and the tension in the cable is , what is the speed in m/s of waves on the cable?
November 30, 2010

college
If 0.0900 g of a metal, M, reacts with excess hydrochloric acid to form 5.00*10(exp.)-3 moles of hydrogen gas and a solution of MCl(subscript)3. Calculate the molar mass of metal, M and identify it. The unbalanced equation is: M(s)+ HCl(aq) =>MCl(sub.)3 + H(sub)2.
November 30, 2010

world history
Today i got asked to write 3 fact bullets about the 7 aspects of civilization With details from the fertile crescent dose that mean 7 bullets or no?
November 29, 2010

physics
a flight attendant pulls her 75 N flight bag a distance of 325 m along a level airport floor at a constant velocity. the force she exerts is 39 N at an angle of 57 degrees above the horizontal. calculate the coefficient of kinetic friction between the flight bag and the floor.
November 28, 2010

Physics
a sled mass 50 kg is pulled along snow-covered, flat group. the static friction coefficent is 0.30, and the sliding friction coefficient is .10. what force is need to get the sled moving? then, what force is needed to keep the sled moving at a constant velocity?
November 28, 2010

Chemistry
12.5 g of KCl (MM = 74.55 g/mol) is dissolved in enough water to make 675 mL of solution. Calculate the molarity of the KCl solution.
November 28, 2010

US History
Mi dispiace, I couldn’t stay High taxes were in my way And I had insufficient funds to pay So I came to the land of America Our homeland could no longer be tilled And it was to overfilled And even though I could be killed I come to the land of America So like a bird~ of ...
November 28, 2010

US History
thank you :] I need to make it at least 3 minutes but I'm kind of stuck. I know that: They worked with textiles, mills, and Cotton gins and stuff They had to Leave school They rarely accepting charity They skimped food They got part time jobs like selling fruit They had ...
November 28, 2010

US History
I'm doing a song about Italian Immigration from the 1800's for a project nd I'm kind of stuck. Can someone help me out? What I have is this: Hey fratello, wish me luck Hey sorella, I’m awestruck Hey there Nonno, I’m earning bucks In the land of bountiful ...
November 28, 2010

chesmistry
about how many skittlesium nuclei would remain after three half lives if the intial sample had 500 skittles?
November 27, 2010

Physics
A toddler is on a playground swing. When she is all the way on the right, then ... her tangential acceleration is maximal to the right. her kinetic energy is maximal. her tangential acceleration is maximal to the left. her tangential acceleration is zero. her velocity is ...
November 26, 2010

Reimbursement Methodologies
Jessica, I am aslo doing my exam but I am really having problems with number 4 in part B exam # 40976200 was wondering if you can help. Thanks
November 26, 2010

Physics
Why does tension in a rope increase as the rotational speed of a ball increases?
November 24, 2010

US History
I'm doing a song about Italian Immigration from the 1800's for a project nd I'm kind of stuck. Can someone help me out? What I have is this: Hey fratello, wish me luck Hey sorella, I’m awestruck Hey there Nonno, I’m earning bucks In the land of bountiful ...
November 24, 2010

Mathematics
the probability of the home team's winning a basketball game is 80% describe a simulation of the probability the home team will win three homes games in a row
November 22, 2010

math
There's a circle with that has a dot in the middle with two line going to the left and right that's is 16 m. I have to find the area of the circle. I have to give that exact area and an approximate area to the nearest square unit. Help?
November 18, 2010

math
Is the exact area of a circle with an 16 m radius 32 m squared? And what would be the approximate area be?
November 18, 2010

Math
I need an algrbra expression
November 18, 2010

Science
When served at 200 km/h (124 mph), what is the equivalent weight exerted on the tennis ball?
November 17, 2010

physics
In the figure below, two point particles are fixed on an x axis separated by a distance d. Particle A has mass mA and particle B has mass 4.00mA. A third particle C, of mass 96.0mA, is to be placed on the x axis and near particles A and B. In terms of distance d, at what x ...
November 17, 2010

Physics
I do not know. I am having a hard time finding how to do this.
November 17, 2010

math
rachel is ranked 72 out of 451 students. whats her class rank percentile?
November 16, 2010

Math- Precalc
could someone please help me solve this problem... e^x - 12e^(-x) - 1
November 15, 2010

Chemistry
What is a enantiomer?
November 14, 2010

Chemistry!
Hey jiskha. Microwave ovens emit microwave radiation that is absorbed by water. The absorbed radiation is converted to heat that is transferred to other components of the food. Suppose that the microwave radiation has a wavelength of 12.7 cm. How many photons are required to ...
November 14, 2010

More chemistry
Hey jiskha. Microwave ovens emit microwave radiation that is absorbed by water. The absorbed radiation is converted to heat that is transferred to other components of the food. Suppose that the microwave radiation has a wavelength of 12.7 cm. How many photons are required to ...
November 14, 2010

AP chemistry
For the following electronic transitions in the hydrogen atom, calculate the energy, frequency, and wavelength of the associated radiation. From n = 3 to n = 6. From n = 9 to n = 3. From n = 7 to n = 4.
November 12, 2010

Physics
If it goes under standard level. Exe; sea level is 0 feet. Anything under the sea is x feet below 0.
November 12, 2010

algebra
two nombers have a sum of 15. one of the numbers is x. Find an expression for the other number
November 12, 2010

chem
AgNO3 + NaCl produces AgCl + NaNo3 how much AgCl is produced when 3.10g of AgNO3 and .600g of NaCl react?
November 9, 2010

Calculus
a police helicopter is flying at 200 km/hr at a constant altitude of 1 km above a straight road. The pilot uses radar to determine that an oncoming car is at a distance of exactly 2 km from the helicopter, and that this distance is decreasing at 250 km/hr. Find the speed of ...
November 8, 2010

Calculus
Solve & plot a graph for the following: F(X)=cos(X)-cos to second power X for the interval negative pi greater than or equal to X less than or equal to positive pi
November 7, 2010

Calc
Let F be the function defined by F(X)=12X to the 2/3 power minus 4X Find the intervals of which F is increasing? Find X & Y coordinates of all relative max. pts? Find X and Y Coordinates of all relative min pts? Find the intervals of which F is concave down? Sketch a graph of F
November 6, 2010

12th grade
Solve & plot a graph for the following: F(X)=cos(X)-cos to second power X for the interval negative pi greater than or equal to X less than or equal to positive pi
November 6, 2010

chemistry
Is the ritalin molecule a polymer?
November 5, 2010

math
The distance from B to D is approximately (x+10) feet, and the distance from A to C is approcimately (2x-5.3) feet. what is the approximate distance from A to C?
November 4, 2010

math
MNPQ is a rhombus. The measure of angle MRQ is (13t-1) degrees, and the measure of angle PQR is (7t+4) degrees. what is the measure of angle PQM?
November 4, 2010

math
The scissor lift forms rhombus PQRS with PQ= (7b-5) meters and QR= (2b-0.5) meters. IF S is the midpoint of Line RT, what is the length of line RT
November 4, 2010

math
A square graphed on the coordinate plane has a diagonal with endpoints E (2,3) and F (0,-3) what are the coordinates of the endpoints of the other diagonal?
November 4, 2010

Geometry
A square graphed on the coordinate plane has a diagonal with endpoints E (2,3) and F (0,-3) what are the coordinates of the endpoints of the other diagonal?
November 4, 2010

Geomtry
The scissor lift forms rhombus PQRS with PQ= (7b-5) meters and QR= (2b-0.5) meters. IF S is the midpoint of Line RT, what is the length of line RT
November 4, 2010

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