Friday
August 1, 2014

Posts by Alex


Total # Posts: 2,548

chemistry
A 150.0-mL sample of Solution A is diluted to a total volume of 423 mL to form Solution B. If the concentration of Solution A was originally 20.0 mg/L, what is the concentration (in mg/L) of Solution B?

chemistry
Calculate the concentration (in mg/L) of a solution formed by dissolving 5.000 g of solute in enough solvent to make 2.300 L of solution.

algebra 1
From a shipment of 350 light-bulbs, a sample of 70 was selected at random and tested. If 21 light-bulbs in the sample were found to be defective, how many defective light-bulbs would be expected in the entire shipment?

Physics
When the sun was directly overhead in Syene, why was it not directly overhead in Alexandria?

Chemistry
I am not sure if I have the right answer or not to the following question. One mole of NO2 would be produced from how many moles of molecular nitrogen> According the equation N2 + 202 > 2NO2. I was thinking maybe 2. Does anyone know if I am right or wrong. Thanks

3rd grade math
How would you use a number line to round 148 to the nearest ten?

3rd grade math
1. Which number does not round to 400? 347 369 413 448

MATH HELP PLEASE
8 remainder of 1

3rd grade math
Tyrell says 753 rounds to 800. Sara says 753 rounds to 750. Who is correct? Explain.

math
Do 20+50 which is 70 then 5+9 which is 11 then add 70+11.

3rd grade math
It's 40.

3rd grade math
A Texas horned lizard laid 37 eggs in one place. To the nearest ten, about how many eggs did the lizard lay?

third grade math
Does (4+5) + 2 = 9+2? Explain

College Physics
A)2 b)5.7 C)87.7 D) 76.4 E)4.5

MATH(order of operations help)
What is the only order of operations that does NOT proceed from the left to the right

MATH(order of operations help)
What is the only order of operations that does NOT proceed from the left to the right

Math
Find a formula and graph the function: A ferris wheel is 20 meters in diameter and boarded in the six oclock position from a platform that is 4 meters above the ground. The wheel completes one full revolution every 2 minutes. At t=0 you are in the twelve oclock position.

probability---normal distribution
population size=50 population mean= 80m standard deviation = 0.70m what proportion would have average meter of 89 or more? ---------------------------- now I know how to solve this problem if the question is worded "what proportion would have average meter Greater than 89...

trig
If sin T = 1/2, then the value of sinT ( sinT - cosecT ) is

chemistry
Magnesium metal reacts with HCl solution, liberating H2 gas and generating Mg2+ cations in solution. A 2.335-g sample of Mg metal is added to 50.0 mL of a 4.00 M HCl solution, and the reaction goes to completion. How many grams of H2 are formed?

language and barriers
It's not C.. I think in order to be a good ESL teacher you yourself have to set aside all the predjudice and what not that you yourself can think off...

Algebra
In a class of 110 students, 22 received the grade of A. what fraction of the students did not receive the grade A?

Child Care Managment
which of the following is is best suited to a formative assessment of progress? A, muscular strngth and endurance B body fat analysis C. Flexibility D awareness of selfand space. I think is A. But if Im wrong can somebody help me. thanks.

calculus
using tangent half substitution show that integral of sec(x)=ln(secx+tanx)

Math
x = 125

Math
There are 150 green marbles and 100 yellow marbles in a bag that contains 250 marbles. If only yellow marbles are added to the bag so that the probability of randomly drawing a yellow marble from the bag becomes 3/5, how many yellow marbles are in the bag?

Math
What are all values of x for which |2x-3| < 7 ?

Math
Sigourney Weaver's average rate going uphill was 80% of her average rate going downhill over the same route, and it took Sigourney Weaver 10 minutes longer to go up the hill than to go down the hill. What was the total number of minutes Sigourney Weaver spent going uphill ...

Physics
An artery branches into two smaller veins, identical arteries as shown in the diagram. The largest artery has a diameter of 10 mm. The two branches have the same diameter = 5 mm. The average speed of the blood in the main artery is given in the diagram. The blood has a density...

Physics
An artery branches into two smaller veins, identical arteries as shown in the diagram. The largest artery has a diameter of 10 mm. The two branches have the same diameter = 5 mm. The average speed of the blood in the main artery is given in the diagram. The blood has a density...

Math
What is the answer for this question: Divide 100 loaves of bread among five men so that the amounts are in aritmetic progression (increase by the same amount each time) and the sum of the 3 largest is 7 times the amount of the 2 smallest

Physics
Nevermind I was able to finally figure it out xP

Physics
You set out to design a car that uses the energy stored in a flywheel consisting of a uniform 103-kg cylinder of radius R that has a maximum angular speed of 450 rev/s. The flywheel must deliver an average of 1.70 MJ of energy for each kilometer of distance. Find the smallest ...

Calculus
Sales of Version 5.0 of a computer software package start out high and decrease exponentially. At time t, in years, the sales are s(t)=20e^-t thousands of dollars per year. After 2 years, Version 6.0 of the software is released and replaces Version 5.0. Assume that all income ...

Calculus
It is estimated that the demand for a manufacturer's product is increasing exponentially at an instantaneous rate of 5% per year. If the current demand is increasing by 4000 units per year and if the price remains fixed at $850 per unit, how much revenue will the manufactu...

Physics
Ah I see thank you, I had tried a different setup before which got me the wrong answer. But this helps a bunch thanks!

Physics
A curve of radius 161 m is banked at an angle of 12°. An 840-kg car negotiates the curve at 94 km/h without skidding. Neglect the effects of air drag and rolling friction. Find the following. (a) the normal force exerted by the pavement on the tires (b) the frictional forc...

algebra
a landing airplane, moving in a straight line , passes over two points (p and q) which are 300 feet apart. when the airplane is above p, as seen from Q, its angle of elevation is 60 degress, and when above Q, as seen from p, its angle of elevation is 40 degress. at what distan...

algebra
a point on one bank he finds the angle of elevation of the top of a tree on the other bank to be 60 degress. from his initial observation point he walks back 200 feet in a straight line with the tree and his first observation point and finds the angle of elevation to the top o...

Calc
A Norman window consists of a rectangle capped by a semi-circular regional. The perimeter of some particular Norman window must be 30 meters. The radius of the semi-circular region is "x" meters. The height of the rectangle is "h" meters. Find the values pf...

Math-Please help :(
a landing airplane, moving in a straight line , passes over two points (p and q) which are 300 feet apart. when the airplane is above p, as seen from Q, its angle of elevation is 60 degress, and when above Q, as seen from p, its angle of elevation is 40 degress. at what distan...

Chemistry
How many atoms of iron will react with an excess of sulfur to form 3.098 grams of iron (II) product? Fe + S ---> FeS (2.12x10*25) I would appreciate if an explanation would be given... I need more than just the answer. Thank you!

math
equation of the line containing the points (4, 5) and (-1, 3)

Math
Somebody repeatedly roll a fair die. If it comes up 6 he instantly wins(and stop playing); if it comes up k, for any k between 1 and 5, he he waits k minutes and then roll again. what is the expected elapsed time from when he starts rolling until he wins?

Maths
Without using tables evaluate 1+tan 60'/1-tan 60'

mathmm
How to make a sign diagram

Poetry
I’m not really good at reading poems and I need help on these two poems “Linage” by Margaret Walker and “The Courage My Mother Had” by Edna St. Vincent Millay I constantly read the poems but still don’t understand what their saying I know they whe...

physics
A boy drops a stone-A, down from a cliff 480 meters high, next he throws a stone-B, 1 second later - at what initial velocity was the stone-B be thrown so as to meet the stone-A on ground at the same time? g=10 m/s2.

English
Is this poem okay? A Husband’s Kiss His kiss so soft and gentle, Sending shivers down my spine I feel the love he has for me When our lips and eyes combine His love for me is equal to mine Joining together like we are one Our two hearts are so intertwined I can’t ima...

Grade 12 University physics
A 1.2kg block is dropped from 48cm above a spring in equilibrium. The force constant for the spring is 124N/m. Calculate the maximum compression in the spring.

Maths
What is the answer for these questions:- 1) Indefinite Integrals gcx) = (8 + 39x ^ 3) / x 2) Indefinite Integrals hcu) = sin ^2 (1/8 u) 3) Evaluate x ( 8 - 5 x ^2) dx Thank you

Precalculus
Thanks! That makes sense. One step closer to passing my final exam tomorrow!

Precalculus
The letters r and è represent polar coordinates. Write the equation using rectangular coordinates (x,y). r=1+2sinè I know that I have to use something along the lines of x=rcosè and y=rsinè, but I'm stuck when I try to figure it out. Can someone...

Geometry
Given ABCD AC=28 and AE=3x-7 find the value of x

Maths
what is the answer to this question? Indefinite Integrals fct) = 14 sin (7) + 5e ^ - 15t

Chem
how do you find the boiling temp of 2m of c6h12o6

Geometry
HELP! Two Chords AB and CD, are equidistant from the center of a circle. AB=3x+7 and CD=27-x. Solve for x and find the lengths of AB and CD

child care
thank you very much!

child care
A strategy for health promotion among infants, toddlers, and young children focuses on educational programs, physical, fitness, activities and.. A. family panning B Tabacco, alcohol,anddrug use. c. Nutrition D mental health and mental disorders. Im not sure , but I think is B....

child care
which of the following taxes must be paid only by the employer? A Federal income B State C Federal unemployment D Fica Thanks

Physics
A 1.45 mol sample of an ideal gas (γ = 1.40) is carried through the Carnot cycle described in the figure below. At point A, the pressure is 28.5 atm and the temperature is 600 K. At point C, the pressure is 1.00 atm and the temperature is 400 K. How do I get the pressure ...

language
What is the main theme in Death on the Ice by Cassie Brown?

Random Question
Posted by Alex on Saturday, June 4, 2011 at 12:55pm. Based on readings from the first 20 chapters of "Invisible Man", what does the narrator mean when he refers to himself as "invisible"? Is it because of all the situations he been in and no one really seei...

Random Question
So how would you say one of the examples of the journey to solitude reflect a understanding of his own "invisibility"?

Random Question
Based on readings from the first 20 chapters of "Invisible Man", what does the narrator mean when he refers to himself as "invisible"? Is it because of all the situations he been in and no one really seeing him or his feelings? HELP PLEASE

Physics
A 5 gram bullet is fired and embeds into a 30 gram block of wood resting on a 2 m tall post. After the collision, the piece of wood lands 15 meters from the base of the post. Find the initial speed of the bullet.

Physics
A 5 gram bullet is fired and embeds into a 30 gram block of wood resting on a 2 m tall post. After the collision, the piece of wood lands 15 meters from the base of the post. Find the initial speed of the bullet.

Math
A cylindrical tank with radius 6 in. and length 12 in. is placed on its lateral face with bases perpendicular to the ground and then filled with water to a height of 9 in. When the cylinder is rotated to sit on one of its bases, the height of the water will be a+bsqrc --------...

math
There are 900 three-digit integers. The number of three-digit integers having at least one repeated digit is also a three-digit number. If that number is represented by abc where each letter is a digit, compute a-b+c (I came up with 252 integers so when I did the computation i...

chem
Which metal will react spontaneously with Cu^2+(aq) at 25 degree celcius? between Ag, Au, Mg, and hg?

chem
Which metal will react spontaneously with Cu^2+(aq) at 25 degree celcius?

Math
A container in the shape of a rectangle solid with the dimensions of 4 X 5 X10 is placed so that its height is 10. Water fills the container to a heaight of 6. The container is then turned so that the base dimensions are 4 X 10. Determine the height of the water in the container.

Statistics
Which of the following is NOT sensitive to extreme values? A) the range B) the standard deviation C) the interquartile range D) the coefficient of variation I pick B the standard deviation

geometry
If given 2 spheres, if the volume of the first sphere is 3/4 and the volume of the second sphere is 36, which is the relation of the second radius to the first?

computer sciece
I have a question, how do we find a Voltage, Current, Power if we use PSpice? I use the software to find all the Values but I don't know how to explain.

pre cal
what are the amplitude and period of the sinusoid y=6cosx+7sinx?

Chemistry
Stomach acid is 0.02M HCl. A 330mg antacid tablet is 41% magnesium hydroxide and 36.2% sodium Bicarbonate. What is the volume of acid that can be neutralized by one tablet?

Chemistry
Stomach acid is 0.02M HCl. A 330mg antacid tablet is 41% magnesium hydroxide and 36.2% sodium Bicarbonate. What is the volume of acid that can be neutralized by one tablet?

algebra 1
a landing airplane, moving in a straight line , passes over two points (p and q) which are 300 feet apart. when the airplane is above p, as seen from Q, its angle of elevation is 60 degress, and when above Q, as seen from p, its angle of elevation is 40 degress. at what distan...

Math
Find a vector with magnitude 1 that has the same direction as the following vector U= -3i+7j

Economics
Appalachian Coal Mining believes that it can increase labor productivity and, there-fore, net revenue by reducing air pollution in its mines. It estimates that the marginal cost function for reducing pollution by installing additional capital equipment is MC 40P where P repres...

Social Studies
What is the name of a Seminole home?

math
22+15= 37

chem
for my last two questions, i had Krypton as the element and 56.96 grams K3PO4. i need something to compare with

chem
A scientist wants to make a solution of potassium phosphate, K3PO4 for a lab experiment. How many grams of K3PO4 will be needed to produce 575ml of a solution that has a concentration of K+ ions of 1.4M.

chem
an empty container has a mass of 658.57g. It has a mass of 659.45g after it has been filled with nitrogen gas at a pressure of 790 torr and a temperature of 15 deg C. When the container is evacuated and refilled with a certain element at a pressure of 745 torr and a temp of 26...

chem
ethane gas, or dicarbon hexahydride, undergoes cmbustion to produce carbon dioxide gas and water vapor. A. What mass of the un named reactant is required to react with 2.2 moles of ethane? B. How amny molecules of the product with the smaller % composition of the non oxide com...

chemistry
2nd revision to the question, it is 7.62atm not 7.2atm, its now all correct on the question. sorry again Fluorine and krypton react to form binary compounds when a mixture of the two gases is heated to 500C in a nickel reaction vessel. A 100mL nickel container is filled with f...

chem
Now the numbers in the question are correct, (Fluorine = 10.10atm Krypton = 1.24atm). Please help. Fluorine and krypton react to form binary compounds when a mixture of the two gases is heated to 500C in a nickel reaction vessel. A 100mL nickel container is filled with fluorin...

chem
don't have the answer but to help those trying to help, it should be 10.10 atm for Fluorine, and 1.24 atm for Krypton.

Trigonometry
How would you find the both primary solutions to 3cos(2x) = 2.5

psychology
1.Attribution theory 2.Fundamental attribution error 3.Foot-in-the-door phenomenon

psychology
please help Create an example for each of the four terms as it applies.

math
Find the general term: 4/3, 7/7, 10/11, 13/15,...

psychology Check My answers please and help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
please help!!!!!!!!!!!

psychology
please can someone help me!!!!!!!!!!!!!!!

psychology
please check my answers...and help me if i got wrong Thanks According to social psychology, what terms are being described in the situations below? Social Facilitation Social Loafing Group Think Deindividuation 1-The newscaster reported that a vehicle carrying cash money was i...

Math(Probability)
An environmental survey contained a question asking what respondents thought was the major cause of air pollution in this country, giving the choices “automobiles,” “factories,” and “incinerators.” Two versions of the test, A and B, were used. Let...

Math(Probability)
Students took n = 35 samples of water from the east basin of Lake Macatawa and measured the amount of sodium in parts per million. For their data, they calculated notation bar x= 24.11 and s^2= 24.44. Find an approximate 90% confidence interval for μ , the mean of the amo...

physics
My question is in the link below: img828.imageshack.us/img828/7386/physicsch3581.png

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