Wednesday
July 23, 2014

Posts by Michelle


Total # Posts: 1,602

statistics
A history class has 75 members. If there is a 12% absentee rate per class meeting, find the mean, variance, and atandard deviation of the number of students who will be absent from each class

Chem
does charles law depend on the identity of the gas

Chem
does charles law depend on the identity of the gas

Chem
does charle's law depend on the identity of the gas

Chemistry
How many grams of NaCl would be required to make a 24% NaCl solution if 250 ml of water were used

Probability
Five cards are drawn from an ordinary deck without replacement. Find the probability of getting a. All red cards b. All diamonds c. All aces

Chemistry
Three solutions are mixed together to form a single solution. One contains 0.2 mol Pb(CH3COO)2, the second contains 0.1 mol Na2S, and the third contains 0.1 mol CaCl2. Write the net ionic equations for the precipitation reaction or reactions that occur.

Statistics
Cholesterol levels of adult males are approximately normally distributed with a mean of mg/dL and a listed variance of . Some researchers claim that the variance of cholesterol levels of adult males is less than . Suppose that we want to carry out a hypothesis test to see if t...

Pre-Calculus
How do I solve, in radians and degrees, 2-3sin(3(x-pi))=6?

Physics
user-generated content: report abuse What approximate change in decibels does an observer experience from a sound source if the observer moves to a new location that is 67% as far from the source? My answer choices are 23, -23, 40, 2.76, -2.76, 1.94, -1.94, 2.57, -2.57, and 0 ...

Chem Webwork UCI
Complete the table below: What is the pH of the solution created by combining 0.70 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? mL NaOH: 0.70 pH w/ HCl: 1.08 pH wHC2H3O2: 3.23 Complete the table below: What are the pH va...

Chem Webwork
nevermind, i got the answer

Chem Webwork
Complete the table below: What are the pH values if you take into account that the 8.00 mL of 0.10 M Acid was first diluted with 100 mL of water (like it will be in the experiment you perform in lab)? mL NaOH: 0.70 pH w/ HCl: 2.14 pH w/ HC2H3O2: ??? I got pH w/ HCl, but I can&...

political science
Which President developed the Policy of preemption with regard to foreign policy?

Math(can you just check my answer please)
¡çLMN and ¡çNMO are adjacent angles that share MN ƒåƒåƒåƒåƒâ as a side. Together, those two angles form ¡çLMO. What equation can you write that shows the relationship between m¡...

science
What is another word for exothermic?

math
a triangle with a side of length 2/7 units and side of length 15/28 units

Trigonometry
Proof the identity 1 + sin 2x/cos 2x = cos x + sin x/ cos x - sin x

Trigonometry
If 13 sin x + 5= 0 and x є (0º; 270º) calculate the sum of 2x

Trigonometry
cos(54º-X)=sin2X

Math
If you pay 3.5 % interest over 4 years and the interest earned is $498.40 what is the principal

trig
If an equilateral triangle has a side of 10 ft what is its altitude to two significant digits

Cal II
Intergral (27-9x^2)^(1/2) fit to theorem (a^2-u^2)^(1/2)

elapsed time
elapsed time is 2hr 37min, end time is 10:52P.M., what is the start time?

elapsed time
start 11:38a.m. elapsed time 3hr 10 min what is the end time?

Math
Using only whole numbers, how can you draw three rectangles with a perimeter of 12 units?

7th Grade Math
The area shaded is the matting and it is 64 square inches. What side length of a picture frame do you need to cover the entire picture? There is a 6inch square opening in the matting.

Chemistry
I need help on this, I don't know the answers

teaching
hello. i need help starting a pre-iep outline. i have never seen one before. thank you.

Science
Do neurons send electrical messages to the brain to tell the body what to do?

social studies
what facts are there on point of view on tariffs on imported goods

English-
What is the theme of the book NUmber 8 by Anna Fienberg?

English- Figurative Language
What type of figurative language is the following sentence? : Oh, never, if I live to a million, Shall I feel such a terrible pain.

Math
a. X is the number of tables and y is the number of chairs: 90x+40y< or = $1000 b. i have no idea c. 3

Chemistry
2g NaHCO3 + .6 mL HCL --> NaCl+CO2+H2O How much carbon dioxide do I get? How do I find out? I got 410 mL of CO2, is this correct?

Chemistry
2g NaHCO3 + .6 mL HCL --> NaCl+CO2+H2O How much carbon dioxide do I get? How do I find out?

math
3/4 = $0.75 1/10=$0.10

chemistry
The combustion of propane (C3H8)produces CO2 and H20: C3H8(g)+5O2(g) 3CO2(g)+4H2O(g) Calculate the mass, in grams, of H2O that will be produced if 2.5 mol of O2 is consumed.

chemistry
The combustion of propane (C3H8)produces CO2 and H20: C3H8(g)+5O2(g) 3CO2(g)+4H2O(g) Calculate the mass, in grams, of H2O that will be produced if 2.5 mol of O2 is consumed.

PHYSICS
I used the formula, but I still don't know how to solve the problem ? Did you get it ?

Chemistry II
How much energy would be required to heat 60 grams of water from -50 degrees C to 200 degrees C?

Chemistry II
100 grams of KNO3 is dissolved in one liter of water. Calculate the freezing point depression and boiling point elevation.

english
C- unlike oak roots, maple roots often invade water lines.

double integral
1. Sketch the region of integration & reverse the order of integration. Double integral y dydz... 1st (top=1, bottom =0)... 2nd(inner) integral (top=cos(piex), bottom=(x-2)... 2. Evaluate the integral by reversing the order of integration. double integral sqrt(2+x^3) dxdy... 1...

accounting
Lone Star Theatre Inc. owns and operates movie theaters throughout Arizona and Texas. Lone Star Theatre has declared the following annual dividends over a six-year period: 2005, $7,500; 2006, $9,000; 2007, $30,000; 2008, $30,000; 2009, $40,000; and 2010, $48,500. During the en...

Chemistry
How many moles of ethanol is contained in 250.0 ml of a 1.90M ethanol solution? A. none of these B. 7.60 C. 475 D. 0.475

chemistry
how do I prepare 50% and 70% ethanol from 95% ethanol?

Psychology
s2 pooled= 19/48 (10) + 29/48 (25)

calculus
find equation of the tangent line to the graph of f(x) at the given point f(x)=(x-1)(2x+3)/(x-5) at 9, 42

Chemistry- please help
How do I go about preparing 50% ethanol and 70% ethanol from 95% ethanol?

chemisrty
calculate the percent by mass of carbon(c) in the amino acid arginine,C6H16N4.

Chemstry
Lovastatin (C24H36O5) has a molar mass of 404.53 g/m. The normal dose of the drug lovastain is 20mg. How many molecules of lovastatin (C24H36O5) are in a normal dose?

Psychology
inherited universal ideas, wishes, and memories.

Psychology
inherited universal ideas, wishes, and memories.

ON LINE LIBRARY SOURCES
HOW CAN THE ONLINE LIBRARY HELP ME WITH FINDING MY ACEDEMIC WRITING?

algebra
-4/3x+3=

physics
What is the maximum power consumption of a 8.7 V portable CD player that draws a maximum of 354 mA of current?

physics
What is the resistance of a 2.5 m length of copper wire 1.3 mm in diameter?

Language Arts
Hello! I have to write a summary of a book that I've read, and I've been writing it, and I'm worried I'm putting in too much detail/making it too specific/too long? I wasn't sure if I'm supposed to summarize the whole plot in a couple of paragraphs, or ...

Math
List the x-intercepts for the function f(x)=ln |x-1|

Math
List the x-intercepts for the function f(x)=ln |x-1|

Math
List the x-intercepts for the function f(x)=ln |x-1|

Chemistry
A fish tank holds 40 gallons of water (density 1.00g/mL) when full. What is the mass of the water in kilograms (kg)?

Math
ok thanks!

Math
Ineed to come up with an EXCEL formula for the following; Ineed to determine the total number of games. I know the % (games) of lost and I know the number of (game) wins. I need to determine the total number of games. I can figure the % of wins by subtracting the % lost from 1...

Algebra 2
what happens when the major and minor axies are exactly the same length?

math(HELP)
what is the answer to 1x2x3x4x5x6x7x8x9x10x11x12x13x14x15x16x17x18x19x20 please

Math-Algebra II
How would you interpret the findings of a correlation study that reported a linear correlation coefficient of − 1.34? The only thing I know is that it represents a negative correlation. Please shed any light you can.

Chemistry
Determine the volume of concentrated HCL and the volume of water needed to produce 20mL of 6M HCL.

US History
Hello! I have to do a project about a colony that became a state, and I decided to do Connecticut. There's some things I need to find out, like who were the first settlers, what special problems did they face, and who were the early leaders? Can someone point me out a plac...

Calculus
What is the slope-intercept equation of the line tangent to the graph of y=8ln(x) when x=5.

science
What is an hypothesis for this question; Do males and females play the same types of games?

Economics
Suppose the demand curve for a monopolist is Qd = 500 – P, and the marginal revenue function is MR = 500 -2Q. The monopolist has a constant marginal and average total cost of $50 per unit. A. Find the monopolist’s profit- maximizing output and price. B. Calculate the...

Economics
Suppose the demand curve for a monopolist is Qd = 500 – P, and the marginal revenue function is MR = 500 -2Q. The monopolist has a constant marginal and average total cost of $50 per unit.

algebraII
solve for x: 1)log(x-3)+log(x+4)-logx=log5

Math
4. Vanna has just financed the purchase of a home for $200 000. She agreed to repay the loan by making equal monthly blended payments of $3000 each at 9%/a, compounded monthly. c. How long will it take to repay the loan? d. How much will be the final payment? e. Determine how ...

MATHHH
Mike wants to buy a snowmobile. His parents decide to lend him $9 000 at 10%/a, compounded monthly, if he agrees to repay the amount by making equal monthly (at the end of the month) payments for five years. d. Write the series that represents the present value of the annuity....

math
a circular pond has a diameter of 1.8m and a depth of 55cm. if we fill the pond with water, what is its volume

math
-4(x^-8)=84

physics
Identical +1.45 µC charges are fixed to adjacent corners of a square. What charge (magnitude and algebraic sign) should be fixed to one of the empty corners, so that the total electric potential at the remaining empty corner is 0 V?

earth science
three reason and explanations why oil and natural gas is called fossil fuels?

earth science
three reason and explanations why oil and natural gas is called fossil fuels?

earth science
what's a good topic sentence and conclusion for why do they call oil and natural gas fossil fuels?

earth science
thanks:)

earth science
why do they call oil and natural gas "fossil" fuels?

earth science
how did the extinction of dinasaurs allow for the evolution of more complex creatures, such as human beings?

earth science
how did the extinction of the dinasaurs allow for the evolution of more complex creatures, such as human beings?

physics
An electron accelerates from rest through a potential difference of 184 V. What is its final speed? An electron that has a horizontal initial speed of 4.50 106 m/s enters a region that has an electric field of 120 V/m pointing vertically upward. How long does the electron take...

physics
The work done by an electric force in moving a charge from point A to point B is 2.76 10-3 J. The electric potential difference between the two points is VA − VB = 47.5 V. What is the charge

physics
Point A is at a potential of +250 V, and point B is at a potential of -150 V. An á-particle is a helium nucleus that contains two protons and two neutrons; the neutrons are electrically neutral. An á-particle starts from rest at A and accelerates toward B. When t...

Math
in 1992, the life expectancy of males in a certain country was 69.8 years. in 1999, it was 72.4 years. Let E represent the life expectency in year t and let t represent the number of years since 1992. The linear function E(t) that fits the data is E(t) =_ t+_ Use the function ...

Algebra
What is the slope of the line given by 4x = 0 by 5y = 0? How do I solve this?

physics
The magnitude of each of the charges in the figure below is 8.75 10-12 C. The lengths of the sides of the rectangles are 2.94 cm and 4.80 cm. Find the magnitude of the electric field at the center of the rectangle in the figures below. both pictures are rectangles. I dont know...

physics
An electric field of 264,000 N/C points due west at a certain spot. What are the magnitude and direction of the force that acts on a charge of -6.75 µC at this spot? magnitude?

physics
((3.54 10-9 kg)(9.8))/ 8000 N/C and it gave me the wrong answer so im not sure what im doing wrong.

physics
A small drop of water is suspended motionless in air by a uniform electric field that is directed upward and has a magnitude of 8000 N/C. The mass of the water drop is 3.54 10-9 kg How many excess electrons or protons reside on the drop?

physics
Two charges are placed on the x axis. One of the charges (q1 = +9.4 µC) is at x1 = +3.1 cm and the other (q2 = -22 µC) is at x2 = +9.3 cm. Find the net electric field (magnitude and direction) at x = +6.5 cm. (Use the sign of your answer to indicate the direction a...

physics
im getting the 26-k(q*q2)/(.37)^2=24 so 24-26 gets -2.0. -k(q*q2)/(.27)2=-2.0. and then i solve for q2 but im not geting the right answer.

physics
Two point charges are fixed on the y axis: a negative point charge q1 = -22 µC at y1 = +0.24 m and a positive point charge q2 at y2 = +0.37 m. A third point charge q = +7.7 µC is fixed at the origin. The net electrostatic force exerted on the charge q by the other ...

physics
Two point charges are fixed on the y axis: a negative point charge q1 = -22 µC at y1 = +0.24 m and a positive point charge q2 at y2 = +0.37 m. A third point charge q = +7.7 µC is fixed at the origin. The net electrostatic force exerted on the charge q by the other ...

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