# Posts by Michelle

Total # Posts: 1,980

A.P. Environmental Sciences
.5 grams of pure copper sulfate powder and 2L of water were used to create a copper sulfate solution with a concentration .5ppm. How was this done?

chemistry
Consider the following overall reaction which is experimentally observed to be second order in AB and zero order in C: AB+C -> A+BC Determine whether the mechanism below is valid for this reaction AB+ AB -> AB(sub 2) + A slow AB(sub2) + C -> AB+BC fast

calculus
Find the derivative of the function 1)f(t)=tan(e^2t)+e^tan2t f'(t)= [im not quite sure with this. im assuming the implicit differentiation] 2) F(t)=e^(8tsin2t) [for this one i got 2e^(8t)(4sin(2t)+cos(2t)) but it is incorrect.

calculus
well i entered it in again and now it took that first answer. i think theres a glitch with the program but thank you for showing me how you got the answers. it helps so much!

calculus
I've tried entering in 36x+1 earlier and it told me it was incorrect. I thought I did it wrong. Thanks for getting back to me.

calculus
Find an equation of the tangent line to the curve at the given point. y= (1+3x)^12 , (0,1) and find y' and y" y=cos(x^2) I got y' = -2xsin(x^2) i keep trying to get double prime but everything i try isnt working.

Physics
A circular hole in an aluminum plate is 2.725 cm in diameter at 0.000 degrees celsius. What is its diameter when the temperature of the plate is raised to 100.0 degrees celsius?

algebra
use the inequality -4t-8 is less than or equal to 12 a. t is greater than or equal to ? b. t + 4 is greater than or equal to ? c. t- ? is greater than or equal to 0 d. t + 10 is greater than or equal to ? e. 3t is greater than or equal to ? f. t/? is greater than or equal to -5

physics
The mass of the heavier block is 28 kg and the mass of the lighter blocks is 14 kg and the magnitude of the force of the connecting string on the smaller block is 24 N. Assume: g = 9.8 m/s^2 and the horizontal surface on which the objects slide is frictionless. Determine the ...

physics
Wow i definitely over thought that one. thank you so much for helping me! it means so much to me!

physics
A loaded truck can accelerate at 3.2 m/s^2 It loses its load so that it is only 0.2 as massive. By what factor must the acceleration change for the same driving force?

Math (12th)
What are the next three terms of the geometric sequence 32, -16, 8, …?

Math (12th)
7 and 12?

Math (12th)
What are the next three terms of the arithmetic sequence -18, -13, -8, -3,…?

math
One side of a rectangular garden is to be against the house. There are 80 meters of fencing material available to enclose the other three sides of the garden. Find the dimensions that will give the maximum area.

math
a chef can bake 15 pies in one hour. What is the rate in pies per minute?

Grammar
I haven't heard from you in a long time Write to me How is your family We'redoing fine in Wisconsin Spring is here and it's a lot warmer now Everyone is wearing shorts to school because it's sixty degrees I can't wait for summer You have to see my new ...

Algebra
The amount of plutonium given in a sample is determined by the function: A(t)=2.00e^-0.053 t= years How do I figure the rate of decay after four years?

math
5t-3/-2=t+3/2

math
3/2y=16/y+2

calculus
Differentiate. y = x^3/3 − x^2

science
What is the relationship between landscape and psychological well being?

calculus
Differentiate the function. S(R) = 4πR^2

calculus
Thank you so much! I didn't think to use the product rule.

Science
What concerns you have about the overall safety of the food you eat?

Science
Humans have increased their food supply by using fertilizers.

algebra
Use the information in the table. write and solve an equation that shows how many lions are in the preserve in all. then solve for the variable. Table: Age Number Cubs 18 Adolescents 14 Mature 2 Mature 7

chem
Potassium nitrate has a lattice energy of -163.8 kcal/ mol and a heat of hydration of -155.5 kcal/ mol . How much potassium nitrate has to dissolve in water to absorb 105kj of heat? Answer in kg.

chem
that's all there is unfortunately. answering just water for both gave me incorrect feedback.

chem
I know they are somewhat polar but the program im using is confusing me. for A) on the first attempt i answered just water second attempt methanol and water and the third attempt water methanol and ethanol all come back incorrect. for B) on the first attempt i tried just water...

chem
I am pretty confused on this. 1. Pick the appropriate solvent to dissolve A) Sodium Chloride (ionic) B) Sodium Nitrate (ionic) both have the choices of 1) water 2) acetone 3)ethanol 4)methanol 5)carbon tetrachloride 6)toluene 7)hexane

chem
oh okay thanks!

chem
it has been a while since ive done these so i just need a refresher. im looking for the heat of hydration of lithium chloride and sodium chloride. compound Lattice Energy deltaH soln LiCl -834 kj/mol -37.0 kj/mol NaCl -769 kj/mol +3.88 kj/mol what is delta H hydration?

chemistry
thats right now i remember! i knew it wasn't hard but its been a while. thanks! so its just -871 for LiCl

chemistry
it has been a while since ive done these so i just need a refresher. im looking for the heat of hydration of lithium chloride and sodium chloride. compound Lattice Energy deltaH soln LiCl -834 kj/mol -37.0 kj/mol NaCl -769 kj/mol +3.88 kj/mol what is delta H hydration?

algebra
x-1/4=x/3+7 3/4

math
A fire covers 420 acres and continues to spread at a rate of 60 acres per day. a.How many total acres will be covered in the next 2 days? b. Then write an expression for the total area covered by the fire in x days. c. The firefighters estimate that they can put out the fire ...

government
in a what? government people in the executive branch are also part of the legislative branch?

Precalculus
Please help...a computerized spin balance machine rotates a 25 inch diameter tire at 480 revolutions per minute. (a) find the road speed in miles per hour at which the tire is being balanced (b) at what rate should the spin balance machine be set so that the tire is being ...

math
(x+6)-(2x+7)-3x=-9

physics
An object is released from rest on a planet that has no atmosphere. The object falls freely for 5.02 m in the ﬁrst second. What is the magnitude of the acceleration due to gravity on the planet? Answer in units of m/s can someone help me please? i tried doing this -5....

Physics
In an action movie, the villain is rescued from the ocean by grabbing onto the ladder hanging from a helicopter. He is so intent on gripping the ladder that he lets go of his briefcase of counterfeit money when he is 130above the water. If the briefcase hits the water 6.0 ...

physics
can anyone at all help me please?

physics
A) A ball is thrown vertically upward with a speed of 27.6 m/s from a height of 1.9 m. How long does it take to reach its highest point? The acceleration of gravity is 9.81 m/s2. Answer in units of s B) How long does the ball take to hit the ground after it reaches its highest...

physical science
cart rolling a a speed of 10m/s comes to a stop n 2 s. what is the car's acceleration?

math
Equation

math
A wildfire spread for 7 days and covered a total 780 square miles. How can you estimate the number of square miles the wildfire covered per day?

math
Ariel has 19 more cds than her sister. Victor has 3 times as many cds as Ariel has. Which expression can be used to show how many cds the three have in total? a)19+3x b)51+3x c)76+3x d) 76+5x

world history
benjamin franklin thought the colonist would oppose new taxes from britain

Humanities
Compare and contrast the legacies of cultural syncretism in Africa and the Americas with the resistance to cultural change Westerners encountered in China and India. What cultural factors caused the differences in outcomes?

spanish
What form of conjugated verb do I use for "tus amigos" is it in the ellos category? so it would be something like Tus amigos estudian para el examen. is that correct?

History
How did the British Colonial System in Virginia differ from the Spanish system in Central America and the Caribbean? Explain the differences in the reasons for colonization and the differences in the way their colonies were set up (address both economic and social).

Economics
3. Suppose a firm has a constant marginal cost of \$10. The current price of the product is \$25, and at that price, it is estimated that the price elasticity of demand is -3.0. a. Is the charging the optimal price for the product? Demonstrate how you know. b. Should the price ...

Economics
1. Given each of the following price elasticities, determine whether marginal revenue is positive, negative, or zero. a. -5 b. -1 c. -0.5

Accounting
On July 1, 2011, ABC Grocers, Inc. purchased an investment in the 5 yr 10@ (stated rate) debt securities with a face value of \$400,000 of Brighton Corporation, a publicly traded company. At the time of purchase the market interest rate for similar risk debt was 8%. Interest is...

statistics
A machine used in a production process is set up correctly 97% of the time. Given that the machine is set up correctly, only 5% of its items it produces are defective, while 95% are not defective. On the other hand, if the machine is set up incorrectly, 60% of the items it ...

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. ...

Math
In a state with a 7% sales tax, how much tax must be paid on a shirt that sells for \$16?

Mastersin Education
Select a strategy for building relationships that can be used within an educational or work setting.

Crucible Help!!
how did rumors ruin the community in the play?

psychology
what is all the components of scientific method in psychology? i got hypothesis, dependent ans independent, and the question is does television increase aggression? how to put it in the dependent and independent variable?? and how to set everything up? I need help. thank you, ...

history
What was the role of the Empire in World War I?

science
A radical skeptic might be willing to doubt which of the following

Hi, a particle is moving in simple harmonic motion such that a = -4x. ( x in metres, t in seconds) Find the maximum speed at which the particle is travelling. Velocity = 6cos2t. My teacher said to put t = 0 and sub it into velocity equation above, but I don't know why? ...

A vessel is being filled at a variable and the volume of liquid in the vessel at any time t is given by V = A( 1- e^-kt) V a) Show that dV/dt = k(A-V) b) if one quarter of the vessel is filled in 5 minutes, what fraction is filled in the next 5 minutes? c) show that lim (x->...

human biology
A 56 year old obese male is rushed to the ER via ambulance. The EMS team reports he was found non- responsive and in shock. Additionally, they note he has a stiff rigid abdomen and can feel a large lump near the midline. Upon questioning, his wife explained that her husband ...

maths
Find the speed and direction of a particle which, when projected from a point 15 m above the horizontal ground, just clears the top of a wall 26.25 m high and 30 m away. Thanks!!!!

maths
the volume of water in a tidal pool is given by the formula V = 2cos (3pi/x ) where x is the depth of water in the pool. Find the water at which the depth of the pool will be increasing when the volume in the pool is increasing at the rate of 12 cubic metres per hour and the ...

maths
a 4m ladder is leaning against a wall when its base starts to slide away. By the time the base is 2m from the wall, the base is moving at the rate of 1m/sec. find a) the speed at which the top of the ladder is sliding down the wall b) the rate at which the area of the triangle...

SOCIAL STUDIES
I don't understand this question exactly...please help :) what are examples of how the language of Iran may reinforce gender behavior and/or stereotyping.

american government
is the public vulnerable to exploitation by powerful groups owing to their monoploy over information and why is the public vulnerable

account (urgent!!pls help)
* the year now is 31 dec 2011

account (urgent!!pls help)
accounting question [prepare journal entries for the year end adjustment] A fire broke out in the office during the year. the insurance company agreed to pay compensation of \$3000 to the company in December 2009.No entries for this compensation were made at the year end.This ...

statistics
mean cholesterol is 175mg/dl..standard deviation =20mg/dl assume approx normal distribution ..is varied. what percentage has a cholesterol level above 155mg/dl?

Marketing
A survey of local businesses firms to determine how they forecast sales will produce a variety of answers. Some will claim they do not use any format techniques to forecast sales. You know they must be using some approach, no matter how loosely defined. How do you know a ...

math for the office professional
\$248,240

My Answers Are The Exact Same.. & C Isnt Mixed Up..

career research in decision making
A resume is

Career research,decision making
Aiptitude test: (a)predict ability to learn a skill or to accomplish something writh further education or training(b) genral mental ability(c)growth of cognitive skill(d) non of the above

algebra
P=2L+2W. Find the perimeter of a rectangle whose length measures 12 centimeters and whose width measures 5 centimeters.

Medical Office Procedures
Which screen do you use to set the reason for the visit?

soc120
A moral rule is regraded as justified by the deontologist if

U.S. GOVERNMENT
what single word means the same thing as a representative democracy

Algebra 1
just wondering how to get that....

Algebra 1
there are no choices.. the answer is (17/45)

Algebra 1
find the number one-third of the way from 1/6 to 4/5

economics
In a perfect competition there is little or no incentive to do research and development (R&D). This is because in a perfect competition the firms are merely price takers and not price setters. No matter how much R&D they do, they can still not set the price. So they end up ...

medical billing in coding
the first step in coding is to read the record for the purpose of

Sociology
From the 1970s to the present, a shift in the evolution of public policy moved toward a New Federalism. How did this effect public policy? Was this positive or negative? Why?

Marine Biology
Surface currents are created by wind and the Earth's rotation. What creates deep water currents?

Shelley Katz deposited \$30,000 in a savings account at 5% interest compounded semiannually. At the beginning of year 4, Shelley deposits an additional \$80,000 at 5% interest compounded semiannually. At the end of 6 years, what is the balance in Shelley's account

MTE520
How does cultural diversity create challenges? How does cultural diversity create opportunities? How can you account for cultural diversity in your classroom management plan?

MTE520 Maintaining an Effective Learning Climate
Second Grade Classroom Scenario As Miss Gibson’s second graders break out into their learning centers, a scuffle starts in the writing center. Two boys are shoving and pushing each other. Miss Gibson stops the class and yells, “Boys stop!” Instead of stopping, ...

math
A recipe calls for 3 3/4 cups of flour. How much flour is needed to make 1/2 the recipe?

math
ming estimatesestimate An approximate calculation of a value. the angleangle The union of two rays with a common endpoint, called the vertex. of elevation to the top of a tree growing vertically 100 feet away on level ground to degres. approximately how many feet tall is the ...

Calculus
How do I differentiate ln (2X^2 - 12X + Y^2 -10Y) and the second differentiate it? HELP ASAP is much appreciated

Math
Translate the phrase to an inequality. Let X be the variable. A salary that is at most \$45,000

STAT
Electricalc has determined that the assembly time for a particular electrical component is normally distributed with a mean of 20 minutes and a variance of 9 minutes. a. What is the probability that an employee in the assembly division takes longer than 22 minutes to assemble ...

STAT
The inside diameter of a manufactured cylinder is believed to follow a normal distribution centered at 5.00 inches with standard deviation of .03 inches. The diameter of the cylinder must be within 4.95 inches (the lower specification limit) and 5.07 inches (the upper ...

STAT
Airline overbooking is a common practice. Many people make reservations on several flights due to uncertain plans and then cancel at the last minute or simply fail to show up. Eagle Air is small commuter airline. Their planes hold only 25 people. Past records indicate that 20...