Monday
July 28, 2014

Posts by Katrina


Total # Posts: 196

statistics
I need help to understand formula

statistics
A student of the author surveyed her friends and found that among 20 males, 4 smoke and among 30 female friends, 6 smoke. Give two reasons why these results should not be used for a hypothesis test of the claim that the proportions of male smokers and female smokers are equal....

Sociology
In the U.S., which social class has benefitted the most from the tax breaks?

Bio
A biologist measured the amount of DNA in several single diploid cells taken from a culture. He knew that these cells could divide mitotically, but not meiotically. His data is shown below: Cell Number and DNA content in micrograms: Cell 1 (11.1 micrograms) Cell 2 (5.4 microg...

culturally diverse
D - In many Native American cultures, language occurs primarily within the context of work and learning important crafts.

culturally diverse
Young children's functional use of language within a work context is often observed in... a. mainstream industrialized societies b. triadic interactions in Mexico-American group c. rural Appalachian Black communities d, Native American cultures

math
Fantasia Florist Shop purchases an order of imported roses with a list price of $2,375 less trade discounts of 15/20/20. What is the dollar amount of the trade discount? (Points : 2.5)

math
What is the force exerted by a catcher's glove on a 0.15-kg baseball moving at 35 m/s that is stopped in 0.02 s?

math
What is the force exerted by a catcher's glove on a 0.15-kg baseball moving at 35 m/s that is stopped in 0.02 s?

Physics
A man is pulling on a rope with a force of 86 N directed at an angle of 64◦ to the horizontal. What is the x-component of this force? Answer in units of N What is the y-component of this force? Answer in units of N

Physics
Sue and Jenny kick a soccer ball at exactly the same time. Sue’s foot exerts a force of 49.9 N to the north. Jenny’s foot exerts a force of 119.7 N to the east. a) What is the magnitude of the resultant force on the ball? Answer in units of N b) What is the direction...

ALGEBRA HELP
bobpursely can u help me with a question?

algebra 2
thank you so much Reiny your a life saver ;)

algebra 2 help
can you please help me with this

algebra 2
how do i work it out i dont know how to do it though

algebra 2
simplify the expression -5+i/2i

ece
A preschool child can be designated a reader when he or she: a. writes words b. sounds out a word and is almost correct c. has both phonemic and phonological awareness d. understands and/or acts appropriately when looking at a written word

Literature
ok, thx for the help

Chemistry
Do you think this answer is correct? The nucleus subatomic structure is held together by a strong force. While, it holds three quarks together to make a nucleon it also holds the nucleons together which forms the nucleus. A nucleon could be either a proton or neutron. The prot...

Science
What does this word spell in plate tectonics rorpsfgnloadeeasi

math
To find the perimeter, you just have add the length+width+length+width. In this case, the answer will be: 1 250m 80 80 45 + 45 ________ 250

physics
why and how does the blowing snow charge the fences?

math
how do I use multiplication and the Distributive property to find the quotient of 108/6

math
dave delivered 52 newspapers in all.saturday and sunday.he delivered 8 more newspapers on sunday than on saturday.how many newspapers did dave deliver on sunday.

Mathhhhhhhhh
1.Describe the effects on the graphs y = sin k0(0 is theta) and y = cos k(0 is theta) as the value of k vaires.

6th grade history
thank you.really appreciate it :D

6th grade history
how did athens become rich?

math
The equation y = 400(1.03)x is an example of

math
In a particular small town, the population in 1995 was 1200. Ever since then the population has grown by 4% every year. If conditions stay the same, what is the approximate expected population in the year 2000?

math
Rewrite using only positive exponents: x−5y3 how do you rewrite without negative exponents?

chemistry
I need help in learning to find the correct information. I tend to spend hours and I still get frustrated. Maybe some helpful websites. Thank you

chemistry
Week 5, Day 4, respond to the problem statement assigned to you for this week. At a prominent state hospital, a 45-year-old woman is receiving a ‘combined modality' treatment for the initial stage of breast cancer. State the two aspects included in this treatment. Sta...

algebra
Rewrite with positive exponents. Assume that even roots are of nonnegative quantities and that all denominators are nonzero. (2x^2y-^1)^-6

english
Corrections: Cancer is known as the unbiased killer; it does not discriminate in the race, age, or sex of it victims. Lung cancer is the number one cause of cancer deaths for United States men and women. Lung Cancer takes millions of lives each year, sometimes without the slig...

statistics
From the Arizona Department of Weights and Measures: Among 31 inspections sat a NAPA Auto Parts store, 88% failed. X= ?

physics
A six kilogram object undergoes an acceleration of 2.0 meters per second squared. Part a. What is magnitude of the net force acting on the object? Part B. If the same force is applied to a 4 kilogram object what acceleration is produced?

Calc
If a rock is thrown upward on the planet Mars with a velocity of 17 m/s, its height (in meters) after t seconds is given by H = 17t − 1.86t^2. (a) Find the velocity of the rock after one second. (b) Find the velocity of the rock when t = a. (c) When will the rock hit the...

math
(7+9)+3= 1+(9+5)=

Math
Find the cost function if the marginal cost function is dC/dx=2x-15 and fixed costs are $75.

Calculus
Find all points at which the graph of f (x) = x^3 −3x has horizontal tangent lines.

Chemistry
I need help writting a formula for: AgNO3(l) + PbNO3(l) + HgNO3(l) + HCl (l)

Chemistry
A liquid hydrocarbon (Cx Hy) is found to be 16.37% H by mass. A 1.158-g vaporized sample of the hydrocarbon has a 358 mL volume at 71.0 C and 749 mmHg. what is the molecular formula for this hydrocarbon?

Chemistry
3. A liquid hydrocarbon (Cx Hy) is found to be 16.37% H by mass. A 1.158-g vaporized sample of the hydrocarbon has a 358 mL volume at 71.0 C and 749 mmHg. what is the molecular formula for this hydrocarbon? 4. A 1.00 g Sample of C7H603 (s), us completely burned in a bomb calor...

precalculus
Find an angle between o and 2pi that is coterminal with the given angle -8pi/3: 71pi/2: 11pi/7:

precalculus
Write and simplify the difference quotient for the function b(t)= 3t^2-4t+5 over the interval [7,7+h]

Calculus (pleas help I really need to check this)
Consider a window the shape of which is a rectangle of height h surmounted a triangle having a height T that is 1.3 times the width w of the rectangle. If the cross-sectional area is A, determine the dimensions of the window which minimize the perimeter. h=______ w=______ What...

Calculus (please help I really need to check this)
Consider a window the shape of which is a rectangle of height h surmounted a triangle having a height T that is 1.3 times the width w of the rectangle. If the cross-sectional area is A, determine the dimensions of the window which minimize the perimeter. h=______ w=______ What...

science
The resulting solution is saturated because 86 is what equals both of the grams of salt added to the water at degrees C. 15 g + 50 g = 86 grams

Calculus (pleas help I really need help with this)
The cross-sectional area is jus the rectangle...

Calculus (pleas help I really need help with this)
I tried that... it's not it... apparently there must be something wrong with the arythmetic but I can't find what it is...

Calculus (pleas help I really need help with this)
Consider a window the shape of which is a rectangle of height h surmounted a triangle having a height T that is 1.3 times the width w of the rectangle. If the cross-sectional area is A, determine the dimensions of the window which minimize the perimeter. h=______ w=______ What...

Calculus (please help!!!!)
Consider a window the shape of which is a rectangle of height h surmounted a triangle having a height T that is 1.3 times the width w of the rectangle. If the cross-sectional area is A, determine the dimensions of the window which minimize the perimeter. h=______ w=______ What...

Calculus (please help!!!)
Consider a window the shape of which is a rectangle of height h surmounted a triangle having a height T that is 1.3 times the width w of the rectangle. If the cross-sectional area is A, determine the dimensions of the window which minimize the perimeter. h=______ w=______ What...

Calculus
Hi, I wasn't posting under different names, I have just used my name and I was just posting the explanation I received from other tutor, I didn't understand some of it so I posted it again because right now it must be on page 5 or something like that... I'm not ans...

Calculus
In a chemical reaction, substance A combines with substance B to form subtance Y. At the start of the reaction, the quantity of A present is a grams, and the quantity of B present is b grams. Assume a is less than b. At time t seconds after the start of the reaction, the quan...

Calculus please help!!
Consider a window the shape of which is a rectangle of height h surmounted a triangle having a height T that is 1.3 times the width w of the rectangle. If the cross-sectional area is A, determine the dimensions of the window which minimize the perimeter. h=______ w=______ What...

Calculus
In a chemical reaction, substance A combines with substance B to form subtance Y. At the start of the reaction, the quantity of A present is a grams, and the quantity of B present is b grams. Assume a is less than b. At time t seconds after the start of the reaction, the quant...

Calculus (please help!!!)
Consider a window the shape of which is a rectangle of height h surmounted a triangle having a height T that is 1.3 times the width w of the rectangle. If the cross-sectional area is A, determine the dimensions of the window which minimize the perimeter. h=______ w=______ What...

Calculus
In a chemical reaction, substance A combines with substance B to form subtance Y. At the start of the reaction, the quantity of A present is a grams, and the quantity of B present is b grams. Assume a is less than b. At time t seconds after the start of the reaction, the quant...

Calculus
HI, Thanks for the explanation, that makes a lot of sense, I don't know why it didn't occur to me that mass can't be negative... but I typed those answers and I still get them both wrong... I don't know why...

Calculus
In a chemical reaction, substance A combines with substance B to form subtance Y. At the start of the reaction, the quantity of A present is a grams, and the quantity of B present is b grams. Assume a is less than b. At time t seconds after the start of the reaction, the quant...

precalculus
For the Function, y= x(x-4)(x+8) Y-intercept is: X-intercept is:

Chemistry
Calculate the pH after 0.13 mol of NaOH is added to 1.00 L of the solution that is 0.57 M HF and 1.13 M KF. I got the answer of 3.66 to 3 sig figs, but it's wrong. Can you please tell me what I did wrong? -Thanks

precalculus
Twenty percent of a radioactive substance decays in ten years. By what percent does the substance decay each year?

precalculas
The doubling period of a baterial population is 20 minutes. At time t=100 minutes, the baterial population was 80000. What was the initial population at time t=0? Find the size of the baterial population after 4 hours.

precalculas
the amount of bacteria in a petri dish increased by a percent change of 12% each hour over a period of 15 hours. a. find the growth factor for 1 hour? b. by what total percent did the bacteria change during this 15- hour time period.? c. how long will it take for the bacteria ...

precalculas
Given the function f(x)= 4+4x^2, calculate the following values: [f(a+h)-f(a)]/h

precalculas
i tried like 7 times stil getting it wrong.

precalculas
Let f(x) be the function 8x^2-5x+2 . Then the quotient [f(5+h)-(5)]/h can be simplified to ah+b for: a= b=

precalculas
Let f(x) be the function 1/[x+12] . Then the quotient [f(4+h)-f(4)]/h can be simplified to for: -1/[ah+b] a= b=

Chemistry
I did those steps and got .869 for CH2Cl2 and .130 CH2Br2 (assuming that both is in the correct number of sigfigs), but they don't seem to be right. I just want to know what I am doing wrong, or is this also the answer you got.

Chemistry
A solution is prepared by mixing 0.0400 mol CH2Cl2 and 0.0700 mol of CH2Br2 at 25°C. Assuming the solution is ideal, calculate the composition of the vapor (in terms of mole fractions) at 25°C. At 25°C, the vapor pressures of pure CH2Cl2 and pure CH2Br2 are 133 and...

precalculas
f(x)=2-9x find f^-1(6)

Chemistry
A 13.0-g sample of ice at -13.0°C is mixed with 112.0 g of water at 80.0°C. Calculate the final temperature of the mixture assuming no heat loss to the surroundings. The heat capacities of H2O(s) and H2O(l) are 2.08 and 4.18 J/g · °C, respectively, and the e...

math
f(x)=2-9x find f^-1(6)

psychology
you are conducting research on sex differencesin emails .Your hypothesis is that the men use more declarative statements and women use more questions.what might be the advantages of using the archival method

math
Plot the points A(2,2), B(4,6),C(10,-2)Notice that these points are vertices of a right triangle (the angle is 90 degrees). Find the area of the triangle ABC:

math
Find the point (o,b) on the y-axis on the y-axis that is equidistant from the points (1,1) and (2,-1)

calculus
suppose the endpoints of one side of a rotated square are (-5,-5) and (1,-1). Find the dimensions and area of the square

personal planning
what types of diseases can you get if you are unhealthy?

humanistic theory
People often make career changes in their lives. How would the humanistic theory of behavior explain this phenomenon?

math
He becomes an electrician

poetry
What is the meaning of the phrase "steal the secret of the sun"

math
If 3 men who are yhe same in size need to drink 12 glasses of milk in a certain time, how many glasses of milk will 7 men who are the same size as them need in the same time frame they needed 12 glasses?

math
Estimate to the nearest 100 if you have: a) 56 293 b) 6 521 308

math
a) how many tens are in 1000? b) how many hundreds are in 6000? c) how many thousands are in 2 000 000?

Science
Human caused chemical changes would be I think greenhouse gases,and water pollution.

Bassick High School
this is the work on how to do it Vf = Vi+at Vf = 1.3+0.09*10 = 2.2 m/s b. jogging

Bassick High School
the speed after 10.0s is 2.2 m/s she is jogging

Algebra
Solve the system by either elimation or substitution: x+8y=18 y=-2/7x-18/7

math
1/2a-5=1/3a-1 please show me how to set this problem up and solve it

macroeconomics
Cyclical unemployment arises in part from a desire by workers to move from low-paying,low-productivity jobs to higher-paying, higher productivity jobs.

college:Macroeconomics
Which of the following is not economic investment? (a). The purchase of 100 shares of AT&T by a retired business executive. (b). The purchase of a drill press by the Ajax Manufacturing company. (c). Construction of a suburban housing project. (d). The piling up of inventories ...

college: ECON
Are you still looking for the answer.

college: ECON
The answer is true or false.

Math
A hat contains 20 names, 9 of which are females. If 8 names are randomly drawn from the hat, what is the probability that at least 6 male names are drawn??????

french
im begging you! somebody pleaaaaaase help me on this! i have about 5 hours before its due!!

french
if anyone would have the heart to look up cars of the 60's and write out a small paragraph in french about them too, i would be forever grateful!!!

french
PLEASE HELP !! i really need this translated !

french
How do u say: In the 60's, people listened to the Beatles, Francois Hardy, Gilles Vigneault, Jacques Dutronc, Bridgitte Bardot, and Buffy Sainte-marie. The beatles was a soft rock band that formed in liverpool in the 1960's. John Lennon was the lead vocalist while Paul...

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