Wednesday
July 30, 2014

Posts by Daniel


Total # Posts: 824

math
A tree casts a shadow of 28 feet. At the same time, a biologist who is 7 feet tall casts a shadow of 2 feet. How tall is the tree?

math
A double recipe of cookies calls for 5 cups of flour. Which of the following proportions could be used to find the amount of flour for a triple recipe? 5/2= f/3 2/5=f/3 2/3 = f/5 3/2=5/f

math
Which of the following is the equation of a direct variation that has a constant of variation equal to -? y = x - -y = x y = -2x y = -x

math
Which of the following sets of ordered pairs is not a direct variation? (0, 0); (-2, 4); (3, -6) (1, 1); (-2, -2); (3, 3) (10, 2); (15, 3); (20, 4) (0, 0); (1,

physics
If the initial velocity of the car in the previous problem (the car accelerates at 5.00 km/hr/s for 3.50 sec) is 22.6 km/hr, what is the final velocity of the car?

Physics
A car experiences an average acceleration of 5.00 km/hr/s for 3.50 sec. What is the change in velocity of the car?

Physics
An ostrich runs north in a straight line for 21 meters. She then turns around and runs 25 meters back toward her nest (south) on the same path. What is her displacement?

physics
A man weighs 645 N on Earth. What is his mass?

Math
Please simplify this expression: 8b + 9 + 4b - 3b + (-2b) - (-5)

finance
Initial spot exchange rate (¥/$) 110.60 Initial price of a Nissan Xterra (¥) 2,800,000 Expected US dollar inflation rate for the coming year 2.000% Expected Japanese yen inflation rate for the coming year 0.000% Desired rate of pass through by Nissan 70.000% a. What wa...

grammar
Thank you for your previous answer. There were so many questions that I missed it. I hope that you will help me in the future.

grammar
How do you write 1234.567 in English word form?

Economics 210
Information given is sample mean of 12 for a sample of 26. Sample deviation is 3. Using a .02 level of significance. H0 u< or equal to 10 and H1 u> 10 a. Is this a one or two tailed test? b. what is the decision rule? c. what is the value of the test statistic? d.what is...

grammar
I have to write 1234.567 in English word form. How do I write this number?

taylor ranch
38-47-15-36-91-25-14-17-65

Physics
Oh wait never mind. Seems like there's some rounding issues going on with the online system. Thanks for the help drwls.

Physics
That didn't work. I think you're supposed to find work in each case but I'm not sure how to do that.

Physics
Some Carnot engine has an efficiency 0.700. The hot reservoir temperature is 900K. This means that the temperature of the cold reservoir is 270K. If the cold reservoir is dropped to 260K, the new efficiency is 0.701. If the output of the power is kept constant by increasing th...

Grammar
Where do we put the "and" when writing a number, 1234.567 for example, in words? Some references say, "one thousand two hundred and thirty-four point five six seven. Other references say, "one thousand two hundred thirty-four and five hundred fifty-six thou...

Physics
Some cooking pan whose bottom is made out of copper has a radius 0.1 m and thickness 0.003 m. The water in the pan boils at 1.7e-3 kg/s. How much higher is temperature of the outside surface of the pan's bottom compared to the inside surface?

statistics
suppose you are testing Ho:p=.65 versus Ha: p<.65 . for a random sample of 100 people, x=58, where x denotes the number in the sample that have the characteristic of interest . use a .01 level of significance to test this hypothesis.

statistics
Use the data given to test the following hupotheses. Assume the data are normally distributed in the population. Ho: M=7.48 Ha:m>7.48 xbar = 6.91, n=24, sigma=1.21,alpha=.01

statistics
a study by Hewitt Associates showed that 79% of companies offer employees flexible scheduling. suppose a researcher believes that in accounting firms this figure is lower. The researcher randomly selected 415 accounting firms and through interviews determines that 303 of these...

IT 240
2. You are the network administrator for a company that has a peer-to-peer network. How would the pieces and components of this network relate to each other? Define all of the components of this type of network.

calculuc
A rectangular box without a lid is to be made from 12 square meters cardboard. Find the maximum volume of such a box.

math
A rectangle is 3 times as long as it is wide, it's area is 108 square centimeters. What is the length? what is the width?

Physics
Find the speed at which Superman (mass=88.0 kg) must fly into a train (mass = 17998 kg) traveling at 60.0 km/hr to stop it. Running into the train at that speed would severely damage both train and passengers. Calculate the minimum time Superman must take to stop the train, if...

algebra
multiply and simplify by factoring sqrt20a^11b*sqrt8a^12b^11

algebra
multiply and simplify by factoring sqrt20a^11b*sqrt8a^12b^11

algebra 1-B
solve (sqrt14-x)+8=(sqrt3-x)=11

physics
10

MGT330
General environment – how will the forces be changing over the next three years and how will these forces impact the industry (for example, demographics – aging population)?

chemistry
26.5 moles of a .2 M aqueous solution of NaOH is required to titrate 50 ml of an aqueous solution of HNO3, what is the concentration of HNO3. I don't want the answer, I want to know how to do it.

chemistry
26.5 moles of a .2 M aqueous solution of NaOH is required to titrate 50 ml of an aqueous solution of HNO3, what is the concentration of HNO3. I don't want the answer, I want to know how to do it.

Physics
Thanks drwls. I'm having trouble with part b though. What is R? For the appropriate mass, am I suppose to use the density times the thickness to get the mass of the sail and with that, add the mass from payload?

Physics
Some spacecraft design uses a solar sail made of aluminized plastic. As sunlight reflects off the sail, radiation pressure drives the spacecraft outward away from the sun. a. If the sail material has a density of 700.0 kg/m3, what is the maximum thickness of the sail for which...

optimization calculus
Let length be L and width of open end be W. Height is then 144/(LW) Area of netting required A = LW (top) + WH (end) + 2LH (sides) A = LW + 144/L + 288/W Differentiate to find dA/dL and dA/dW and equate both to zero. Solve these as a pair of simultaneous equations. You should ...

7th grade math
You need to show a Venn Diagram for this question

7th grade math
A group of 32 students went to the amusement park.All of them either rode the Ferris wheel or Roller coaster.Seventeen rode the Ferris wheel,23 rode the roller coaster,and 8 did both.How many rode only the Ferris wheel

lccc
An urn contains 4 red and 3 blue marbles. What is the probability when three marbles are selected randomly that all 3 will be red, if we select each marble a) with replacement b) without replacement

7th grade math
Each person has taken four tests and has one more test to take.Find the score that each person must make to change the mean or median as shown Barry has scores of 93,84,86,and75.He wants to raise the mean to 86

Math
24x - 10 = 18x - 4. Please I need operations for this equation

math
integration of cot^4(1-2x)dx

math (calculus)
i dont know what would be the answer

math (calculus)
what would be the answer?

math (calculus)
what would be the answer when you plug 5pi/4 into this equation 6sec^2x-7sinx for x? i cant get the answer need some help

MATH(CALCULUS)
f(x)=12x/(sinx+cosx) find f'(-pie) need some help!

last question!!need help!!
oh ok thanks for that

last question!!need help!!
ok and yes ive tried all thoses answers i put them in to see if its right and they are not i dont know why they are not right cause it has to be cause sinpie=0 and cospie=-1 so leaves with -12pie or -12 but somehow they arent the answer i quess i have to work more into it but ...

last question!!need help!!
can you help me!!

last question!!need help!!
this is the equation: f(x)=12x/(sinx+cosx) and i need to find: f'(-pie)

last question!!need help!!
yes i need to find the derivative of f'(-pie)

last question!!need help!!
f'(-pie) thats what i need to find

last question!!need help!!
im not saying it like that and i did the work but its not right answer the computer says when i put the answer in it says incorrect. this is what i did: 12(-pi)/(0+(-1)) = 12pi but its not right i dont know why?

last question!!need help!!
thats not the answer

last question!!need help!!
f(x)=12x/sinx+cosx find f'(-pie)

calculus
f(x)=12x/sinx+cosx find f'(-pie) anyone know the answer!!! need help!

math
f(x)=12x/sinx+cosx find f'(-pie) need help!! anyone know the answer!!

need some help!!!
im confused on this problem and i really need some help if you can help me and yes that is the problem i am trying to solve i would appreciate it

need some help!!!
sorry about that and i said yes that was the way but in the computer it doesnt have the parenthesis but yeah its the same way that the problem im trying to solve

need some help!!!
f(x)= 12x ________ sinx+cosx thats how the problem is and i need to find f'(-pie)

need some help!!!
f(x)=12x/sinx+cosx find f'(-pie) anybody know the answer!!!

calculus
ok how about this one: f(x)=12x/sinx+cosx find f'(-pie) this is what i did: 12(-pi)/(0+(-1)) = 12pi is that right what am i doing wrong and what would be the answer

calculus
m=pi and b= y-pi=pi(x+5pi) y-pi=pi(x)+5pi(pi) m=pie but what does b= though

calculus
-find the equation of the tangent line to the curve y=5xcosx at the point (pi,-5pi) -the equation of this tangent line can be written in the form y=mx+b where m= and b= -what is the answer to m and b?

calculus
yeah its 12x/(sinx+cosx) but in my problem there is no ( ) but yeah its the same thing but what would the equation be to plug in (-pie)

calculus
i have unlimited trys so it dont matter but 12pi not the answer either

calculus
the computer says its not the answer incorrect it says

calculus
f(x)=12x/sinx+cosx find f(-pie)

Calculus(derivatives)
the answer was 6sec^2x-7sinx but what would it be if you put in (5pi/4) how do u put sec^2 in the caculator

Calculus(derivatives)
f(x)=7cosx+6tanx, find f'(x)and f'(5pie/4)

math
use integration by parts to prove the following reduction formula: |cos^nx dx =1/n cos^(n-1)xsinx +(n-1)/n |cos(n-2)xdx

Pre algebra
3(n+1)/7is greater than or equal to n+4/5 how would you work this

global science
Where do the cold and hot winds come from in Hawaii, Honolulu

calculus
find the area of the region R that lies under y=√x (x+1), over 0≤x≤4

chemistry
23 stands for the GFM of sodium

geometry
What is the area of a equlateral triangle with the measurement of 6-inch side?

chemistry
Water has an equilibrium vapor pressure of 23.8 mm Hg at 25 C. If 1.00 g H2O is sealed in a 20 L flask, what mass will remain in the liquid phase when equilibrium is established? ( 760 mmHg = 1 atm, R =0.0821 L.atm/mol.K)

Mathematics
1.180,000 2.150,000 3.27

Mathematics
Suppose humans walk 10,000 steps a day on average. If your average step it about 18 inches, how many inches do you walk in a day? How many feet per day? How many miles a day?

chemistry
three student chemists measured 50.0 mL of 1.00 M NaOH in separate Styrofoam "coffee cup" calorimeters ( Part B). Brett added 50.0 mL of 1.10 M HCI to his solution of NaOH; Dale added 45.5 mL of 1.10 m HCL 9 eqaul moles) to his NaOH solution. Lyndsay added 50.0 mL of...

physics
A mass of 10kg is placed on the top of a plane inclined at 45 degrees to the horizontal and allowed to slide down. What is the acceleration of the mass if the frictional force opposing is 3.2N.

British Literature
What two literary devices are used in the novel sense and sensibility?

physics
M1*V1 + 0 = (m1+m2)V 1200V1+0=(1200+1000)45 1200V1 = 2200*45 1200V1 = 99000 V1 = 99000/1200 V1 = 82.5km/h

physics
its a science word to do with forces and its scrambled itsreniat

geometry
taibg tihygta tyq

7th math
At the mall, you spent a total of $170.86. You bought 2 pairs of jeans for $ 39.95 each,a jacket for $45.99, and shirts for 14.99each. How many shirts did you buy

math
thank you

math
-3.5- 4f=10-2.5f solve the equation

math
thank you

math
-z-(z-6)=8 solve the equation

georgia history
Sherman's Atlanta campaign battles what is the date of the battle where is the location ,why is particular battle significant in the civil war,

7th grade
what does b equal

7th grade
2(2.5b-9) + 6b= -7 what is b

7th grade math
Thank you

7th grade math
9.8c + 8d - 4.6c + 2.9d simpilfy the expression

Economics for Manager
Hello, Could someone please help me find the answer to this question: The two largest diner chains in Kansas compete for weekday breakfast consumers. The two chains, Golden Inn and Village Diner, each offer weekday breakfast customer a “breakfast club” membership tha...

Math
If two indistinguishable dice are rolled, what is the probability of the event {(2, 2), (3, 2), (1, 2)}?

college
If two indistinguishable dice are rolled, what is the probability of the event {(2, 2), (3, 2), (1, 2)}?

accounting
What benefits do you see for the U.S. economy in tax-sparing credits? Should it be expanded or reduced? Why or why not? The North American Free Trade Agreement (NAFTA) has tax consequences. Discuss the costs and benefits as you see them for the U.S. from NAFTA.

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