Friday

January 30, 2015

January 30, 2015

Total # Posts: 76,913

**math**

the sum of the ages of sam and tomas is 27 years. seven years ago, tomas was three years more than one-fourth as old as sam. find their present age
*December 9, 2014*

**math**

idk
*December 9, 2014*

**Calculus**

Y=2sinx-cos^2(x) F"(x)=-sinx+cos^2-sin^2(x) Find the points of inflection and concavities
*December 9, 2014*

**physics**

A 17.9 kg block is dragged over a rough, horizontal surface by a constant force of 119 N acting at an angle of 30◦ above the horizontal. The block is displaced 40.7 m, and the coefficient of kinetic friction is 0.111. what is the final speed
*December 9, 2014*

**Calculus**

I don't understand where you got t=sqroot(2)-1 and what would the actual x-intercepts be? I'm really confused.
*December 9, 2014*

**Calculus**

Y=2sinx-cos^2(x) on [0, 2pi] How do you solve for the x-intercept
*December 9, 2014*

**General Calculus Question**

Ok I understand it now. Thank you.
*December 8, 2014*

**General Calculus Question**

Yeah like limit as x approaches infinity( 3x^2+2x)/(sqrt(x^2-2x) Would it equal 3 then?
*December 8, 2014*

**General Calculus Question**

I understand that problem. I get confused with the square root in the denominator. Aren't you supposed to do something with absolute values?
*December 8, 2014*

**General Calculus Question**

How do you solve a limit when it approaches infinity and there is a square root in the denominator? say the highest power is x^2 in both the numerator and denominator.
*December 8, 2014*

**APCalculus**

Thank you so much.
*December 8, 2014*

**chemistry**

2C2H6(g)+7O2(g)--> 4Co2 (g)+6H2O(l) A) if 3.00 moles of C2H6 and 9.00 moles of O2 are introducedinto an empty container at 32.0 degree C and then ignited tointiate the above reaction calculate the mass of water that isproduced. B) if the container volume is 675 what mass of...
*December 8, 2014*

**chemistry**

2C2H6(g)+7O2(g)--> 4Co2 (g)+6H2O(l) A) if 3.00 moles of C2H6 and 9.00 moles of O2 are introducedinto an empty container at 32.0 degree C and then ignited tointiate the above reaction calculate the mass of water that isproduced. B) if the container volume is 675 what mass of...
*December 8, 2014*

**Math**

Simplify (x-(1/x))/(1-(1/x)) I don't get how to do this, can someone please help me? :)
*December 8, 2014*

**Chemistry**

I am soo lost on this one, I don't even know where to begin! I have read the chapter and it's just not clicking! If you start your reaction with 0.083 g of salicylic acid, what theoretical yield of acetylsalicylic acid would you predict? If your experimental yield of ...
*December 8, 2014*

**art help**

A is the answer
*December 8, 2014*

**Physics**

A 2.3 × 103 kg car accelerates from rest under the action of two forces. One is a forward force of 1141 N provided by traction between the wheels and the road. The other is a 947 N resistive force due to various frictional forces. How far must the car travel for its ...
*December 8, 2014*

**math**

there are 13 more girls than boys on the playground. there are 22 boys. how many girls are on the playground
*December 8, 2014*

**Chemistry**

The LD50 for oxalic acid in rats is 375 milligrams oxalic acid/kilogram of body weight. Assume that the LD50 for oxalic acid in humans is the same and calculate the oxalic acid LD50 dose for a 160lb human? My calculations: 375mg/kg•1kg/2.20lb • 160lb/1 = 27,272.73 mg
*December 8, 2014*

**physics**

a movie last 2 hours. during that time what is the angular displacement of each of the following? a.the hour hand b.the minute hand c.the second hand
*December 8, 2014*

**Chemistry**

To determine the amount of oxalic acid in rhubarb, you chop up and extract 85.2 grams of homogenized rhubarb with hot water. The extract is treated with calcium hydroxide and you isolate 0.6914 grams of solid CaC2O4•H2O. How many grams of oxalic acid were present in the ...
*December 8, 2014*

**Science**

What is a species that competes with polar bears for resources?
*December 8, 2014*

**Chemistry**

2HgO--->O2+2Hg 85g(HgO)*1mol/(200.59+16)g* 2molHg/2molHgO*200.59gHg/1molHg=78.721g that is your theoretical yield so 64.0g/78.721*100=81.3%yeild
*December 8, 2014*

**Chemistry**

When HgO is heated, it decomposes into elemental mercury and molecular oxygen gas. If 64.0 g of Hg is obtained from 85.0 g of the oxide, what is the percent yield of the reaction? The balanced equation is 2HgO > 2Hg + 02.
*December 8, 2014*

**science**

a pipe that carries 10 gpm of liquid at 50 psi with at least 0.5 sq in area must fit through a hole thats 1.25 in in diameter.
*December 8, 2014*

**Math**

set the y value equal to zero and then solve for x
*December 8, 2014*

**Math Help**

there are 7 forks to 5 spoons
*December 8, 2014*

**Math**

What is the work for x-intercept? I can't figure it out.
*December 8, 2014*

**Math**

when x=0 y=-1 when y=0 x=0
*December 8, 2014*

**Math**

Find x and y intercepts of y=sinx-cos^2x on [0, 2pi]
*December 8, 2014*

**5th grade math**

yes you do its very simple good job
*December 8, 2014*

**Math (Answer ASAP)**

-30
*December 8, 2014*

**math**

Let S be the part of the sphere x^2 + y^2 + z^2 = 25 that lies above the plane z = 4. Let S have constant density k. (a) Find the center of mass. (b) Find the moment of inertia about the z-axis. so far I have found that the magnitude of r(theta)x r(thi)= 25sin(thi)but I cant ...
*December 8, 2014*

**math**

Let S be the part of the sphere x^2 + y^2 + z^2 = 25 that lies above the plane z = 4. Let S have constant density k. (a) Find the center of mass. (b) Find the moment of inertia about the z-axis.
*December 8, 2014*

**Math**

y=2sin(x)-cos(x) so when x=0 y=2sin(0)-cos(0) y=0-1 y=-1 and when y=0 0=2sin(x)-cos(x) cos(x)=2sin(x) cos(x)/sin(x)=2 cot(x)=2 x=cot^-1(2) x=26.5651 which is not between 0 and 2 pi
*December 8, 2014*

**Math**

Y=2sinx-cosx on [0, 2pi] Find x- and y-intercepts
*December 8, 2014*

**english**

How dies George figure that he, Lennie and Candy could perhaps buy the dream place?(four points).
*December 8, 2014*

**Health 4th grade**

It is important to choose simple carbohydrates for breakfast to get you started for your day. True or False My answer: True
*December 8, 2014*

**english**

yes we read it on class together
*December 8, 2014*

**english**

How dies George figure that he, Lennie and Candy could perhaps buy the dream place?(four points)
*December 8, 2014*

**Fitness and nutrition**

A person can achieve optimum daily nutrition by
*December 8, 2014*

**Biology**

Thanks! Now I have some ideas.
*December 8, 2014*

**Biology**

What can I write for an assignment that asks me to write about what ecology means to me? I don't know exactly what is meant by "means to you," as in the assignment.
*December 8, 2014*

**biology**

What are some benefits and challenges of being a pharmacologist?
*December 8, 2014*

**bio**

Enzymes are
*December 8, 2014*

**language arts**

which word best describes Mrs. Lapham in Johnny Tremain? A. generous B. kind C. parctical D. religious Is it C?
*December 8, 2014*

**Chem**

5.04x1034 atoms of Zn
*December 8, 2014*

**English**

Is this a good introduction for a Domestic violence persuasive essay? She had so much potential. Her whole life ahead of her. She wanted to get a degree, get married and have children. But she is dead...
*December 8, 2014*

**English**

Never Mind i got it! I just needed help with this question but i got it! Thanks.
*December 8, 2014*

**English**

Ya I did but I do not understand the story!
*December 8, 2014*

**English **

In the excerpt from Barrio Boy, why does Miss Hopley have another boy come to her meeting with Ernesto and his mother? Ernesto has gotten into a fight with the other boy. The other boy is Ernesto's older brother. Ernesto and his mother do not speak English. The other boy ...
*December 8, 2014*

**trig**

Solve R=3(1-sin theta) and graph
*December 8, 2014*

**Physics**

A box of books weighing 337 N is shoved across the floor by a force of 467 N exerted downward at an angle of 35° below the horizontal. (a) If μk between the box and the floor is 0.56, how long does it take to move the box 4.00 m starting from rest? 2.518 s (b) What is...
*December 8, 2014*

**Math**

Y=4 sorry
*December 8, 2014*

**Math**

y=4-2x^2+1/6x^4 How to find x and y-intercepts. I think y=0 but I don't know how to solve for the x-intercept.
*December 8, 2014*

**English**

Read The Wages of Sin and match literary analysis
*December 8, 2014*

**Physics **

A hockey puck is hit on a frozen lake and starts moving with a speed of 13.80 m/s. Exactly 5.1 s later, its speed is 7.80 m/s. (a) What is the puck's average acceleration? m/s2 (b) What is the coefficient of kinetic friction between the puck and the ice?
*December 8, 2014*

**Physics**

A 2.84 kg block starts from rest at the top of a 30° incline and accelerates uniformly down the incline, moving 1.92 m in 1.90 s. (a) Find the magnitude of the acceleration of the block. m/s2 (b) Find the coefficient of kinetic friction between the block and the incline. (...
*December 8, 2014*

**Physics**

A box of books weighing 337 N is shoved across the floor by a force of 467 N exerted downward at an angle of 35° below the horizontal. (a) If μk between the box and the floor is 0.56, how long does it take to move the box 4.00 m starting from rest? s (b) What is the ...
*December 8, 2014*

**Physics**

A 2.0 kg mass starts from rest and slides down an inclined plane 7.9 ✕ 10-1 m long in 0.64 s. What net force is acting on the mass along the incline? N
*December 8, 2014*

**physics**

Two forces are applied to a car in an effort to accelerate it, as shown below. The first force, F1 = 400 N, is applied at an angle α = 32° to the forward dashed line. The second force, F2 = 536 N, is applied at an angle β = 10° to the forward dashed line. (a...
*December 8, 2014*

**Physics**

In one of your rigorous workout sessions, you lost 140 g of water through evaporation. Assume that the amount of work done by your body was 3.8 105 J and that the heat required to evaporate the water came from your body. (a) Find the loss in internal energy of your body (due ...
*December 8, 2014*

**Physics**

Suppose 0.015 kg of steam (at 100.00 °C) is added to 0.20 kg of water (initially at 14.0°C). The water is inside an aluminum cup of mass 40 g. The cup is inside a perfectly insulated calorimetry container that prevents heat exchange with the outside environment. Find ...
*December 8, 2014*

**O Chem**

Write out the mechanism for the hydration of C6H12
*December 8, 2014*

**Organic Chemistry **

Write out two step-by-step mechanisms for the addition of HI to C7H12. Make sure to include all necessary curved arrows to depict electron pair movement.
*December 8, 2014*

**Trig (math)**

1.) Find all solutions of the equation. Leave answers in trigonometric form. x^2 + 1 - sqrt3i = 0 2.) Give the rectangular coordinates for the point. (9, 2pi/3) 3.) The rectangular coordinates of a point are given. Express the point in polar coordinates with r L 0 and 0° K...
*December 8, 2014*

**Trig (math)**

1.) Write the complex number in trigonometric form r(cos theta + i sin theta) with theta in the interval [0°, 360°). 9 sqrt 3 + 9i 2.) Find the product. Write the product in rectangular form, using exact values. [4 cis 30°] [5 cis 120°] 3.) [4(cos 135° + i ...
*December 7, 2014*

**chemistry**

63.0 mL of a 1.30 M solution is diluted to a total volume of 248 mL. A 124-mL portion of that solution is diluted by adding 173 mL of water. What is the final concentration? Assume the volumes are additive.
*December 7, 2014*

**Algebra**

The table below shows the opening value of a stock on the first day of trading in various years. Write a 4th degree model for the data and use the model to estimate the value on the first day of trading in 2010. (1994,2814) (1996,3603) (1998,5429) (2000,3962) (2001,4117) (2004...
*December 7, 2014*

**accounting**

Amazon Appliance Company has three installers. Larry earns $355 per week, Curly earns $460 per week, and Moe earns $585 per week. The company's SUTA rate is 5.4%, and the FUTA rate is 6.2% minus the SUTA. As usual, these taxes are paid on the first $7,000 of each employee...
*December 7, 2014*

**Math**

For a savings account paying 2.4% in which interest is compounded MONTHLY. FIND THE Time needed to double the initial investment of 10000 dollars. The answer is 28.9 years but WHY
*December 7, 2014*

**language arts**

Ok. Do you think it's C? That sounds right to me
*December 7, 2014*

**language arts**

does anybody know?
*December 7, 2014*

**Pre Calc**

Log(x-6) +Log(x+3)=1 Solve for x I think it has no solution but why?
*December 7, 2014*

**Pre-Cal**

Log(x-6) +Log(x+3)=1 Solve for x thank u
*December 7, 2014*

**Pre Cal**

Solve for x Log(x-6) +Log(x+3)=1
*December 7, 2014*

**Pre-Calc**

Log(x-6) +Log(x+3)=1
*December 7, 2014*

**Stats**

In a sample of 400 voters, 360 indicated they favor the incumbent governor. The 95% confidence interval? I can't figure out what to do without a standard deviation!!!!!!!!
*December 7, 2014*

**Algebra**

The table below shows the opening value of a stock on the first day of trading in various years. Write a 4th degree model for the data and use the model to estimate the value on the first day of trading in 2010. (1994,2814) (1996,3603) (1998,5429) (2000,3962) (2001,4117) (2004...
*December 7, 2014*

**Science**

Thanks!!
*December 7, 2014*

**Science **

A geologist working in a national park finds a minerals. He is carrying a kit that contains a penny, a hand lens, a piece of tile, a geologic hammer, and a jackknife. Describe the geologist can use these items to determine some of the minerals characteristic.
*December 7, 2014*

**statistics**

The HIM department has 200,000 active medical records and the department received 12,081 records requests during the year. The QI indicator of the HIM department is Eighty-five percent of records requests will be located within 15 minutes. Of the 12,081 records in the question...
*December 7, 2014*

**Physics**

0.020
*December 7, 2014*

**Finance**

A family purchased a new ski boat for $20,000. The loan agency required a down payment and financed the balance for 36 months with an APR of Determine the total finance charge and monthly payment for the loan.
*December 7, 2014*

**statistics**

the hospital paper filing system contained 20,890 records. A total of 456 were identified as misfiled. What is the filing accuracy rate for the system? What is the percentage of misfiled records?
*December 7, 2014*

**Factoring**

Factor: 14z2 - 49z + 35 I got 7(z^2-7z+5) but I got it wrong? Please correct me.
*December 7, 2014*

**Physics**

A woman runs up a flight of stairs. The gain in her gravitational potential energy is 6500 J. If she runs up the stairs at half the speed, what is her gain in gravitational potential energy?
*December 7, 2014*

**Physics**

. How much potential energy does the 2.5 kg rock sitting on an 18 –meter high cliff have?
*December 7, 2014*

**Wilton Manor Elm**

Along with the flowers, Samantha bought 4 packages of glass beads and 2 vases. The vases cost $3.59 each and the total sales tax was $1.34. The total amount she paid was $28.50, including sales tax. Explaing a stratehy you would use to find the cost of 1 package of glass beads.
*December 7, 2014*

**Math**

Factor: 22n2 + n - 5
*December 7, 2014*

**Math - Calculus**

If 75100 dollars is deposited in an account for 13 years at 5.35 percent compounded continuously , find the average value of the account during the 13 years period. The average value in the account is ? ** im alittle confused in how to find the average value please help and ...
*December 7, 2014*

**Calculus**

Find the average value of the function f(x) 8x^2-9x+8 on the interval [3,5]. Find the value of the x-coordinate at which the function assumes it's average value The average value is ? the x-coordinate is ? Please help and showing work is much appreciated. Thank you
*December 7, 2014*

**solve**

A long distance trucker traveled 168 miles in one direction during a snow storm. The return trip in rainy weather was accomplished at double the speed and took 3 hours less time. What is the speed going?
*December 7, 2014*

**ashford university**

Theories of personality wk 1 assignment I don't understand it
*December 7, 2014*

**math 104**

A rocket engine, 2.44 cross product 10−5 watts/cm2
*December 7, 2014*

**Language Arts Help!**

It was limited
*December 6, 2014*

**chemistry**

One of the reactions involved in the smelting of copper sulfide ores involves copper(I) oxide and copper (I) sulfide: 2Cu2O(solid) + Cu2S(solid) ---> 6Cu(solid) + SO2(gas) Assuming that 35.00 g of copper (I) oxide is heated with 25.00 g of copper (I) sulfide. a) Determine ...
*December 6, 2014*

**general question**

Yes
*December 6, 2014*

**English**

Yes, and it seems like the characters are best suited for their given settings.
*December 6, 2014*

**English**

Yes, I listed them.
*December 6, 2014*

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