Friday

July 1, 2016
Total # Posts: 1,574

**Trig**

How do I do this? I punch the numbers into my calculator, and they don't work. B=sin^-1 (12/7 sin42\[Degree])
*December 8, 2010*

**MATH**

solve (x-3)(x+3)<0. xsquared-3x+3x-9 x squared=9 x=3
*December 8, 2010*

**algebra**

1/2x
*December 8, 2010*

**pre-algebra**

3x + 2x=5-6+6 5x=5 x=1
*December 8, 2010*

**Math**

a. 10% out of 100% failed A or 10/100 3% of 100% failed A & B or 3/100 3% that failed A(10%) also failed B or 3/10 b. 12% out of 100% failed B 3% out of 100% failed A & B or 3/12 c. failed A - 10% failed B - 12% sub total 22%(-3% counted double-failed both) = 19% total d. 100...
*December 8, 2010*

**college chemistry**

not sure I guess i put it down that way because im in college taking it.
*December 8, 2010*

**college chemistry**

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. State the methods by which a radiation oncologist can administer these therapies. ...
*December 8, 2010*

**college chemistry**

Discuss in detail, one way in which atomic nuclear decay takes place. What is the significance of atomic nuclear decay? Analyze the societal implications of using this process.
*December 8, 2010*

**Calculus**

assume the rate at which the world's oil is being consumed is r = 27 e^0.06 t. Here, just as in your book, r is in billions of barrels per year, t is in years, and t = 0 is January 1, 1990. (a) Fill in the blanks below to express the definite integral which measures the ...
*December 6, 2010*

**Calculus**

∫4 [( ( ln(z) )^ 2)/z] dz ∫[( 7 e^(7 √x))/ √x] dx ∫[(2 x + 5)/( x^2 + 5 x + 2)] dx
*December 5, 2010*

**physics**

A pilot wants to fly west (ie., the resultant is west). If the plane has an airspeed of 9.5 m/s, and there is a 25m/s wind blowing north, in what direction must she head the plane?
*December 3, 2010*

**arithmetic**

a recipe for rice pudding uses 1/2 cup of rice and serves 6 people. write the cups of rice per person as a unit rate . how many cups of rice do you need to serve 75 people?
*November 29, 2010*

**Chemistry**

The following isotopes (listed with their half-lives) have been used in the medical and biological sciences. Arrange these isotopes greatest to least decay activity. (Use the appropriate <, =, or > symbol to separate substances in the list.) ^3H (12.2 years) ^24Na (15 ...
*November 27, 2010*

**Chemistry**

How did you get N?
*November 27, 2010*

**Chemistry**

Each of the following nuclides is known to undergo radioactive decay by production of a beta particle, ^0_-1e. Write a balanced nuclear equation for each process. (Use 'e' for an electron, 'p' for a positron, and 'n' for a neutron. Omit states-of-matter...
*November 27, 2010*

**physics**

A 50.0 kg girl bounces up and down on a pogo stick. The girl has an instantaneous acceleration of 2.0 m/s^2 when the displacement is -8.0cm. What is the spring constant of the pogo sticks spring?
*November 24, 2010*

**physics**

Find the length of a pendulum that has a frequency of 0.80 Hz?
*November 24, 2010*

**physics**

A 0.025 kg object vibrates in SHM at the end of a spring. If the maximum displacement of the object is 0.030 cm, and its period is 0.50s, what is the maximum acceleration of the object?
*November 24, 2010*

**physics**

A 0.11kg mass is vibrating at the end of a horizontal spring along a frictionless surface. If the spring constant is 0.52 N/m, what is the displacement of the mass when the acceleration of the mass is 0.25m/s^2?
*November 24, 2010*

**physics**

A man is pulling on a rope with a force of 53 N directed at an angle of 70◦ to the horizontal. What is the x-component of this force? Answer in units of N.
*November 22, 2010*

**algebra**

Convert to a logarithmic equation: 9y = 6561
*November 21, 2010*

**CHEMISTRY**

For the reaction 3 O2(g) reverse reaction arrow 2 O3(g) If the equilibrium mixture is analyzed and [O2(g)] is found to be 3.77*10-2 M, what is the concentration of O3(g) in the mixture?
*November 21, 2010*

**Chemistry**

How to find the coefficient of Fe^2+ from ClO3^- + Fe^2+ --> Cl^- + Fe^3+
*November 21, 2010*

**Chemistry**

Which has the higher [H+], 0.40 M RbOH or 0.20 M Ca(OH)2?
*November 20, 2010*

**Statistics/Math- Please Help**

When comparing two independent population means, how do I find the degree of freedoms?
*November 15, 2010*

**Statistics**

When comparing two independent population means, how do I find the degree of freedoms?
*November 15, 2010*

**physics**

what is L?
*November 15, 2010*

**Calculus**

The velocity of a car (in miles per hour) is given by v(t) = 61.25t − 17.5 t^2 where t is in hours. Write a definite integral for the distance the car travels during the first 2.5 hours. Use your graphing calculator to find this distance. Distance =
*November 14, 2010*

**physics**

A 1500-kg car is making a turn with a 100.0-m radius on a road where the coefficient of static friction is 0.70. What is the maximum speed the car can go without skidding?
*November 7, 2010*

**physics**

A propeller blade has a period of rotation of 0.400s. What is the speed of the outer tip of the propeller blade if the tip is 1.20m from the hub?
*November 7, 2010*

**physics**

i apply an 800 N force to the crate a. how long would it take the crate to travel 20m across the warehouse floor(in the direction that i am pushing it)? b. what is the magnitude and direction of the force of friction acting on the crate?
*November 5, 2010*

**chemistry**

in an element on the periodic table, which number tells you the how many electrons are in that element??
*November 4, 2010*

**Physics**

Forces of 10.6 N north, 20.8 N east, and 14.3 N south are simultaneously applied to a 3.76 kg mass as it rests on an air table. What is the magnitude of its acceleration?
*November 1, 2010*

**Physics**

Forces of 10.6 N north, 20.8 N east, and 14.3 N south are simultaneously applied to a 3.76 kg mass as it rests on an air table. What is the magnitude of its acceleration?
*November 1, 2010*

**Physics**

Forces of 10.6 N north, 20.8 N east, and 14.3 N south are simultaneously applied to a 3.76 kg mass as it rests on an air table. What is the magnitude of its acceleration?
*November 1, 2010*

**Physics**

An object is released from rest. How far does it fall during the third second of its fall?
*October 26, 2010*

**chemistry**

yes, ive asked multiple people and they've all told me the same thing. i'll study the question the way you said, i have a test next week and i wanted to know how to solve problems like this,
*October 26, 2010*

**chemistry**

i already posted this question, but im still confused on it. Dinitrogentetraoxide partially decomposes according to the following equilibrium: N2O4 (g) -> 2NO2 (g) <- A 1.00-L flask is charged with 0.400 mol of N2O4. At equilibrium at 373 K, 0.0055 mol ofN2O4 remains. ...
*October 26, 2010*

**Chemistry Class**

I got the problem from my book, and it says the answer is 0.87?
*October 25, 2010*

**Chemistry Class**

Dinitrogentetraoxide partially decomposes according to the following equilibrium: N2O4 (g) -> 2NO2 (g) <- A 1.00-L flask is charged with 0.400 mol of N2O4. At equilibrium at 373 K, 0.0055 mol ofN2O4 remains. Keq for this reaction is ?. hOw can i set up this problem?
*October 25, 2010*

**5th grade**

*MAXIMUM 18 SO IT IS THE LAST # IN THE SET. *12 IS THE MEDIAN SO IT HAS TO BE THE MIDDLE #. IN A STRING OF 12 NUMBER, 12 WOULD HAVE TO BE THE 6 AND 7 # TO BE IN THE MIDDLE. *FOR 7 TO BE THE MODE, IT HAS TO BE A # USED MORE THAN ANY OTHER. *RANGE IS 13 WITH THE MAXIMUM 18, ...
*October 25, 2010*

**algebra**

How do I figure (17 + a)^ = 2209 I know a = 30, but how do I get the answer?
*October 22, 2010*

**physics**

why does the filament of a bulb does not melt though it heats more than 3400 degree celcius
*October 22, 2010*

**physics**

A loaded dogsled has a mass of 400kg and is being pulled across a horizontal, paced snow surface at a velocity of 4.0m/s (N). Suddenly, the harness separates from the sled. If the coefficient of kinetic friction for the sled on the snow is 0.0500, how far will the sled coast ...
*October 22, 2010*

**physics**

a ball rolls off an incline at an angle of 30 below the horizontal at a velocity of 22m/s. how far from the base will the ball hit the floor if it lands in 3s?
*October 14, 2010*

**sentence writing**

hmm
*October 14, 2010*

**psychology**

Advertisers have been using the principles of classical conditioning for years in attempts to associate pleasant feelings with their products. One particular genre of ads (for beer) is particularly famous for doing so by placing scantily clothed women holding beer bottles on ...
*October 13, 2010*

**college organic chemistry**

Give the product of the substitution reactions. (CH3)2CHOSO3CH3 -> ?
*October 13, 2010*

**chemistry**

how many C atoms are in 1.50 moles of lactic acid?
*October 10, 2010*

**chemistry**

how many grams of NaOH do you need to prepare a 3.00 x 10^2 mL stock solution of 2.00 M NaOH
*October 7, 2010*

**Physics**

Free Fall: Tara throws a baseball down to Nathan. If she throws it with a speed of 2.0m/s and it lands in Nathan's hand with a speed of 10.0m/s, how far above Nathan is Tara?
*October 5, 2010*

**Physics**

Thank You.
*September 30, 2010*

**Physics**

Oh I see. What does that have to do with Galileo? I know about his objects with different masses don't determine which will fall first. Is there another concept?
*September 30, 2010*

**Physics**

It's moving 2 meters every second.
*September 30, 2010*

**Physics**

If I calculate the time, I get 1.3seconds. I assumed the ball is moving changes its velocity every 1.3 seconds?
*September 30, 2010*

**Physics**

A ball is rolling on a track with an intial velocity of 2.0m/s, E. If the acceleration is 1.5 m/s2, write a sentence that describes the ball's motion, i.e, what does the ball do each second?
*September 30, 2010*

**College Eng 2**

Im writting an argumentive paper on standardize test and I need an attention grabber.
*September 30, 2010*

**Chemistry**

2N2O(g) → 2N2(g) + O2(g) d[N2O]/dt = -5.8×10-4 M/s at a particular temperature and set of concentrations. What are d[O2]/dt and d[N2]/dt? d[O2]/dt = d[N2]/dt = What is the rate of the reaction? my answer for the first one im getting -.00016 and the second one 2.9e-...
*September 29, 2010*

**DrBob222**

2N2O(g) → 2N2(g) + O2(g) d[N2O]/dt = -5.8×10-4 M/s at a particular temperature and set of concentrations. What are d[O2]/dt and d[N2]/dt? d[O2]/dt = d[N2]/dt = What is the rate of the reaction? my answer for the first one im getting -.00016 and the second one 2.9e-...
*September 29, 2010*

**geography**

name at least 5 bodies of water ? what are they thank you
*September 29, 2010*

**Math homework**

oh... 3-(-4+8)=3-[-4+(-8)] 3-(-12) 3+12 15=3-[-4+(-8)] 15=3+12 15=15
*September 27, 2010*

**Math homework**

what are you solving for?
*September 27, 2010*

**Math homework**

3-8+3-8+2 =-5+3-8+2 =-2-8+2 =-10+2 =-8
*September 27, 2010*

**social studies**

It was an attempt to prevent colonial tensions with Native Americans by establishing the western boundaries of the 13 coastal colonies.
*September 27, 2010*

**CHEM**

It is an alloy of copper and zinc, therefore it is a mixture, since a compound is chemically formed while an alloy is just a dissolving of one metal in another.
*September 25, 2010*

**phsyics**

A baseball is thrown straight up. The drag force is proportional to v^2. In terms of g, what is the y-component of the ball's acceleration when its speed is half its terminal speed and it is moving up? In terms of g, what is the y-component of the ball's acceleration ...
*September 23, 2010*

**Chemistry**

Why would it be better to titrate a solution rather than just dilute it?
*September 21, 2010*

**University Research-level Biology**

Hello, this is an upper-level question, and I would sincerely appreciate help before Tuesday. I am reading a journal article, and there is one conclusion in it that I do not understand. It predicts a postsynaptic mechanism when EPSP amplitudes do not vary across trials, and a ...
*September 20, 2010*

**math**

expand 9x - 36 + x = 10x - 40 + 4 put like terms on the same side 9x + x - 10x = 36 - 40 + 4 simplify 0=0 Well your question doesn't make sense.
*September 20, 2010*

**English**

6) We have afternoon classes on Tuesdays from 2pm to 4pm. 7) I prefer scientific subjects such as physics and maths to humanities. 8) We are tested orally twice a term and we get three written marks each term (is there a better way of expressing it??). 9) A calendar and an ...
*September 19, 2010*

**Math**

Hello everybody
*September 19, 2010*

**physics**

At a picnic, there is a contest in which hoses are used to shoot water at a beach ball from three directions. As a result, three forces act on the ball, F1, F2, and F3 (see drawing). The magitudes of 1 and 2 are F1 = 55.0 newtons and F2 = 95.0 newtons. Using a scale drawing ...
*September 12, 2010*

**physics**

They will hit the ground at the same time. the accelerate at the same rate of 9.8m/s^2
*September 10, 2010*

**Math**

2x cubed minus x squared minus 6x plus 3. I know the answer is (2x-1)(x squared-3). Please help me with how they got that answer. Thank you!
*September 9, 2010*

**Math**

2x cubed minus x squared minus 6x plus 3. I know the answer is (2x-1)(x squared-3). Please help me with how they got that answer. Thank you!
*September 9, 2010*

**s.s.**

Spain and Portugal
*September 9, 2010*

**Geography**

Why is Cairo an important city?
*September 9, 2010*

**9th grade math**

Correct. 3/4 times 3/4 equals 9/16
*September 9, 2010*

**Geography**

THanks
*September 9, 2010*

**Geography**

Why is rice important to the Middle East?
*September 9, 2010*

**chemistry**

If a soda can is 11.8 cm tall, how many would it take to make a stack to reach the moon?
*September 6, 2010*

**calculus**

PLEASE write 2x+y=5 in polar form. a. -sqrt5 = r cos (theta -27degrees) b. sqrt5 = r cos (theta -27degrees) c. -sqrt5 = r cos (theta +27degrees) d. sqrt5 = r cos (theta +27degrees) is the answer c.
*September 6, 2010*

**Health, Safety, and Nutrition**

a or d
*September 5, 2010*

**health**

prefix of osterperosis
*September 3, 2010*

**math**

=8-2[3-(15x+5)] =8-2[-15x-2] =8+30x+4 =30x+12
*September 2, 2010*

**Finance**

I have this same problem. I just cannot figure out if the labor content is needed to calculate the NPV. Any ideas?
*August 31, 2010*

**math116**

I need help with 3(x-1)+5=15x +7-4-4(3x+1)+ 3
*August 31, 2010*

**Math**

An equilateral triangle is one in with all three sides are length. If two vertices of an equilateral trangle (0,4) and (0,0), find the third vertex. How mant of these triangles are possible? How would you slove this??
*August 26, 2010*

**calculus**

Thanks I see where I made the mistake Thank you!
*August 17, 2010*

**calculus**

The total area enclosed by the graphs of y=10x^2–x^3+x y=x^2+19x This is a really long problem I keep getting the answer of 20.25 but it is incorrect I dont know where I am going wrong?
*August 17, 2010*

**finance**

Leggio Corporation issued 20-year, 7% annual coupon bonds at their par value of $1,000 one year ago. Today, the market interest rate on these bonds has dropped to 6%. What is the new price of the bonds, given that they now have 19 years to maturity
*August 8, 2010*

**American History**

What two colonies were resistant towards slavery?
*July 31, 2010*

**Chemistry**

If a diagram describes an initial state of the reaction A2 + B2 --> 2AB. Would the picture with more AB products represent the result at the higher temperature?
*July 17, 2010*

**Chemsitry**

I don’t understand how to write this equation. Write an equation relating the concentration for a reactant A at t=0 to that at t=t for a first-order reaction. Define all the terms, and give their units. Do the same for a second- order reaction. -Would it be the rate law ...
*July 17, 2010*

**Chemistry**

How would you solve this problem? C4H8(g)--> 2C2H4 Determine the order of the reaction and the rate constant based on the following pressures, which were recorded when the reaction was carried out 430 C in a constant volume vessel. Time (s) P(C4H8)(mmHg) 0 400 2,000 316 4,...
*July 17, 2010*

**other**

why do u say d??
*July 15, 2010*

**other**

some child psychologists have concluded that___ is the strongest predictor of both scholastic and career achievement A. physical illness b. respect for authority c. emotional well being d inherited intelligence
*July 14, 2010*

**other**

Encouraging children to eat certain foods their families enjoy aroud the holidays is an example of?
*July 13, 2010*

**College Physics**

An airplane flies 200 km due west from city A to city B and then 240 km in the direction of 31.0° north of west from city B to city C. (a) In straight-line distance, how far is city C from city A? (b) Relative to city A, in what direction is city C?
*July 5, 2010*

**chemistry**

A silver ring contains 0.0134 mmol Ag. How many silver atoms does it contain?
*July 2, 2010*