Saturday

February 28, 2015

February 28, 2015

Total # Posts: 65

**Precal**

If 80 percent of radioactive element is left after 250 years, then what percent remains after 600 years? What is the half life of the element?
*December 11, 2014*

**physics**

A baseball is thrown vertically upward with a speed of 17.8 m/s from a height of 1.11 m. How high does the ball rise from its original position?
*September 18, 2014*

**science**

who knows the answer!?
*March 31, 2014*

**Algebra**

An inheritance of $19,000 was divided among three investments yielding a total of $1490 in simple interest per year. The interest rates for the three investments were 5%, 7%, and 10%. The 5% and 7% investments were $4000 and $1000 less than the 10% investment, respectively. ...
*September 12, 2013*

**english**

In the third century, bands of savage barbarians repeatedly broke through the frontier defenses of the Roman province of Gaul,_________the countryside with fire and sword, and either slew or carried off the____ a. scanned..partisans b. pacified..vagabonds c. devastated.....
*December 11, 2012*

**chem**

Using data from the following reactions and applying Hess's law, calculate the heat change for the slow reaction of zinc with water (answer must be in kJ/mol Zn): Zn(s) + 2 H2O(l) ----> Zn^2+(aq) + 2 OH-(aq) + H2(g) (ΔHrxn = ?) H+(aq) + OH-(aq) ----> H2O(l) (&#...
*October 15, 2012*

**Math ( Palette of Problem)s)**

40 people at a beach or water skiing 9 of the 12 people decide to swim.how many people are not on the beach?
*May 21, 2012*

**physics**

A sphere has a radius of 0.20 meters and has a uniform surface charge density equal to 6.3 micro coulombs per meter squared. A second point charge has a magnitude of 0.58 micro coulombs and is 0.61 meters away from the center of the sphere. Find the magnitude of the force ...
*March 17, 2012*

**chemistry**

when burned, methane gives off heat at a rate of 342 J/g. How many kilojoules of heat will be given off when 4.50 kg burns?
*November 14, 2011*

**Statistics**

5 and 22
*November 4, 2011*

**science**

spent steam from an electric generating plant leaves the turbines at 120.0 C and is cooled to 90. 0 C liquid water by water from a cooling tower in a heat exchanger. How much heat is removed by the cooling tower water for each kg of spent steam?
*October 13, 2011*

**social studies**

Thank you!
*September 1, 2011*

**social studies**

name two things colonial leaders offered to attract settlers
*September 1, 2011*

**math**

-4=(7x-(-1))/-8
*July 18, 2011*

**Chemistry Molarity**

1.5 M
*March 28, 2011*

**math**

from agroup of 18 kids how many ways can you choose a group of 4 to do a project
*March 14, 2011*

**microbiology**

In a solution, the substance present in the largest amount is referred to as the solvent. Consider adding one ounce of oil to one gallon of water. Using terms, such as solute, solvent, polar, non-pola
*January 25, 2011*

**Math**

28.35
*January 17, 2011*

**Statistic**

I am getting problems with my calculations. For the first part of the question I got 68 when I try another calculation I got 1. One of the method used was Degree of freedom =(r-1)(c-1). TABLE 12-7 The director of transportation of a large company is interested in the usage of ...
*October 24, 2010*

**Chemistry**

N_2+3H_2-->2NH_3 How many grams of H_2 are needed to react with 3.20 grams of N_2
*October 23, 2010*

**chemistry**

If you have 1.90 moles of H_2 How many grams of NH_3 can be produced?
*October 23, 2010*

**English**

I will try this again. I have to identify the verb and tell if it's transitive or intransitive. It is related to wheat, oats, and barley. is related=intransitive In Japan the hollow stems serve as water pipes. serve=intransitive
*October 18, 2010*

**English**

I'm having trouble with transitive and intransitive verbs. I have to pick out the verb and tell if it's transitive or intransitive. Some reach a height of 120 feet. reach=intransitive The stems measure a foot in diameter. measure=intransitive
*October 18, 2010*

**English**

Support local farming Reasonable distance so it doesn't travel as far Those are my 2 ideas so far
*October 5, 2010*

**English**

Slow Food vs. Fast Food Why is it better to buy local products for slow food? This is one of my bullets for an English essay.. I just need some guidance on how to set this up and main points.
*October 5, 2010*

**physics**

The engineer of a Russian nuclear submarine lurking under the Arctic Sea reports an outside pressure of 35 ATM. How deep is the submarine? Neglect ice thickness.
*September 30, 2010*

**OChem**

A mixture of acetone and ethyl acetate of unknown ratio begins to boil at 65 degrees celcius (760 torr). What is the composition of this binary mixture in terms of the mole fraction of acetone and that of ethyl acetate?
*September 25, 2010*

**criminal justice**

where would i find real world examples that i could cite in apa format
*June 29, 2010*

**Physics**

Thank you! I see where I went wrong
*May 25, 2010*

**Physics**

Sorry here's the picture: img245.imageshack.us/img245/3526/2505100050.jpg
*May 25, 2010*

**Physics**

What is the acceleration of the upper block? The coefficient of kinetic friction between the lower block and upper block is 0.0005. The coefficient of kinetic friction between lower block and floor is 0.0001. Upper block is 1kg, lower block is 2kg, and Force of 20N is applied ...
*May 25, 2010*

**english**

Select the sentence that is punctuated correctly. Zora’s lemon tree produces too much fruit. She gives them away therefore, to her friends and neighbors. Zora’s lemon tree produces too much fruit. She gives them away, therefore, to her friends and neighbors. Zora&#...
*May 19, 2010*

**Chemistry**

What is the net ionic equation for the ionization of HClO3 in water?
*May 10, 2010*

**microbiology**

list the 5 main processes of diagnosis of a bacterial infection.
*April 29, 2010*

**English Comma splices and run on sentences**

1. The following sentence is an example of proper comma usage: “Many students anticipate spring break but, Luis looks forward to winter vacation more true or false
*April 22, 2010*

**Math**

The number of daylight hours in a day is harmonic. Suppose that in a particular location, the shortest day of the year has 7 hours of daylight and the longest day of the year has 18 hours. Then, we can model its motion with the function N=Asin(Bt) + C where t is expressed in ...
*September 28, 2009*

**Trigonometry**

The number of daylight hours in a day is harmonic. Suppose that in a particular location, the shortest day of the year has 7 hours of daylight and the longest day of the year has 18 hours. Then, we can model its motion with the function N=Asin(Bt) + C where t is expressed in ...
*September 28, 2009*

**bio**

5. What is meant by the term “carbon fixation”? a. The release of CO2 from glucose during catabolism b. The delivery of CO2 to an enzyme required for the production of glucose c. The production of two 3-carbon molecules from one 6-carbon molecule d. The production of...
*April 6, 2009*

**bio**

4. In the Krebs cycle (or citric acid cycle), starting with citrate, what happens? a. Organic compounds become more reduced and CO2 is produced b. Organic compounds become more oxidized and CO2 is produced c. Some organic compounds become reduced and electron carriers become ...
*April 6, 2009*

**social studies**

Mayflower compact was written by the pilgrims which also sailed across the Atlantic on the Mayflower
*November 5, 2008*

**Algebra**

The order is not important. The answer is x=-2 or x=1 Verify by substituting for x 2(-2)^2+2(-2)-4=0 8-4-4=0 0=0 2(1)^2+2(1)-4=0 2+2-4=0 0=0
*May 23, 2008*

**Math**

You left out information in your equation. The equation I find for this is D=sqrt(13h). The equation in your book may be differnt. Solve for h D^2=13h h=(D^2)/13
*May 23, 2008*

**Math**

determine vertex, focus and directrix of parabola. then graph the parabola. second equation: y^2 -4y -12x= 8 Please help me this is do 2day bc i forget to turn it in to my teacher
*May 18, 2008*

**Math**

determine vertex, focus and directrix of parabola. then graph the parabola. second equation: y^2 -4y -12x= 8
*May 18, 2008*

**Math**

determine vertex, focus and directrix of parabola. then graph the parabola. first equation: y^2 -2x-8=0 second equation: y^2 -4y -12x= 8 please show your work!
*May 18, 2008*

**math**

determine vertex, focus and directrix of parabola. then graph the parabola. first equation: y^2 -2x-8=0 second equation: y^2 -4y -12x= 8
*May 18, 2008*

**accounting**

72,000.
*May 9, 2008*

**accounting**

30,000*50*.05=75,000
*May 9, 2008*

**Algebra**

slope intercept is y=mx+b. Find the slope (m) using the points. (delta y / delta x). Then substitute a point to find b.
*May 5, 2008*

**Math, derivatives**

You're on the right track. sin 2x= 2sin x cos x (identity) substitute into your first answer. f'(x)=2x-2(sin2x) f'(x)=2(x-sin2x)
*May 5, 2008*

**physics**

Best guess - molecular model
*May 5, 2008*

**Grade 12 Biology**

It should be in your book under kidney functions. Evaluation of Kidney Function A urinalysis is an analysis of the volume and physical, chemical, and microscopic properties of a urine sample. Chemically, normal urine contains about 95% water and 5% solutes. The solutes ...
*May 5, 2008*

**Physics**

M1*V1=M2*V2 Whichever has the most momentum will win. Just multiply MassxVelocity and compare.
*May 5, 2008*

**Math**

Divide 40 by 2.
*May 4, 2008*

**Physics**

Force of gravity= gravitational constant x Mass1 x Mass2 /r^2 so if Mass1 increases by 4 and the other by 2 then it would increase by 8. Between 2 objects, Inverse Square Law: Gravity at A = gravity at B × (distance B / distance A)2 It would be (1/4)^2 or 1/16
*May 4, 2008*

**scienc**

range of tolerance because the organism has to react to it's environment. It can't control it.
*May 4, 2008*

**math**

Length is 6 less than 3xwidth so L=3W-6 Perimeter = L+L+W_W or 2L+2W Perimeter is 100m so 2L+2W=100 You have 2 equations and 2 unknowns so you can solve it.
*May 4, 2008*

**business calculus**

Draw a picture of the problem. You should get to the forumlae 700=24L+84W with basic math. Solve for L (or W). A=LxW. Maximum Area occurs when derivative = 0. Take derivative and solve for L (or W).
*May 3, 2008*

**ss**

what mountain range runs along the western coast of south america?
*February 28, 2008*

**biology-mitosis**

Size
*November 27, 2007*

**Math**

In algebra terms, you could look at the problem like this: A. Set your variables. Do this by thinking about which parts of the problem can change. For this problem, there is the height of the final bounce, the height of the building, and the number of bounces. 1) h = Height of...
*October 30, 2007*

**pre-calc**

c zero
*March 8, 2007*

**science**

The Earths Interior: "Ability of a solid to flow or change shape like a thick liquid." It is one word. The third letter is an (A)and it is 10 letters long. plasticity
*January 9, 2007*

**Chemistry**

Calculate the work done when 70.0g of tin dissolves in excess acid at 3.00 atm and -15.0 C. Sn(s)+2H^+(aq) -> Sn^2+(aq)+H2(g) Assume ideal gas behavior. Any ideas? I've come up with a few different answers and can't come to a conclusion. I see the following energies...
*September 15, 2006*

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