Saturday
December 3, 2016

Total # Posts: 169

Math
Bart and Bethany play a game. They each roll a regular 6-sided die labeled 1to 6. Use an outcome table to show all possible outcomes: (2 marks) is the total number of outcomes 12?
November 23, 2016

Chemistry
Solid CuCl2 is 2.03g Fe before reaction reaction 2.0072g Decrease in nail mass 0.32239
October 13, 2016

Chemistry
Assume that the reaction was limited by the surface area of the nails, making Fe the limiting reactant. Based on the decrease in the mass of nails, calculate theoretical yield of copper. 2Fe+3CuCl2--->2FeCl2+3Cu
October 13, 2016

Calculus
I cannot figure out how to simplify this.
October 2, 2016

Calculus
find the intervals on which f is increasing and decreasing f(x)=(x-2)/(X^2-x+1)^2 I found the derivative a got a whole mess of things: ((x^2-x+1)^2-2(x^2-x+1)(2x-1)(x-2))/(x^2-x+1)^4 Do I have to use the quadratic formula to solve for the vertices to find where it is ...
October 2, 2016

Chemistry
Prepare 30mL of a stock KI soln by mixing 10.0mL of the 0.03M KI in 0.2M KNO3 with 20.0mL of the .2M KNO3 Determine the concentration of the iodide ion. What does it mean by the 0.03M KI in 0.2M KNO3? Is this just bad wording of the question? Am I just mixing the 10.0mL of ....
October 2, 2016

Chemistry
A student prepares a soln that is initally 0.006M Pb2+ and 0.00450M I-. This soln is placed into a 1.00cm wide cuvet and inserted into the spectrometer producing as abosrbance reading of 0.430 at a wavelength of 456nm. What is the equilibrium concentration of the iodide ions ...
October 2, 2016

Chemistry
If the concentration of KCN at the equivalence point is 0.1M and the Ka for HCN is 6.2*10^-10 find the pH at the equivalence point. The reaction is between KOH and HCN From my understanding I have to do a stoichiometric calculation and then use the Henderson-Hasselback ...
September 28, 2016

Math
How many 2's must be multiplied together for the product to be a number between 100 and 200?
September 11, 2016

Geometry
The formula for area of a square is a^2. The find the length of a side reverse the formula by finding the square root of 196.
May 10, 2016

science
Can somebody help me understand batteries? I'll explain what I know, then, you can tell me if I'm right or wrong. I know that a battery consists of three main parts: the anode, the cathode, and an electrolyte. The anode is electropositive and the cathode is ...
May 10, 2016

Social Studies
March 9, 2016

Chemistry
How many grams of NaNO2 must be added to 1 liter of 1.00 M HNO2 solution in order to prepare a buffer solution with pH = 4.14? pH = 3.14? My work: ka = pH(buffer ratio) 4.5 * 10^-4 = 1.000*10^-4.14 (x M of base/1.00 M of acid) x = 6.21 6.21 M = (6.21 moles/1 L)(1 L) = 6.21 ...
February 21, 2016

Physics
A 35 micro coulomb point charge is placed 32 cm from an identical 35 micro coulomb charge. How much work would be required to move a 0.5 micro coullomb test charge from a point midway between them to a point 12 cm closer to either of the charges?
February 11, 2016

Physics
A large statue in a crate is being moved. The mass of the statue and the crate is 150 kg. As the statue slides down a ramp inclined at 40.0°, the curator pushes up, parallel to the ramp’s surface, so that the crate does not accelerate. If the statue slides 3 m down ...
December 5, 2015

Math
it would be 111164774.000000001
December 1, 2015

PreCalc
Sqrt of 9sin^2x Is the answer |3sinx|? Is the three included in the absolute value sign? My teacher is very picky and I need to fully understand this concept. Thank you.
October 16, 2015

PreCalc
Graph y=2csc(x-π) New period that I solve for 0<x-π<2π π<x<3π What is my quarter period? I got that it was 3π/4 but when I add this to pi 4 times o reach 4π instead of 3π. Please help.
October 11, 2015

Algebra
August 15, 2015

SOLVED
I figured it out after staring at what steps I already had written down.
August 15, 2015

Algebra
Rationalize the denominator. The twos are outside of the square root signs. 5/(sqrt14)-2 x (sqrt14)+2/(sqrt14)+2 The answer is sqrt14+2/2 I am having trouible understanding hoe to get rid of the 5
August 15, 2015

Algebra 2
Which of the following equations represents the line that is parallel to the line y=5x+2 and that passes through the point (1,-3)?
August 12, 2015

Physics
Two tuning forks are struck at the same time; one with a pitch of 410Hz one a frequency of 500Hz. How many pitches do you hear and what are the frequencies?
May 20, 2015

Social Studies
I have no clue...
May 6, 2015

Social Studies
Read the passage and answer the question that follows: John Brown, supported by abolitionists and Republicans, tried to start a slave revolt. Therefore be it resolved that the defense of slavery is a common cause to all Southern states. At the call of any Southern state, we ...
May 6, 2015

Chemistry
The volume of the nitrogen gas is 125ml atmospheric pressure is 763mm Hg Water temperature is 24 degrees Celcius. The water level inside the eudiometer is the same as the level of water in the beaker. Calculate the pressure of the dry nitrogen gas. PH2=Ptotal-PH2O PH2=763 mm ...
April 9, 2015

Chem
April 9, 2015

Chem
If a .750g sample of magnesium chloride is dissolved in water and then treated with a silver nitrate solution how many grams of silver chloride should be collected? I don't understand what my first step should be. The balanced equation is MgCl2+2AgNO3=2AgCl+Mg (NO3)2 Do I ...
April 9, 2015

chemistry
8.778 KJ/Mole
March 16, 2015

Math
Fin the value of Theta if sec theta=3 I inverted the value of sec theta to get cos theta=1/3 I then said Theta=cos-1 (1/3) Is thus correct? What is the answer rounded to the tenths place?
February 18, 2015

Trigonometry
Find cotangent theta given that cosecant theta equals -3.5891420 and theta is in the third quadrant. I was using the trig identity 1+cot^2theta=csc^2theta I wanted to isolate cotangent so I plugged in 1/sin (-3.5891420) and then squared my answer. I then subtracted one from ...
February 9, 2015

Chemistry
32.0=5.5x10^2(1/T)+14.2 Solve for T I am confused about what the first step would be to solving for T. Would I divide 5.5x10^2(1/T) and move it to the left side? Please help.
January 28, 2015

Algebra
32.0=5.5x10^2(1/T)+14.2 Solve for T I am confused about what the first step would be to solving for T. Would I divide 5.5x10^2(1/T) and move it to the left side? Please help.
January 28, 2015

Algebra
January 28, 2015

Science-Chemistry
Thank you very much DrBob222
January 28, 2015

Science-Chemistry
January 28, 2015

Chemistry
January 28, 2015

science
i need help with more questions in the packet heres my question the poisonous gas hydrogen sulfide, H2S, can be neutralized with a base such as sodium hydroxide, NaOH. THE unbalanced equation for this reaction follows: NaOH(aq)+H2S(g)→Na2S(aq)+H2O(l) a student who was ...
January 12, 2015

science
i need help with a packet that im struggling with my questions are write the total number of atoms present for the following questions: a. 4SO2 now i tried and got 8O'S and 1S b. 8O2 i tried and got 16 all together c. 3Al2(SO4)3 i tried and got 6Al, 3S, and 12O my next ...
January 12, 2015

chemistry
i have a homework packet that i am struggling with can you please help me my first question is i have to finish the following equation to balance it out my question is 3Fe3O4+blankAl→blankAl2O3+blankFe now i tried and i got 3Fe3O4+2A=2Al2O3+2Fe i don't know if that&#...
January 12, 2015

physics
Doesn't that just give me back my original equation of mgy=kx^2?
December 14, 2014

physics
I need some help with determining the equation for this problem. "The block of mass m is released from rest on the frictionless incline. After sliding a certain distance, it compresses a spring and comes to rest at a distance of y beneath its original position. How much ...
December 14, 2014

Chemistry
2.59 Degrees
December 6, 2014

on the internet
November 7, 2014

Math
no anna was right I got 5/5 %100
November 5, 2014

Chemistry
3p orbitals 2sp and 2p orbitals 6sp3d2 orbitals
May 2, 2014

Algebra
Thank you sooo much!!!
April 16, 2014

Math
Jason Printing has \$85,000 to invest. They can invest in Wilder Revenue at 10% compounded semiannually or at Cheapskate Investments at 9.8% compounded monthly. a) Calculate the two APYs and compare them to determine your answer. Make sure to distinguish which APY belongs to ...
April 15, 2014

Math
Jason Printing has \$85,000 to invest. They can invest in Wilder Revenue at 10% compounded semiannually or at Cheapskate Investments at 9.8% compounded monthly. a. Calculate the two APYs and compare them to determine your answer. Make sure to distinguish which APY belongs to ...
April 14, 2014

algebra
Show all steps, combine like terms what is a simple form of the expression-3(-4y+3)+7y
February 23, 2014

algebra
Solve the compound inequality-2<2x-4<4 answers are 0<x<-2,, 1<x<4, 1<x<0,, 3<x<6
February 23, 2014

algebra
Name the property of real numbers illustrated by the equation 2·(8·7)=(2·8)·7 answers are. Distributive property ,associative property multiplication, Communicative property multiplication, Associative property addition
February 23, 2014

PreCalc
stacey is standing 5 miles west of the control tower at an airport. A plane took off traveling directly north of the control tower at a rate of 180 mph along the ground at a constant angle of 15 degrees. A)after 12 minutes, what is the angel between Stacey and the plane along ...
February 9, 2014

math
WHAT no that is so inappropriate plus cant you get band from this sight
December 9, 2013

Calculus!!!
A piece of wire 28 m long is cut into two pieces. One piece is bent into a square and the other is bent into a circle. (a) How much wire should be used for the square in order to maximize the total area? (b) How much wire should be used for the square in order to minimize the ...
November 5, 2013

Maths
Hi I have a maths problem I can't figure out please someone help. Zac had some 2c stamps and 5c stamps.he needed to put 30c on a postcard to mail it.what combinations of stamps could he use.
August 13, 2013

physics
An oven is plugged into a 120 V electrical outlet and "cooks" the food by using a 144 ohm resistor light bulb that converts electrical energy to both light and heat energy. If the light bulb converts 75% of the electrical energy to thermal energy, and the oven is ...
May 30, 2013

physics
A 5.0 ball is initially sitting at rest on top of a 41 m high hill. The ball is pushed with a force of 25 N for 3.0 s toward the edge of a hill. Upon reaching the edge, the ball is allowed to roll down the hill where it reaches the flat ground. To the nearest mile per hour, ...
May 30, 2013

algebra 2
two resistors are connected in parallel. their resistances are 8 ohms and 17ohms. what is the resistance of the combonation.
May 27, 2013

algebra 2
if a rock is dropped from the top of a 200 ft building, solve for the time it takes for it to hit the ground. (when h=0) hint-initial velocity when dropped is 0
May 26, 2013

Math- Precalculus
Write the expression as the sine, cosine, tangent of an angle (in radians.) (tan(pi/5)-tan(pi/3))/(1+tan(pi/5)tan(pi/3))
May 20, 2013

Math
April 22, 2013

Math
Solve. 10/3x + 4/3 = 7 + x/2x A) x = 1/3 B) x = 17/5x C) x = 1/5 D) x = 1/6 thinking it's A.. help?(:
April 22, 2013

Math
Solve. x+12/x+4 = x/x+8 A) x=-4 B) x=8 C) x=6 D) x=-6 thinking that it's B.. help?(:
April 22, 2013

Physics
Thank you!
February 3, 2013

Physics
Two resistors 3 Ù and 6 Ù are connected in parallel across a 6 V battery. What is the current flow through the 3 Ù resistor?
February 3, 2013

Algebra 1
What is 5x cubed over x squared multiplied by 3x to the fourth power over 6x?
November 27, 2012

math
A pair of dice is rolled once. suppose you lose \$9 if the dice sum to 9 and win \$11 if the dice sum to 4 or 6. how much should you win or lose if any other number turns up in order for the game to be fair?
October 23, 2012

statistics
How do you calculate the degrees of freedom for unequal sample sizes and unequal variance (independent t test)
October 6, 2012

Predicate and subjects
1. The smell of cooking is delicious to the hungry camper. 2. A good fire is difficult to build. looking for simple subject and predicate 1, smell. Predicate. Camper subject 2. Fire subject. Build predicate
September 30, 2012

chemistry
A reaction has ÄH = -378 kJ and ÄS = -37 J/K. Calculate ÄG at 25°C to confirm that the reaction is spontaneous. in kJ
May 15, 2012

chemistry
4 FeO(s) + O2(g) ¨ 2 Fe2O3(s) calculate value of delta H i have done this 4(-272.0)+0->2(-825.5) and the products minus reactants and i got -563 but it is not right?!
May 14, 2012

chemistry
thanks helped with a different question
May 14, 2012

chemistry
nevermind i found it -687
May 14, 2012

chemistry
on my selected thermodynamic data i cant find delta H for SiCl4(L) (i can solve the reaction i just cant figure out what SiCl4(L) is.
May 14, 2012

chemistry
EXTRA CREDIT QUESTION(this is like kinda really hard for me at the moment i got the first one but the others not so much) The city of Celina was ordered by the Ohio EPA in 2003 to resolve its MCL (maximum contaminant level) violations of its drinking water. The Celina water ...
April 26, 2012

Physics
Find the frequency of a wave whose period is 0.320s.
April 12, 2012

Chemistry
I am having trouble answering this. please help! Q: Cereol is a newly discovered compound in corn flakes. A biologist suspects that it increases mental ability. She is making a solution to test on rats. First she makes a stock solution. She discovers that this is too ...
March 31, 2012

spelling
I need to call my lawyer
March 7, 2012

Math
March 7, 2012

Square roots
No its isn't that I found how you do it that would part of it.
March 7, 2012

Square roots
The diagonal of a square has length square root 2 X s, where s is the length of a side of the square. What is the length of the diagonal in a square with sides that are 13 cm? Round your answer to the nearest tenth.
March 7, 2012

Physics3
The answer is 2. Fnet=Sqrt of 2 F
February 12, 2012

science
A 68.4g sample of Potassium Chloride was added to 200g of water at 20 degrees celsius. Is the solution saturated, unsaturated, or supersaturated?
January 3, 2012

Chemistry
A scientist wants to make a solution of tribasic sodium phosphate, , for a laboratory experiment. How many grams of will be needed to produce 625 of a solution that has a concentration of ions of 0.800
October 13, 2011

AgBio1
Evidence shows that hippos and whales are closely related organisms. How might evolution and adaptation account for similarities and differences between them.?
September 5, 2011

Pre-Calc
How would I solve: X^(4/3)+X^(2/3)=28
June 23, 2011

Thermo engineering
torque=F*D/2=2000n(0.15m)=300 N*m Power = Torque*angular speed =(300 N*m)(300 RPM) (2*PI/60) =9424 W = 9.42 kW These are the answers in the back of the text.
May 10, 2011

geography
I have the same essay question. here's part of my notes...the eastern part of the Taklimakan desert receives less than 0.5 inches of rain per year...hope i helped!!
May 7, 2011

chemistry
What volume of 0.406 M KOH is required to completely react with 18.50 mL of 0.287 M H2SO4?
February 22, 2011

chemistry
What is the concentration of HCl in a 250.0 mL sample of hydrochloric acid if 15.5 mL of 0.0100 M NaOH is needed to react with all the HCl?
February 22, 2011

chemistry
Calculate the volkume of 0.750 M KNO3 that contains 17.0 grams of KNO3?
February 22, 2011

chemistry
How many grams of sodium hydroxide are required to prepare 500 mL of 0.500 M NaOH?
February 22, 2011

Physics
Compare the gravitational force on an 11 kg mass at the surface of the Earth (with radius 6.3 X 10^6 m and mass 6 X 10^24 kg) with that on the surface of the Moon (with mass 1/81.3 ME and radius 0.27 RE). What is the force on the Earth? What is the force on the moon?
February 20, 2011

Physics
Compare the gravitational force on an 11 kg mass at the surface of the Earth (with radius 6.3 X 10^6 m and mass 6 X 10^24 kg) with that on the surface of the Moon (with mass 1/81.3 ME and radius 0.27 RE). What is the force on the Earth? What is the force on the moon?
February 20, 2011

Physics
A roller-coaster car with a mass of 500 kg starts at rest from point A, which is 46 m above the ground. At point B, it is 23 m above the ground.
February 2, 2011

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