Thursday

March 26, 2015

March 26, 2015

Total # Posts: 132

**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**

Can you please help me solve r1/r2 = sqrt(M2/M1)for M1. My answer: M1=M2r2^2/r1^2 Is this correct?
*January 28, 2015*

**Science-Chemistry**

Thank you very much DrBob222
*January 28, 2015*

**Science-Chemistry**

Can you please help me solve r1/r2 = sqrt(M2/M1)for M1. My answer: M1=M2r2^2/r1^2 Is this correct?
*January 28, 2015*

**Chemistry**

Can you please help me solve r1/r2 = sqrt(M2/M1)for M1. My answer: M1=M2r2^2/r1^2 Is this correct?
*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 dont know if thats right...
*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*

**social (fifth grade)**

on the internet
*November 7, 2014*

**math**

hgjkjhghkzfyghfuykjycvfhkvlyvkjhzytvlyzvzgvjkhczgt chzjhkvgzvyhjbvchvmxgv,zvymhuizyvtyv8zthfuytyfyvyvtdzvhiuzvuyvdy;uyytttgytty
*October 18, 2014*

**Chemistry**

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

**Math**

fun
*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 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*

**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**

help please lol.
*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**

The answer is C
*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*

**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*

**Friendship(Shakespeare)**

Thanks a ton for the sites Writeacher:)
*January 24, 2011*

**Friendship(Shakespeare)**

Friendship can break the inner you, form the newer you and turn you into someone whom you've never imagined to become. From arrogant, it can turn you to someone compassionate, and can change someone from generous to discourteous.
*January 24, 2011*

**Friendship(Shakespeare)**

Frienship is what one seeks for when they are forlorn.
*January 24, 2011*

**Friendship(Shakespeare)**

Friendship is not expressed from the mind, but the heart. It is an abounding relation which one could ever sense. Do you know of any Shakespearean translator online?
*January 24, 2011*

**Friendship(Shakespeare)**

Is there a shakespearean translator online?
*January 24, 2011*

**Friendship(Shakespeare)**

I'm trying to write a few sentences about what I believe friendship is. I really love Shakespeare's literature, and want to write the sentences like his. Friendship sy ne expressed fram the mind, but the soul. It is se abounding consanguinity which one could ever sense.
*January 24, 2011*

**Chemistry-Help Dr. Bob222**

Would that still equal a pH of 3.1?
*December 14, 2010*

**Chemistry-Help Dr. Bob222**

The problem was 6.4 x 10^-6. Thanks
*December 14, 2010*

**Chemistry-Help Dr. Bob222**

The equation I'm trying to use looks like this: 1.0 x 10^-14 divided by 6.4 x 10^-6 which gives me a solution of 1.5625 x 10^-9 which can't be right!
*December 14, 2010*

**Chemistry-Help Dr. Bob222**

Thanks, totally still confused. I don't know how to solve for (x) since I don't know what the acid is?
*December 14, 2010*

**Chemistry-Help Dr. Bob222**

If a weak acid has a dissociation constant of 6.4 x 10^-6, what is the pH of a solution of this acid in a 0.10 molar concentration? I still don't understand the equation you gave me. My textbook doesn't break it down like this, so I'm confused as to where to plug ...
*December 14, 2010*

**Chemistry-pH problem**

If a weak acid has a dissociation constant of 6.4 x 10(-6), what is the pH of a solution of this acid in 0.10 molar concentration?
*December 13, 2010*

**Chemistry-Confused by titration!!**

If a 28 mLs of a 0.25 molar NaOH solution is used to titrate 14 mLs of a nitric acid to its phenolphthalein endpoint, what is the molar concentration of the acid?
*December 13, 2010*

**Math**

Can 252/1663 be simplified? If it can be simplified, what is the new simplified fraction?
*November 22, 2010*

**math 11**

Please help this question is from my unit on linear programing and I'm having trouble completing it. A company manufactures bicycles and tricycles. The total number of frames the company manufactures cannot exceed 80 per month. It takes the company 1 hour to assemble a ...
*November 16, 2010*

**math (linear programing problem)**

Please help this question is from my unit on linear programing and I'm having trouble completing it. A company manufactures bicycles and tricycles. The total number of frames the company manufactures cannot exceed 80 per month. It takes the company 1 hour to assemble a ...
*November 16, 2010*

**AP Physics**

Jean, who likes physics experiments, dangles her watch from a thin piece of string while the jetliner she is in takes off from Dulles Airport (Fig. 4-55). She notices that the string makes an angle of 24° with respect to the vertical while the aircraft accelerates for ...
*November 14, 2010*

**AP Physics**

An 18.0 kg box is released on a 35.0° incline and accelerates down the incline at 0.269 m/s2. Find the friction force impeding its motion. How large is the coefficient of friction?
*November 14, 2010*

**6th grade**

They are all on at different times. None retelevised
*November 4, 2010*

**6th grade**

There are 3 parades on Cable Tv in the morning, 2 in the afternoon and 4 at night. How Many different combinations of parades can Ty watch?
*November 4, 2010*

**math**

your welcome
*November 3, 2010*

**math**

3/16=x/96 96(3)=16x 288=16x 288/16=16x/16 x=18
*November 3, 2010*

**Math**

-5+r=2r+3 what does r equal
*November 2, 2010*

**physics**

A daredevil leaves the end of a ramp with a speed of 32.0 m/s if his speed is 29.8 m/s when he reaches the peak of the path, what is the maximum height that he reaches? how do i do thiss?
*October 23, 2010*

**physics**

A daredevil leaves the end of a ramp with a speed of 32.0 m/s if his speed is 29.8 m/s when he reaches the peak of the path, what is the maximum height that he reaches? how do i do thiss?
*October 23, 2010*

**physics**

Find the height from which you would have to drop a ball so that it would have a speed of 6.4 m/s just before it hits the ground.
*October 23, 2010*

**math11**

I have several questions similar to this one and was wondering if you could walk me through this one. I'm totally lost on how to do it. Paramecia reproduce by splitting in two. In a laboratory flask, a colony of paramecia had an initial population of 500. Each day, the ...
*October 19, 2010*

**physics**

One of the fastest recorded pitches in major-league baseball, thrown by Billy Wagner in 2003, was clocked at 101.0 mi/h. If a pitch were thrown horizontally with this velocity, how far would the ball fall vertically by the time it reached home plate, 60.5 ft away? how do i do ...
*September 30, 2010*

**Physics**

HOW DO I DO THIS? A daredevil is shot out of a cannon at 45.0° to the horizontal with an initial speed of 28.0 m/s. A net is positioned a horizontal distance of 51.0 m from the cannon. At what height above the cannon should the net be placed in order to catch the daredevil?
*September 30, 2010*

**Math**

Teaneck High had an enrollment of 11040 in 1985 and an enrollment of 12100 in year 1998. What is the predicted enrollment of Teaneck High in 2014 if we assume a linear model?
*September 24, 2010*

**Math (Algebra Grade 8)**

x=-6
*September 21, 2010*

**Biology (muscle response)**

Suppose you are asleep and the doorbell rings. You stumble to your feet and move toward the door, open it and speek with your visitor. Think of the many changes occurring in your body as you awaken and respond. How does the three types of muscle tissue help? I'm having ...
*August 14, 2010*

**Geometry**

I;m so lost with these questiona. Any help will be appreciated. 1. Find the area of a square if one side measures 27 centimeters. 2. Exactly how many cubic inches of air can a fully inflated basketball hold if its radius is 4.2 inches? Use Pi 3. How many cubic centimeters can ...
*July 21, 2010*

**Physics**

Find the height from which you would have to drop a ball so that it would have a speed of 6.4 m/s just before it hits the ground.
*July 1, 2010*

**Physics**

A hypothesis says the upper limit in frequency a human ear can hear can be determined by the diameter of the eardrum, which should have approximately the same diameter as the wavelength at the upper limit. Using the hypothesis what would be the radius of the eardrumfor a ...
*February 21, 2010*

**Pre-Calc (Follow-up with Bob Pursley)**

For the below problem, I solved it as you suggested and got k=.0486 When I did 300,000 = 122,000e^.0486t I got about 18.5 years for when the sewer system would need to be updated. Next, for how many people will the new system have to accommodate for the system to last 15 years...
*January 10, 2010*