Friday

December 2, 2016
Total # Posts: 1,546

**algebra 2 help please**

D)x^2+y^2=625 X^2+(y-50)^2=1122 Y=20 (-15,20)(15,20) E)x^2+y^2=625 X^2+y^2-200y+10000=13618 Y=18 (-20,-15)(20,-15) 1)Combine your answers from Parts D and E to pinpoint the epicenter of the earthquake 2)Graph the equations for all three stations to verify your algebraic ...

*May 17, 2012*

**algebra 2**

An auditorium has a curved back wall. A horizontal cross section of the wall is in the shape of a parabola. The wall is 80 feet wide and the vertex of the parabolic cross section is 50 feet from the stage. Where in the auditorium should you sit for the best sound quality?

*May 14, 2012*

**algebra 2**

Nonlinear systems Solve the system by elimination. y=x^2+2 -4x-y=10 Solve the system using substitution. y=-3x^2+x-2 y=-5x+3

*May 9, 2012*

**algebra 2**

An auditorium has a curved back wall. A horizontal cross section of the wall is in the shape of a parabola. The wall is 80 feet wide and the vertex of the parabolic cross section is 50 feet from the stage. Where in the auditorium should you sit for the best sound quality? ...

*May 9, 2012*

**physics**

Two rigid rods are oriented parallel to each other and to the ground. The rods carry the same current in the same direction. The length of each rod is 0.85 m, and the mass of each is 0.077 kg. One rod is held in place above the ground, while the other floats beneath it at a ...

*May 8, 2012*

**algebra 2**

Nonlinear homework... Solve the system by elimination. 1)y=x^2+2 -4x-y=10 2) Solve the system using substitution. Y=-3x^2+x-2 Y=-5x+3

*May 7, 2012*

**algebra 2**

Solving nonlinear systems

*May 7, 2012*

**algebra 2**

Solve the system using substitution. Y=-3x^2+x-2, Y=-5x+3

*May 7, 2012*

**algebra 2**

Solve the system by elimination. Y=x^2+2, -4x-y=10

*May 7, 2012*

**physics**

A body projected upward from the level ground at an angle of 50º with the horizontal has an initial speed of 40 m/s. (a) How long will it take to hit the ground? (b) How far from the starting point will it strike? (c) At ehat angle with the horizontal will it strike?

*May 5, 2012*

**algebra **

Write an equation for a parabola with vertex at (3, -6) and focus at (3, -4)

*May 4, 2012*

**algebra**

Write the equation for a parabola with vertex ( -2, 3) and focus ( -2, 1

*May 4, 2012*

**Maths**

Oh dear me. What is this? My eyes are burning!

*May 3, 2012*

**calculus**

What size should be the frame be? Suppose an artist has a circular picture with a diameter 6 inches which she wishes to frame by a uniform width frame with covers 1/2 inch width uniformity of the painting and has total area equal to that of the exposed painted surface when the...

*May 1, 2012*

**Math**

How do you use prime factorization to reduce a fraction?

*April 26, 2012*

**Math**

Sorry, I didn't see yours

*April 26, 2012*

**Math**

How do you use prime factorization to reduce a fraction?

*April 26, 2012*

**Math**

how do you write the prime factorization for 75/108.

*April 25, 2012*

**Math**

If input x is 1, 2, 3, 4 and output y is 6, 10, 14, 18 , what is its function rule?

*April 23, 2012*

**Help**

Avery has a three week vacation. He plans on driving a total of 4,898 miles. About how many miles should he average per day? As it turned out he spent 5 hours a day driving and drove a total of 5,565 miles. What was his average speed for the hours he drove?

*April 23, 2012*

**Math**

It is known that if the deer population falls below a certain level, m, then the deer will become extinct. It is also known that is the deer population goes above the maximum carrying capacity, M, the population will decrease to M. (a) Discuss the reasonableness of the ...

*April 20, 2012*

**math**

A jar consists of 21 sweets, 12 are green and 9 are blue. William picked 2 sweets at random. Find the probability that both sweets are blue.

*April 19, 2012*

**math**

A jar consists of 21 sweets, 12 are green and 9 are blue. William picked 2 sweets at random. Find the probability that both sweets are blue.

*April 19, 2012*

**physics**

One gram of tungsten has 3.28 × 1021 atoms, and each tungsten atom has 74 electrons. How many electrons are contained in 9.00 g of tungsten? Answer in units of electrons

*April 19, 2012*

**physics**

Three point charges, +6.5 ¦ÌC, +1.4 ¦ÌC, and −3.9 ¦ÌC, lie along the x-axis at 0 cm, 1.8 cm, and 5.3 cm, respectively. What is the force exerted on q1 by the other two charges? (To the right is positive.) The Coulomb constant is ...

*April 19, 2012*

**physics**

Two electrostatic point charges of +54.0 ¦ÌC and +47.0 ¦ÌC exert a repulsive force on each other of 189 N. What is the distance between the two charges? The value of the Coulomb constant is 8.98755 ¡Á 109 N ¡¤ m2/C2. Answer...

*April 19, 2012*

**physics**

A small cork with an excess charge of +5.0 ¦ÌC is placed 0.14 m from another cork, which carries a charge of −3.2 ¦ÌC. What is the magnitude of the electric force between the corks? The Coulomb constant is 8.98755 ¡Á 109 N ¡...

*April 19, 2012*

**economics**

Companies are usually taken private by who?

*April 17, 2012*

**Grammar**

Proofreading.. PROCEDURE: The patient was prepped and draped in the usual sterile fashion. Examination of the vocal chords in a sitting position revealed a poly-poid growth in front of the left false vocal cord with erythematous base and yellow colored tip. Vocal cord appeared...

*April 17, 2012*

**Grammar**

Proofreading: This paragraph just sounds awkward to me to begin with. Carina was inspected at that time, which appeared sharp with no mucosal lesions noted. 2% Lidocaine was instilled over the carina. Right main stem bronchus was inspected next. Opening to the right upper lobe...

*April 17, 2012*

**grammar**

LOL I can't believe I missed father being capitalized. Thank you writeacher.

*April 17, 2012*

**grammar**

Editing grammar. Review of the sleep questionnaire indicates that the patient had a Trend Oximetry done 2 years ago, and was placed on 9 cm of sea pap. The patient notes that he has not seen much change with the use of it. His Father has a history of the same. He still ...

*April 17, 2012*

**RMS Speed**

Nvm, got it

*April 16, 2012*

**RMS Speed**

A gas is at 20°C. To what temperature must it be raised to triple the rms speed of its molecules? Ans: 2364oC I don't get how they got the answer. Please help!

*April 16, 2012*

**math**

Need help

*April 14, 2012*

**grammar**

1. If we can meet with the patient and he / him / himself, we can discuss possible alternative treatments. A) he B) him C) himself 2. An argument between her boyfriend and her / she resulted in the latest injury. A) her B) she 3. The patient’s son is taller than he / him...

*April 10, 2012*

**Calculus**

Which of the following is the x-intercept of the plane 2x-4z+1=0? a) P(2,0,-4) b) P(0,0,0) c) P(-1/2,0,0) d) P(0,0,1/4)

*April 9, 2012*

**Calculus**

Which of the following planes is the equation for the pane with an x-intercept at P(2,0,0), a y-intercept at Q(0,-3,0), and is parallel to the z-axis? a) 3x-2y-6=0 b) 2x-3y+z-6=0 c) 3y-2z-6=0 d) z=-6

*April 9, 2012*

**Calculus**

Which value of k will make the plane r=(k,3k,12) +s(2,2,3)+t(-1,1,3), s,teR passing through the origin? a) 2 b) 1 c)0 d) -1

*April 9, 2012*

**Calculus**

Explain the possible relationships between two lines in R^3

*April 9, 2012*

**Calculus**

I was thinking about that, ha~ but thought it would be wrong. Thanks!

*April 8, 2012*

**Calculus**

Determine two sets of parametric equations for the line passing through the points P(1,7,1) and Q(3,4,4) ---------------------------------------- I got one of them but I don't know how to get a second parametric equation. first one: x=1-2s, y=7+3s, z=1-3s second:???

*April 8, 2012*

**geometry**

1. 5/3 2.25/9 :D ^_^

*April 8, 2012*

**Calculus**

Explain why the plane with Cartesian equation 2x+5z-3=0 never intersects the y-axis. Answer:Because there is no y-value in the equation?

*April 8, 2012*

**Calculus**

Verify please and thank you~ Does the line (x-7)/3=(y+8)/6=(z+4)/5 and the point P(10,-2,1) determine a plane? Answer: Yes, it is a plane because when I substituted the point P(10,-2,1) into the equation, I got the coordinates (1,1,1) If the coordinate became to be (0,0,0) ...

*April 8, 2012*

**Calculus**

Determine the value of k that makes the line (x+2)/4=(y+1)/5=(z-3)/3 and r=(1,3,6 +s(-2k,2,k), SeR, perpendicular.

*April 8, 2012*

**Chemistry**

A mixture contains 5.0 g of He, 1.0 g of Ar, and 3.5 g of Ne. Calculate the volume of this mixture at STP. Calculate the partial pressure of each gas in the mixture at STP.

*March 28, 2012*

**buckley**

x-intercept -4:y - intercept -2 write an equation in slope - intercept form

*March 27, 2012*

**Grammar**

1. Select the sentence which is correctly punctuated: A) The patient was seen by Dr. Jones cardiology specialist Dr. Smith rheumatology specialist and Dr. Brown urology specialist. B) The patient was seen by Dr. Jones, cardiology specialist; Dr. Smith, rheumatology specialist...

*March 19, 2012*

**Grammar**

Thank you Ms. Sue!

*March 19, 2012*

**Grammar**

Need a little bit of help here. 1. Select the correct verb form: A) The box of medical books was heavy. B) The box of medical books were heavy. 2. _____are going to dinner together. A) Me and my boss B) My boss and I 3. Select the sentence which is correctly punctuated: A) The...

*March 19, 2012*

**Math**

Express in exponential form: -3log5(z)-x^2=2x+1

*March 16, 2012*

**Math**

Express in logarithmic form: y=27(1/3)^2x

*March 16, 2012*

**chemistry**

how to change mg/mL into mmol/L?

*March 14, 2012*

**MATH **

6:10 closer to the 6'o clock and why?

*March 14, 2012*

**chemistry**

THANKS

*March 12, 2012*

**chemistry**

DrBob22 PLEASE hELP!!!!!!!!!!!!!!!!!

*March 12, 2012*

**chemistry**

The urine excreted by an adult patient over 24 hours was collected and diluted to give 2.000L sample. at ph 10 EDTA FORMS 1:1 COMPLEX WITH BOTH Mg2+ and Ca2+ and after buffering at this pH a 10mL aliquot of the sample required 26.81mL of 0.003474M EDTA for titration The ...

*March 12, 2012*

**Chemistry**

[H2O]=1M

*March 9, 2012*

**trig**

find the general solutions to the equations: 1) sec x = -2 2) 2 sin^2 x = 1 3) cos^2 x - 2cos x + 1 = 0

*March 5, 2012*

**Chemistry**

I was wondering if anyone could describe a general Friedel-Crafts alkylation to me. I understand that it involves the substitution of an aromatic ring with an alkyl group using a strong Lewis acid catalyst. But, what types of activating groups are present on the ring? What'...

*March 1, 2012*

**Math- Exponent Laws.**

Simplify, "put the power into a single positive exponent." -(-2)^0*(-2)^3*(-2)^-4/(-2)^3 please help I am so lost on how to solve this problem!! I have been trying to figure it out for days. the - in front of the (-2) is very confusing.

*February 29, 2012*

**Science**

Where the animal first starts to deposit fat?

*February 27, 2012*

**Chemistry**

An aqueous salt solution is formed by adding 11.67 g sodium sulfate (solute) to water (solvent). What mass (in g) of water is used if the freezing point of the solution is -12.9 Farenheit. Kf H2O = 1.86 Celsius/m

*February 24, 2012*

**chemistry**

For the reaction, A ¨ B, ƒ¢H‹ = +11.00 kJ mol-1 and Keq is 12.50 Calculate i) ƒ¢G‹ and ii) ƒ¢S‹ at 25 ‹C. [0 ‹C = 273.15 K; R = 8.314 J K-1 mol-1]

*February 21, 2012*

**physics**

For the reaction, A ¨ B, ƒ¢H‹ = +11.00 kJ mol-1 and Keq is 12.50 Calculate i) ƒ¢G‹ and ii) ƒ¢S‹ at 25 ‹C. [0 ‹C = 273.15 K; R = 8.314 J K-1 mol-1]

*February 21, 2012*

**physics**

can someone please explain f1d1 = f2d2

*February 21, 2012*

**Physics**

Two electrons exert a force of repulsion of 0.96 N on each other. How far apart are they? The elemental charge is 1.602 × 10 −19 C .

*February 17, 2012*

**chemistry**

i just had sex and it felt so good.

*February 17, 2012*

**chemistry**

I don't have answers could u still try to help me

*February 16, 2012*

**chemistry**

Q1) For the reaction, A to B, Delta H= +11.00 kJ mol-1 and Keq is 12.50 Calculate i) delta G and ii) delta S at 25 C (degrees celcius) 0 C degrees celcius = 273.15 K; R = 8.314 J K-1 mol-1] PLease help dr bob222

*February 16, 2012*

**chemistry**

Q1) For the reaction, A to B, Delta H= +11.00 kJ mol-1 and Keq is 12.50 Calculate i) delta G and ii) delta S at 25 C (degrees celcius) 0 C degrees celcius = 273.15 K; R = 8.314 J K-1 mol-1]

*February 15, 2012*

**chemistry**

Q1) For the reaction, A ¨ B, ƒ¢H‹ = +11.00 kJ mol-1 and Keq is 12.50 Calculate i) ƒ¢G‹ and ii) ƒ¢S‹ at 25 ‹C. [0 ‹C = 273.15 K; R = 8.314 J K-1 mol-1]

*February 15, 2012*

**grammar**

Hyphens are so confusing, so I'm asking for a little help. 2. Select the sentence which is correctly punctuated. A) He came in for his follow up. B) He came in for his followup. My answer: B 4. Select the sentence which is correctly punctuated. A) He will follow-up in 4 ...

*February 14, 2012*

**chemistry**

Q1) For the reaction, A ¨ B, ƒ¢H‹ = +11.00 kJ mol-1 and Keq is 12.50 Calculate i) ƒ¢G‹ and ii) ƒ¢S‹ at 25 ‹C. [0 ‹C = 273.15 K; R = 8.314 J K-1 mol-1]

*February 14, 2012*

**Chemistry **

Is there any way to increase the ionic strength of a solution without increasing the pH?

*February 12, 2012*

**Tourism**

why is it important that the sport industry and the tourism industry have a good relationship? And what is the relationship between them?

*February 10, 2012*

**Physics **

An enemy ship is on the western side of a mountain island. The enemy ship can maneuver to within 2520 m of the 1850 m high mountain peak and can shoot projectiles with an initial speed of 260 m/s. If the eastern shoreline is horizontally 305 m from the peak, what is the ...

*February 5, 2012*

**Math**

a bracelet is to be made from 2 red and 5 blue beads. how many different bracelets can be made

*January 29, 2012*

**Math**

The number of library books in a school increased by 20% after it bought new books in may. The number increased by another 20% after a bookstore donated 300 books in June. Find the number of books in the library before it bought new books in May.

*January 26, 2012*

**Punctuation & Grammar**

She is a pleasant 18-year-old female who states that she was at a pub where she was eating and actually fell while holding a tray and rolled her ankle. A) complete sentence B) fragment C) run-on My first thought is C) run-on, but I always second guess myself. Now I think it ...

*January 25, 2012*

**Stat**

a large no. of bonobos were found to be normally distributed with a mean of 46 and a variance equal to 9. if each of their scored is increased by 5 points, what percentage of the new scores is less than 50?

*January 17, 2012*

**physics**

A 1.80 m radius playground merry-go-round has a mass of 120 kg and is rotating with an angular velocity of 0.350 rev/s. What is its angular velocity after a 28.0 kg child gets onto it by grabbing its outer edge? The child is initially at rest.

*January 16, 2012*

**Math (algebra)**

86

*January 11, 2012*

**physics**

need help can someone please tell me Electricity is often converted into other forms of energy. List 3 examples.

*January 5, 2012*

**7th physics**

baloonist drops rock from balloon. takes 7 seconds for the rock to fall. what's the balloonist's altitude in feet?

*January 5, 2012*

**Math**

Tomas put $180 in an account earning simple interest. At the end of one year, the account had $186.30 in it. Assuming no additional deposits or withdrawals, what was the interest rate being paid? I really need help!

*January 3, 2012*

**math**

That is easy. Now put 0.75 in a fraction and redouce it: 75/100= 3/4 Than 0.2: 2/10= 1/5 8/10= 4/5 Now they are all fractions. so it should be this: 3/4,1/5,4/5.

*January 3, 2012*

**chemistry**

b. Methanol, CH3OH, which can be used as a fuel, can be formed by the reaction between carbon monoxide and hydrogen as depicted in the following balanced equation. 2H2 + CO ¨ CH3OH Suppose 356 g of CO and 65 g of H2 are mixed and allowed to react. (i) Which species ...

*December 28, 2011*

**physics**

thanks alot :D i got 3s for t for part 2!! nd i got 17.1s for part1 is dat correct??

*December 22, 2011*

**physics**

Driving in a car with a constant velocity of 11.4 m/s you suddenly see an obstacle ahead. Immediately applying the brakes the car slows with an acceleration of 3.80 m/s2. (i) Calculate the stopping distance of the car, and (ii) the time taken to stop.

*December 22, 2011*

**chemistry**

n=m divided by mr n=25 divided by mr of nacl 23+35.5 n=c*v

*December 13, 2011*

**chemistry**

can you find them for me

*December 13, 2011*

**chemistry**

yeas it is a mean mass ratio could you show me how to do it Bob Pursley

*December 13, 2011*

**chemistry**

Compound C (MW = 550) is provided at a concentration of 25g/100mL. 1mL is taken and compound D is to be added (MW = 1025, concentration = 75mM) to give a final ratio of compound C:D of 4:1 . What volume of compound D is to be added? ''DR BOB 222 IT IS A GRAMS RATIO'...

*December 13, 2011*

**chemistry**

The ratio of 4:1 by moles DrBob222

*December 8, 2011*

**chemistry**

moles please show me the steps on how to do it thanks

*December 8, 2011*

**chemistry**

please help

*December 8, 2011*

**chemistry**

6. Compound C (MW = 550) is provided at a concentration of 25g/100mL. 1mL is taken and compound D is to be added (MW = 1025, concentration = 75mM) to give a final ratio of compound C:D of 4:1. What volume of compound D is to be added?

*December 8, 2011*

**chemistry **

5. Compound A has a MW of 283. 0.423g of Compound A is dissolved in 13.5mL of water and 1mL of the solution added to 5mL of water to produce “solution A”. What is the concentration of Compound A in “solution A”?

*December 8, 2011*