Thursday
November 27, 2014

Posts by jenny


Total # Posts: 1,243

algebra 2
Ralph, Mario, Jack, Laura, and Maria are in the math club. The club advisor will assign students to 3-person teams at the next math team competition. How many different 3-person teams can be formed from these five students? I got this wrong...here was my answer 5*4*3/(2*1) 60/...
May 19, 2012

algebra 2 homework check
Thank you. Boy I was way off!!! I guess I over think things.
May 19, 2012

algebra 2 homework check
Tell whether the possibilities should be counted using a permutation or combination. Then find the number of possibilities. You have a carrying case that holds four CDs. You want to know in how many ways you can place four of the ten CDs you own into the case. Answer: 10*9*8*7...
May 19, 2012

algebra 2
Yves and some friends are playing a fair game in which 18 cards are dealt to 6 players. One of the cards is a queen. The player who receives the queen goes first. What is the probability that Yves will go first?
May 19, 2012

algebra 2
Thank you
May 19, 2012

algebra 2
If no digit appears more than once, how many 2-digit numbers can be formed from the digits 1, 3, 5, and 7?
May 19, 2012

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

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

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

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

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