1. college algebra--please help

    what does Descartes rule of signs tell you about the possible number of positive real number zeros and the possible number of negative real zeros of the function? 1. f(x)=2x^5-5x^2+x-1 2. f(x)=5x^6+7x^4-x-6 please show work

    asked by ladybug on November 19, 2012
  2. Math

    5 books and 9 magazines cost $150.50 dollars altogether. 9 Books and 5 magazines cost $175.70. How much does 1 book and 1 magazine cost? Please show work

    asked by Nomad on March 19, 2013
  3. math help

    suppose a triangle has an area of 10ft^2. IF the base of the triangle is 1 foot longer than the height of the triangle, what are the lenghts of the base and height? Please help and show work

    asked by carol on October 18, 2016
  4. Physics

    A block with a mass of 2.5 kg on a frictionless track collides and sticks to a stationary block with a mass of 1.75 kg and the two more together at a velocity of 3.5 m/s. What was the velocity of the first block? A. 2.5 m/s B. 7.5 m/s C. 6.0 m/s D. 0.6 m/s

    asked by john on December 3, 2012
  5. physics

    A 25.0 g silver spoon at 20.0 C is placed in a cup of coffee initially at 90 C. How much heat does the spoon absorb from the coffee as the spoon warms up to 89 C? (C Silver - 230 J/kg C) Show all work.

    asked by wazir on March 20, 2015
  6. Physics

    calculate the acceleration of this system, assuming that there are no frictional forces between the table and Block A. Block A is sitting on a table connected by a rope to a pulley system and Block B is hanging off the table connected to the rope from the

    asked by JR on November 19, 2013
  7. science(chem)

    Hi =) I have two Q's 1. What are the 2 purposes of using a caffine standard during the HPLC process? In general not talking about HPLC I would think a standard is for a)comparing to your own results to see how good your results came out. b) seeing if you

    asked by ~christina~ on February 2, 2008
  8. Differential Equations

    I don't understand how to solve this. I can solve the left side and get yc, but I have no idea how to solve for the right side. y''-3y'+2y=(e^2t)/(e^t+1)

    asked by Anonymous on March 22, 2018
  9. Chemistry

    What is the concentration of a solution of lithium carbonate containing 0.01 mol in 750 mL of solution What volume of 0.01 mol L-1 Li2CO3 solution would contain 0.035 mol lithium carbonate? Give your answer as 2 sig fig (this is technically not correct),

    asked by Preity Zinta on June 13, 2012
  10. Chemistry

    Calculate the initial molarity of KNH2 and the molarities of K+, NH3, OH-, and H3O+ in an aqueous solution that contains 0.75 g of KNH2 in 0.255 L of solution. You may ignore the reaction of NH3 with water. I already found the initial molarity, but I am

    asked by Trixie on February 23, 2010
  11. Math (Pease Help! 2 questions!)

    A bag contains 2 white marbles and 7 purple marbles. Two marbles are drawn at random. One marble is drawn and not replaced. Then a second marble is drawn. c) What is the probability of selecting a purple marble and then a white marble? c) What is the

    asked by Anonymous on January 28, 2016
  12. Engineering

    Your Swine manure pit is rectangular measuring 50' by 100' and is 4' deep. If you use a 1" diameter hose 2 hours each day at 8 ft per second velocity to remove the manure from your swine pins how many days worth of storage space do you have in your pit? In

    asked by matt on September 10, 2006
  13. Chemistry

    In a similar experiment, a sample of tin metal was dissolved in nitric acid to produce 23.00 mL of solution containing Sn2+. Titration analysis resulted in the calculation that the concentration of Sn2+ in this solution was 0.65 mol/L. b. What mass of tin

    asked by james on November 5, 2016
  14. Chemistry

    The output of a diesel generator, which contains a mixture of CO2 and H2O gases, is collected in a sealed vessel at 447 K. As the mixture cools to 298 K, the pressure falls from 3.0 atm to 0.80 atm. What is the ratio of CO2 to H2O in the mixture? Have you

    asked by Vic on July 22, 2007
  15. math word problem

    Susan uses 15 rolls of ribbon to decorate 10 wedding baskets. Each roll of ribbon is 5 3/8 yards long. After she decorates the baskets, she decides to cut off another 3/4 yard from the ribbon of each basket. Write and simplify an expression to fin out how

    asked by thomas on April 7, 2014
  16. financial health science

    ABC Health Med, has a $1,000 par value bond with an 8 percent rate outstanding. The bond has 12 years remaining to it maturity date. If interest is paid semiannual interest, what is the value of the bond when the required return is 8 percent. Show all

    asked by frances on December 17, 2010
  17. math word problem PLEASE HELP

    Susan uses 15 rolls of ribbon to decorate 10 wedding baskets. Each roll of ribbon is 5 3/8 yards long. After she decorates the baskets, she decides to cut off another 3/4 yard from the ribbon of each basket. Write and simplify an expression to fin out how

    asked by thomas on April 7, 2014
  18. math

    Please show work The little town arts center charges $21 for adults, $17 for senior citizens and $8 for children under 12 for their lfe performance on sunday. On sunday the revenue paid wa $13,274 for 886 tickets sold. There were 47 more children than

    asked by ReRe on February 5, 2010
  19. math

    The 6th grade classes have started a contest to collect cans for recycling. The first class to reach 500 cans will win. The chart below shows the two classes in the lead. How many cans does each class have left to meet their goal? show the work .

    asked by sai on March 24, 2014
  20. Math word problems

    Susan uses 15 rolls of ribbon to decorate 10 wedding baskets. Each roll of ribbon is 5 3/8 yards long. After she decorates the baskets, she decides to cut off another 3/4 yard from the ribbon of each basket. Write and simplify an expression to fin out how

    asked by thomas on April 7, 2014
  21. physics

    A harmonic wave is traveling along a rope. The oscillator that generates the wave completes 40.0 vibrations in 30.0 s. A given crest of the wave travels 425 cm along the rope in a period of 10.0 s.What is the wavelength? Show all of your work plz. i know

    asked by Anonymous on May 11, 2011
  22. math

    the numerator of a fraction is 3 less than the denominator. if 4 us added to the numerator and to the denominator, the resulting fraction is equivalent to 3/4. find the original fraction. Show your solution

    asked by mm on September 23, 2016
  23. Physics

    Suppose we had a straight tunnel, through Earth's center, to a point on the opposite side of the planet, and used it to deliver mail to the other side. With what speed would our packages pass through Earth's center. So: ag = (GM)/R2 Mins = (4/3)πR3*ρ So,

    asked by Nora on April 4, 2015
  24. English

    I need help fixing up this essay so that it flows betters. Here are the directions the teacher gave. Assignment: Compose a brief essay which specifically develops topic including a clear and relevant topic sentence. Provide at least one specific example

    asked by keisha on October 10, 2010
  25. Chemistry

    a solution is prepared by dissolving 3.7500grams iron(III) oxalate in enough water to make 125.00mL of solution. 1. what is the molar concentration of iron(III) oxalate in this solution? 2. what is the molar concentration of oxalate ions in this solution?

    asked by Anonymous on April 1, 2014
  26. Computer Science

    Which of the following statements contains an error? 1. system.out.print("/tab Age in Minutes: " + ageInMinutes +"/n"); 2. system.out.print("t/ Age in Minutes: " + ageInMinutes + "n/"); 3. system.out.print("/t Age in Minutes: " + ageInMinutes + "/n"); a. 1

    asked by help please on October 23, 2017
  27. organic chem

    Predict the major substitution and elimination products for butane with a Ph atom and a I atom on the 2nd carbon when added with methanol and heat. iupac name of the structure if it had carbon atoms I think is 2 dimethyl butane

    asked by Alex on October 19, 2015
  28. geometry

    this is my last one, in triangle ABC, mesurment of angle CAB is equal to 60 degrees and point D belongs to the line BC and AD is equal to 8 ft. Find the distances from D to the sides of the triangle. honestly i have absolutly no ideaon to how tosolve this

    asked by Ashley on September 13, 2017
  29. Physics

    Please Help ! A child throws a snowball at a tree and it sticks to the tree. Does this motion defy the Law of Conservation of Momentum? Explain. The Law of Conservation of Energy states: "If there is no net force acting on a system of objects, the total

    asked by Rachel on November 9, 2009
  30. Chemistry

    EQUILIBRIUM: Given the equation 2 PbS(s) + 3 O2(g) 2 PbO(s) + 2 SO2(g) What direction will the reaction proceed if additional SO2 was added to the system at equilibrium? Forward Reverse Nothing Happens Difficult to determine You really need to do this

    asked by Joe on January 31, 2007
  31. chemistry

    Chromium (III) iodate has a Ksp at 25°C of 5.0 x 10–6. 125 mL of a solution contains 0.0050 mol L–1 Cr (III) ion. When 75.0 mL of the NaIO3 solution have been added, what is the concentration of the Cr(III) ion remaining in solution? not sure how

    asked by James on June 9, 2016
  32. chemistry

    An aqueous solution of nitric acid is standardized by titration with a 0.121 M solution of calcium hydroxide. If 24.5 mL of base are required to neutralize 15.4 mL of the acid, what is the molarity of the nitric acid solution?

    asked by arch on October 9, 2014
  33. chemistry

    If 15.0 mL of a 1.5M HCl solution at 22.5 degrees C is mixed with 25.0mL of a 1.5M NaOH solution at 21.5 degrees C that is in a calorimeter, and the final mixed solution temperature ends up at 28.5 degrees C, what is the balanced equation for this

    asked by Tori on March 26, 2012
  34. Chem

    A 10.0% by mass H2SO4(aq) solution has a density of 1.07 g·cm-3. How many milliliters of solution contain 8.34 g of H2SO4? What mass (in grams) of H2SO4 is in 248 mL of solution? It's been a while since I have had a chem class...so sorry if this seems

    asked by Cairy on February 15, 2010
  35. Chemistry URGENT PLEASE PLEASE PLEASE HELP!

    Determine whether the solution is basic, acidic, or neutral. Write net ionic equations to show how it behaves in aqueous solutions. 1) Fe2(SO4)3 I know it is acidic Do I do hydrolysis equations for the net ionic or do I do redox reactions?

    asked by Anonymous on November 5, 2015
  36. physics

    A 17 kg block is dragged over a rough, hor- izontal surface by a constant force of 170 N acting at an angle of angle 32.1◦ above the horizontal. The block is displaced 33.9 m, and the coefficient of kinetic friction is 0.199. a] find the work done by

    asked by mary on November 14, 2010
  37. Science (Chemistry

    Use the experimental data below to determine the order of the reaction with respect to [Cr(NH3)5Cl]^2+(aq)+OH^-(aq)-->[Cr(NH3)5(OH)]^2+(aq) +Cl^-(aq) You must show your work for any calculations and/or sketch or include a printed graph showing how the

    asked by Asley on October 11, 2011
  38. Chemistry

    Which solution will have the lowest freezing point? 0.25 molal aqueous solution of sucrose 0.5 molal aqueous solution of glucose solution of 180 g of glucose (MW = 180.2 g/mol) in one kg of water. pure water

    asked by amanda on June 11, 2010
  39. Math

    Directions:Write inequalities for the numbers 2 - 4 below. Do not solve them! Problems: 2.Your quiz grades are 19, 17, 20, and 15. What is the lowest grade you can receive on the next quiz and maintain at least an 18 average? 3.Stacey and Luis volunteer at

    asked by Erica on June 21, 2007
  40. Physics

    A bungee jumper of mass 60 kg jumps from a bridge tied to an elastic rope which becomes taut after he falls 10 m. Consider the jumper when he has fallen another 10 m and is travelling at 15 m/s. Work out how much energy is stored in the rope. Take g=10

    asked by anon on December 17, 2010
  41. Maths

    The population of a colony of frogs under ideal condition double every 10 days. Solve the the equation 2 raised to the power of n equals 50 (2^n =50)to work out how many 10 days period it takes for the population to be 50 times as large as it is now.

    asked by Tom on April 29, 2016
  42. Math

    1. solve the equation. -9v - 5 = -95 A. 17 B. 11 C. 10 ** D. -10 2. Solve the equation. X/4 - 5 = -8 A. -27 B. -12 ** C. -7 D. 12 3. Solve the equation. d/3 + 10 = 7 A. 51 B. 20 ** C. 0 D. -9 4. Solve the equation. 2(2 - 2k) = -3k A. -4 B. 4 C. 6 D. 0 **

    asked by Anonymous on December 18, 2018
  43. chemistry

    Given the equilibrium system PCL5(g) PCl3(g) + Cl2(g) K = 12.5 at 60 degrees celsius. A 1.0 L reaction vessel is analyzed and found to contain 3.2 mol Cl2(g), 1.5 mol PCl3(g) and 2.0 mol PCl5(g). Show that the reaction mixture has not yet reached

    asked by ChemMaster98 on March 31, 2008
  44. chemistry

    Given the equilibrium system PCl5(g) PCl3(g) + Cl2(g) K = 12.5 at 60 degrees Celsius. A 1.0-L reaction vessel is analyzed and found to contain 3.2 mol Cl2(g), 1.5 mol PCL3(g) and 3.0 mol PCl5(g). Show that the reaction mixture has not yet reached

    asked by Walter on April 8, 2008
  45. IMPROVING WRITING

    I have noticed that in the past three months, a month after Jessica Hilo’s medical leave, there have been problems concerning Ruth and Jack’s workload. To begin with, Jessica’s duties have been temporarily reassigned to Frank and Ralph. Furthermore,

    asked by Jacqueline on December 10, 2014
  46. technology

    What is one of the strengths of line graphs? a) Line graphs show percentage in a whole b) Line graphs show change over time c) Line graphs compare values of individual groups or categories. d) Line graphs always show averages My answer is C

    asked by StarWars The Force Awakens I Love Star Wars Legos on November 7, 2017
  47. algerbra

    who invented algerbra and why is it important I searched on the internet and found notations as far back as 1850 BC (that's a long time ago) by a plethora of nations (Egypt, India, and others). Your next question is easier to answer. MOST of the work

    asked by helen on September 19, 2006
  48. Engineering maintenance

    an undamped mass spring system is with mass of 12kg and stiffness of 15N/mm,a)determine the natural frequency and the period of the free motion of the system b)determine the amplitude of displacement A and the phse shift for the initial conditions

    asked by anu on October 29, 2012
  49. medical info mangement

    please help me is a web-site that may help thanks Harper Clinic's filling system generates a gap in the filing space when medical records are moved forward to the most recent assiged medical record number. Which type of the numbering filing system does

    asked by alex on April 4, 2008
  50. chemistry

    An electrical heater delivers 4.070 kJ of energy (as heat) to a system consisting of the gas inside a cylinder having a movable piston. As a result, the piston moves against a constant external pressure such that P ∆V = 2.442 kJ. What is the change in

    asked by korko on September 26, 2014
  51. Trigg

    How do I find a rectangular-coordinate equation for the curve by elimination the parameter? x=2 sin t, y= 4 cos t so far I have x= r cos(theta) and y= r sin (theta) but, it's the opposite. please help.

    asked by Jenny on March 17, 2014
  52. Math (Algebra)

    Solve using the multiplication principle -7x

    asked by Lola on September 24, 2009
  53. Chemistry

    Redox titrations are used to determine the amounts of oxidizing and reducing agents in solution. For example, a solution of hydrogen peroxide,H2O2, can be titrated against a solution of potassium permanganate, KMnO4. The following equation represents the

    asked by Ellen on October 3, 2010
  54. Precalculus

    Explain how to do these please. 1. solve x=log(base2)*1/8 by rewriting in exponential form. 2. Solve log(3x+1)=5 3. Solve log(base x)8=-1/2

    asked by Melinda on January 29, 2012
  55. Chemistry

    Robin the Research scientist prepares 100 mLs of a solution of 100 mM of Tris HCl. What is the pH? and part two for this question Calculate the pH when the scientist adds 100 ul of 50% NaOH I am confused since we do not know the conjugate base

    asked by Aarya Singh on January 31, 2017
  56. Algebra

    Solving Linear Equations and Inequalities Solve by eliminating x (this is solving 3 linear equations) then substitute to the other two equation x + y + 5z =2 (1) 4x - 3y + 5z =3 (2) 3x - 2y + 5z=1 (3) my teacher gave me the answer she said the solution set

    asked by Clyde on April 25, 2016
  57. math

    find all solution to the equation 3 cos(x+4)=1. in the interval of 0

    asked by alicia otto on March 26, 2016
  58. Chemistry

    find the ph of 0.100M NaC2H3O2 solution. do i just write an equation and solve for x NaC2H3O2 +H2O= Na2O + HC2H3O2- 0.100 0 0 so x^2/0.100-x =1.8 X10^-5 x=1.3X10^-3 then do ph=-log(1.3X10-3) ph=2.9 is this right?

    asked by L.Bianchessi on March 6, 2012
  59. Algebra I DONT KNOW HOW TO DO 3 VARIABLES

    Solving Linear Equations and Inequalities Solve by eliminating x (this is solving 3 linear equations) then substitute to the other two equation x + y + 5z =2 (1) 4x - 3y + 5z =3 (2) 3x - 2y + 5z=1 (3) my teacher gave me the answer she said the solution set

    asked by Clyde on April 25, 2016
  60. Chemistry

    find the ph of 0.100M NaC2H3O2 solution. do i just write an equation and solve for x NaC2H3O2 +H2O= Na2O + HC2H3O2- 0.100 0 0 so x^2/0.100-x =1.8 X10^-5 x=1.3X10^-3 then do ph=-log(1.3X10-3) ph=2.9 is this right?

    asked by L.Bianchessi on March 6, 2012
  61. chemistry

    If 15.0 mL of a 1.5M HCl solution at 22.5 degrees C is mixed with 25.0mL of a 1.5M NaOH solution at 21.5 degrees C that is in a calorimeter, and the final mixed solution temperature ends up at 28.5 degrees C, 1.)what is the balanced equation for this

    asked by Alison on April 13, 2014
  62. Physics 11

    In the absence of air resistance, a ball of mass m is tossed upward to reach a height of 20m. Given that Fg=mg, what is the net force on the ball at the 10m position (half way up)? a)2mg b)mg c)mg/4 d)mg/2 I already got this wrong bc I had no idea how to

    asked by Kayla on May 30, 2017
  63. chemistry

    a 205 mg sample of diprotic acid is dissolved in enough water to make 250 ml of solution. The pH of this solution is 2.15. A saturated solution of calcium hyrdoxide (Ksp=1.3*10^-6) is prepared by adding excess calcium hydroxide to water and then removing

    asked by cat on March 4, 2012
  64. Statisics

    35%of adult Americans are regular voters. A random sample of 250 adults in a medium-size college town were surveyed, and it was found that 110 were regular voters. Estimate the true proportion of regular voters with 90% confidence and comment on your

    asked by tina on October 5, 2011
  65. CHECK MY CHEMISTRY WORK PLEASE ASAP

    1. You have been given a sample of unknown molarity. Calculate the molarity of a solution which has been prepared by dissolving 8.75 moles of sodium chloride in enough water to produce a solution of 6.22l. 2. You have a sample which consists of 428g sodium

    asked by David on January 10, 2017
  66. History

    1.)which describes a belief of the progressive movement ? A.) the belief that government could correct ills of society B.) the belief that idividual citizens could work to improve social problems C.) the belief that business and the free enterprise system

    asked by Sammy on March 8, 2016
  67. History

    1.)which describes a belief of the progressive movement ? A.) the belief that government could correct ills of society B.) the belief that individual citizens could work to improve social problems C.) the belief that business and the free enterprise system

    asked by Sammy on March 7, 2016
  68. Math

    How many solutions does the system of equations have? y=6x+2 and 3y-18x=12 one two infinitely many none How many solutions does the system of equations have? x-3y=15 and 3x-9y=45 one two infinitely many none How many solutions does the system of equations

    asked by please help 3 days till semester is overrr helpppp on December 16, 2018
  69. 4th grade math

    The school choir has 48 singers with high voices, 53 singers with middle voices, and 39 singers with low voices. the singers stand in 4 equal rows at concerts. How many singers are in each row? How do I show my work for this?

    asked by Ali on February 1, 2015
  70. physics

    IF a particular galaxys has a total mass of 10 to the 56 grams and the average star in that galaxy has a mass of 10 to the 35 grams, approximately how many stars are there in that galaxy? Give your answer to the nearest whole power of 10 by entering the

    asked by arias on January 28, 2017
  71. Physics

    A stone used in the sport of curling has a mass of 20.0 kg and is initially at rest, sitting on a flat ice surface. It is pushed with a constant force of magnitude 25.0N over a distance of 4.00 m. (Assume friction between the stone and the ice is

    asked by Jess on December 3, 2018
  72. Science

    Which of the following shows the levels of organization in a multi-cell organism from the smallest level to the largest level? A- cell, tissue, organ, organ system, organism B- organism, organ system, organ, tissue, cell C- tissue, cell, organ, organ

    asked by Skye on September 19, 2014
  73. physics

    A shopper pushes a grocery cart 20.0 m at constant speed on level ground, against a 35.0 N frictional force. He pushes in a direction 25.0º below the horizontal. (a) What is the work done on the cart by friction? (b) What is the work done on the cart by

    asked by Mohanad on March 10, 2014
  74. Chemistry

    I got pH = 5.3 A 1.00 L buffer solution is 0.250 M in HC2H3O2 and 0.250 M in NaC2H3O2. Calculate the pH of the solution after the addition of 0.150 mol of solid NaOH. Assume no volume change upon the Additon o f NaOH. The Ka value for HC2H3O2 at 25 C is

    asked by Nevaeh on April 29, 2016
  75. math

    What inequality those this graph show: file:///C:/Users/751017272/Desktop/y%20ilt%202x%20plus%202.png (Copy and paste it) Can you show me how you get your answer also?

    asked by PleaseHelp on September 20, 2016
  76. math

    How do you solve sqrt(1-(9/x^2))? I know the answer is sqrt x^2 -9/x but I'm not sure how to get the answer on my own. If you could show steps on how to get the answer that would help me a lot!

    asked by Devin on February 11, 2014
  77. Trigonometry

    A calculator is broken so that the only keys that still work are the sin, cos, tan, cot, sin^-1, cos^-1, and tan^-1 buttons. The display initially shows 0. In this problem, we will prove that given any positive rational number q, show that pressing some

    asked by Sam on October 31, 2013
  78. MATH

    A does 8/15 of a work in 8 days and the remaining work is finished with the assistance of B in 4 days . how long will B take to do the work alone

    asked by MAJUMDER on May 1, 2012
  79. math

    A does 8/15 of a work in 8 days and the remaining work is finished with the assistance of B in 4 days . how long will B take to do the work alone

    asked by majumder on April 22, 2012
  80. math

    A does 8/15 of a work in 8 days and the remaining work is finished with the assistance of B in 4 days . how long will B take to do the work alone

    asked by majumder on April 26, 2012
  81. trigonometry repost .

    This is an outline that i have to use to find the solution of the question. It involves logarithms and half-angle formulas.I have worked though it but got stuck on some parts. I'd like if you look over my work. solve the triangle for which given parts are

    asked by Anon on March 1, 2011
  82. algebra 116

    Rewrite the equation y = 5x – 2 as a function of x. This problem is already a function of x. y = 5x - 2 as a function of x. Rewrite the equation –x – 4y = 20 as a function of x. Graph f(x) = –3x – 2. Solve the system by graphing.

    asked by ashley-help please! on June 24, 2007
  83. math

    2.Two cars leave Kansas City at the same time. One car is moving east and the other west. After 5 hours, the cars are 575 miles apart. One car is traveling 15 miles per hour faster than the other. Let S = the speed of the slower car and F = the speed of

    asked by edgard on January 3, 2017
  84. chemistry

    An aqueous solution containing bromothymol blue is used to identify the chemical properties of thionyl chloride gas. When the gas is bubbled through the bromothymol blue solution color changes from blue to yellow we could say that the gas

    asked by Carley B. on February 8, 2017
  85. maths

    show 14 broken key is 1 show three ways

    asked by bilal on September 16, 2008
  86. Math

    Show 25 broken key is 5 show 2 ways

    asked by Basimah on November 1, 2011
  87. math

    show 14 broken key is 1 show 2 ways

    asked by demarco on October 11, 2010
  88. mathematics:trigonomenty prove

    show that 2cos36=1+2cos72 show step

    asked by mayeriwe on April 11, 2017
  89. algebra

    Essay. Show all work. A gardener wants to create a triangular garden in the shape of a right triangle with the shortest side length x-3y ft. and the middle length side x+6y ft. What ia an algebraic expression for the area of the garden? be sure to multiply

    asked by shay on July 19, 2011
  90. Calculus

    A rotating beacon is located 1 kilometer off a straight shoreline. If the beacon rotates at a rate of 3 revolutions per minute, how fast (in kilometers per hour) does the beam of light appear to be moving to a viewer who is 1/2 kilometer down the

    asked by Jon on November 11, 2007
  91. physics

    A 125.0-N sign is suspended from a horizontal strut of negligible weight. The force exerted on the strut by the wall is horizontal. Draw an FBD to show the forces acting on the strut. (Do this on paper. Your instructor may ask you to turn in this work.)

    asked by melad on February 17, 2011
  92. science

    how does radiation, conduction, and convection work in the human body I found this that may be of some help. Scroll down about 3/4 to the end to a small symbolic picture of a human being. Parts are labeled to show where conduction, convenction, and

    asked by brittany on December 13, 2006
  93. Algebra Help please

    In an experiment, a petri dish with a colony of bacteria is exposed to cold temperatures and then warmed again. Find a quadratic model for the data in the table. Type your answer below. show your work. time hours , 0 1 2 3 4 5 6 Population (1000s) 5.

    asked by Ciaria on March 17, 2015
  94. Calc

    A rotating beacon is located 1 kilometer off a straight shoreline. If the beacon rotates at a rate of 3 revolutions per minute, how fast (in kilometers per hour) does the beam of light appear to be moving to a viewer who is 1/2 kilometer down the

    asked by Jon on November 11, 2007
  95. math

    Susan has $25. She is going to spend $4 on a book, then $3 per day on lunch. a)Write an equation that represents the following question: "How many days can Susan buy lunch using this plan?" b) Solve your equation, and check your solution.

    asked by sam on April 7, 2008
  96. Math

    Solve the inequality. Then graph the solution on a number line. -16 is less than or equal to 2x = 8

    asked by Max on April 17, 2007
  97. Chemistry

    How do you find a molality and molarity of a solution? given the equations Molarity=moles/liters molality=moles solute/kg.of solvent Just that way. Use the definiton. You must have a problem which you can't solve. Post it and tell us what you don't

    asked by Angie on May 9, 2007
  98. Chemistry

    It says prepare a theoretical titration of 25 mL of 0.1037 M formic acid (HCOOH; pKa= 3.75) solution (diluted to 100mL volume with deionized water) by 0.0964 M solution of KOH. It asks to determine the volume of KOH solution needed to reach equivalence

    asked by Anonymous on October 25, 2010
  99. Trig

    Can someone check my answers so far? 1. Find the exact value of tan(-3ð) Answer: tan(-3ð) = tan (-3 + 2ð) = tan (-ð) = tan (-ð + 2ð) = tan(ð) = sin (ð)/cos(ð) = (0)/(-1) = 0 Exact value is 0 2. Solve triangleABC is C = 90 degrees, B = 20 degrees,

    asked by Kasey on January 29, 2009
  100. MATLAB

    I got another MATLAB question that I seem to be struggling with. Use two separate input statements to prompt a user to enter his or her first and last names. Use the disp function to display those names on one line. (You'll need to combine the names and

    asked by Lee on July 21, 2011

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