1. chemistry

    The level of water in an Olympic size swimming pool (50.0 meters long, 25.0 meters wide, and about 2 meters deep) needs to be lowered 5.0 cm. If the water is pumped out at a rate of 4.7 liters per second, how long will it take to lower the water level 5.0

    asked by jode on May 15, 2014
  2. calculus

    A stone is dropped from the upper observation deck (the space deck) of the CN Tower, 450m above the ground. (a) How long does it take the stone to hit the ground? (b) If the stone is thrown downward with a speed of 5m/s, how long does it take to reach the

    asked by beatriz on December 2, 2010
  3. chemistry

    The level of water in an Olympic size swimming pool (50.0 meters long, 25.0 meters wide, and about 2 meters deep) needs to be lowered 3.2 cm. If the water is pumped out at a rate of 5.0 liters per second, how long will it take to lower the water level 3.2

    asked by Grayson on January 16, 2015
  4. science(velocity&speed)

    these are the only 2 questions i don't get: -how long would it take for a car to travel a distance of 200 km if it is travaling at a velocity of 55 km/hr? is the answer 4hrs and 3 min.? -an an carries food at a speed of 1 cm/s.how long will it take the ant

    asked by please i need help!!! on January 18, 2011
  5. English

    Cn you please help me with these sentences, please? Thank you very much in advance. 1) Do you mind if I change channel to the football match? 2) If there is an earthquake and I'm inside a building, I'll get (or I ge) under a table or desk. 3) If I'm out of

    asked by Mike on February 24, 2011
  6. English

    6.Isn't it a little (far-fetched selfseeking) to suggest that the pollution of our environment is mainly caused by creatures from outer space? far fetched 7.Unless the poor people of the country see some hope of improving their lives there will probably

    asked by Jerald on April 17, 2013
  7. Physics

    As part a of the drawing shows, two blocks are connected by a rope that passes over a set of pulleys. One block has a weight of m1 = 562 N, and the other has a weight of m2 = 758 N. The rope and the pulleys are massless and there is no friction. (a) What

    asked by Sarah Lothrop on September 20, 2010
  8. algerbra 1

    -2/3.[-4/5]= -6-7= A hospital parking lot charges $3.00 for the first hour or part thereof and $1.50 for each additional hour or part thereof. a weekly pass cost $33.00 and allows unlimited parking for 7 days. If each visit Johny makes to the hospital last

    asked by Connie on November 17, 2011
  9. Physics

    I have this very confusing two part question that i am having trouble understanding. For the first question i first created a free body diagram to show the forces acting on both the boxes. However i am unsure of what to do after this since i don't

    asked by joe on February 7, 2017
  10. Physics

    Part one was answered, thank you. This was Part one:A runner is jogging at a steady 6.2 km/hr. When the runner is 4.9 km from the finish line, a bird begins flying from the runner to the finish line at 24.8 km/hr (4 times as fast as the runner). When

    asked by Joseph on August 20, 2015
  11. Language Arts

    Not sure between 2 answers on the question below. What is the BEST way to write this sentence correctly? "David went to the store and bought some bread then he took the long way home." a. David went to the store and bought some bread. Then he took the long

    asked by Brandi on March 12, 2013
  12. Algebra 2

    Make a table with a process column to represent each pattern. Write an expression for the number of circles in the Nth figure. The first figure is 5 circles long and 2 circles wide, the second 5 circles long and 3 circles wide. How do I complete this

    asked by Tabitha on August 24, 2010
  13. Steve/Ms.Sue

    Steve can you please show me how to do this problem? What is the area of the shaded region in the given circle in terms of pi and in the simplest form? the picture shown is of a circle with a triangle from 1 oclock to 3 oclock with a 60 deg opening. the

    asked by Cassie on April 2, 2015
  14. physics

    An Alaskan rescue plane traveling 42 m/s drops a package of emergency rations from a height of 117 m to a stranded party of explorers. The acceleration of gravity is 9.8 m/s2 . Where does the package strike the ground relative to the point directly below

    asked by Anonymous on October 2, 2012
  15. physics

    An Alaskan rescue plane traveling 42 m/s drops a package of emergency rations from a height of 117 m to a stranded party of explorers. The acceleration of gravity is 9.8 m/s2 . Where does the package strike the ground relative to the point directly below

    asked by Anonymous on October 2, 2012
  16. Statistics

    Part 1) Exposure to dust at work can lead to lung disease later in life. In a study of 115 drill and blast workers involved in tunnel construction the mean dust exposure was 18.0 mg-yr/m^3 with a standard deviation of 7.8 mg-yr/m^3 (sample 1). Another

    asked by Rob on March 7, 2011
  17. arithmetic

    one half of the students are girls. one third of the girls have long hair. What fraction of the students are girls with long hair? What percent of the students are girls with long hair?

    asked by Tallyn on April 21, 2011
  18. Algebra

    Here's another problem I'm having a little trouble with: A piece of string is 40 cm long. It is cut into three pieces. The longest piece is 3 times as long as the middle-sized piece, and the shortest piece is 23 cm shorter than the longest piece. Find the

    asked by Celina on November 14, 2008
  19. math

    So I think I have got these down I just really want to double check the answers to these two word questions. Thanks How long will it take for $9500 to grow to $36,300 at an interest rate of 12.4% if the interest is compounded continuously? Round the number

    asked by allison on May 1, 2011
  20. Probability

    A box contains 95 pink rubber bands and 90 brown rubber bands. You repeatedly choose a rubber band from the box, record the color, and put the rubber band back in the box. The results are shown in the table below. Find the experimental probability of each

    asked by I need help on May 5, 2015
  21. Physics

    At the instant the traffic light turns green, an automobile that has been waiting at an intersection starts ahead with a constant acceleration of 2.50 m/s^2. At the same instant, a truck, traveling with a constant speed of 15.4 m/s, overtakes and passes

    asked by Josh on September 12, 2006
  22. physics

    When the lights of an automobile are switched on, an ammeter in series with them reads 9.70 A and a voltmeter connected across them reads 12.20 V. When the electric starting motor is also turned on, the ammeter reading drops to 7.30 A and the lights dim

    asked by Ted on April 13, 2015
  23. math

    Nakim simplified 3 times the square root of 2x plus x times the square root of 8x minus 5 times the square root of 18x and got -10x times the square root of 2x for an answer. Part 1: Using complete sentences, explain what Nakim did wrong. Part 2: Show all

    asked by kidd on July 9, 2013
  24. Physics

    Two objects of different masses are joined by a light rod. a) Id the moment of inertia about the center of mas the minimum or maximum and why? b) If the two masses are 3kg and 5kg and the length of the rod is 2m, what are the moments of inertia of the

    asked by Anna on November 22, 2015
  25. math

    walkie talkie phone company charges $18.00 for basic phone service per month and $0.15 per minute for long distance calls. Arena calls charges $80.00 per month with no fee for long distance calls. For what number of minutes of long distance calls is the

    asked by sonia on August 10, 2013
  26. CHem Part 2

    Part of the SO2 that is introduced into the atmosphere by combustion of sulfur containing compounds ends up beingh converted to sulfuric acid. 2SO2 (g) + O2 (g) ---> 2H2SO4 (aq) How much sulfuric acid can be formed from 5 moles of SO2, 2 moles of O2 and an

    asked by Kim on November 1, 2006
  27. geomary

    in sunlight, a vertical stick 7 ft tall casts a shadow 3 ft long. At the same time a nearby tree casts a shadow 11 ft long. How tall is the tree?Round to the nearest tenth.

    asked by quannia on March 20, 2014
  28. physics

    A cowboy at a ranch fills a water trough that is 1.5 meters long, 65 cm wide and 45 cm deep. He uses a hose having a diameter of 2 cm, and the water emerges from the hose at 1.5 m/s. How long does it take the cowboy to fill the trough?

    asked by Bridget on November 11, 2010
  29. prealgebra

    At the same time that a 60-foot tall building casts a shadow that is 21.5 feet long, a nearby tree casts a shadow that is 18 feet long. Which measure is closest to the height of the tree?

    asked by Mary on August 15, 2012
  30. math

    Gary measured the middle school and made a scale drawing. He used the scale 1 inch = 5 feet. The gym is 85 feet long in real life. How long is the gym in the drawing?

    asked by Anonymous on February 17, 2015
  31. Economics

    the price of labor is $100 per unit and the price of capital is $20 per unit. What will the long-run total cost and long-run average cost of producing 120 units?

    asked by Maria on February 6, 2011
  32. Math

    The function H described by H(x)= 2.75x + 71.48 can be used to predict the height, in centimeters, of a woman whose humerus( the bone from the elbow to the shoulder) is x cm long? Predict the height of a woman whose humerus is 35 cm long. Is this correct?

    asked by Kelly on January 31, 2010
  33. Math

    Last month you made long-distance calls to two of your friends. One call lasted 8 min longer than the other. According to the phone bill,the two calls lasted a total of 42 min. How long was each call?

    asked by Kelsie on August 17, 2011
  34. algebra

    A 33-foot-long speaker wire is to be cut into three pieces. One piece is to be 11 feet long. Of the remaining pieces, one must be 2 feet less than 3 times the length of the other. Find the length of the shorter piece

    asked by t on April 16, 2013
  35. Chemistry

    A student is given a sample in lab which contains one of the ions listed below. After adding a few drops ofsolution to part of the unknown sample, the student got a greyish precipitate. After adding a few drops ofsolution to another part of the unknown

    asked by Sam on April 6, 2010
  36. Chemistry

    A student is given a sample in lab which contains one of the ions listed below. After adding a few drops ofsolution to part of the unknown sample, the student got a greyish precipitate. After adding a few drops ofsolution to another part of the unknown

    asked by Evelyn on March 30, 2010
  37. Chemistry

    23. Ductility is the ability to be hammered into sheets.- F? 25. A monatomic ion contains only one atom.- T 26. Iron (II) means the iron would have an oxidation number of +2.- F? 27. A polyatomic ion is a group of atoms acting as a single ion.- T 30. The

    asked by mysterychicken on October 25, 2010
  38. physics

    Suppose a cylindrical habitat in space 7.70 km in diameter and 25.0 km long has been proposed. Such a habitat would have cities, land, and lakes on the inside surface and air and clouds in the center. They would all be held in place by rotation of the

    asked by Rachel on March 11, 2011
  39. Biology

      How does mitosis in plant cells differ from that in animal cells?      A. Plant cells lack centrosomes.">A. Plant cells lack centrosomes.B. Plant cells lack spindle fibers.">B. Plant cells lack spindle fibers.C. Animal cells lack a cell

    asked by Brooklyn on June 25, 2015
  40. physics

    It is night and a wilderness camper is in distress. To signal for help, they take a flare gun into a clearing and fire a flare up from the ground at a speed of 15 m/s. a) How high does the flare make it into the sky? b) How long is the flare in the sky? c)

    asked by Anonymous on January 26, 2015
  41. Maty álgebra

    Avatar la the answer of a plumber has a very long piece of pipe that is used to run city water parallel to a major roadway.The pipe is cut into two two sections.One section of pipe is 12ft.shorter than the other.If 34 of the leght of they shorter pipe is

    asked by Nahomy on January 18, 2017
  42. Physics

    A 550 turn solenoid is 15 cm long. The current in it is 33 A. A 3.0 cm long straight wire cuts through the center of the solenoid, along a diameter. This wire carries a 22 A current downward( and is connected by other wires that don't concern us). What is

    asked by jenish on March 2, 2008
  43. English

    1 When he awoke, it was three o’clock in the afternoon. He bounded up with a start; half of one of 2 his precious days gone already! He spent more than an hour in dressing, watching every stage of his 3 toilet carefully in the mirror. Everything was

    asked by Lauren on January 31, 2018
  44. Pre-Algebra

    8. Mark needs to cut a piece of glass to replace a broken window. He has four pieces of glass: 6 feet long, 5 feet long, 3 feet long, and 7 feet long. If the length of the glass he needs to cut is square root 20 feet long, which piece of glass should he

    asked by Lelolel on September 26, 2017
  45. Business Finance

    1. When a number of alternative methods of long-term financing are under considerations; what conditions favor the use of long-term debt. 1a.When a number of alternative methods of long-term financing are under considerations; what conditions favor the use

    asked by Andrea Williams on August 21, 2009
  46. Biology

    I am doing a chart on function and structure and i am stumped by this question Modified cell products must arrive to specific docking sites—where they are necessary— What structure tells the vacuole to dock where it needs to? - Would this be the

    asked by Bongo on October 11, 2007
  47. English

    I still have a few sentences to check. Thank you very much, Writeacher. 1) I would worl at a passion (my passion), because even if I know it is difficult to take off, I think that the job itself can motivate me. In fact, I'd prefer to have a job in which I

    asked by Matthew on April 11, 2012
  48. Anatomy

    which of the following was required before widespread organ donation could be successful? A) adenovirus-36 research B) embryonic stem cell research C) techniques to decellularize organs D) development of immunosupprecent drugs*** I think it is D because

    asked by Anonymous on May 26, 2018
  49. Calculus

    I have a two part question that pertains to a curve (r(x)) and its tangent line at x=3. We are given that at x=3, r(x)=8. In order to find the slope of the tangent line, we are given another point (on the tangent line): (3.2, 8.5). Therefore the slope of

    asked by Lauren on March 31, 2009
  50. geom/trig

    Using scissors to cut a rectangular piece of paper from one corner ro the opposite corner. The cut is 36 cm long and makes a 34 degree angle to the uncut edge. How many cm long is the paper (from the corner where he started the cut?

    asked by lola on January 16, 2012
  51. English

    Part (a) – What theme do you think the poet is exploring in this poem? Part (b) – How does the poet use language in this poem to present his ideas? The poem is = FARM CHILD Look at this village boy, his head is stuffed With all the nests he know, his

    asked by Daniel on November 12, 2014
  52. English

    Read the sentences. The Arctic region, where winters are long and cold, is home to more than 400 species of flowering plants. Which group of words is an adjective clause in the sentence? A) is home to more than 400 species of flowering plants B) of

    asked by M, S, E, on May 5, 2017
  53. Chemistry. Please help!

    A 20.29 g sample of impure MgCO3 is completely decomposed at 1000oC in previously evacuated 2.0 L reaction vessel. After the reaction was complete the solid residue had a mass of 15.9 g. Assume that only MgCO3 could produce gas CO2 what percent of original

    asked by Jordan on December 3, 2008
  54. math

    A carpenter is constructing a triangular roof for a storage shed as shown in the figure. Part A isosceles triangle = 15 degrees and 15 degrees length of bas is 45 How high will the peaks of the rise above in the top of the shed? b/2 = 22.5 tan(15) = h/22.5

    asked by kudu on November 27, 2015
  55. why won't anybody help me

    The region R, is bounded by the graphs of x = 5/3 y and the curve C given by x = (1+y^2)^(1/2), and the x-axis. a) Set up and evaluate an integral expression with respect to y that gives the area of R. b) Curve C is part of the curve x^2 - y^2 = 1, Show

    asked by PLEASE HELP! on March 2, 2008
  56. MATH-HELP!

    The region R, is bounded by the graphs of x = 5/3 y and the curve C given by x = (1+y^2)^(1/2), and the x-axis. a) Set up and evaluate an integral expression with respect to y that gives the area of R. b) Curve C is part of the curve x^2 - y^2 = 1, Show

    asked by PLEASE HELP! on March 2, 2008
  57. math

    A rectanglar blacktop with a length of 5x and a width of 3x has been erected inside a rectangular field that has a length of 12x and a width of 7x. What is the area of the part of the field that is not blacktop? (I believe the answer is 69x^2) There is a

    asked by Jane on March 1, 2013
  58. general chemistry

    What is the radius of the largest sphere that can be placed at the center of a face-centered cubic unit cell of a cubic closest-packed array of spheres if the spheres have radius of 2.0 x 10^2 pm?

    asked by StressedStudent on March 24, 2013
  59. Chemistry

    How many grams of CO2 is produced from 855 grams of C6H12O6 in the process of cell respiration? Please further discuss the solution on how to get convert the mols of glucose to mols of CO2. Thank you.

    asked by Anonymous on September 20, 2016
  60. Instrumental

    A complex was formed between Ni (II) and 1-cyclopentene-1-dithiocarboxylic acid (CDA). The measurements were made at 530 nm in 1.00-cm cell. Find the formula of the complex. C(CDA)=1.00x10^-3 C(Ni)-1.00x10^-3

    asked by Anonymous on March 10, 2011
  61. AP CHEM please help

    Write the standard line notation for each cell below. IO3-(aq) + Fe2+(aq)--> Fe3+(aq) +I2(aq) ________________________________________ H2O2 + 2 H+ + 2 e- --> 2 H2O E = 1.78 V O2 + 2 H+ + 2 e- --> H2O2 E= 0.68 V ________________________________________ Mn2+

    asked by Janvi on March 6, 2012
  62. WRITING

    Some say that texting on a cell phone is a bad thing for students focus, but their is a simple thing we can do is by having the teachers go around the classroom to see if students are texting. how can i fix this run-on sentence

    asked by LAUREN on May 25, 2010
  63. Creative Writing. ms.sue

    ok ms.sue. i'v fixed everything you told me to in the four paragraphs. now please just check the last paragraph. and i'm done with the essay: Has there ever been a time or situation when you had a great amount of emotions going through your head? For me it

    asked by y912f on October 13, 2009
  64. physiology

    Match each term with the appropriate description. A. peptide hormone B. steroid hormone C. amino acid-derived hormone D. anterior pituitary E. hypothalamus F. posterior pituitary lipophobic molecule that interacts with receptors on cell surface

    asked by lilianna on November 7, 2012
  65. Chemistry

    The voltage generated by the zinc concentration cell described by, Zn(s)|Zn2+ (aq, 0.100 M)||Zn2+ (aq, ____ M)|Zn(s) is 24.0 mV at 25 °C. Calculate the concentration of the Zn2 (aq) ion at the cathode. My textbook advised me to use the Nernst Equation and

    asked by Katherine on June 3, 2012
  66. English

    When you say something like, "the shark had a long narrow slit in the eye," in what context is the word slit used. Does it mean evil? What does the term 'craft technique' mean? Example:"What is one author's craft technique found in this text that makes the

    asked by Gina on November 8, 2006
  67. biology pleaseehelp!

    In order to produce many copies of a protein fast, the cell uses A. DNA replication. B. intron self-splicing. C. single-unit ribosomes for high speed translation. D. codon-anticodon reciprocal duplication. E. many RNA polymerase molecules to produce mRNA

    asked by sabrina on May 13, 2011
  68. Biology

    Is there any biology websites for teens??? (NOT games! notes and quizzes to practice). The Science of Biology The Chemistry of Life Cell Structure and Function Photosynthesis & Respiration Something REALLY easy to understand(btw I'm going to the 9TH

    asked by Laruen on July 17, 2013
  69. philosophy

    Do you agree with the final statement in paragraph #4 on pages xiii xiv in The Contract; namely, "The only way to get justice is to have impartial, wise rulers who give people what is right, not what the people think they want"? Use a current moral issue

    asked by lunemise on June 10, 2012
  70. Biology quick please

    I need a practice biology test to practice for my final exam which is tomorrow. I'm a tenth grader and the things we learned were mitosis, meiosis, production of gametes, human reproduction, cell devision, mendelian genetics, probablitity of inheriting

    asked by Rachel on December 15, 2009
  71. Finance

    (Break-even analysis) Acquiring more energy-efficient equipment would cost $80,000 now and yield savings of $20,000 in energy costs every year for the next 8 years, after which its salvage value will be 0. The discount rate is 8%. (1) Based on a before-tax

    asked by John on April 8, 2011
  72. Physics please help!!!!!!!

    A ball is thrown vertically upward (assumed to be the positive direction) with a speed of 21.0 m/s from a height of 9.0 m. (a) How high does the ball rise from its original position? (b) How long does it take to reach its highest point? (c) How long does

    asked by Steve on November 17, 2011
  73. Physics

    A young girl with mass 39.5 kg is sliding on a horizontal, frictionless surface with an initial momentum that is due east and that has magnitude 85.5 kg⋅m/s . Starting at 0 s , a net force with magnitude F=( 8.35 N/s )t and direction due west is applied

    asked by Clara on October 26, 2017
  74. English

    1. It's been a long time. 2. It's been a long time since we've met. 3. It's been a long time since we met each other last. 4. It's been a long time since I met you last. -------------- Are they all the same in meaning? Does #1 mean #2, #3, or #4?

    asked by rfvv on August 25, 2014
  75. Science

    In gunea pigs , short har (L) is dominant to long hair (l) and heterozygous conditions of yellow coat (cy) and white coat (Cw) give cream coat. A short-haired, cream guinea pig is bred to a long-haired, white guinea pig, and a long haired , cream baby

    asked by Ronia on May 25, 2011
  76. Science

    In gunea pigs , short har (L) is dominant to long hair (l) and heterozygous conditions of yellow coat (cy) and white coat (Cw) give cream coat. A short-haired, cream guinea pig is bred to a long-haired, white guinea pig, and a long haired , cream baby

    asked by Ronia on May 25, 2011
  77. English

    Their Eyes Were Wtaching God By:Nora Zeal Hurston. "to be a pear tree - any tree in bloom!" (11). The image suggests a wholeness - as bees pollinate blossoms paralleling human sexual intercourse. What does that mean? What is another way to say that? Bees

    asked by Margie :D on August 8, 2007
  78. trigonometry

    At a swim meet, a parent is videotaping his son from a seat in the stands that is 20 meters past the starting line and 8 meters away from his son's lane. Let x represent the distance the son has swum. a. Write x as a function of (theta). b. At what angle

    asked by Nick on December 7, 2014
  79. physics mechanical energy and power

    A car m = 1850 kg is traveling at a constant speed of v = 30 m/s. The car experiences a force of drag (air resistance) of Fd = 300 N. Write an expression for the power the car must produce Pi to maintain its speed. Part (b) What is the power in HP? No

    asked by carlo on October 7, 2013
  80. Math

    At a swim meet, a parent is videotaping his son from a seat in the stands that is 20 meters past the starting line and 8 meters away from his son's lane. Let x represent the distance the son has swum. a. Write x as a function of (theta). b. At what angle

    asked by Lindsey on December 7, 2014
  81. Pre-Calc

    At a swim meet, a parent is videotaping his son from a seat in the stands that is 20 meters past the starting line and 8 meters away from his son's lane. Let x represent the distance the son has swum. a. Write x as a function of (theta). b. At what angle

    asked by Connor on December 7, 2014
  82. math

    At a swim meet, a parent is videotaping his son from a seat in the stands that is 20 meters past the starting line and 8 meters away from his son's lane. Let x represent the distance the son has swum. a. Write x as a function of (theta). b. At what angle

    asked by Abby on December 7, 2014
  83. Mathematics

    What metric unit would you use to measure the length of 1.a cell phone 2.a basketball court 3.a telephone pole What metric unit would you use to measure the mass of 1.a kitten 2.an orange 3.a bee 4.a horse

    asked by Cedric on January 3, 2018
  84. Mathematics

    What metric unit would you use to measure the length of 1.a cell phone 2.a basketball court 3.a telephone pole What metric unit would you use to measure the mass of 1.a kitten 2.an orange 3.a bee 4.a horse

    asked by Cedric on January 2, 2018
  85. Science

    Al+(Cr2O7)2- = Al3+ + Cr3+ [al3+]=0.01M [(cr2o7)2-]= 0.1M [cr3+]=0.001M find the E cell if we add Naoh to each electrode until al(oh)3 precipitates pH=8 KPT of al(oh)3=5 * 10 -33 Eal=-1.66 V Ecr=1.33V

    asked by Lorela on February 20, 2016
  86. chem

    The full inoic equation for an electrochemical cell is Br2 + Zn yields 2Br- + Zn2+. write the half reaction that occurs at the anode and the half reaction that occurs at the cathode

    asked by Jessica on June 7, 2010
  87. Chem Check Please!!!

    Calculate for the electrochemical cell below, Ag(s) | AgCl(s) | Cl–(aq) || Cu2+(aq) | Cu(s) given the following standard reduction potentials. Cu2+(aq) + 2 e– -> Cu(s) E = +0.337 V AgCl(s) + e– -> Ag(s) + Cl–(aq) E = +0.222 V a. –0.115 V b.

    asked by Anonymous on May 6, 2014
  88. Bio

    Assume that a cell culture has a density of 108 cells/mL. You transfer 20 microliters (20 L) of this culture onto a microscope slide. How many cells do you expect will be in this 20 L drop you placed under the microscope?

    asked by Brittany on September 13, 2012
  89. Physics

    Suppose that the resistance between the walls of a biological cell is 4.9 × 10^9 ohms (a) What is the current when the potential difference between the walls is 68 mV? (b) If the current is composed of Na+ ions (q = +e), how many such ions flow in 0.45 s?

    asked by Drue on April 1, 2013
  90. Science

    The cell theory was A: developed by Robert Hooke B: developed before microscopes were invented C: developed only after electron microscopes became widely used D: developed by many scientists over many years Is the answer A?

    asked by Anonymous on January 21, 2015
  91. Algebra1

    A CELL PHONE ORDDERS 500 NEW PHONES FROM A MANFACTURE.IF THE PROBABLITY OF A PHONE BEING DEFECTIVE IS 2.6% PREDICT HOW MANY OF THE PHONES ARE LIKELY TO BE DEFECTIVE.ROUND TO THE NEAREST WHOLE NUMBER

    asked by devin on December 5, 2011
  92. Physics

    How will the balancing length of a potentiometer be affected if resistance in the primary cell is increased or decreased? Will the balancing length change if a resistance is introduced before the jockey ?

    asked by vin on February 28, 2015
  93. Algebra 1

    The monthly cost C for a cell phone is $20 each month plus $.10 for each minutes used. Which equation can be used to find the total cost (in dollars) for a month when m minutes are used? A. C= m+20 B. C= 0.1m+20 C. C= 10m+20 D. C=20m

    asked by Anonymous on September 18, 2014
  94. Math

    "Molly had (4x + 10) dollars. Ron has (-5x + 20) dollars. How much money do they have all together?" For this part I got -x + 30 dollars, but the problem comes when I see the next part: "How much more money does Molly have than Ron?" Now how to I calculate

    asked by Malala on August 11, 2015
  95. Physics

    Essay Question: discuss whether or not it is possible for an object to be increasing in speed as its acceleration is decreasing. For either position you take, use examples as part of your explanation. CAN SOMEONE HELP SUGGEST AN EXAMPLE THAT WOULD HELP

    asked by Colleen on January 6, 2016
  96. English

    Can you check if the following sentences are grammatically correct? Thank you very much for your invaluable help. 1.Septimus is not understood by his wife. 2.Clarissa and Septimus have both a weak personality OR …. both have 3.In the third kind of

    asked by Franco on May 31, 2010
  97. physics

    (a) 2.0 kg of molten copper at its melting point of 1083 ºC (the copper is 100% liquid) is poured into a mold in a cooling water bath at 20 ºC. What mass of water is needed to bring the solidified copper and water to an equilibrium temperature of 30 ºC,

    asked by nicole on December 11, 2006
  98. Math

    An observer atop a cliff sees a speedboat approaching a dock located at the base of the cliff directly below the observer. Express the distance, d, from the observer tot he boat as a function of the distance, x, from the boat to the dock, if the cliff is

    asked by Brad on June 24, 2016
  99. Physics

    Can someone please give me some insight on how to work this problem? A rotating door is made from four rectangular glass panes, as shown in the drawing. The mass of each pane is 85 kg. A person pushes on the outer edge of one pane with a force of F = 63 N

    asked by Jim on March 21, 2007
  100. physic

    Craig launches the basketball at an angle of 65.0 degrees above the horizontal from a height of 2.00m above the floor.He imparts a speed of 9.70 m/s to the ball and leaves his hand a horizontal distance of 7.25 m from the center of the hoop if the hoop is

    asked by juliet edmund on February 5, 2013