Questions Asked on
March 18, 2014

  1. math, please help!

    The table lists how poverty level income cutoffs(in dollars) for a family of four have changed over time. Use the midpoint formula to approximate the poverty level cutoff in 1987 to the nearest dollar. the poverty level cutoff in 1987 was _____ dollars. (

  2. Eric

    Are these correct? 1. Which of the following is a correct statement about homeostasis? a. The effector sends the stimulus to the control center b. The receptor is enhanced by the control center c. The response causes disease d. The receptor sends the

  3. College Algebra

    The table lists how poverty level income cutoffs(in dollars) for a family of four have changed over time. Use the midpoint formula to approximate the poverty level cutoff in 1987 to the nearest dollar. the poverty level cutoff in 1987 was _____ dollars. (

  4. simple physics

    You push downward on a box at an angle 25° below the horizontal with a force of 750 N. If the box is on a flat horizontal surface for which the coefficient of static friction with the box is 0.73, what is the mass of the heaviest box you will be able to

  5. science

    Three point charges are placed on the x-axis. A charge of +2.0 μC is placed at the origin, -2.0 μC to the right at x = 50 cm, and +4.0 μC at the 100 cm mark. What are the magnitude and direction of the electrostatic force which acts on the charge at the

  6. trigonometry

    a clock has a dial face of 12 inches radius the minute hand is 9 inches while the hour hand is 6 inches the plane of rotation of the hour hand is 2 inches above the plane of rotation of the minute hand. Find the distance between the tips of the minute and

  7. Quadratic Functions in Algebra

    Suppose C(x)=x^2−6x+20 represents the costs, in hundreds, to produce x thousand pens. How many pens should be produced to minimize the cost? What is the minimum cost? Number of pens to minimize cost: Minimum Cost:

  8. Language Art (Please Check)

    1.B 2.A 3.B 1.which of the following is an example of a primary source? A.article written by an expert on the event B.letter from the time of the event C.website 2.When gathering information for a research paper,why is making a source card a good idea?

  9. Trigonometry

    Mountain officials want to build a new ski lift from B to C as shown in the figure below. The distance from A to C is 1480 feet. They measure angle DAC to be 32 degrees and angle DBC to be 18 degrees. What is the distance A from to B? Round your answer to

  10. Chemistry

    A 10.00 gram solid sample consisting of a mixture of sodium chloride and potassium sulfate is dissolved in 100.0 mL of water is combined with another 200.0 mL solution that contains excess aqueous lead(II) nitrate. Upon mixing the two solutions, a solid

  11. Chemistry

    The Ksp of tin(II) hydroxide, Sn(OH)2, is 5.45 × 10-27. Calculate the solubility of this compound in g/L.

  12. Algebra

    One more rectangular-shaped piece of metal siding needs to be cut to cover the exterior of a pole barn. The area of the piece is 30 ft². The length is 1 less than 3 times the width. How wide should the metal piece be? Round to the nearest hundredth of a

  13. Chemistry

    Hello! I'm doing these questions for my chemistry homework, and I can only figure out the first one, I don't know how to do the rest, I'm completely stuck! Please help!! Thank you! 1.) For the reaction, calculate how many grams of the product form when

  14. Algebra I

    Solve the linear equation by elimination 10x-9y=46 -2x+3y=10

  15. Chemistry

    A reaction has a standard free-energy change of –10.30 kJ mol–1 (–2.462 kcal mol–1). Calculate the equilibrium constant at 25ºC.? This is what I've done so far.. ∆Gº= -2.3 RT + log (K) -10.31 kJ = -2.3 (.0083145)(298) + log K -10.31 kJ = -2.3

  16. Chemistry

    For the reaction shown, find the limiting reactant for each of the following initial amounts of reactants. 4Cr(s)+3O2(g)→2Cr2O3(s) 1.) 1 molCr; 1 molO2 2.) 4 molCr; 2.5 molO2 3.) 12 molCr; 10 molO2 4.) 14.8 molCr; 10.3 molO2 Express your answer as a

  17. chemistry

    2C3H6(g) + 2NH3(g) + 3O2(g) -> 2C3H3N(g) + 6H2O(g) A 150.0 liter steel reactor at 25 ºC is filled with the following partial pressures of reactants: 0.500 MPa C3H6, 0.800 MPa ammonia, and 1.500 MPa oxygen gas. If the reaction proceeds to 90% yield, and no

  18. PRE-CALC

    A number is selected at random from the set {2, 3, 4, … ,10}. Which event, by definition, covers the entire sample space of this experiment? A) The number is greater than 2. B) The number is not divisible by 5. C) The number is even or less than 12. D)

  19. Chemistry

    This compound is mescaline, a hallucinogen. Which of the following statements is true? Mescaline is an amine. Mescaline contains an alcohol group. Mescaline is a carboxylic acid. Mescaline is an amine and contains an alcohol group.

  20. Chemistry

    Natural gas is almost entirely methane, CH4. What volume of natural gas at 20 C and 1.00 atm pressure is required to heat one quart of water from 20 C to 100 C? The density of methane at 20 C is 0.665 g/mL. The reaction for the combustion of methane is CH4

  21. Chemistry

    I need to vary the surface area by choosing different size beaker. I will put liquid in there so it would have to be volume??cm^3? But the question is how can I calculate the surface area of the beaker ??? The key thing here is the container... Examples:

  22. us history

    How did the Virginia Plan, the New Jersey Plan, the Great Compromise, and the Three-Fifths Compromise lead our current form of Congress?

  23. physics

    A 5.0-nC charge is at (0, 0) and a -2.0-nC charge is at (3.0 m, 0). If the potential is taken to be zero at infinity, what is the electric potential energy of a 1.0-nC charge at point (0, 4.0 m)? Answer 1.5 × 10-8 J 3.6 × 10-9 J 1.1 × 10-8 J 7.7 × 10-9

  24. chemistry

    In the following reaction, how many liters of oxygen produce 560 liters of carbon dioxide in the oxidation of methane, given that both gases are at STP? CH4 + 2O2 ¨ CO2 + 2H2O

  25. physics

    The angle of incidence and the angle of refraction for light going from air into a material with a higher index of refraction are 69.9° and 39.6°, respectively. What is the index of refraction of this material?

  26. Floral design

    During April, a customer asks you to create an arrangement for an invalid friend who must stay at home for five more days. The invalid friend loves flowers, especially fragrant ones. The amount the customer is willing to spend on the arrangement for this

  27. matg

    Kay is trying to decide between two job offers. The compensation package for job A includes 80% of the cost of a $300-per-month health insurance plan, 90% of the cost of a $40-per-month life insurance plan, a salary of $65,000 per year, and a 5% match on

  28. chemistry

    in which of the following pairs of compiunds are both members of the pair ionic compounds? a) PI3 and HBr, b) H2S and NCl3, c)LiF and H2O, d)LiI and NiO

  29. Math

    Two ships left the same port at the same time. One travelled at 16kn/h on a course of 275 degrees while the other at 20 km/h of 225 degrees. How far apart are the ships after a. 2 hours? b. 4 hours? *note: this is a trigonometry question using the cosine

  30. STATISTIC***HELP

    Show all your work. Indicate clearly the methods you use because you will be graded on the correctness of your methods as well as on the accuracy of your results and explanation. A simple random sample of adults living in a suburb of a large city was

  31. science

    Describe an experiment you might perform to determine which leg muscles of a frog are important for jumping long distances.

  32. Term Paper question

    I've started writing a term paper and wondering if there is anyone or any place that I could submit my paper and get feedback before it's graded? It's worth a large portion of my grade & I'd like someone to review it when I'm done.

  33. Chemistry

    What is the enthalpy change if 25.0 g of methane are burned? 890kJ of heat released for every mole of methane that reacts. CH4 + 2O2 = CO2 + 2H2O

  34. Chemistry

    220 J to kilojoules 350 kj to calories 97.0 kcal to joules 35.0 cal to kilocalories How do I convert them?

  35. English

    1-2. My uncle decided to splurge and _____with a country club because golf is his favorite____.(affiliate,deficit) 3-4. Gail didn't ____from smoking cigarettes until her employer made not smoking ____.Keeping her job was a very good incentive to get her to

  36. derivatives

    x^2cosx-2xsinx-2cosx

  37. English Literature

    To laughter and contempt; that she may feel How sharper than a serpent's tooth it is To have a thankless child! Away, away! The dominant figure of speech in this passage is: A) alliteration B) assonance C) simile D) metaphor E) imagery

  38. Chemistry

    2NaN3(s) -> 2Na(s) + 3N2(g) What mass of sodium azide should be loaded in the device to ensure full inflation of the same air bag if the actual reaction can be expected to proceed to give only 83% yield of nitrogen gas?

  39. English

    Read the following sentences from "Five Hours to Simla." The baby let drop its narcotic rubber teat, delighted. Its eyes grew big and shone at all it saw flowering about it. The little girl was perplexed, wondering what to choose from so much till the

  40. PHYSICS

    A 5.00-kg box slides 7.00 m across the floor before coming to rest. What is the coefficient of kinetic friction between the floor and the box if the box had an initial speed of 3.00 m/s?

  41. Math

    A trough is 8 meters long, 3 meters wide, and 5 meters deep. The vertical cross-section of the trough parallel to an end is shaped like an isoceles triangle (with height 5 meters, and base, on top, of length 3 meters). The trough is full of water (density

  42. social studies

    1.D 2.B 4.C 1. the monumental cities of the incas demonstrated their A. extensive trade networks B. high level of organization C. interest in astronomy D. dependence on farming. 2. How does jose de san martin contribute to the formation of nations in the

  43. Algebra

    The distance from the Earth to the sun is 93,000,000 miles. Write this number in scientific notation.

  44. Chemistry

    Determination of Ksp, ΔG°, ΔH° and ΔS° for Ca(OH)2. *** Need help on problem #3 & #4 *** CALCULATIONS: 1. Calculate the average solubility of calcium hydroxide, Ca(OH)2, at each temperature. 2. Calculate the Ksp for Ca(OH)2 at each temperature. 3.

  45. math

    a city had 310 days of sunshine one year and 250 the next year (find the percent of increase or decrease to the nearest tenth of a percent.

  46. accounting

    a simple discount note for $6,600 at a ordinary bank discount rate of 8.61% for 60 days. What is the effective interest rate? Round to the nearest tenth of a percent

  47. Algebra URGENT! Conic sections

    A spacecraft is in a circular orbit 150 kilometers above Earth. Once it attains the velocity needed to escape the Earth's gravity, the spacecraft will follow a parabolic path with the center of Earth as focus. Suppose the spacecraft reaches escape velocity

  48. carver

    Bruce needed two (cupful) of sugar to make punch for four (grandchild).

  49. math

    There are 22 students on the debate team. The number of boys is two more than three times the number of girls. How many boys are on the team?

  50. Physics

    If you try to lift a 2 x 10 plank by applying 25 N force but plank does not move did you do any work?

  51. physics

    A 3.0-kg object moving 8.0 m/s in the positive x direction has a one-dimensional elastic collision with an object (mass = M) initially at rest. After the collision the object of unknown mass has a velocity of 6.0 m/s in the positive x direction. What is M?

  52. Math

    Increase a number by 21, multiply the result by 3, then subtract 9, and divide by 5. If the final result is 30, what number did you start with?

  53. Language Arts

    Need help on the sentence below. Can't decide if it is complex or compound. I know if it didn't have the "and" it would be complex but the "and" is throwing me off. "They listened to many American recordings, and then they added new ideas to their music.

  54. Geometry

    In (triangle)EFG, if m

  55. English

    Sorry, I left out a "mood" Read the following sentences from "Five Hours to Simla." The baby let drop its narcotic rubber teat, delighted. Its eyes grew big and shone at all it saw flowering about it. The little girl was perplexed, wondering what to choose

  56. Skills for Success

    How would Jenny best allocate her income for the month?

  57. finance

    Linda Scales is now employed as the managing editor of a well-known business journal. Although she thoroughly enjoys her job and the people she works with, what she would really like to do is open a bookstore of her own. She would like to open her store in

  58. statistics

    You have an SRS of 15 observations from a Normally distributed population. What critical value would you use to obtain a 98% confidence interval for the mean μ of the population? I know the answer is 2.602...but I do not understand why Tell me if I'm

  59. math

    substitute 400 for x 0.005x^2-45x+12,000

  60. english-essay writing topic

    what is a good topic to write about for a personal essay? it has to be something that is meaningful. PLEASE HELP ASAP!!!

  61. science help

    If water temperature changes in favor of greater oxygen levels how do the population of the fish and wading bird population change in response to the new oxygen over time? I would think the fish population would increase and so would the birds (because the

  62. CHEMISTRY

    The data below has been taken for the reaction of a dye with the hydroxide ion. The reaction was performed at two different hydroxide ion concentrations while the dye concentration was kept constant. What is the rate law? [OH─] = 0.10 M [OH─] = 0.20 M

  63. America history

    6. In Mesoamerica, the shift to basic crops, including corn, beans, and squash, is referred to as the _______ revolution.

  64. Math

    Liam has a bag containing five red, two blue, five green, six yellow and two white marbles that are all the same size and shape. what is the probability of randomly choosing a green marble on the first pick, not replacing it, and then randomly choosing a

  65. Algebra: Quadratic Functions

    A model rocket is launched with an initial velocity of 128 ft/s from a height of 70 ft. The height of the rocket, in feet, t seconds after it has been launched is given by the function s(t)=−16t^2+128t+70. Determine the time which the rocket reaches its

  66. Psychology

    Cognitive neuroscience is an emerging field of study. How should we feel this will impact cognitive psychology and your life?

  67. physics

    A bullet A of mass 2kg travelling at 200m/s emblezes itself in a wooden block of mass 9kg moving in the opposite direction. At 20m/s. Calculate the velocity of the block when the bullet comes to rest inside the block. And what principle is used in the

  68. science question

    If changing conditions lead to decreased oxygen levels in a stream, the carrying capacity of the stream for fish will decrease. Oxygen level in water is therefore a ______with respect to the number of trout that stream can support. Any idea?

  69. chemistry

    Sometimes the basicity of a solution is reported using pOH (pOH = -log[OH-]). What is the a. [OH-] if pOH = 1.90 b. [H3O+] if pOH = 12.94 c. pH if pOH = 9.70

  70. 6th grade Lang

    Can you recheck these? I don't understand. 10. I enjoy it because the temperature is pleasant, and everything is green and pretty. ans: cd (compound) 11. I also love to hear the birds singing in the trees and to watch them building their nests. ans: SS

  71. math***1questions***

    1.B New flowers are being planted in acurcular flower bed with a 14-foot dimeter.if each flower requires 1 square foot of space,about how many flowers can be planted A.308 flowers B.154 flowers C.77 flowers D.66 flowers

  72. solid mensuration

    A prism measuring 5 ft tall with a triangular base whose sides measures 7 ft, 3 ft, and 9 ft. In the base, the distance from the 9 ft side to the opposite vertex is 2 ft.

  73. gaso;ine

    How many gallons of gasoline were sold in 2013

  74. help i have no idea!!!!!!

    1.It took Jack 4 hours to drive from his house to the beach at a speed of 45km/h. If he takes 5 hours to make the return trip home,what will his speed be?

  75. english

    Settlers reached the organ territory in 1840's. Which is the verb of the sentence? a)1840's b)reached c)oregon territory d)settlers

  76. help i have no idea!!!!!!

    2.The distance between Jill's home and her school is 400 meters. She walked 1m/s for five minutes. How many meters does she still have to travel to reach her school?

  77. Physics

    How would i solve this? (30)(Cm)Δ+(335.5)(4.18)Δ(21)=0

  78. help i have no idea!!!!!!

    3.Sam is a mailman who delivers mail in a mail truck. His route is 2 kilometers long. He usually starts his route at 8:00 am and finishes by 12:00pm If Sam decided to get a bigger route that is 12 kilometers long, what does his average speed need to be to

  79. Chem

    Give the formula for the conjugate base of each acid. A.HSO4- B.H3PO4 C.HPO42- I have my answers as h2so4 h2po4 h2po4- my answrers are wrong, please help

  80. math

    y = 4x^2 cosx

  81. Math

    Write a multiplication equation that has a solution of -14.8

  82. STATISTIC ****HELP****

    The tests done to determine if someone is HIV positive are called Enzyme immunoassay or EIA tests. The test screens a blood sample for the presence of antibodies to HIV. Like most tests, this test is not perfect. The table below shows the approximate

  83. help i have no idea!!!!!!

    4. The car was at the 45km marker and drove to the 120km marker. What distance did the car travel?

  84. Trigonometry

    Consider the triangle ABC. Suppose that C=69 degrees, a=45 and b= 9 Carry your intermediate computations to at least four decimal places, and round your answers to the nearest tenth. List all solutions A= B= c=

  85. Science

    what type of bond is a metal cation likely to form?

  86. Math 3

    Lauren is baking dog biscuits to donate to her local shelter. She bakes 130 cookies and wants to package them in plastic bags. If each bag holds 8 biscuits, how many bags will she need to package all of the cookies? Is it 16 or 17 bags? Thanks

  87. math

    1/8 of Tony's are mystery books he had3 mystery books. How many books does he have in all?

  88. Math

    Point A lies at (2, 3) on a coordinate system. If the coordinate axes are rotated 45°, what is its position on the new coordinate system?

  89. Math

    What is the limit of f(x)=4x^2−6/4x^2−1 as x approaches infinity? A) 1 B) 3 C) 4 D) 6 E) -4

  90. Math

    The supply and demand for a business manufacturing toy cars are given by these two equations, where y is the price in dollars per item and x is the number of toy cars sold in thousands. Supply: y = x^2 − x + 0.5 Demand: y = x^2 − 1.6 The two graphs

  91. Science

    how did the discovery of nutrons change the atomic model

  92. Basic English

    9. Which of the following sentences contains a comma splice? A. Our friend, who travelled from Tennessee, was quite tired when he arrived. B. The kitten climbed the drapes, it couldn't figure out how to get down. C. The cruise ship docked on Oahu, then

  93. LA pls help!!!

    1. What is one similarity between the opening paragraphs of "America the Not-So-Beautiful" and "A Glimpse of Home"? #1 point# Both authors share a personal experience. Both authors appeal to the readers' emotions. Both authors identify themselves as part

  94. Math

    Write multiplication equation that has a solution of 9/14

  95. PHYSC101

    Hormones that regulate the development and functioning of reproductive organs are called ________ hormones.

  96. Chemistry

    what would be the molality of a solution if 71g of Cl2 were added to 400 mL of acetone (D=0.788 g/mL)

  97. chemistry

    Calculate the pH of a buffer system composed of 0.880 M C5H5N and 0.660 M C5H5NHNO3. The Kb for C5H5N is 1.70 x 10^-9.

  98. Chemistry

    What does each electron outside of a nucleus occupy?

  99. science

    30 cubic meters of argon gas are kept under constant pressure. The gas is heated from 10.0 degrees Celsius to 293 degrees Celsius. What is the new volume of the gas?

  100. EASY QUESTION IM DUMB

    IF you try to lift a 2x10 plank by applying 25 N force but the plank does not move did you do any work?

  101. math

    D/6 = -10

  102. Science

    Some water molecules are split into hydrogen and oxygen when going from: A. Atmosphere to clouds B. Ocean to atmosphere C. Ground water to surface water D. Surface water to biosphere EXPLAIN!

  103. Physics

    A force of 9.4N pulls horizontally on a 1.2-kg block that slides on a rough, horizontal surface. This block is connected by a horizontal string to a second block of mass m2 = 2.00kg on the same surface. The coefficient of kinetic friction is μk = 0.25 for

  104. HISTORY

    IN VIRGINIA, COLONIST WHO COULD PAY THEIR WAY ACROSS THE ATLANTIC WAS GRANTED 59 ACRES OF LAND TO LEASE. THE TERM FOR SUCH AN ARRANGEMENT IS CALLED'

  105. Chemistry

    Oxygen gas, from the decomposition of KClO3, was collected by water displacement. The pressure and temperature in the lab during the experiment were 451.0 torr and 20.0 C. What was the partial pressure of oxygen?

  106. Math

    Eric and Madison both measured the trading card. Eric says he got 3 inches and Madison says she got 2 3/4th. The teacher says both are right. How is that possible?

  107. Chemistry

    1. Calculate the mass of each compound required to make 25mL of the following solutions: (a) 0.10 M Ni(NO3)2 • 6H2O (b) 1.0 M NaClO4 • H2O (c) 0.11 M trien (C6H18N4) 2. Calculate the concentrations of Ni2+ and trien in a solution prepared by mixing

  108. Science

    For carbon to move from an animal to a car, what processes need to happen? Photosynthesis, combustion, and respiration? Respiration, fossilization, and photosynthesis? Fossilization, decomposition, and respiration? Or respiration, photosynthesis, and

  109. literature

    why do you think audiences were silent at the end of the play of the diary of anne frank

  110. AP Calc

    The base of a solid is bounded by y=|x|+a,

  111. AMERICAN HISTORY

    BEFORE DEPARTING FOR WHAT WOULD BECOME THE PLYMOUTH COLONY, THE SCROOBY SEPARATISTS FIRST LIVED FOR IN A.SCOTLAND B. THE CHESAPEAKE C. THE NETHERLANDS D. BELGIUM

  112. College Algebra

    How to get the answer to a formula if I=ã2P/L relates the coefficient of self-induction, L (in henry's), the energy P stored in an electronic circuit (in joules), and the current I (in amps). Find I if P=120 and L=70. The example I have to go by does

  113. AMERICAN HISTORY

    WHICH HIGH FEDERALIST TRIED TO CRUSH INTERNAL POLITICAL DISSENT AFTER XYZ A. JOHN ADAMS B. GEORGE WASHINGTON C. ALEXANDER HAMILTON D,THOMAS JEFFERSON

  114. math

    Can you help me solve Write in to other ways decimal and percent 4/250

  115. Accounting - need guidance

    On January 1, 2012, Bartell Company sold its idle plant facility to Cooper Inc. for $1,050000. On this date, the plant had a depreciated cost of $735,000. Cooper paid $150,000 cash on January 1, 2012, and signed a $900,000 note bearing interest at 10%. The

  116. History

    how have the metis retain their culture in modern canada

  117. American Goverment

    Which is an important function of county government? A. taxing imports B. overseeing tribal governments C. running elections D. hosting foreign leaders

  118. health

    Drinking in moderation or not drinking at all will typically lead to? A. Weight gain B. Heart disease C. Weight loss D. High blood pressure

  119. Math

    A kaleidoscope is a tube-shaped instrument that contains mirror and colored glass. When a viewer looks in one end, (s)he sees vibrant, changing patterns. Tami sees a kaleidoscope in the shape of triangular prism. It has a height of 4 inches, a base of 5

  120. English

    I have to write a paper on an author and then effectively persuade the audience that this author is an important and influential writer who should be included in the curriculum for a college writing course. I chose Ernest Hemingway. This is my thesis -

  121. chem

    18.1g of ammonia and 90.4g of copper(II) oxide are used in the reaction 2NH3+3CuO=N2+3Cu+3H3O.What is the limiting reactant? How many grams of nitrogen will be formed?

  122. science quiz pls help!!!

    In the following diagram, the green ball changes direction after colliding with the red ball because the red ball has more momentum. True False***? 2. What is the momentum of a 20.0 kg scooter traveling at 5.00 m/s. 4.00 kg m/s 20.0 kg m/s 25.0 kg m/s 100

  123. statistics

    Find the value of z that would be used to test the difference between the proportions, given the following. (Use G - H. Give your answer correct to two decimal places.) Sample n x G n=384 x=314 H n=423 x=329

  124. Biology

    Briefly describe a portal system and give the location of two portal systems in the human body.

  125. Math

    Write in order from least to greatest. +3,-1,-4,+2,0

  126. Science

    1. Where is the Earth's equator located today? Describe the climatic conditions. 2. Compare and contrast the climatic conditions existed during this time today. 3. Answer: What types of fossils would you expect to find here? Explain why based on the

  127. Statistic Help please

    During a given month, P(A)=0.75,P(B)=0.6, and p(A and B). Are these two events independent? are they mutually exclusive. yes;yes yes;no no;yes no;no it cannot be determined yes;no 3. There are two prominent, nationally circulated newspapers, The Wall

  128. statistics

    In a survey of families in which both parents work, one of the questions asked was, "Have you refused a job, promotion, or transfer because it would mean less time with your family?" A total of 200 men and 200 women were asked this question. "Yes" was the

  129. Math help

    1. You roll a number cube numbered 1-6 12 times. p(5)= 2\3. what type of probability is illustrated and why? 2. You draw five cards from a standard deck of 52 cards. p(heart)= 4\5. what type of probability is illustrated and why?

  130. math

    F+7=10

  131. statistics

    Find the critical value for the hypothesis test, given the following. (Give your answer correct to two decimal places.) Ha: ó1 > ó2, with n1 = 7, n2 = 16, and á = 0.05 F=?

  132. physics

    What is the minimal resistance of a 100 W light bulb designed to be used in a 120 V circuit? Answer 12.0 Ω 144 Ω 1.2 Ω 0.83 Ω

  133. math

    -9=6+a

  134. math

    5=7+n

  135. Chemistry

    a 2.500 g sample of a pure compound was analysed and found to contain 1.094 g of nitrogen.determine whether the compound is either NH4NO3 or NH4NO2 .show all by calculations.

  136. science

    What describes the charecteristics of a liquid? A.) It has a fixed volume and shape. B.) It has high energy and expands to fill the container. C.) It has fixed volume and varied shape. D.) It has no fixed volume or shape.

  137. math 7th

    a right triangular prism has a length of 11 units.Its right triangle face has legs of 3 and 4 and a hypotenuse of 5. what is the surface area of the right triangular prism.

  138. Chemistry

    It is commonly known that freshly cut fruits turn a brownish color when exposed to the air for a number of minutes. This is due to the action of the enzyme polyphenoloxidase. It is also well known that the formation of the brown color can be prevented or

  139. Statistic

    A local eye clinic has two doctors. Dr. Kutallot recommends glass 60% of the time and corrective surgery 40% percent of the time. Dr. Lenzie recommends glasses 70% of the time and 30% of the time. 60% of the patients are treated by Dr. Lenzie. No patients

  140. Math

    how to explain to my child this math problem : davia draws a shape with 5 sides .Two sides are each 5 inches long . Two other sides are 4 inches long.The perimeter of the shape is 27 inches . What is the length of the fifth side?

  141. math

    holly's garden is divided into 5 equal sections. she will fence the garden into 3 areas by grouping some equal sections together. what part of the garden could each fenced area be?

  142. English

    Which of the following sentences from "Five Hours to Simla" best illustrates the mood of frustration? (1 point) • "After the first cacophony of screeching brakes and grinding gears. there followed the comparatively static hum of engines, and drivers

  143. Science

    How did the discovery of neutrons change the atomic model?

  144. Science

    What type of a bond is a metal cation likely to form?

  145. PHysiscs

    Four acrobats of mass 83.5 kg, 68.0 kg, 62.0 kg, and 55.0 kg form a human tower, with each acrobat standing on the shoulders of another acrobat. The 83.5-kg acrobat is at the bottom of the tower. (a) What is the normal force acting on the 83.5-kg acrobat?

  146. Science

    Artificial Selection leads to loss of Genetic Variation? or Genetic Equilibrium?

  147. Physics

    If the work required to stretch a spring 4 feet beyond its natural length is 17 foot-pounds, how much work is needed to stretch it 14 inches beyond its natural length? Your answer must include the correct units. (You may enter lbf or lb*ft for ft-lb.)

  148. Math

    Sonya spent 3/8 of her money and then had $9 left. how much money did Sonya originally have?

  149. Honors Physics

    0.5 kg ball at the peak of the kick 16.6 m above the field had a kinetic energy of 35.4 J. How fast was the ball booted by the player on the field?

  150. Probability

    Let X and Y be normal random variables with means 0 and 2, respectively, and variances 1 and 9, respectively. Find the following, using the standard normal table. Express your answers to an accuracy of 4 decimal places. 1. P(X>0.75)= 2. P(X≤−1.25)= 3.

  151. Physics

    During a free kick at a soccer playoff game a 0.5 kg ball at the peak of the kick 16.6 m above the field had a kinetic energy of 35.4 J. How fast was the ball booted by the player on the field?

  152. Math

    I have been stuck on this problem for a while need help on it and soon. It's functions. X Rule Y 10 65 30 45 50 25 70 5 I can't find the rule

  153. Probability

    Random variables X and Y are distributed according to the joint PDF fX,Y(x,y) = {ax,0,if 1≤x≤2 and 0≤y≤x,otherwise.} 1. Find the constant a. 2. Determine the marginal PDF fY(y). (Your answer can be either numerical or algebraic functions of y). For

  154. science

    Please help balance this: CH3COO + CrO4 + H = Cr(OH)3 + CO2 + H2O

  155. grammar

    In The Space Before Each of the Following items, place a C if the capitalization is correct, a zero (0) if it is incorrect. Then insert capitals where should be, and draw a line through capitals that should be small letters. 1.the Rocky Mountains i got C

  156. Math

    What are the axes of symmetry in the graphs of the equations -2x^2 and -2x^2 + 4? I think the vertices are (0,0) and (0,4).

  157. Science

    Which of the following is a mechanism used by humans to defend against any disease-causing organism 1)the creation of antibodies 2)the injection of vaccines 3)the production of mucus membranes 4)the use of antibiotics

  158. Chemistry

    Consider the following hypothetical nuclear breakdown: Fermium-258 (Fm-258) loses three alpha particles and two neutrons. What is the new element that is formed (in terms of chemical symbol, atomic number and atomic mass)? I'm not sure how to express this

  159. Math

    A 15-foot ladder is placed against a vertical wall of a building, with the bottom of the ladder standing on level ground 12 feet from the base of the building. How high up the wall does the ladder reach?

  160. Algebra

    Which of the following is a solution of x² + 14x + 112 = 0? If necessary, round to the nearest hundredth. (1 point) • x = –0.24 • x = –4.24 • 4.24 • no solution

  161. math

    simplifies (8+12)5/6-5A+11

  162. Math

    What is the conterpositive answer to All hummingbird like necter

  163. chemistry

    what type of bonding is phosphoric acid?

  164. Math

    A submarine is rising from a depth of -50 meters at a speed of 0.2 meter per second. Write an equation that represents the depth of the submarine as it rises to the surface.

  165. algebra

    production of two numbers is 19951 and sum of those two numbers is 280 (x+y=280).Without assigned those numbers find difference between them (x-y=?)

  166. Early childhood

    Which of the following is not part of a learning prescription?

  167. Math

    When fX(x) = {1/3, if −2

  168. Math

    When fX(x) = {2e−2x,if x>0, 0, otherwise, we have fY(y) = {g(y),if a

  169. science help

    Renewable resources are resources that are available again and non-renewable are ones that can't be replaced.How do these effect biodiversity? If a non-renewal can't be replaced, I can understand that once it's gone, it's not avaialable, but what about the

  170. trigonometry

    Use a sum-to-product formula to rewrite cos5w+cos2w as a product.

  171. math

    Can you describe some common formulas that you use in your life? Like maybe gas mileage formulas or distance traveled?

  172. Math

    The number of tickets sold each day for an upcoming performance is given by N(x)=-0.3x^2+9x+15, where x is the number of days since the concert was first announced. When will daily ticket sales peak and how many tickets will be sold that day?

  173. math

    a poll finds that 24 of 40 students prefer the zoo for their next field trip. The school has a total 340 students. About how many students at the school would prefer zoo?

  174. General Chemistry

    Sodium sulfate is slowly added to a solution containing 0.0500 M Ca2 (aq) and 0.0290 M Ag (aq). What will be the concentration of Ca2 (aq) when Ag2SO4(s) begins to precipitate?What percentage of the Ca2 (aq) can be separated from the Ag (aq) by selective

  175. Math

    A kite that is 7 feet tall casts a shadow that is 4 feet long. How long would the shadow be if a kite is only 4 feet tall?

  176. vocabulary power unit 5 grade 6

    I am trying to find the meaning of this homework: cicle the letter of the word that is a synonym of the boldfaced word. Can you please help me...PLEASE!!!!

  177. statistics

    Smith is a weld inspector at a shipyard. He knows from keeping track of good and substandard welds that for the afternoon shift 5% of all welds done will be substandard. If Smith checks 300 of the 7500 welds completed that shift, what is the probability

  178. Chemistry

    Suppose you tried to carry out a double replacement reaction by mixing equal voulumes of a solution that contains dissolved NAOH and a solution that contains dissolved NACL. WHat would you expect to happen when the two solutions were mixed? Expain?

  179. Chemistry

    What is the concentration of H3O+ in a solution with the following pH values. Enter your answer in scientific notation. a. 6.66 b. 13.40 c. 13.17 d. 2.39

  180. physics

    A skateboard with mass M rolls down a ramp, starting from rest. It takes time T to roll a distance L along the ramp. In terms of M, T, and L, what is the skateboard’s acceleration down the ramp?

  181. College Math

    This is my last question, I promise! Use U={1,2,3,4,5,6,7,8,9,10} A={2,3,5} B={5,6,7,9} C={1,4,10} to find the set AUB You guys are awesome!!

  182. Algebra

    A scientist measures a speck of sand as having a diameter of 0.00000034. Write this number in scientific notation.

  183. Science/Chemistry

    Is this equation balanced? Does it show that no atoms are lost or gained in chemical reactions? 8Fe + S8 --->8FeS

  184. Algebra

    Is (x+y)2 equal to (x2+y2)? Explain why or why not using an example to support your answer.

  185. Physics

    A 60 kg girl on a swing is pulled 1.5 meters back and then released. The girl oscillates at pi/3 radians per second. How far from equilibrium will the girl be in 4 seconds into the motion? How fast will she be moving at this location?

  186. science help

    why are acids and bases good conductors of electricity?

  187. Chemistry

    How would you start these problems? ...I suppose this is a continuation from this post: (replace the numbers with id=1395127807) But, I have yet figured out the ΔH ̊ and ΔS ̊ . But once that is figured out, how would I start problem #1? Also, for

  188. Linear Algebra

    (-5.1)^0 a. 1

  189. physical science

    Suppose you are camping in the mountains and you need to melt 1.8 kg of snow at 0.0 degC to 70.0 degC. The specific heat of water is 4186 j/kg*C while the latent heat of fusion for water equals 3.34 x 10^5 J/kg. How much heat will be needed? Express in KJ.

  190. Physics

    (Need Help Only For Last Question! I figured out the first two.) A car of mass m = 1130 kg is traveling down a θ = 11 degree incline. When the car's speed is v0 = 11 m/s, a mechanical failure causes all four of its brakes to lock. The coefficient of

  191. Discrete Mathematics

    Two Dice, one red and one white are rolled, what is the probability that the white die turns up a smaller than the red die ?

  192. chemistry

    C6O2H8, Ka = 1.7 x 10-5 calculate pka

  193. chemistry

    It requires 23.2 mL of 0.250 M KOH to titrate 49.0 mL of an HCl solution of unknown concentration. Calculate the initial HCl concentration.

  194. Maths

    write a directed number to show the size and direction of the number. Question john walked 10km east

  195. 4th grade math

    In the school walkathon, Bev walked 2 1/5 miles, Dennis walked 3 2/10 miles, and Natalie walked 2 3/5 miles. what was the total distance they walked. write your answer as a whole number and as an improper fraction.

  196. physics

    A sign is hanging from the ceiling on two threads of equal length, which make an angle $\theta$ of 108.5 "degrees" with each other. What is the tension (in N) in each thread, assuming that the force of gravity acting on the sign is 46.5 N?

  197. Calculus Help

    use logarithmic diff. to find the derivative of the function. Show steps please! so I can see how it is done. Thank you so much! y=(e^(-x)cos^(2)(x))/(x^(2)+x+1)

  198. 4th grade math

    kayla bought a bag of grapefruit. each morning for 5 days she and her father each ate one half of a grapefruit. her mother ate 3 halves total in that time. how much grapefruit did they eat altogether? write your answer as an improper fraction and as a

  199. chemistry

    Balanced equation of the reaction that occurs when the butane in cigarette lighters burns in the presence of enough oxygen

  200. english

    What is the most likely reason the author wrote " Eagle's Flight "

  201. Science

    For carbon to move from an animal to a car, what processes need to happen? Photosynthesis, combustion, and respiration? Respiration, fossilization, and photosynthesis? Fossilization, decomposition, and respiration? Or respiration, photosynthesis, and

  202. Personal

    I have a question about like life... it relates to school as well. Like I have a huge project due THIS Thursday and I helped take care of my friends dogs and I have to take pictures of them and my friend says I can take them now and when I ask her she