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  1. Physics

    A rifle is fired in a valley with parallel vertical walls. The echo from one wall is heard 1.0s after the rifle was fired. The echo from the other wall is heard 1.0s after the first echo. How wide is the valley?

  2. Math

    Find the surface area A hemisphere with diameter 70 cm

  3. Algebra

    The perimeter of the rectangle below is 74 units. Find the length of side AB . Write your answer without variables. DC (top) 4z-1 CB (right side) 3z+3 AB (bottom) unknown

  5. Operations Management

    The maintenance department of a hospital uses 816 cases of liquid cleanser annually. Ordering costs are $12, carrying costs are $4 per case a year, and the new price schedule indicates that orders of less than 50 cases will cost $20 per case, 50 to 79

  6. Math.

    1. Find the area of the given circle. Round to the nearest tenth. *theres a picture of a circle and the radius is 3.5* A. 22.0 cm *squared* B.38.5 cm *squared* C. 11.0 cm *squared* D. 42.8 cm *squared* 2.Find the circumference of the given circle. Round to

  7. chemistry

    A water sample contains 102mg of CaSO4 per litre. Calculate the hardness in terms of CaCO3 equivalent.

  8. Algebra

    In six years Jill will be twice as old as Amanda. One year ago Jill was nine times older than Amanda. How old is Jill now? I tried 6 + 2x = x because in six years Jill will be twice Amanda's age, but this doesn't work. I need a formula to work out but

  10. MATH HELP

    1. Which ratios form a proportion? Use equivalent ratios to test each pair. A. 4/9, 2/3 B. 6/15, 9/12 C. 12/16, 15/20 D. 18/ 20, 24/30 2. Which ratio forms a proportion with 20/30? Use equivalent ratios to test each ratio. A. 16/24 B. 10/20 C. 17/51 D.

  11. physics

    You throw a 20-N rock vertically into the air from ground level. You observe that when it is 15.0 m above the ground, it is travelling at 25.0 m/s upward. Use the work-energy theorem to find a) its speed just as it left the ground; b) its maximum height.

  12. History

    According to Laozi, what is the Dao? A.the home of the heavenly spirits B.respect for authority C.the natural way of the universe D.reverence for ancestors What is the main topic discussed in the Analects of Confucius? A.proper behavior and ideals

  13. Math

    Tickets for a play cost Php 250 for adults and Php 200 for children.The sponsor of the show collected a total amount of not more than lhp 44,000 from more than 150 adults and children who watched the play. A. What mathematical statements represents the

  15. Social Studies Lesson 1 Unit 7

    1:Which of the following was a significant innovation of Lowell Mills that increased productivity? A:Combining spinning and weaving in the same factory B:Seperating spinning and weaving to different factories C:Employing mainly formal African-American

  16. Computer Applications

    Develop An Algorithm And Draw the Flowcharts To Find the Sum of Odd Numbers Between 100 And 200

  17. Math Ms Sue please help me

    In the diagram, lines m and n are parallel. If m∠2 = 150°, find the measure of the following angles. lines m and n are parallel. If m∠2 = 150°, find the measure of the following angles 1. ∠4 = ? (1 point) 120º 50º 30º 150º 2. ∠6 = (1 point)

  18. Health

    The number of calories consumed must equal the number of calories________. a.)needed b.)burned c.)absorbed d.)wanted 2.)It is important to recognize which of the following when watching your weight so that you know what triggers your eating habits. a.)

  20. math

    1. Which angles are adjacent angles? (1 point) ∠GBM and ∠FBC ∠CBX and ∠FBC ∠XBG and ∠FBC ∠MBY and ∠FBC 2. The measure of ∠3 is 101°. Find the measure of ∠1. (1 point) 101° 106° 74° 79° 3. Is line l parallel to line m? Explain.

  21. math

    What is 3^-2 (it is 3 to the -2 squared) I thought the answer was 1/9 and my friend thought it is .1 repeated .1 with the line over it can you tell us which one of us is correct? Thank you

  22. Math

    Julia is allowed to watch no more than 5 hours of television a week. So far this week, she has watched 1.5 hours. Write and solve an inequality to show how many hours of television Julia can still watch this week?

  23. Science

    Which best explains mantle convection?

  25. Math

    Three numbers X, Y, and Z are in the ratio 2:7:8. If 12 is subtracted from Y, then three numbers form a geometric sequence (in the order X, Y–12, Z). Find X, Y, and Z. There are two sets of answers I already found one set i am unsure how to find the

  26. Physics

    1,Aclimber Of Mass 80Kg Is On A Steep Rock Face.The Force X That The Rock Exerts On The Climber Is At An Angle Of 50 degree To The Vertical.Y,the Other Force On The Climber,keeps Him In Equilibrium&is Provided By Arope At An Angke Of 40 Degree To The

  27. math

    if sin θ = -7/13 and cos θ= 12/13, find tan θ and cot θ using Quotient Identities.

  28. Physics

    The steering of a car has a radius 16cm . Find the torque produce by a couple of 50N .

  30. social studies

    Identify two specific ways the Catholic Church tried to stop the spread of Protestantism. PLS I NEED HELP ASAP

  31. Math

    3. Solve the equation using substitution. x + y = 8 y = 3x

  32. English

    1. The committee were divided in their opinions. 2. The committee was divided in its opinions. 3. The committee was divided in their opinions. [Which senteces are grammatical?]

  33. social studies

    which of the following was one way different regions of the the country agreed? A. support of slavery B. support for the war of 1812 C. support for foreign policies D. support of economic stability i think its B. am i right?

  35. Math

    A lighthouse flashes its light every 12 minutes. Another lighthouse every 18 minutes. If the two lighthouses flash together at 12:00 noon,at what time will they next flash together?

  36. Calculus

    Find a function f such that f '(x) = 3x3 and the line 3x + y = 0 is tangent to the graph of f. f(x) =

  37. American History

    Based on the information on the map, what can you infer about industry in the United States? A. Manufacturing was a key part of the economy in the Northeast*** B. Agriculture was the main industry in the south C. Mills in the Northeast had to be close to

  38. Math

    1: Classify the quadrilateral using the name that best describes it I tried posting it but it didn't work 2: which statement is a true statement 3: which statement is a true statement 4: Which property is not a characteristic of a polygon 5: Which figure

  40. Math

    Which ratios form a proportion? a. 4/9, 12/25 b. 3/7, 18/42 c. 5/11, 20/45 d. 5/8, 15/25 Which ratio forms a proportion with 18/30? a. 20/35 b. 50/90 c. 36/48 d. 60/100 Which proportion has cross products of 5 x 24 and 8 x 15? a. 5/8=15/24 b. 5/24=8/15 c.

  41. Math

    At what point of the curve y= x^4 is the normal line parallel to 2x + y = 3? Find the equation of the normal line.

  42. social studies

    1.) What influence did Henry Ford have on other industries of the time? A. His keenness for advertising began a marketing revolution? **** B. His creation of the automobile engine directly led to first flight. C. His production of passenger automobiles

  43. Social Studies

    1. According to the passage, what can be inferred about how Elizabeth Cady Stanton’s personal qualities affected the women’s suffrage movement? Her enthusiasm gave the movement a set of core beliefs. Her philosophical views provided the movement with a

  45. math

    the perimeter of a farm is187.2m .if its width is 39m,then find the ratio between its length and width.

  46. Math

    solve the equation 1. y-5/3=1 a) -2

  47. Health.. NEED HELP ASAP

    1. True or False The number of calories consumed must equal the numbers of calories burned A.True B.False 2.Which of the following factors that contribute to your weight do you have the least amount of control over? A. Activity level B. Peers c. Body

  48. Math 4 questions PLZ help me ASAP

    1) Mr. customs is correcting the class's math homework on customary units. which of the following measurements is reasonable? A. a pencil is 12 feet long B. the back porch is 12 inches wide C. the 3rd hole on the golf court is 123 miles long D. the

  50. Science

    1. White skin (W) is dominant over yellow skin (w) in chickens. Which of the following genotypes would result in a white-skinned chicken that could possibly have yellow-skinned offspring? A. WW B. Ww** C. ww 2. Which of the following describes the genotype

  51. Physics

    You are given two transverse waves on a string: f1(x) and f2(x) moving toward each other. At an initial time, the wave f1(x) (lying between 0 and 5 m) moves to the right at v1 = +1 m/s and f2(x) (lying between 5 and 10 m) is moving to the left at v2 = −1

  52. Math 6 help

    The length of a puppy on a scale is 6 cm. If the scale is 1:9cm, what is the actual length of the puppy? 14cm 54cm 48cm 15cm

  53. language arts

    which of the following passages from the text suggests that johnny is becoming less self centered? (chapter 8, Johnny Tremain) 1. Johnny liked the old woman all the better that in the end she had been unable to see a consider master..humiliated, tossed

  55. Algebra 1

    Which method would be the simplest way to solve the system? 7x +5y = 19 -7x-2y = -16 graphing substitution elimination or distributive

  56. Health

    a main function of the skeletal system is to protect internal organs allow your body to move store and produce materials all of the above

  57. English

    An epic is a narrative or poetic literary work that tells of A.) the traditions of an ancient culture. B.) the adventures of a legendary here. C.) the history and myths of a country. I think it is B..?

  58. statistics

    A sample of n = 7 scores has a mean of M = 5. After one new score is added to the sample, the new mean is found to be M = 6. What is the value of the new score? (Hint: Compare the values for ƩX before and after the score was added.

  60. ....

    p w s a f m i x copy the letters above on a piece of paper. cross out the second and last letters. replace all vowels with letters. double the second letter which letter sequence remains on your page? a. ssfmoi b.cffmmc c.sffmoc d.fscfmc

  61. physics

    A force of magnitude Fx acting in the x-direction on a 2.50-kg particle varies in time as shown in the figure below. (a) Find the impulse of the force. (b) Find the final velocity of the particle if it is initially at rest (c) Find the final velocity of

  62. physics

    A 3.1-kilogram gun initially at rest is free to move. When a 0.015-kilogram bullet leaves the gun with a speed of 500. meters per second, what is the speed of the gun?

  63. physical science 2

    the force required to maintain an object at a constant velocity in free space is equal to: b: the mass of the object. c: the force required to stop it. d zero

  65. Chemistry

    Rank the following fertilizers in decreasing order of mass percentage of nitrogen: NH3 NH4NO3 (NH4)2HPO4 KNO3 (NH4)H2PO4 (NH4)2SO4

  66. algebra

    wHeN closed,an entertainment center is mAdE of four square panels.the TiRed smaller panels aRe Congruent squares.wHaT is the scale factor of the larger square to the smaller squares?

  67. language arts

    What does explicit mean?

  68. SS (6th)

    Select the boxes in the table to indicate whether these statements are true about life in Ancient Sparta, Ancient Athens, or both. Athens Sparta Both Slavery was practiced. Boys were trained from birth to be warriors. Only men were considered citizens. The

  70. Language arts

    Read the excerpt from “Amigo Brothers.” The local junior high school across from Tompkins Square Park served as the dressing room for all the fighters. Each was given a separate classroom, with desktops, covered with mats, serving as resting tables.

  71. MATH ALGEBREA 9TH UNIT 6

    which type of correlation is suggested by the scatter plot ? positive correlation negative correlation equal correlation no correlation

  72. World History

    1. Which statement best explains an artistic impact of the Italian Renaissance? (1 point) The use of religious themes in art diminished drastically. Art moved away from realism and toward mystery. Art became more stylized to appeal to wealthy patron

  73. history

    1.Identify one social factor that influenced American imperialism. A. white man’s burden B. spread of religion C. trade opportunities D. spread of democracy 2.Which event proved that the U.S. purchase of Alaska had been a good investment? A. Alaska

  75. Algebra

    The perimeter of the rectangle below is 54 units find the length of side BC. Write without variables side AB is 3Z +3 side BC is 2Z-1

  76. English

    What is an inference? A)the general attitude of a text B) conclusion, based on evidence, about something that is not stated directly in a text C)the special words used in a subject such as art, science, or mathematics D)the facts and information that

  77. Geometry

    SQRT is a parallelogram. If m∠STR = 106°, which of the following statements is true? quadrilateral SQRT has diagonals QT and SR that intersect at point U m∠RTU = 53° m∠QUR = 74° m∠QST = 106° m∠RQS = 106°

  78. Spanish

    1. Which word best describes the action in the picture. A saber B pedir C crear D enviar 2. Which sentence best describes the picture? A Toman un curso B Graban un disco compacto C Tienen mideo D Bajan una cancion 3. Why was the Kennedy Space Center first

  80. Spanish

    1. Which word best describes the action in the picture. A saber B pedir C crear D enviar

  81. Algebra

    The parabola y=x^2 is scaled vertically by a factor of 1/10. What is the equation of the new parabola? y=______ I dont get what it is asking. Please help!

  82. statistics

    The random variable W can take on the values of 0, 1, 2, 3, or 4. The expected value of W is 2.8. Which of the following is the best interpretation of the expected value of random variable W? A. A randomly selected value of W must be equal to 2.8. B.The

  83. Chemistry

    In Part C, you determined that the proper ratio of packages of buns, packages of patties, and jars of pickles is 3:2:4. If you want to feed at least 540 people, but also maintain the proper ratio, what minimum number of packages of buns, packages of

  85. Biology

    describe the energy transformation that occurs during photosynthesis

  86. math

    1. 7 1/2 divided by 3 3/4 2. 9 divided by 2 1/4 3. Sean runs 3 1/2 miles in 28 minutes. How long does it take him to run 1 mile? 4. 8 1/4 pounds of flour are used to make 4 1/8 papier-mache paste recipes. How much flour is used to make 1 recipe? 5. An

  87. Math

    The number of golf balls ordered by customers of a pro shop has the following probability distribution. Find the mean. x|P(x) 3|0.14 6|0.05 9|0.36 12|0.35 15|0.10 A. 7.86 B. 9 C. 6.99 D. 9.66

  88. math

    Rachel is placing playing cards on a table by following these steps. Step 1: First she places one card in the middle of the table. Step 2: Next she adds one more card directly to the left, to the right, above, and below the first card. Step 3: Next she

  90. Earth and Space Science

    According to the law of conservation, both energy and matter are created* in natural systems. Earth as a whole is an open* system, in which energy and matter can move from one subsystem to another. As energy and matter are transferred between subsystems,

  91. Math

    Raymond buys bottles of water at $2.10 each and a large pizza at $12.99. The total cost was $21.39. How many bottles of water b did he buy?

  92. Social Studies

    hi i need help checking my answer How did early contact with China affect Japan? A. The Japanese government became a model for China. B. Japan became a Chinese territory. C. The Japanese adopted the Chinese writing system. D. The original inhabitants of

  93. Math

    A features that displays only the data in column (s) according to specified criteria *

  95. Math/Physics

    Find the magnitude of the resultant force and the angle it makes with the positive x-axis. (Let |a| = 30 lb and |b| = 16 lb. Round your answers to one decimal place.) lal point upward as a 45 degree angle on the first quadrant lbl point downward as a 30

  96. Carson

    What is the molecular geometry shape for H2GeO and is Sel2 polar or non polar. Thanks

  97. Social Studies

    Which of the following was a major goal of the Congress of Vienna? A. to limit the powers of the president of the United States B. to bring lasting peace to Europe C. to split up and limit the power of the German Confederation D. to punish Otto von

  98. English

    "Cynthia in the Snow" by Gwendolyn Brooks 1 It SUSHES 2 It hushes 3 The loudness in the road. 4 It flitter-twitter, 5 And laughs away from me. 6 It laughs a lovely whiteness, 7 And whitely whirs away, 8 To be 9 Some otherwhere, 10 Still white as milk or

  100. Science

    1. How does Earth’s rotation cause day and night? (1 point) As Earth rotates toward the east, the sun appears to rise in the west and set in the east. As Earth rotates toward the east, the sun appears to rise in the east and set in the west. Earth

  101. physics

    On the way to the moon, the Apollo astronauts reach a point where the Moon’s gravitational pull is stronger than that of Earth’s. Find the distance of this point from the center of the Earth. The masses of the Earth and the Moon are 5.98 × 1024 kg and

  102. English

    Read this excerpt from Jonathan Swift’s A Modest Proposal. “I do therefore humbly offer it to public consideration that of the hundred and twenty thousand children already computed, twenty thousand may be reserved for breed, whereof only one-fourth

  103. Math

    Note: Enter your answer and show all the steps that you use to solve this problem in the space provided. The figure shows two right trapezoids. Trapezoid A B C D has right angles at B and C. Angle B is adjacent to the shorter parallel side. Angle C is

  105. Math

    On a baseball diamond, the distance from first base to third base is approximately 127 feet. How many inches is the distance form first base to thrid base? A 381 inches B 1, 524 In. C 42 1/3 inches d 13, 716 inches Can you help me?

  106. math

    After Karen spent 1 4 of her paycheck on a coat, she had $96 left. What was the cost of her coat?

  107. Geometry

    1 - Complete this statement: A polygon with all sides the same length is said to be___. a. regular b. equilateral *** c. equiangular d. convex 2- A road sign is in the shape of a regular heptagon. What is the measure of each angle on the sign? round to the

  108. Health

    Lesson 1: Health, Fitness, and Nutrition A Final Exam Health, Fitness, and Nutrition A Unit 3: Final Exam I need help with the midterm for the class above. It has 52 questions SEND HELP lol

  110. history

    1.Based on this early illustration of the town, what is one reason why Francis Lowell's partners might have chosen this area to build the factory town of Lowell? (image= imgur.com/a/k1Egpoi ) ***A.A river ran through the location and could be used to power

  111. Math

    ΔABC and ΔDEF are similar. Find the values of x and y. Triangle ABC is shown with side AB labeled y, side BC labeled 12, and side CA labeled 21. Triangle DEF is shown with side DE labeled 6, EF labeled 4, and FD labeled x. A. x = 7, y = 12 B. x = 21, y =

  112. Social studies grade 7

    1. A revolution in 1959 led to Cuba becoming A. An independent nation. B. A communist dictatorship --- C. A territory of the united states D.A constitutional democracy 2. Drag the accomplishments to the civilization. Accomplishments may be used more than

  113. World History

    Why was concrete better than stone for building in the Roman empire? A. It was more flexible than stone when dry. B. It was heavier than stone when dry. C. It was lighter and easier to use than stone. D. It was stronger and more durable than stone.Which of

  115. HISTORY

    1. Where did the first civilization of India arise? i need help A. along the Ganges River B. along the Indus and Sarasvati Rivers ****** C. near the coast of the subcontinent D. on the central plateau. 2. What did the Indus Valley civilizations use their

  116. math

    U2 is an Irish band that has been popular for over three decades. The lengths of 80 of their songs were selected at random and are listed in the table below. Lengths of Randomly Selected U2 Songs. ? (seconds) 382 222 214 338 310 559 334 225 177 189 278 300

  117. Social Studies

    Identify two specific ways the Catholic Church tried to stop the spread of Protestantism

  118. math

    Using the vertices: B(-9,1), E(2,3), F(12, -2), G(1,-4). Determine whether BEFG is a rhombus, a rectangle, or a square. List all that apply and show the steps

  120. calculus

    If a ball is thrown into the air with a velocity of 48 ft/s, its height in feet t seconds later is given by y = 48t − 16t2. (a) Find the average velocity for the time period beginning when t = 2 and lasting for each of the following. (i) 0.5 seconds ft/s

  121. Physics

    Some students want to calculate the work done by friction as an object with unknown mass moves along a straight line on a rough horizontal surface. The students have a force probe, a meterstick, and a stopwatch. Which of the following will allow the

  122. AP Statistics

    I was sick and when I came back to school I received this question as homework and I don't understand it... Jenny is a 60 percent free-throw shooter She gets to shoot a second free throw if and only if she makes her first shot. She can score 0 points( if

  123. Social Studies

    What was Alexander Hamilton’s main reason for insisting that all the nation’s debts must be paid in full?

  125. AP Physics 1

    How much work is required to compress a spring, k = 33.3 N/m, from its equilibrium point at x = 0.0 m to x = 5.0 m? I am not sure how to approach a problem like this - what equation do I use? I know work = Force * Distance, but these aren't exactly terms I