Questions Asked on
October 7, 2012

  1. Statistic

    Mamma Temte bakes six pies a day that cost $2 each to produce. On 15% of the days, she sells only two pies. On 27% of the days, she sells 4 pies, and on the remaining 58% of the days, she sells all six pies. If Mamma Temte sells her pies for $4 each, what

    asked by Anonymous
  2. Physics

    A billiard ball strikes and rebounds from the cushion of a pool table perpendicularly. The mass of the ball is 0.38 kg. The ball approaches the cushion with a velocity of +2.10 m/s and rebounds with a velocity of -2.00 m/s. The ball remains in contact with

    asked by Cheng
  3. chemistry

    describe step by step, how will you prepare 10 mL of 0.020 M HCL from the 0.050 M solution?

    asked by cristina
  4. Chemistry

    What are three common types of products produced by reactions that occur in aqueous solutions? (out of the following) -gases -water -electrons -precipitates -acids -ions -bases

    asked by Anya
  5. Chemistry

    Which of the following molecules has the highest boiling point? CH4,BH3,NH3, SH2?

    asked by Jennifer
  6. Chemistry

    Nitrogen and hydrogen combine at high temperature, in the presence of a catalyst, to produce ammonia. N2(g)+3H2(g)-->2NH3(g) Assume 4 molecules of nitrogen and 9 molecules of hydrogen are present. After complete reaction, how many molecules of ammonia are

    asked by Lynn
  7. math

    You've just received an order of silk flower arrangements from your wholesaler. You paid $20.00 for them. Your store uses a 10% markup rate. What is the selling price of the ilk flower arrangements?

    asked by nana
  8. physics

    A car is driven 215 km west and then 85 km southwest. What is the displacement of the car from the point of origin magnitude and direction draw a diagram.? I kinda understand how to do this but in order to solve this you need to get a 45 degree angle and i

    asked by bubbles
  9. math

    A 750 kg skier rides a 2830 m long lift to the top of a mountain. The lift makes an angle of 14.6˚ with the horizontal. What is the change in the skier’s gravitational potential energy?

    asked by grace lopez
  10. math

    what is 18.75 rounded to the nearest tenth?

    asked by Anonymous
  11. math

    a ball is thrown upward at 64 feet per second from the top of an 80 feet high building. The height of the ball can be modeled by S(t) = -16t^2 + 64t + 80(feet), where t is the number of seconds after the ball is thrown. describe the graph model

    asked by nina
  12. Chemistry

    The combustion reaction for benzoic acid C6H5CO2H(s) + 15 2 O2(g) → 7 CO2(g) + 3 H2O(ℓ) has ∆H0 = −3226.7 kJ/mole. Use Hess’s Law to calculate ∆H0 f for benzoic acid.

    asked by Austin
  13. Physics

    A typical laboratory centrifuge rotates at 4100 rpm. Test tubes have to be placed into a centrifuge very carefully because of the very large accelerations. (a) What is the acceleration at the end of a test tube that is 11 cm from the axis of rotation?

    asked by Mark
  14. QNT/351

    7) Shoe sizes, such as 7B, 10D, and 12EEE, are examples of what level of measurement? A. Nominal B. Ordinal C. Interval D. Ratio

    asked by JAZE
  15. Physics

    A ball weighing 50N is pulled back by a rope to an angle of 20 degrees (the rope that the ball hangs from). Find the tension in the pulling rope.

    asked by Kristen
  16. Chemistry

    Suppose 2 grams of an unknown metal carbonate MCO3 is reacted with excess HCl and 0.88 grams of CO2 are produced. What is the atomic mass (molar mass) of the unknown metal M? What element is it?

    asked by Anonymous
  17. physics

    A crate is pulled to the right with a force of 84.5 N, to the left with a force of 116.5 N, upward with a force of 685.7 N, and downward with a force of 242 N. What is the net external force in the x direction?

    asked by jane
  18. chemistry

    Technetium-99m emits only gamma radiation. Why would this type of radiation be used in diagnostic imaging rather than an isotope that also emits beta or alpha radiation?

    asked by Boo Boo
  19. physics

    73. A mobile is formed by supporting four metal butterflies of equal mass m from a string of length L. The points of support are evenly spaced a distance apart as shown in Figure P5.73. The string forms an angle 1 with the ceiling at each end point. The

    asked by audree
  20. Maths

    30% of the rabbits from a farm were lent to a zoo. After a month, 5/6 of the rabbits were returned to the farm. There were 228 rabbits in the farm now. a.) How many rabbits were lent to the zoo in the beginning? b.) How many rabbits were there at the farm

    asked by Student56
  21. chemistry

    How could you use a precipitation reaction to separate the following pair of cations: K^+ and Hg2 ^2+? (write the formula and net formula for each reactant)? The answer is Hg2 ^2+ (aq) + 2Cl- (aq) = HgCl2(s) but how do I work it out?

    asked by Lydia
  22. physics

    A cart is propelled over an xy plane with acceleration components ax = 5.1 m/s2 and ay = -2.9 m/s2. Its initial velocity has components v0x = 8.2 m/s and v0y = 11.2 m/s. In unit-vector notation, what is the velocity of the cart when it reaches its greatest

    asked by tatiana
  23. Chemistry

    One mole of carbon (12.0 g) in the form of crystalline graphite is burned at 25 ◦ C and 1.000 atm pressure to form CO2(g). All of the heat produced is used to heat a 4560 g bath of liquid water, originally at 25 ◦ C. What is the final temperature of

    asked by Sam
  24. Chemistry

    Zinc reacts with hydrochloric acid according to the reaction equation: Zn(s)+2HCl(aq)->ZnCl2(aq)+H2(g) How many milliliters of 4.50M HCl1(aq) are required to react with 8.25g of an ore containing 30.0% Zn(s) by mass?

    asked by Anna
  25. calculating & reporting healthcare statistics

    an employee currently earning $10.85 per hour has been awarded a 3.5 percent merit raise. What will the employee's hourly salary be with this increase?

    asked by tiff
  26. FREE BODY DIAGRAM calculus

    A car is traveling north towards an intersection at 60mph at the same time a truck is headed east toward the same intersection at 45mph. Find the rate of change of the distance between the car and truck when the car is 3 miles south of the intersection and

    asked by erica
  27. physics

    Sue and Jenny kick a soccer ball at exactly the same time. Sue’s foot exerts a force of 52.7 N to the north. Jenny’s foot exerts a force of 91.8 N to the east. a) What is the magnitude of the resultant force on the ball? b) What is the direction of the

    asked by jane
  28. Chemistry

    Helium-oxygen mixtures are used by divers to avoid the bends and are used in medicine to treat some respiratory ailments. What percent (by moles) of is present in a helium-oxygen mixture having a density of 0.498 at 25 and 721 ?

    asked by Ayesha
  29. physics

    A baseball leaves a pitcher's hand horizontally at a speed of 115 km/h. The distance to the batter is 18.3 m. (Ignore the effect of air resistance.) (a) How long does the ball take to travel the first half of that distance? (b) The second half? (c) How far

    asked by tatiana
  30. Maths

    There are 175 pupils in a hall. 40% of them are boys. 25 girls enter the hall. What percentage of the pupils in the hall now are boys?

    asked by Student56
  31. physics

    A ball rolls horizontally off a 3.2 m high table and lands 2.2 m from the end of the table. What is the horizontal velocity of the ball when it leaves the table?

    asked by Sadie
  32. Physics

    A truck is stopped at a stoplight. When the light turns green, the truck accelerates at 2.0 m/s2. At the same instant, a car passes the truck going 13 m/s. Where and when does the truck catch up with the car? _________m (from the intersection)

    asked by J
  33. Chemistry

    1. How many moles of Al(CN)3 are in 199 g of the compound? 2. 96.0 mol of P4O10 contains how many moles of P? 3. If 4.71 moles of C5H12 reacts with excess O2, how many moles of CO2 will be produced in the following combustion reaction? C5H12+8O2 ->

    asked by Anonymous
  34. chemistry

    A 2.33-g sample of a mixture of CaCl2 and Ca(NO3)2 is treated with excess AgNO3(aq). The precipitate is filtered off, dried and weighed. The dried precipitate weighs 3.9 g. What is the percentage by mass of CaCl2 in the original mixture?

    asked by Kevin
  35. Chemistry

    The standard enthalpy of formation of Mn2O3 is −962.3 kJ/mol. How much heat energy is liberated when 4.7 grams of manganese are oxidized by oxygen gas to Mn2O3 at standard state conditions? Answer in units of kJ

    asked by Sam
  36. precalc

    what is the minimum degree of a polynomial. How do I find that and how do I find the maximum nuber of turnin points. I know it has to do with n-1 but Idont know how

    asked by Rebekah
  37. Chemistry 103

    To what volume should you dilute 50ml of a 13M stock HNO3 solution to obtain a 0.131M HNO3 solution?

    asked by YeJi
  38. Analytical chemistry

    what is the mass (in milligrams) of solute in 26.0mL of 0.25M sucrose (342g/mol)?

    asked by engr
  39. Physics

    A car is traveling at 42.0 km/h on a flat highway. (a) If the coefficient of friction between road and tires on a rainy day is 0.100, what is the minimum distance in which the car will stop? m (b) What is the stopping distance when the surface is dry and

    asked by Kali
  40. science-physics

    A swimmer, capable of swimming at a speed of 1.97 m/s in still water (i.e., the swimmer can swim with a speed of 1.97 m/s relative to the water), starts to swim directly across a 2.77-km-wide river. However, the current is 1.13 m/s, and it carries the

    asked by pd
  41. Chemistry

    2KClO3 ----> 2KCl + 3O2 Calculate the number of grams of KClO3 decomposed given an initial sample mass of 2.16g and a residue mass of 1.71g?

    asked by Anonymous
  42. QNT/351

    The names of the positions in a corporation, such as chief operating officer or controller, are examples of what level of measurement?

    asked by JAZE
  43. Statistic

    Mamma Temte bakes six pies a day that cost $2 each to produce. On 15% of the days, she sells only two pies. On 27% of the days, she sells 4 pies, and on the remaining 58% of the days, she sells all six pies. If Mamma Temte sells her pies for $4 each, what

    asked by Anonymous
  44. Algebra

    Anne has 20 coins in her pocket consisting of nickels and dimes only. The total value of the coins is $1.45. How many nickels and how many dimes does she have? (Let x represent the number of nickels and y represent the number of dimes.)

    asked by Anonymous
  45. PoE

    Turner’s treadmill starts with a velocity of −1.9 m/s and speeds up at regular intervals during a half-hour workout.After 36 min, the treadmill has a velocity of −7.6 m/s. What is the average acceleration of the treadmill during this period? Answer

    asked by Sonia
  46. Calculus 3

    A medieval city has the shape of a square and is protected by walls with length 550 m and height 16 m. You are the commander of an attacking army and the closest you can get to the wall is 100 m. Your plan is to set fire to the city by catapulting heated

    asked by Jerry
  47. physics

    during a water show the dolphin made a vertical jump of 2.5 m. Determine: a. The initial velocity they need to make that jump. b. the time it takes the dolphin to reach the maximum height. The total time the dolphin remains in the air.

    asked by daniela
  48. Chem II/College

    Using the Clausius Clapeyron equation determine the vapor pressure of water at 50.0 degrees C. The molar heat of vaporization of water is 40.7 kJ/mol. How do you solve this?

    asked by Bianca
  49. intro chem

    how much HCl is needed to dissolve a 2.5grams iron bar on a padlock

    asked by Amy Tillis
  50. Calculus...plz help!!

    find dy/dx of xsiny-ycosx=1

    asked by Liz
  51. Maths

    20% of the books in a library were fiction books while the rest were non-fiction books. When 30% of the fiction books and 15% of the non-fiction books were borrowed, there were 1312 books left in the library. How many books were borrowed? (Please show me

    asked by Student56
  52. Economics

    If Jane can produce 3 pairs of shoes hourly, while Bob can produce 2, then one can infer that the __________ advantage belongs to __________.  A. absolute; Jane B. comparative; Jane C. comparative; Bob D. comparative and absolute; Jane I think it's D

    asked by Blaze
  53. Physics

    A car accelerates for 5 seconds at 2.1 m/s^2. If the car initially had a speed of 10 m/s, what is the new speed?

    asked by Tori
  54. science

    Q10 A hunter aims his gun and fires a bullet directly at a monkey. At the instant the bullet is fired, the monkey drops. The minimum speed for the bullet to hit monkey is

    asked by anmol
  55. writing (persuasive essay)

    Hi. I'm in 10th grade and our teacher assigned us a persuasive essay to write in class over a topic that we debated about for the last two weeks. Every team had a different topics (mine was school should start from 11 am. to 5 pm), but now we're going to

    asked by Bill
  56. Physics

    Betty Bodycheck (mB = 60.0 kg, vB = 22.0 km/h in the positive x-direction) and Sally Slasher (mS = 46.3 kg, vS = 28.0 km/h in the positive y-direction) are both racing to get to a hockey puck. Immediately after the collision, Betty is heading in a

    asked by raven
  57. Physics

    A 1,200-kg car is pulling a 305-kg trailer. Together, the car and trailer have an acceleration of 2.00 m/s2 in the positive x-direction. Neglecting frictional forces on the trailer, determine the following. (Indicate the direction with the sign of your

    asked by Crown
  58. Physics

    A ball is dropped from the top of a 49.0 -high cliff. At the same time, a carefully aimed stone is thrown straight up from the bottom of the cliff with a speed of 20.0 . The stone and ball collide part way up.

    asked by Yan
  59. Chemistry

    Which of the following is a negative ion? Na+1,Na,O-2,O? All of them?

    asked by Jennifer
  60. Physics

    A bullet is fired straight up from a gun with a muzzle velocity of 148 m/s. Neglecting air resistance, what will be its displacement after 6.3 s? The acceleration of gravity is 9.8 m/s2 .

    asked by Sophie
  61. National Junior Honor Society - HELP!

    Since I'm in the NJHS, last Wednesday was my first meeting. We discuss the expectations, blah blah blah. Then we also discuss leadership positions. Like President, Vice President, Secretary, Reporter, Treasurer, and Committee Chairpersons. In the packet is

    asked by Laruen
  62. Physics

    Consider the figure below. (Let w1 = 150 N and w2 = 38.0 N.) (a) What is the minimum force of friction required to hold the system of the figure in equilibrium? N (b) What coefficient of static friction between the 150-N block and the table ensures

    asked by Kali
  63. Analytical Chemistry

    Consider the titrations of 24mL of 0.050M HClO4 with 0.100 M KOH. Find the pH at the following volumes of KOH; Vb: 0.1, 5, 10, 12.40, 12.50, 12.60, 13 mL

    asked by Jocelyn
  64. physics

    A cyclist is coasting at a steady speed of 17 but enters a muddy stretch where the effective coefficient of friction is 0.60. a)Will the cyclist emerge from the muddy stretch without having to pedal if the mud lasts for 23? b)What will be the speed upon

    asked by Anonymous
  65. Calculus - free body diagram

    A water tank has the shape of an inverted right circular cone whose base radius is equal to half its height. Water is being pumped in at 2 cubic meters per second. How fast is the water rising when the water is 3 meters deep?

    asked by Lizzy
  66. science- please check my work.

    Aspirin (C9H8O4) is produced from salicylic acid (C7H6O3), and acetic anhydride (C4H6O3): C7H6O3 + C4H6O3 ¨ C9H8O4 + HC2H3O2 How much salicylic acid is required to produce 2.0 102 kg of aspirin, assuming that all of the salicylic acid is converted to

    asked by rebekah
  67. calculus

    grain is being poured through a chute at rate of 8 ft^3/min and forms a conical pile whose radius of the bottom is always 1/2 the height of pile. How fast is circumference increasing when the pile is 10 feet high?

    asked by Liz
  68. Analytical Chemistry

    Consider the titrations of 24mL of 0.050M HClO4 with 0.100 M KOH. Find the pH at the following volumes of KOH; Vb: 0.1, 5, 10, 12.40, 12.50, 12.60, 13

    asked by Jocelyn
  69. Finance

    (Bond valuation) A $1,000 face value bond has a remaining maturity of 10 years and a required return of 9%. "The bond's coupon rate is 7.4%. What is the fair value of this bond?

    asked by Kim
  70. Computer (Programming with Python)

    Problem 1: Multiplication Drill Computers can perform calculations extremely quickly and accurately, but it's often handy to calculate with the computers we carry around inside our heads. Write a program to drill you in multiplication tables. Your program

    asked by Jaizzer
  71. Math 8 - help!!!

    Kylie needs to cut 6 pieces of yarn that are each 2/3 foot long. How much yarn does Kylie need? 2/3 x 6 right?

    asked by Laruen
  72. Maths

    3 boys, Aaron, Benny and Charles, share a sum of money. Aaron receives 40% of the sum of money. Benny receives 3 times as much as Charles and $29 more than Aaron. a.) What percentage of the sum of money does Charles get? b.) What is the total sum of money

    asked by Student56
  73. Physics URGENT!!!

    A 85.0 kg base runner begins his slide into second base when he is moving at a speed of 2.10 m/s. The coefficient of friction between his clothes and Earth is 0.570. He slides so that his speed is zero just as he reaches the base. (a) How much mechanical

    asked by Anonymous
  74. chemistry

    Predict the boiling point of the following compound using Trouton's Rule: Heat of vaporization/Tb= 80 J/K Carbon tetrachloride (CCl4) = ?? degrees Celsius

    asked by Brunette
  75. Physics HELP!

    A 85.0 kg base runner begins his slide into second base when he is moving at a speed of 2.10 m/s. The coefficient of friction between his clothes and Earth is 0.570. He slides so that his speed is zero just as he reaches the base. (a) How much mechanical

    asked by Anonymous
  76. math

    an altitude of triangle is 5/3rd of the length of its corresponding base if their altitude be increased by 4cm and the base is decreased by 2cm, the area of the triangles remain the same. find the base and altitude of triangle ?????

    asked by TUHITUHI
  77. chem

    Aspirin (C9H8O4) is produced from salicylic acid (C7H6O3), and acetic anhydride (C4H6O3): C7H6O3 + C4H6O3 ¨ C9H8O4 + HC2H3O2 . (c) What is the theoretical yield of aspirin if 189 kg of salicylic acid is allowed to react with 128 kg of acetic anhydride?

    asked by rebekah
  78. Chemistry

    Given the standard heats of reaction Reaction ∆H0 M(s) + 2 X2(g) → MX4(g) −123.7 kJ/mol X2(g) → 2 X(g) +297.3 kJ/mol M(g) → M(s) −25.1 kJ/mol calculate the average bond energy for a single M X bond. Answer in units of kJ/mol

    asked by Austin
  79. physics

    A pelican flying along a horizontal path drops a fish from a height of 5.1 m. The fish travels 6.1 m horizontally before it hits the water below. What was the pelican’s initial speed? The acceleration of gravity is 9.81 m/s2 . Answer in units of m/s

    asked by kaleb
  80. physics

    A rock is dropped from a tree of height 25 m into a lake (depth 5.0 m) below. After entering the water, the rock then fl oats gently down through the water at a speed of 1.5 m/s to the bottom of the lake. What is the total elapsed time?

    asked by bee-z
  81. math

    • 9 different crusts • With or without cheese • 4 different sauces • 8 different meat toppings • 17 different non-meat toppings Obviously you can have only 1 crust, 1 cheese, and 1 sauce on a pizza. However, you can have anything from 0 to all 8

    asked by Jim
  82. Chemistry

    World energy supplies are often measured in the unit of quadrillion British thermal units (10^12 btu), generally called a "quad." In 2015, world energy consumption is projected to be 5.81*10^17kJ. Current annual energy consumption in the United States is

    asked by M
  83. math

    An open topped box can be created by cutting congruent squares from each of the 4 corners of a piece of cardboard that has dimensions of 20cm by 30cm and folding up the sides. Determine the dimensions of the squares that must be cut to create a box with a

    asked by Melissa
  84. Chemistry

    World energy supplies are often measured in the unit of quadrillion British thermal units (10^12 btu), generally called a "quad." In 2015, world energy consumption is projected to be 5.81*10^17kJ. Current annual energy consumption in the United States is

    asked by M
  85. Physics

    A friend’s car has run out of gas and four of you are pushing the car to the gas station at a constant speed of 4.5 km/h. If two of you are pushing with a force of 300 N and the other two are pushing with a force of 425 N, what is the force of friction

    asked by RajO5
  86. Chemistry

    One mole of carbon (12.0 g) in the form of crystalline graphite is burned at 25 ◦ C and 1.000 atm pressure to form CO2(g). All of the heat produced is used to heat a 4560 g bath of liquid water, originally at 25 ◦ C. What is the final temperature of

    asked by Austin
  87. Maths

    Sophia's monthly salary is $2300. She gives $500 to her parents and saves 30% of the remaining money. She spends the rest. How much does she spent?

    asked by Student56
  88. physics

    on a cool night with no wind, people facing a campfire feel a breeze on their backs explain

    asked by Meenakshi
  89. Physics- PLEASE HELP

    A 2300. kg car starts from rest and accelerates uniformly to 24.0 m/s in 24.0 s. Assume that air resistance remains constant at 510 N during this time. Find (a) the net force on the car b) the average power developed by the engine? c) the instantaneous

    asked by Anonymous
  90. chemistry

    Given the standard heats of reaction Reaction ∆H0 M(s) + 2 X2(g) → MX4(g) −123.7 kJ/mol X2(g) → 2 X(g) +297.3 kJ/mol M(g) → M(s) −25.1 kJ/mol calculate the average bond energy for a single M X bond. Answer in units of kJ/mol

    asked by dave
  91. Business Math

    13. Joyce took out a loan for $21,900 at 12 percent on March 18, 2007, which will be due on January 9, 2008. Using ordinary interest, Joyce will pay back on Jan. 9 a total amount: (Points : 1)

    asked by Anonymous
  92. chemistry

    calculate the mass of sodium hydroxide needed to prepare 100 ml of a .10 m solution

    asked by mike
  93. poe

    When Maggie applies the brakes of her car, the car slows uniformly from 15.9 m/s to 0 m/s in 2.43 s. How far ahead of a stop sign must she apply her brakes in order to stop at the sign? Answer in units of m

    asked by Sonia
  94. physics

    An 18-year-old runner can complete a 10.0-km course with an average speed of 4.53 m/s. A 50-year-old runner can cover the same distance with an average speed of 3.91 m/s. How much later (in seconds) should the younger runner start in order to finish the

    asked by Anonymous
  95. Maths Percentage

    2/5 of the children in an art club were girls. 1/4 of the girls and 5/6 of the boys took part in a competition. 12 boys did not take part in the competition. a.) What percentage of the pupils in the art club did not take part in the competition? b.) How

    asked by Unknown Error
  96. Stats

    Construct a scatterplot for the (x, y) values below, and answer the following questions. You do NOT need to submit your scatterplot with your answer; however, show all other work. x y 1 2.5 2 5.0 3 7.5 4 10.0 5 12.5 - What would be the slope of this

    asked by Anonymous
  97. Physics

    Velocity/instantaneous velocity question? In a demonstration a ball falls directly to the ground. Which of the following statements about this event is not correct? (Assume downward is the positive direction.) a)The average velocity during the first half

    asked by Lewis
  98. English

    1. He stayed up late studying last night. 2. He stayed up late while he was studying last night. 3. He stayed up late while he studied last night. (Does #1 mean #2 or #3? Do we have to use 'while' or'when', etc?)

    asked by rfvv
  99. Chemistry

    Given the standard heats of reaction Reaction ∆H0 M(s) + 2 X2(g) → MX4(g) −123.7 kJ/mol X2(g) → 2 X(g) +297.3 kJ/mol M(g) → M(s) −25.1 kJ/mol calculate the average bond energy for a single M- X bond

    asked by Sam
  100. Physics- Elena please help!

    An accelerometer in a control system consists of a 2.42 g object sliding on a horizontal rail. A low-mass spring is connected between the object and a flange at one end of the rail. Grease on the rail makes static friction negligible, but rapidly damps out

    asked by Anonymous
  101. PHYSICS

    At a drag race, a jet car travels 1/4 mile in 5.2 seconds. What is the final speed of the car and its acceleration?

    asked by Anonymous
  102. physics

    A bicycle has wheels with a diameter of 0.630 m. It accelerates uniformly and the rate of rotation of its wheels increases from 197 rpm to 300 rpm in a time of 22.5 s. Find the linear acceleration of the bicycle

    asked by Emily
  103. physics

    A tire placed on a balancing machine in a service station starts from rest and turns through 4.82 revolutions in 1.48 s before reaching its final angular speed. Calculate its angular acceleration

    asked by Emily
  104. fractions 7th grade

    ty's football practice lasted 2 1/2 hours. if 1/4 of the time was spent catching passes, how much time was spent catching passes?

    asked by katniss
  105. math

    the distance between two stations is 300km. two trains start simultaneously from these stations and move towards each other ,the speed of one them is 7k/hr more than the other . if the distance between them after 2hours of their start is 34km ,find the

    asked by TUHITUHI
  106. Maths

    A school has 1800 pupils. 55% of the pupils are girls. 30% of the girls and 70% pf the boys travel by bus. a.) How many girls travel by bus? b.) How many boys travel by bus? c.) What percentage of the pupils travel by bus?

    asked by Student56
  107. physics

    a block of mass m=0.9 kg is connected to a spring of force constant k= 775 N/m on a smooth horizontal surface. plot the potential energy of the spring from x= -5 cm to x= 5 cm. determine the turning points of the block if its speed at x= 0 is 1.2 m/s.

    asked by Mima
  108. chemistry

    A patient with polycythemia vera(excess production of red cells) receives raioactive phosphorus-32. Why would this treatment reduce the production of red blood cells in the bone marrow of the patient?

    asked by Boo Boo
  109. Chemistry

    To what temperature in K must a variable volume container of helium gas be cooled to obtain a final volume of 0.182 L? The initial volume and temperature are 2.34 L and 314 K, respectively. The pressure and number of moles are fixed. You're supposed to us

    asked by Anonymous
  110. social studies

    Type of movement of the plates that created the landform 1. mountanis 2. valleys 3. plains 4. islands 5. deserts 6. plateaus

    asked by gary
  111. math

    The function f(x) = ax^3-x^2+bx-24 has three factors. Two of these factors are x-2 and x+4. Determine the values of a and b, and then determine the other factor

    asked by Melissa
  112. physics

    A student, starting from rest, slides down a water slide. On the way down, a kinetic frictional force (a nonconservative force) acts on her. The student has a mass of 70 kg, and the height of the water slide is 12.2 m. If the kinetic frictional force does

    asked by Anonymous
  113. physics

    the velocity acquired by a body moving with uniform acceleration is 12 m/s2 in 2 secs.and 18 m/s2 in 4 sec. find the initial velocity of the body?

    asked by vinay
  114. statistics

    1)Let X have a normal distribution with mean 6 and standard deviation 3. a) What is the probability that X > 8.7 2)What is the probability that X 1.9 ? I have got so far: P(Z > 0.9) but I do not know where to go from here! Thank You

    asked by rachel
  115. physics

    Consider the Earth and a cloud layer 600 m above the planet to be the plates of a parallel-plate capacitor. (a) If the cloud layer has an area of 2.0 km2 = 2000000 m2, what is the capacitance?

    asked by B
  116. stats

    . Find the mean and standard deviation of the following probability distribution: x 1 2 3 P(x) 0.4 0.25 0.35 Please show all of your work.

    asked by Anonymous
  117. physics

    A 22.4-g bullet is fired from a rifle. It takes 3.37 × 10-3 s for the bullet to travel the length of the barrel, and it exits the barrel with a speed of 740 m/s. Assuming that the acceleration of the bullet is constant, find the average net force exerted

    asked by Anonymous
  118. algebra 2

    i'm trying to solve this system of equations with 3 variables 5a-b+3c=5 2a+7b-2c=5 4a-5b-7c=-65 i tried to make the first equation like a=something so i could substitute it in to the 2nd equation, however i get decimals so it doesnt work how do i do this

    asked by john
  119. Algebra

    A rectangle is 4 inches longer than it is wide. It's perimeter is 28 inches. Write a system of two equations in two variables that describes this information. Then solve the system graphically.

    asked by Anonymous
  120. English

    Which of the following sentences is without any surface errors? a. Its up to Georgia and I who drives the car, whether Celine likes it or not. b. I reluctantly gave the hamster to my cousin because I was afraid Teddy, my cat, would attack it. c. The town

    asked by chantel
  121. Chemistry

    What volume of a 0.164 M potassium hydroxide solution is needed to exactly neutralize 0.680 grams of KHP ?

    asked by Kele
  122. Chemistry

    In a certain mixture, one compound may be decomposed by heating, releasing 0.78 gram of oxygen. It is calculated that the oxygen makes up 21.5% of the compound. If the total mixture has a mass of 8 grams, what percentage of the mixture is the original

    asked by Anonymous
  123. physics

    A dog runs 150{\rm m} away from its master in a straight line in 8.4{\rm s} , and then runs halfway back in one-third the time.Calculate its average speed,average velocity?

    asked by tony
  124. math

    Explain why there is no number that can replace n to make the equation /n/ = -3 true.

    asked by Paula
  125. physics

    A train at a constant 68.0 km/h moves east for 41 min, then in a direction 65.0° east of due north for 22.0 min, and then west for 60.0 min. What are the (a) magnitude (in km/h) and (b) angle (relative to north, with east of north positive and west of

    asked by tatiana
  126. Chemistry

    HC8H4O4K + NaOH = H2O + H4C8O4KNa I'm given the volume of NaOH in mL (ex: 9.11 mL), and I have to convert it to moles. How can I do that conversion? Please help by explaining if you can, I've had trouble with this problem for the whole week..

    asked by Karen
  127. Math

    Suppose a triangular silk scarf has both of its shortest sides 14 inches long. If the angle between these sides is 110º, what is the area of the scarf? Round your answer to the nearest tenth of a square inch.

    asked by karina602
  128. Math 8 = help!!!!!!!!!!

    Gina brought a magazine subcription. The magazine company charged $15.75 for the subcription and $2.15 for each issue. If Gina paid $45.85, how many issues did she receive? $45.85 - 15/ 75????? I'd been having a bit trouble with this question so this is

    asked by Laruen
  129. Statistics

    . In testing a new drug, researchers found that 20% of all patients using it will have a mild side effect. A random sample of 15 patients using the drug is selected. Find the probability that: (A) exactly three will have this mild side effect (B) at least

    asked by mom
  130. Chemistry

    What is wrong with this ionic equation and what is the correct way to write it? Cl2(aq)+ 2K+(aq)+2Br(aq)->Br2(aq)+ K+(aq)+ 2Cl-(aq)

    asked by Barb
  131. Computer studies

    Draw a flowchart for a program that will accepts 30 intergers and print the number of positive and negatives numbers and the sum of the positive number

    asked by Maria
  132. Chemistry

    making 2 moles of No in a reaction requires 180KJ of energy. How much No will be made if this same reaction absorbel 950KJ OF ENERGY

    asked by Janice Madeux
  133. Physics

    A 85.0 kg base runner begins his slide into second base when he is moving at a speed of 2.10 m/s. The coefficient of friction between his clothes and Earth is 0.570. He slides so that his speed is zero just as he reaches the base. (a) How much mechanical

    asked by Anonymous
  134. Statistics

    What is the probability that we would obtain two sample means that differ by 1.875, when the SD of the sampling distribution is estimated at .125 when our sample has 8 subjects?

    asked by nina
  135. physics

    How do I find the acceleration on a velocity time graph when the graph has an irregular shape.

    asked by Ann
  136. math

    james is making fruit juice, using fruit cordial and water. the label on the cordial says "to make 1 litre of fruit juice, use 200 ml of cordial and 800 ml of water" james uses 250 ml cordial and 850 ml of water. is james using the correct proportions?

    asked by danielle
  137. Chemistry

    What is the mole fraction of ethanol when 5.00 mL of ethanol are combined with 10.00 mL of water?

    asked by Anonymous
  138. Chemistry

    Suppose 1 gram of Li2CO3 is reacted with in 50.0 mL of 3.00 M HCl. What would be the mass of CO2 liberated in the reaction? After the reaction, how many moles of HCl are left over?

    asked by Anonymous
  139. pre calculus

    Algebraically solve the system of equations using any method you wish 3x-10y+z=5 -4x+9y-z=-6 -13y+z=2

    asked by Natasha
  140. Chem

    Balance the following redox reactions in acidic solution by the half-reaction method Br–(aq) + I–(aq) + HClO(aq) = Br2(l) + IO3 + Cl–(aq)

    asked by James
  141. physics

    A train at a constant 68.0 km/h moves east for 41 min, then in a direction 65.0° east of due north for 22.0 min, and then west for 60.0 min. What are the (a) magnitude (in km/h) and (b) angle (relative to north, with east of north positive and west of

    asked by tatiana
  142. physics

    an object 12 kg of mass slides over a surface with horizontal force of 75 N. The friction force is of 17 N. Determine the acceleration of the object.

    asked by daniela
  143. physics

    Betty Bodycheck (mB = 60.0 kg, vB = 22.0 km/h in the positive x-direction) and Sally Slasher (mS = 46.3 kg, vS = 28.0 km/h in the positive y-direction) are both racing to get to a hockey puck. Immediately after the collision, Betty is heading in a

    asked by raven
  144. algebra

    10y^3+y^2-21y

    asked by Kong
  145. English

    1. The Beatles were not happy at all. 2. The Beatles was not happy at all. (Which one is grammatical?)

    asked by rfvv
  146. Chemistry

    Consider a saturated solution of calcium fluoride in 0.086 M potassium nitrate. Complete the following tasks, and then answer the question. a) Write the chemical equation corresponding to Ksp. b) Write the defining expression for the thermodynamic

    asked by Ashley
  147. Maths Percentage

    DRICSIN 3G MOBILE PHONE: $980 NOW ENJOY 10% DISCOUNT!

    asked by Unknown Error.
  148. statistics

    . In testing a new drug, researchers found that 20% of all patients using it will have a mild side effect. A random sample of 15 patients using the drug is selected. Find the probability that: (A) exactly three will have this mild side effect (B) at least

    asked by mom
  149. Anthropology

    One of the great differences between human cultural behavior and that of monkeys and apes is that: (Points : 1) a great deal of human culture is learned through language. humans learn their culture through mimicking their parents. humans do not have

    asked by Marsha
  150. chemistry

    Place charges and electron dots as needed on each ion. As Se Br K Ca Ga. I answered: As3+ Se2- Br- K+ Ca2+ Ga2+

    asked by joane
  151. Physics

    An object is observed for a 5 second interval. During this time, the objects velocity increases from 2 m/s to a final velocity and the object travels 75 m. The acceleration of the object is constant. Given this information, which of the following

    asked by Lewis
  152. math

    name a possible set of scores for 15 students that would result in an average of 66%

    asked by angela
  153. math

    Suppose that a picture is 8 inches by 10 inches (width by height). You want to enlarge it so it is 20 inches wide. How tall will it be?

    asked by beatrice
  154. check my precalc

    #1. Make up a polynomial that has the following characteristics: crosses the x axis at 1 and 4, touches the x axis at 0 ad 2. and is above the xaxis between 0 and 2. I did (x+1)(x-4)(x^2)(x-2)^2 #2. its an illustration but one of the queestino says what is

    asked by Rebekah
  155. english

    I need help understanding simple subjects and simple predicates. The sentence is: What is keeping them? I'm confused about which is the simple subject and simple predicate. Thank you

    asked by gracie
  156. Physics

    1. What is absolute uncertainty? (+one example) 2. What is relative uncertainty? (+one example)

    asked by Andy
  157. physics

    A plane flies 475 km east from city A to city B in 50.0 min and then 986 km south from city B to city C in 1.00 h. For the total trip, what are the (a) magnitude (in km) and (b) direction of the plane's displacement, the (c) magnitude (in km/h) and (d)

    asked by tatiana
  158. chemistry

    calculate the mass of sodium hydroxide needed to prepare 100 ml of a .10 m solution

    asked by mike
  159. physics

    A car starts from rest and travels for 5.9 s with a uniform acceleration of +3.0 m/s2. The driver then applies the brakes, causing a uniform deceleration of 1.3 m/s2. If the brakes are applied for 2.1 s, how fast is the car going at the end of the braking

    asked by Sonia
  160. algebra

    10y^3+y^2-21y

    asked by Kong
  161. chemistry

    How do I balance the following equation by the half-reaction method (it takes place in basic solution)? Fe(OH)2(s) + O2(g) = Fe(OH)3(s) the answer is 4Fe(OH)2(s) + 2H20(l) + O2(g) = 4Fe(OH)3(s) but how do I work it out?

    asked by Lydia
  162. geometry

    what is the slantheight of the square pyramid that can be curved out from a wooden cube of side 12cm?what is the lateral surface area?

    asked by asha
  163. Chemistry (edit)

    What is wrong with this ionic equation and what is the correct way to write it? Cl2(aq)+ 2K+(aq)+2Br(aq)->Br2(aq)+ 2K+(aq)+ 2Cl-(aq)

    asked by Barb
  164. mechanics

    a fly wheel of mass 66kg and 2m radius makes 55rpm.assuming mass is concentrated at the rim.calculate the angular velocity and moment of inertia

    asked by Anonymous
  165. english

    what can be considered as leadership and if it like clubs and job. what else it could be?

    asked by noor
  166. math

    when 3a squared minus 7a plus 6 is subtracted from 4 a squared minus 3a plus 4 is? please help

    asked by Kiki
  167. english

    The following sentence is missing punctuation: “The crowd upset by the delay began to chant loudly for the band to appear.” Explain where the error has occurred in this sentence and how it can be fixed

    asked by cathy
  168. Physics

    you are driving on a long straight road. your friend sitting next to you is sleeping soundly. he wakes up as soon as you exit the highway to stop for gas. explain what it was that caused your friend to wake up.

    asked by ugh
  169. Public Administration

    Explain the budget system model, its consistency with democratic theory, and the importance of data measures.

    asked by Lisa
  170. Chem

    From previous experiments, you have the following information. N2(g)+O2(g)2NO(g) Kc=2.3*10^-19 2NO(g)+O2(g)2NO2(g) Kc=3*10^6 using that information, how many moles of NO2(g) will be made if you started with 1 moles of N2(g) and 2 moles of O2 (g)?

    asked by Allyx32
  171. calculus PLZ HELP!!

    find the equation for the line tangent to the curve at the given point. (x^2)(y^2)-2xy+x=1 at (2, 1/2)

    asked by Liz
  172. Math

    Insert a set of parentheses in this expression so that ii is equivalent to 3y+10: 4y-3x-y+2x-8+5x+2

    asked by John
  173. calculus

    find the derivative of y=2sqrt(x)-(1/x)

    asked by Lizzy
  174. NSCI 110

    a car that was initially moving at 25 m/s is accerlerated at 4.0 m/s^2 for 5.0 s. the final speed of the car is?

    asked by ebony
  175. Physics

    Whats the difference between uniform acceleration graph and a constant acceleration graph? Both graphs look the same and I can differentiate them...

    asked by Lewis
  176. physics

    An 8.82g bullet is fired into a 235g block that is initially at rest at the edge of a table of h = 1.05 m height (see the figure below). The bullet remains in the block, and after the impact the block lands d = 2.16 m from the bottom of the table.

    asked by Emily
  177. Physics

    A 1830-kg car is traveling with a speed of 19.8 m/s. What is the magnitude of the horizontal net force that is required to bring the car to a halt in a distance of 63.1 m? Not sure about the equation to use for this queation.

    asked by James
  178. Chemistry

    Please help: A silicon wafer has a thickness of 0.084cm, a diameter of 10.16 cm, and a mass of 15.87 g. what is the density of silicon based on these measurement? I know that D=mass/volume. Is this equation right: 15.87g/(0.084cm*10.16cm)? thank you for

    asked by Thy
  179. social studies

    Pookie is listening to music through headphones so that no one else can hear it. When Pookie's sister walks into the room, he says, "Sissy, do you like this song?" even though she cannot hear the music. Pookie's question indicates that he engages in which

    asked by clara
  180. Math

    What is 5% more than $2,000= ——— of $2,000 or ——— × $2,000?please give me an example

    asked by Losa
  181. Math Coll

    Find the coeficient of x^18 y^32 z^25 in (x + y + z)^75? How many monomials appear in the expansion of (x + y + z)^75?

    asked by Genie_math
  182. College Math Probability

    Let 1

    asked by Genie_math
  183. Physics

    I eat a 500 Calorie lunch and go hiking up a mountain afterwards. Assuming that chemical energy is converted to gravitational potential energy with 50% efficiency, approximately how many miles up the mountain can I go before I need my dinner? 0.5 miles 1

    asked by StressedStudent
  184. Math

    What is 71 times 65 in ladder form

    asked by Alexis
  185. Math 8 - HW Qs. Check

    Amy watched television for 2 3/4 hours. Charles watched television for 1/3 of the time Amy did. How long, in minutes did Charles watch television. 2 3/4 - 1/3 right?

    asked by Laruen
  186. Word study slash english

    What are some words with the ay slash igh sound

    asked by Daniel
  187. ciao

    disegno di due segmenti uno il triplo dell'altro

    asked by Anonymous
  188. stats

    How many green elements are required to make this a legitimate probability distribution if there are a total of 50 elements in this sample? x red blue orange brown green P(x) 0.18 0.20 0.32 0.28

    asked by Anonymous
  189. Math 8 - HW. Qs. Check

    12 + v/2 = 17 My Answer - 10 right?????

    asked by Laruen
  190. Science

    Please list breeds of pigs found in the caribbean thank you.

    asked by Juanita
  191. Oral Book Report

    My book is titled The Battle Of The Labyrinth. I have to do a Sentence Outline for this Oral Book Report. But i don't know where to start from to write my sentence outline. Should i go over the book again, or just find important stuff about it? The author

    asked by Losa
  192. chemistry

    I thought about the syntax of the problem and I have surmised that what I thought were two questions was actually one. I'm slow but not dead yet. 75g of tartaric acid in 1 liter is used in a titration. 25mL of tartaric acid solution is titrated against

    asked by What?
  193. QNT/351

    What level of measurement is the number of auto accidents reported in a given month?

    asked by JAZE
  194. CALCULUS help! =)

    find the derivative of f(x)=3x^2-x using the limit definition.

    asked by Liz
  195. CALCULUS help!!!=))

    find dy/dx (-x^2)(y)+2xy=3y^2-7

    asked by Liz
  196. physics

    A hot air balloon descends with an overall velocity of 4.2 m/s at an angle of 36.8⁰ below the horizontal. what is the horizontal velocity of the balloon?

    asked by Sam
  197. maths

    if the size of each exterior angle of a regular polygon is 90 degrees how many sides does it have?

    asked by Lauren
  198. Math

    What is the derivative of ln(xe^5x)?

    asked by Anonymous
  199. High School Math

    Use >,< or = to complete the statement. |-10| |11| A. > B. = C.< I chose C is that correct I get confused because they are enclosed

    asked by Brian
  200. calculus please help me

    find derivative of: f(x)=e^2 I know that b/c e is a constant the answer is 0, but how do I show that in my work?

    asked by erica
  201. world history

    the San hunters of southern africa weren't overwhelmed during the nineteenth century because they a. were protected by a treaty b. were moved to reservations where they could be protected c. live in a harsh encironment d. managed to effectively fight off

    asked by april
  202. Physics

    Whats the difference between uniform acceleration graph and a constant acceleration graph? Both graphs look the same and I can differentiate them...

    asked by Lewis
  203. Math

    What is the derivative of sin(x)(cos(x)-2)?

    asked by Anonymous
  204. calculus PLEASE help !

    find the equation for the line tangent to the curve at the given point. y=((x^2)+1)/((x^2)-1) at (2, 5/3)

    asked by erica
  205. FISICA

    10. Una partícula se encuentra en una circunferencia de 7.5 m de radio con una velocidad constante de 3 m/s. En cierto instante, frena con una aceleración constante de 2 m/s2 hasta detenerse. a. ¿Cuál es la aceleración de la partícula antes de

    asked by odd
  206. calculus =)

    find the derivative of g(x)=sin(cos(sin(pi*x)))

    asked by Liz
  207. english

    what can be considered as leadership and if it like clubs and job. what else it could be?

    asked by noor
  208. AP Human Geography

    Identify the relationships between religion and government/political power in some regions of the world. I have a huge test tommorow! Please answer this, i love ya'll!

    asked by andria
  209. lit- sentence rewording

    I'm writing an essay and I keep using opportunities, accusations, and believe a lot. Are there any other words similar to this one?

    asked by greeny
  210. Chem

    To what temperature in K must a variable volume container of helium gas be cooled to obtain a final volume of 0.182 L? The initial volume and temperature are 2.34 L and 314 K, respectively. The pressure and number of moles are fixed. You're supposed to us

    asked by Anonymous
  211. math

    please help me if x over 4 minus a over b is equal to 0 b is not equal to 0, then x equals what? thanks

    asked by Kiki
  212. physics

    plz tell me how does wireless communication work in a jist

    asked by nanbala
  213. Health and Nutrition

    What are some benefits of taking dietary supplements

    asked by toya
  214. physics

    A 30lb sand bag falls off a hot air balloon floating stationary 5000ft above the ground what is the speed of the bag at the moment it hits the ground?

    asked by Jr
  215. Social science

    Social conflict, empowerment theory and feminist theory. How are the theories similar? How are the theories different? What are the implications for interventions and community development?

    asked by KeKe
  216. physics

    a fly wheel of mass 66kg and 2m radius makes 55rpm.assuming mass is concentrated at the rim.calculate the angular velocity and moment of interia

    asked by Anonymous
  217. chemistry... HELPP

    Place charges and electron dots as needed on each ion. As Se Br K Ca Ga. I answered: As3+ Se2- Br- K+ Ca2+ Ga2+ but i got it wrong so please helppp!!!

    asked by joane
  218. math

    . What’s the better deal: 1 lb. of Boars Head ham for $7.99 or ¾ lb of Boars Head ham for $5.49? Explain/show why.

    asked by beatrice
  219. math

    how do u reduce 8 gal 9pt

    asked by becca
  220. Math

    What is the derivative of (x^2+4x+5)/(x^3-2x)?

    asked by Anonymous
  221. CALCULUS help!!!=))

    find dy/dx -x^2y+2xy=3y^2-7

    asked by Liz
  222. Math

    What is the derivative of ((e^pie/3)(cosx))? Is it pie/3e^pie/3 times cosx - e^pie/3 times sinx?

    asked by Anonymous
  223. Math

    Is the derivative of (squarerootof x)/(3x+1) : 3x+1-3squarerootofx/(2squarerootofx)(3x+1)^2

    asked by Anonymous
  224. ALG 2!!!

    WRITE AN EQUATION IN SLOPE-INTERCEPT FORM FOR THE LINE DESCRIBED. SLOPE 3,Y-INTERCEPT AT 4

    asked by tyneisha
  225. logic

    A conditional sentence with a false antecedent is always (Points : 1)

    asked by Anonymous
  226. Communication

    is it possible to adapt listening styles to circumstances? give an example

    asked by Christopher
  227. math

    simplify 5+1/3*1/3*1/3-(1/9+1/9)

    asked by Anonymous
  228. math

    2 over x minus 3 is equal to 26 over x what is x? can u please help me

    asked by Kiki
  229. Health and Nutrition

    What are the government regulations surrounding dietary supplements?

    asked by toya
  230. math

    if x over 4 minus a over b is equal to 0 b is not equal to 0, then x equals what? thanks

    asked by Kiki
  231. math

    ken ken puzzle 6* 50* 15+ 2/ 36* 20+ 1 2/ 3/ 9+ 7 2 21* 4* 15* 21+ 3/ 12+ 30+ 6 4* 48* 6 27+ 15* 7 14+ 28+ 14+ 7+ 20* 1 9* 2/ 35* 4/

    asked by rachel
  232. math

    please help me if x over 4 minus a over b is equal to 0 b is not equal to 0, then x equals what? thanks

    asked by Kiki