Newest questions and responses by karen
  1. Ap Calculus

    Find the area of the region bounded by the curves y=x^2-1 and y=cos(x). Give your answer correct to 2 decimal places

    asked on February 13, 2019
  2. Math

    write and solve two subtraction problem that show how many of each animal therw might be. then write the numbersthey are four different kind of animals on the farm there are 19 More cows than sheep there are 19 more ducks than hens there more hens than cow

    asked on January 14, 2019
  3. Calculus

    Given f'(x)=(2-x)(6-x), determine the intervals on which f(x) is increasing or decreasing Options: 1) Decreasing (-∞,2); increasing on (6,∞) 2) Decreasing (2,6); increasing on (-∞,2)U(6,∞) 3) Decreasing (-∞,2)U(6,∞); increasing on (2,6) 4)

    asked on December 26, 2018
  4. Calculus

    A particle moves along the x-axis so that at time "t" its position is given by s(t)=(t+3)(t-1)^3 ,t>0 For what values of "t" is the velocity of the particle increasing? a) 00 d) the velocity is never increasing

    asked on December 26, 2018
  5. Calculus

    Find the absolute maximum value for the function f(x)=x^2 - 3 , on the interval [-4,0) U (0,3]

    asked on December 26, 2018
  6. Calculus

    In the space below, provide the larger of the positive integers that add to 10 and have the largest possible product

    asked on December 26, 2018
  7. Calculus

    If f(x) is a continuous function defined for all real numbers, f(-1)=1, f(-5)=-10, and f(x)=0 for one and only one value of x, then which of the following could be that x value? a) -6 b) -5 c) -4 d) 0

    asked on December 20, 2018
  8. Calculus

    If f is a function such that (f(b) - f(a))/(b-a) =2, then which of the following statements must be true a) f(a) = f(b) =2 b) the slope of the tangent line to the function at x =a is 2 c) The average rate of change of the function on the interval [a,b] is

    asked on December 20, 2018
  9. Calculus

    A gallon rises at the rate of 8 feet per second from a point on the ground 12 feet from an observer. To 2 decimal places in radians per second, find the rate of change of the angle of elevation when the ball on is 9 feet above the ground. Type your answer

    asked on December 19, 2018
  10. Math quadratic equation

    2/x+5 - x/x-5 =1 I multiplied both side by (x+5) (x-5) or by x^2 -25 and I arrive at -x^3+x^2+25x-25 =0 And now I am stuck. Thanks for any help

    asked on November 10, 2018
  11. Calculus

    Which of the ff function cannot be expressed in explicit form of dy/dx 4x+4y=2 xy-y^2=1 ycosx=5 My answer is ycosx=5

    asked on November 5, 2018
  12. Math

    Jerry spent 1/5 of his allowance on a book and 3/8 on a book. He remained with $12.00. Calculate Jerry allowance, the cost of the book and the cost of the pen

    asked on September 27, 2018
  13. Math

    One out of 37 high school ball players play college ball. one out of 22 college players play professional ball. what fraction of high school players play professional ball?

    asked on September 26, 2018
  14. Chemistry

    How much heat is required to convert 9.00 g of water at 100°C into steam at 100°C, if ∆Hvap for water = 40.7 kJ/mol?

    asked on July 28, 2018
  15. Chemistry

    If 4.39 g AlCl3 is dissolved in enough water to make exactly 100.0ml of a solution, what is the molar concentration of the chloride ion?

    asked on March 31, 2018
  16. science

    1. all of the life functions are carried out by cells in a living organisms in order to A. Perform Synthesis B. Maintain Homeostasis C. Keep an Internal steady state D. Both c and d 2. If an -------------------- were digested the product would be

    asked on March 17, 2018
  17. Science-9

    The weight of the nucleus is known as the? atomic mass?

    asked on December 11, 2017
  18. Chemistry

    29.25g of sodium chloride is added to water and undergoes electrolysis according to this equation 2Cl-=Cl2 Calculate the mass of chlorine produced. I am lost with this one !

    asked on December 3, 2017
  19. Chemistry

    Glucose( C6H12O6) is produced by photosynthese. For every kilo of water the plant takes in ,how much glucose can it make ? I done the balanced equation wich is (I think) 6H2O+6CO2 = C6 H12 3O6 After that I get a ratio of 108/372 wich give me a tota of 3444

    asked on December 3, 2017
  20. Math

    please help find the inverse function f-1(x) if f(x)=10^(3x) f(x)=log2(4x) Thanks a lot

    asked on October 15, 2017
  21. Math

    I need help, please find the exact value of 2log3 27+log3 (1/3)-log3 3^1/2 many thanks

    asked on October 10, 2017
  22. anthropology

    2 key differentiators and 2 examples of anthropology compared to history and sociology. I found the definitions of each- Cultural anthropology-study of living people and cultures and they actually live with the people they study Archaeology- a subclass of

    asked on September 26, 2017
  23. Math

    A digital clock shows either 3 or 4 digits at a time. What time do the digits have the greatest sum!

    asked on August 24, 2017
  24. Chemistry

    The radius of a magnesium atom is 160 pm & its mass is 4.04 X 10^-23 g. What is the density of the atom in grams per cubic centimeter? Assume the atom is a sphere with: Volume= (4/3)*pi*r^3

    asked on August 23, 2017
  25. Biochemistry

    What is the condensed structural formula of cyclopropane?

    asked on August 21, 2017
  26. Math

    A Texas oil drilling company has determined that it costs $25,000 to sink a test well. If oil is hit, the revenue for the company will be $500,000. If natural gas is found, the revenue will be $150,000. If the probability of hitting oil is 3% and of

    asked on August 2, 2017
  27. math

    what is the effective interest rate of an 8% 13-week treasury bill? assume it is a $10,00 treasury bill, and round to the nearest hundredth percent

    asked on June 5, 2017
  28. Statistics

    A company makes batteries with an average life span of 300 hours with a standard deviation of 75 hours. Assuming the distribution is approximated by a normal curve fine the probability that the battery will last . Less than 250 hours b. Between 225 and 375

    asked on April 27, 2017
  29. Algebra 2

    E6------E= -0.378eV E5------E= -0.544eV E4------E= -0.850eV E3------E= -1.51eV E2------E= -3.40eV Use the figure shown above to determine how much energy a hydrogen atom with its electron in the E2 energy level must absorb for the electron to be removed

    asked on April 24, 2017
  30. Math

    There is 5 gallons of pineapple juice and I have a six oz glass how many drinks do I get out of the five gallon jar ?

    asked on March 31, 2017
  31. chemistry

    Calculate the concentration of all species in a 0.20 M KF solution.

    asked on March 7, 2017
  32. Math

    What is the approximate circumference if diameter is of 23 feet

    asked on February 28, 2017
  33. Math

    Place parentheses in the expression to make it equal 60? 2×6+6+3×2

    asked on February 16, 2017
  34. Pre-Calculus

    How to solve sin(x/2) = 1 - cos x? I know you would use the half angle identity sin(x/2) = +-(√1 - cos x/2), just don't know what to do from there.

    asked on January 30, 2017
  35. Pre-Calculus

    How to solve sin(x/2) = 1 - cos x? I know you would use the half angle identity sin(x/2) = +-(√1 - cos x/2), just don't know what to do from there.

    asked on January 30, 2017
  36. Math

    when z is divided by 8, the remainder is 5. What is the remainder when 4z is divided by 8. Can you please explain this to me step by step? I'm having difficulty understanding why the answer is 4

    asked on January 26, 2017
  37. Math geometry

    The measure of an angle is twenty more than three times it's supplement. What are the measures of each angle?

    asked on January 24, 2017
  38. Geography

    The distance between station x and y on the map is 7cm. Find the actual ground distance between the two stations if the map scale is 1:100000

    asked on January 15, 2017
  39. Physics

    A table is supported against a wall forming an angle with the vertical. The coefficient of static friction between the table and the floor is (μe). The frictional force of the wall on the board may be neglected. Find an expression for the maximum value

    asked on December 13, 2016
  40. American Government

    Why did the framers insist that federal judges be appointed for a lifetime of service?

    asked on December 12, 2016
  41. Physics

    How long does a car with an acceleration of 2.0 m/s2 take to go from 10 m/s to 30 m/s a. 3 m b. 6 m c. 18 m d. 36 m

    asked on December 8, 2016
  42. Algebra

    The total tickets sales for a highschool basketball game were $2.00. The tickets price for students was $2.25 less than the adult ticket price. The number of adults tickets sold was 230, and the number of students tickets sold was 180. What was the price

    asked on December 7, 2016
  43. Statistics

    A random sample of size n is to be drawn from a population with a mean = 500 and sd = 100. What sample size would be necessary to ensure a standard error of 25? Sample sizes are whole numbers.

    asked on November 15, 2016
  44. algebra

    if Sam invested $10,000 at simple interest, some at 3% and some at 4% and paid $320 , what was the amount invested at each rate?

    asked on November 14, 2016
  45. Pre-Calculus

    The amount of force required to compress a spring is inversely proportional to the distance that it has been compressed. For one certain spring, it takes 5 pounds of force to compress it from its natural length of 18 inches down to 12 inches. How much

    asked on November 14, 2016
  46. Stoichiometry

    Equation to use Al + Cl2 -> AlCl3 You have 8.6 moles of aluminum, how much in moles of chlorine do you need to react completely? Desperate. Trying to teach daughter on the spectrum and I'm stumped on how to start.

    asked on November 13, 2016
  47. Math

    For every 5 highlighters that Agnes buys , she gets 1 free. If Agnes needs 80 highlighters, what is the least number of highlighters she has to buy?

    asked on November 12, 2016
  48. Math

    Aaron and Ben have a total of 976 trading cards. Ben has 7 times as many cards as Aaron. How many cards should Ben give Aaron so that Aaron will have 3 times as many cards as Ben?

    asked on November 12, 2016
  49. Math

    The temperature at 8:00 a.m. was 46°F. By 1:00 p.m. it was 18° warmer. Which equation would help you figure out what temperature it was at 1:00 p.m.?

    asked on November 9, 2016
  50. chemistry

    The amount of lead in drinking water is 0.025 mg/L. Express this concentration in molality. {molar mass of lead is 207.2 g/mol and the density of water is 1.00 g/cm.}

    asked on November 5, 2016
  51. chemistry

    Molarity material = density x 1000 x (%/100) x (1/molar mass material) 1000 indicates?

    asked on November 4, 2016
  52. chemistry

    How many milliliters of concentrated nitric acid, HNO3, 70 % (wt/wt) are required to prepare 1 liter of 0.250 M solution? The molar mass and density of HNO3 are 63.0 g/mol and 1.36 g/cm respectively.

    asked on November 4, 2016
  53. Math

    The price of a home is 177,000. The bank requires a​ 20% down payment and three points at the time of closing. The cost of the home is financed with a​ 30-year fixed-rate mortgage at 10​%.

    asked on October 24, 2016
  54. math

    A bird beats it's wing 24 times per second. How many times will it beat it's wing in one hour

    asked on October 22, 2016
  55. Math

    A total of 120 students attend top view high school.the ratio of teachers to students is 1:30. Whats the answer

    asked on September 22, 2016
  56. Math

    120 students attend top view high school.the ratio of teacher to students is 1:30.

    asked on September 22, 2016
  57. Math

    During summer vacation, Sanjay writes letters and postcards to his friends at home. A letter costs $0.41 to mail and a postcard costs $0.21 to mail. Sanjay writes to 8 friends and spends $2.08. How many letters and postcards he sends.

    asked on September 18, 2016
  58. Math question urgent

    Mrs. Hart, at age 65, can expect to live for 25 years. If she can invest at 8% per annum compounded monthly, how much does she need now to guarantee herself $300 every month for the next 25 years? Present Value = 900(1 - 1.0041666..)^-300)/.0041666... =

    asked on September 17, 2016
  59. Math

    Mrs. Hart, at age 65, can expect to live for 25 years. If she can invest at 8% per annum compounded monthly, how much does she need now to guarantee herself $300 every month for the next 25 years?

    asked on September 16, 2016
  60. math

    Jeremy takes out a 30-year mortgage of 220000 dollars at an annual interest rate of 7 percent compounded monthly, with the first payment due in one month. How much does he owe on the loan immediately after the 87th payment? I have tried 204311.1024, but

    asked on September 16, 2016
  61. Math

    A ship starts at port P, sails 226 deg (T) for a distance of 120 km. 1. How far south of P is it? 2. How far west of P is it?

    asked on September 4, 2016
  62. physics

    you walk 95.0 m at a speed of 1.26 m/s and then run 95.0 m at a speed of 3.61 m/s. what is the average velocity?

    asked on August 21, 2016
  63. World history

    1Which of the following would john locke most favor Republic Oligarchy Theocracy Absolute monarchy 2Whay was james i resistant to working with parliament He believed in the absolute power of kings He did not agree with the policies of the prime minister

    asked on August 10, 2016
  64. Management Science

    For your phone calls, you can either A) buy a prepaid monthly plan, or B) pay as you go. A cost $50 per month and calls are free up to 8hrs. Any extra min for that month will cost you $.25. B has a cost of $.15 per minute. What are the two total cost if

    asked on June 17, 2016
  65. chem II

    calculate the number of moles of solute present in 50.0g of an aqueous solution that is 1.5m NaCl.

    asked on May 2, 2016
  66. MATH

    The Eiffel Tower has a surface area of approximately 76,000 square meters. A restoration company charges $80 per sq yard for re-painting. How muuch will it cost to paint the Eiffel Tower

    asked on May 2, 2016
  67. Accounting 220

    On January 1, 2014, Muoy Machining Co. purchased a compressor and related installation equipment for $72,500. The equipment had a three-year estimated life with a $12,500 salvage value. Straight-line depreciation was used

    asked on April 30, 2016
  68. Math

    Allan gave 5/8 of his money to his son and then gave his daughter 1/2 of the remainder. He kept $150.00 for himself. How much money did Allan have at the beginning? How much money did his son get?

    asked on April 27, 2016
  69. BRCharter Academy

    Explain how the line plot would change if you measure a purple pen that is inches long

    asked on March 3, 2016
  70. Chemistry

    How many millimoles of HCl (aq) are neutralized by 0.35 g of CaCO3 (sol)? mmol

    asked on March 2, 2016
  71. Statistics

    A volunteer ambulance service handles 0 to 5 service calls on any given day. The probability distribution for the number of service calls is as follows: one column has number of service calls (X) those numbers are 0 1 2 3 4 5. The next column Probability P

    asked on February 13, 2016
  72. Chemistry

    Three isotopes of Neon occur naturally: 20Ne (mass = 19.9924 amu) 21Ne (mass = 20.9938 amu) 22Ne (mass = 21.9914 amu) If the percent abundance of 21Ne is 0.2600, what is the percent abundance of 20Ne? How do I set up for these type of problems. I tried

    asked on February 12, 2016
  73. Chemistry

    How do you Find the mass (in g) of Carbon in 2.980 g Carbon dioxide? I saw the question asked before but couldn't find a solution.

    asked on February 12, 2016
  74. math

    Area of a triangle is72cm squared base=12 height=?

    asked on February 11, 2016
  75. chemistry

    A metal tank contains three gases: oxygen, helium, and nitrogen. If the partial pressu of the three gases in the tank are 5 atm of O2, 900 mm Hg of N2, and 1.4 kPa of He what total pressure inside of the tank?

    asked on February 1, 2016

    Find the dimensions of a rectangle with a Perimeter of 100 cm - its width is 2/3 its length.

    asked on January 31, 2016
  77. Chemistry

    How many grams of aluminum sulfate are produced if 15.7 g Al reacts with excess CuSO4?

    asked on January 20, 2016
  78. Check my answers Ms. Sue?

    I posted this in my last question but its not showing up for me.. But i have redone the questions you said were wrong and i was hoping you would check them again 1. How did the southern economy change after the Civil War? Shipped raw materials to northern

    asked on January 19, 2016
  79. World History Check my answers

    Okay so i put a star* by each of my answers.

    asked on January 19, 2016
  80. Chemistry

    A 50.0g sample of copper at 10.0 C is placed in 200.0g H20 at 40.0 C in a calorimeter. Heat flows from the water to the copper until both are at 39.3 C. What is the specific heat of copper? (Csp H20 is 4.18J/g*C.) I don't have any idea how to do this

    asked on January 13, 2016
  81. Math

    Two ships leave port at 4 p.m. One is headed N38°E and is travelling at 11.5 km/h. The other is travelling at 13 km/h, with heading S47°E. How far apart are the two ships at 6 p.m.? i am in grade 11 :), studying ahead of the class :) its 8 pm here, this

    asked on January 3, 2016
  82. math

    Two ships leave port at 4 p.m. One is headed N38°E and is travelling at 11.5 km/h. The other is travelling at 13 km/h, with heading S47°E. How far apart are the two ships at 6 p.m.?

    asked on January 1, 2016
  83. Hunt

    Wyatt and Allyson were asked to solve a percent problem using the number 13 and 38. Wyatt found 13% of 38 and allyson found 38% of 13. Explain why they both got the same answer. Would this work for other numbers as well? Why or why not?

    asked on December 8, 2015
  84. Physics

    A 5000 kg truck rear ends a 2500 kg car. Both vehicles applied brakes at the moment of the impact and began to skid. After the impact, the acceleration of the truck is -2 m/s and the acceleration of the car is -3 m/s. If the car skid for 30 m and the truck

    asked on December 4, 2015
  85. Math

    Part A: Max rented a motorbike at $465 for 5 days. If he rents the same motorbike for a week, he has to pay a total rent of $625. Write an equation in the standard form to represent the total rent (y) that Max has to pay for renting the motorbike for x

    asked on November 25, 2015
  86. science

    A glass bottle has a volume of 1L and weighs 500g. When half filled with oil, it weighs 1750g. What is the density of the oil in the bottle?

    asked on November 22, 2015
  87. chem

    The mystery compound CxHy is completely reacted with O2 to yield 44 gr CO2 and 18gr H2O. What is the empirical formula of CxHy? I got : C1H2 How much O2 in grams was used in this reaction??

    asked on November 3, 2015
  88. chem

    Assume that the atomic diameter of an atom of element X is 2A and that 1.0 x 10(16th) atoms are arranged in a simple 2D square array. What is the length of each side in cm?

    asked on November 3, 2015
  89. chem

    Consider the unbalanced reaction CO + H2O > CH4 + O2. All reactants in the gas phase. Calculate the H per mole of H2O reacted.

    asked on November 3, 2015
  90. chem

    When balancing the following, what is being reduced, what are the reducing agents, and what is the initial and final oxidation states of the reduction agent? Fe3O4(s) + C(s) > CO2 (g) + Fe

    asked on November 3, 2015
  91. chem

    Fe3O4(s) + C(s) > CO2 + Fe Balance the chemical reaction and calculate how many moles of Fe3O4 must be reacted to produce 440 gr CO2 (the > is an arrow)

    asked on November 2, 2015
  92. chem

    2.0 x 10(exp-13) km/0.01=

    asked on November 2, 2015
  93. chem

    Consider the unbalanced reaction CO + H2O > CH4 + O2. All reactants in the gas phase. Calculate H per mole of H2O reacted. (The > is an arrow)

    asked on November 2, 2015
  94. Statistics

    At the end of the Halloween Festival the organizers estimated that a family of participants spent an average $45.00 with a standard deviation of $12.00. What’s the probability that the mean amount spent will be between $20 and $30?

    asked on October 21, 2015
  95. 6th Grade Math

    Caleb sold boxes of candy. Some sold for $2, and some sold for $3. He sold a total of 35 boxes and received $92. How many boxes did he sell for $2?

    asked on October 7, 2015
  96. Distributed Management System

    what is the crow's foot ERD of this problem?

    asked on October 4, 2015
  97. Math

    Ryan's average for 5 arithmetic test was 89. On four of the tests he made 96,86,92, and 80. What did he make on the fifth test?

    asked on October 2, 2015
  98. Math

    A recipe or trail mix calls for 1/4 cups of raisins, 1 1/2 cups of granola, 1/2 cup of mixed nuts, and 1/8 cup of chocolate chips. What fraction of each ingredient is required to make 5 1/2 recipes

    asked on September 24, 2015
  99. Physics

    The tortoise and the hare are in a race of 1000m distance. The tortoise travels the entire race at a speed of 2.0 m/s while the rabbit runs the first 200 m @ 2.0 m/s. Then he stops to take nap for 1.3 hrs and awakens to finish the last 800m with an average

    asked on September 22, 2015
  100. geometry

    M is the midpoint of JK. find the coordinates of K. 1. J (-8,4) M (-1,1) 2. J (9,-5) M (5, -2) 3. J (0,11) M (-3,2)

    asked on September 21, 2015


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