# Barbara

Popular questions and responses by Barbara
1. ## Chemistry

Bromine is a reddish-brown liquid. Calculate its density (g/mL) if 586g of the substance occupies 188 mL.

2. ## math

A medical researcher wanted to determine the effect of pH (a measure of alkalinity or acidity, with pure water having a pH of 7) on the growth of a bacteria culture. The table below gives the measurements of different cultures, in thousands of bacteria,

3. ## algebra

Find the distance, d,across the river. Assume that the ratio of d to 90ft is the same as the ratio of 100ft to 50ft

4. ## statistics

Assume that the mean hourly cost to operate a commercial airplane follows the normal distribution with a mean of \$2,225 per hour and a standard deviation of \$220. What is the operating cost for the lowest 5 percent of the airplanes?

5. ## Physical Science

Why does a glass filled with a cold beverage seem to sweat? a. saturation always results in sweat on wet object. b. the cold glass adjacent air to saturation, which is followed by condensation of water vapor. c. when cold, water molecules can move through

6. ## Statistics

The closing price of Schnur Sporting Goods, Inc., common stock is uniformly distributed between \$17 and 35 per share. What is the probability that the stock price will be: More than \$31? Less than or equal to \$23?

7. ## algebra

A triangle has a perimeter of 112 centimeters, each of the two longer sides of the triangle is three times as long as the shortest side. Find the length of each side of the triangle

8. ## science

If a 0.5 L container of juice contains 15 g of sugar, what's the concentration of sugar? A. 30 g/L B. 3.33 g/L C. 45 g/L D. 7.5 g/L I think b

9. ## statistics

Of 1735 people who came into a blood bank to give blood, 373 people had high blood pressure. Estimate the probability that the next person who comes in to give blood will have high blood pressure.

10. ## calculus

The position of two particles on the s-axis are s1= cos(t) and s2= cos(t+(symbol for pie)/4) a. what is the farthest apart the particles ever get? b. when do the particles collide?

11. ## algebra

a motorboat left a harbor and traveled to an island at an average rate of 12 knots, the average speed on the return trip was 10 knots. If the total trip took 8.8 hours, how far is the harbor from the island?

12. ## Penn foster

Which of the following sentences demonstrates the correct use of capitalizing direction words? The Northeast has been hit with an unusually cold winter. Poor Alex thought he was driving West. i live just South of Scranton. Are you heading East

13. ## statistics

You plan to conduct a survey to find what proportion of the workforce has two or more jobs. You decide on the 90 percent confidence level and state that the estimated proportion must be within 2 percent of the population proportion. A pilot survey reveals

14. ## psychology

In cults, followers trade off ______________ in order to gain ______________.

15. ## physics

At the local grocery store, you push a 14.0-kg shopping cart. You stop for a moment to add a bag of dog food to your cart. With a force of 12.0N, you now accelerate the cart from rest through a distance of 2.30m in 2.55s. What was the mass of the dog food?

16. ## math

the price of a computer fell 20% this year, if the computer now cost \$850, how much did it cost last year?

17. ## math

A new machine that deposits cement for a road requires 13 hours to complete a one-half mile section of road. An older machine requires 15 hours to pave the same amount of road. After depositing cement for 2 hours, the new machine develops a mechanical

18. ## COLLEGE ALGEBRA

THE PRIMETER OF SOME TRAFFIC SIGN MUST BE 78INCHES ALSO ITS LENGTH IS 7INCHES LONGER THAN ITS WIDTH FIND THE DIMENSIONS OF THE SIGN WHAT IS THE LENGTH WHAT IS THE WIDTH

19. ## Chemistry

Zn + HCl --> ZnCl2 + H2 If 18 grams of Zn are used in the following reaction, how many grams of H2 will be produced?

20. ## Chemistry

2C2H6 +7O2 --> 4CO2 + 6H2O If 6 moles of O2 are used in the following reaction, how many grams of CO2 will be produced?

21. ## statistics

A normal population has a mean of 21 and a standard deviation of 5. Compute the z value associated with 24 What proportion of the population is between 21 and 24? What proportion of the population is less than 18?

22. ## Algebra

The measure of the compliment of an angle is 1/9th the measure of the angle. Find the measure of the angle

23. ## psychology

select one theory of personality and use this theory to tell Jennifer what factors about this stage might be impacting her perspetive of this situation. I have no clue what my instructor is looking for. Can you help me?

24. ## teaching math

Indicate whether the deductive reasoning used is an example of affirming the hypothesis or denying the conclusion. If a number is divisible by 3, then the sum of the digits of that number is divisible by 3. The sum of the digits of a number is not

25. ## Calculus

Find the indefinite integral (integral sign) 3te^2tdt

26. ## math

Please help. the question is: Estimate the quotient. Tell what compatible numbers you used 817 divided by 4

27. ## calculus

Find the dimensions of the largest open-top storage bin with a square base and vertical sides that can be made from 108ft^2 of sheet steel. (Neglect the thickness of the steel and assume that there is no waste)

Jim is beginning his research on franchise business in order to find one that meets his needs. A quick,easy way to get general information is to

29. ## Math

A college class with 30 sophomores, 18 juniors, and 12 seniors is divided into project groups where each group has the same number of sophomores, juniors, and seniors. What is the greatest number of groups that can be formed? How many sophomores, juniors,

30. ## math

Mrs, jones is having a pizza party for 19 students. each pizza will be cut in 6 slices. how many pizzas will Mrs jones need to order?

31. ## Math

Make the following changes to the number 2.614. The 1 is worth one tenth as much. The 4 is worth 10 times as much The 2 is worth one tenth as much Make the 6 worth 10 times as much So I'm not sdure if my answer I'd 6.241 or .6241

32. ## Math

find the angle θ in the right triangle in the following problem. Round to the nearest degree, if necessary. cos θ = 0.8192 A = 45 H = ?

33. ## algebra

find the zeros of f:f(x) = 10 − 4x x= ____

34. ## algebra

A(w)= sqrt w^2+13, find A(r+1)=

35. ## algebra

A(w) = sqrt. w^2+13, find A(4)=

36. ## algebra

f(x)=|x+5|; f(a)=9 find smaller value and larger value

37. ## Physicsl Science

A heat pump releases 103.0 kcal as it removes 54.0 kcal at the evaporator coils. how much work does this heat pump ideally accomplish? Answer should be in KJ

38. ## Still confused

An investment adviser invested \$14,000 in two accounts. One investment earned 4% annual simple interest, and the other investment earned 2.5% annual simple interest. The amount of interest earned for 1 year was \$458. How much was invested in each account?

The length of a rectangle is 3 feet less than twice the width of the rectangle. If the perimeter of the rectangle is 144 feet, what is the length? am looking for the length, not the width. Thanks

40. ## algebra

A triangle has a perimeter of 56 centimeters. Each of the two longer sides of the triangle is three times as long as the shortest side. Find the length of each side of the triangle

41. ## Astronomy

Why is it possible that the Sun may then have been in a different constellation than your "Sun Sign" on August 12, 1953.

42. ## interpersonal communications

because words have human senders and receivers, they also have multiple intentions and interpretations. True or False

43. ## Chemistry-Stoichiometry

what is the limiting reactant if 0.10 moles Fe and 0.16 moles O2 react according to the reaction 4Fe +3O2 -> 2Fe2O3?

44. ## bramalea secondary school

how many ways can you roll a pair of standard dice without getting a double?

45. ## calculus 1a

simplify the following expression tan(sin^-1(2x))

46. ## Chem 121

A solution is made by dissolving 0.35 mole of LiI in enough water to give a final volume of 260.0 mL. What is the molarity of the solution?

47. ## Chem 121

How many grams of NaOH are present in 9.0 mL of a 8.0% (m/v) NaOH solution

48. ## Accounting

MHS currently has \$1,150,000 in cash. How long would it take them to accumulate \$2,000,000 in cash? Assume an interest rate of 5%.

49. ## Math

99 employees in a factory earn a salary of \$28,000 per year, while the CEO makes \$766,000 annually. What are the mean and median salaries for all 100 people? Is the mean or the median the more appropriate measure of "center" in this case? Explain. I have

50. ## Chemistry

1.What is the molarity of a solution of silver perchlorate, AgClO 4, if 3.2 moles of silver perchlorate are dissolved in 1.5 liters of water?

51. ## Chemistry

1.What is the molarity of a solution of silver perchlorate, AgClO 4, if 3.2 moles of silver perchlorate are dissolved in 1.5 liters of water?

52. ## Chem 141

Write the three thermochemical equations needed to calculate the delta H for the below reaction.? 2Mg(s) + O2(g) --------> 2 MgO(s) delta H rxn = ? (Include delta H values in kJ for each reaction)

53. ## science

MVP SHOULD BE RULED OUT, WHICH MEANS EMIMINATE THE POSSIBILITY OF

Can you describe some situations in which you would have liked to exchange information between Excel and some other applications? What are these applications, and why was such an exchange desirable? How might such exchanges make your work faster, more

55. ## Statistics

What key words tell you that the Hypothesis is to be set up as a 1 Tail UPPER?

56. ## Statistics

The Gibbs Baby Food Company wishes to compare the weight gain of infants using their brand versus their competitor’s brand. A sample of 40 babies using the Gibbs products revealed a mean weight gain of 7.6 pounds in the first 3 months after birth. The

57. ## Statistics

8. A sample of 65 observations is selected from one population. The sample mean is 2.67 and the sample standard deviation is .75. A sample of 50 observations is selected from a second population. The sample mean is 2.59 and the sample standard deviation is

58. ## statistics

7. A sample of 40 observations is selected from one population. The sample mean is 102 and the sample standard deviation is 5. A sample of 50 observations is selected from a second population. The sample mean is 99 and the sample standard deviation is 6.

59. ## statistics

Please analyze the following data using the T-test for Unpaired data: A school district wants to determine if the girls are equal to boys in test scores. They took a random sample of 22 8th grade girls and 24 8th grade boys. The district looked at recent

a. What type of information does managerial accounting provide?

61. ## teaching math

Indicate whether the deductive reasoning used is an example of affirming the hypothesis or denying the conclusion. If a number is divisible by 3, then the sum of the digits of that number is divisible by 3. The sum of the digits of a number is not

62. ## medical

should corrections be date and time stamped and why?

63. ## calculus

What is the derivative of square root x ?

A particle starts at x=0 and moves along the x-axis with velocity v(t)=2t+1 for time t is less than or equal to 0. Where is the particle at t=4?

65. ## math

A piece of string 25 inches long will be cut into -inch pieces. How many pieces will there be? a. 29 b. 34 c. 37 d. 41

66. ## math

Alex lives 500 yards from the park.How many inches does Alex live from the park ?

67. ## Education financial

To develop a salary schedule that is fair and equitable compensation for all staff.explain what each level and position would include. Lead teacher, asst. Teacher, supervisor,Administrator

68. ## Math

The cost of lunch is \$45.00. Tax is 8.75 percent. Tip is 20 percent. What is the total amount?

69. ## Physics

Two hockey players on ice skates push off of each other. One has a mass of 60 kilograms. The other has a mass of 80 kilograms. What is the 60-kilogram player’s momentum?

70. ## Math

I need help with this.The question is Fedinand has a rectangular square garden.The garden is 7 1/2 feet wide.The area of the garden is 150 square feet.What is the length of Ferdinand's garden?Write the division needed for this problem.Do not solve.

71. ## physics

A ball is thrown straight up with enough speed so that it is in the air for several seconds. Assume the positive direction is upwards. What is its velocity 1.5s before it reaches its highest point?What is the change in its velocity, v, during this 1.5-s

22+49

73. ## statistics

Post a null hypothesis that would use a t test statistical analysis.. Use the same hypothetical situation taken in the t test hypothesis, and turn it into a null hypothesis using a one-way ANOVA analysis and a two-way ANOVA.

74. ## algebra

Harry drove for 6 hours on the freeway, then decreased his speed by 20 miles per hour and drove for 6 more hours on country road. If his total trip was 624 miles, then what was his speed on freeway?

75. ## math

WHAT IS THE LATERAL SURGACE AREA OF A RECTANGULAR PRISM WITH THE BASE PERIMETER OF 150 MM AND A HEIGHT OF 5 MM

76. ## math

How do you determine the dimensions of a rectangular prism that is 10 cubic feet?

77. ## Physical science

A 11-kg box is dragged across a frictionless surface by a force F=55N. the box travels 4.0ft. what is the work done by the applied force F and the work done by the normal force?

78. ## Physics

A ball is thrown straight up at a launch velocity of 15m/s. What is the velocity when it returns to the throwers hand?

79. ## math

write a integer thatrepresents 59ft tall and the write its opposite

80. ## math 210 fundamentals of geometry

Complete Problem 31 in Section 5.2 Exercises (Ch. 5) of Essentials of Geometry for College Students. Use the table below to show your work and solve the problem. You may add or delete rows as necessary.

81. ## english

i need to know what are the simile's,metaphors, and personifications in A SUMMER lOVE POEM BY NIKKI GIOVANNI CLOUDS FLOAT BY ON A SUMMER SKY I HOP SCOTCH OVER YOU RAINBOWS ARCH FROM GROUND TO GOLD I CLIMB OVER YOU THUNDER GRUMBLES, LIGHTNING TUMLES AND I

82. ## Math

For each person with the flu there six with only flu symptoms. How many people out of forty would be expected to have only flu symptoms?

83. ## Math

A pair of dice is rolled, one is red other is green. Find the probability that the sum is 6

84. ## math

A salesperson earned 33,250 on annual sales of 950,000. What is her rate of commission.

85. ## math

Janice walked around two sides of a square park. The perimeter of the park is 1,200 yards. How many yards did Janice walk? Explain your answer.

86. ## Early Childhood Education

Lesson Plan for 3 year olds: See If I am doing it correctly. Goal: To teach how to recognize the first and last letter of their names. Objective: The children will identify and name the first and last letter of their names. Standards Include: Georgia Early

87. ## Early childhood education

Consider these two sentences from Michaela: A) Age 4 years: "I miss you, Nana!" (spoken over the phone to her grandmother who had returned home after a visit). B) Age 4 years, 6 months: "I'm going to miss you, Nana" (spoken in person to her grandmother who

88. ## Physics

A plane diving with constant speed at an angle of 52.5° with the vertical, releases a package at an altitude of 499 m. The package hits the ground 3.87 s after release. How far horizontally does the package travel?

89. ## algebra

a car rents for \$45 per day plus 21 cents per mile you are on a daily budget of \$66 what milage will call you to stay within your budget

90. ## algebra

A bus was purchased for \$70,000, assuming the bus depreciates at a rate of \$6,000 per year(straight line depreciation) for the first 10 years, write the value v of the bus as a function of the time t (measured in years) for 0 < t < 10

91. ## disease

________ is the most frequently reported bacterial sexually transmitted disease in the United States. A. Chlamydia B. Syphilis C. Herpes D. Gonorrhea

92. ## algebra

Q(t) = 5, if 0 ¡Ü t ¡Ü 5 −t + 7 if 5 < t ¡Ü 8 t − 1 , if 8 < t ¡Ü 11 Q(0)=__ Q(x),6< x

93. ## algebra

A bus was purchased for \$80,000. Assuming the bus depreciates at a rate of \$6,000 per year (straight-line depreciation) for the first 10 years, write the value v of the bus as a function of the time t (measured in years) for 0 ¡Ü t ¡Ü 10. v(t)= ____

94. ## ALGEBRA

A(w)= sqrt. w^2 + 13, A(-c)=

95. ## algebra

A boat was purchased for \$45,000. Assuming the boat depreciates at a rate of \$4700 per year (straight-line depreciation) for the first 8 years, write the value v of the boat as a function of the time t (measured in years) for 0 ¡Ü t ¡Ü 8. v(t) = ____,

96. ## algebra

sqrt. w^2+13, find A(0)

97. ## algebra

g(x)=6x^2+7, find g(c+5)=

98. ## algebra

Find all points on the x-axis that are 10 units from the point (7, 6). (Hint: First write the distance formula with (7, 6) as one of the points and (x, 0) as the other point.)

99. ## algebra

a triangle has a perimeter of 126 centimeters, each of the 2 longer sides of the triangle is three times as long as the shortest side. Find the length of each side of the triangle.