bart

Most popular questions and responses by bart
1. physics

I do not understand the answer that was given to me on a post dated Nov. 23. Please help explain my questions that appear at the end of this post. Bart ------------------- Posted by Bart on Wednesday, November 23, 2011 at 6:52am. A baseball is hit with a

2. Chemistry

A hot lump of 25.6 g of aluminum at an initial temperature of 57.4 °C is placed in 50.0 mL of H2O initially at 25.0 °C and allowed to reach thermal equilibrium. What is the final temperature of the aluminum and water given that the specific heat of

3. Chemistry

In a constant-pressure calorimeter, 65.0 mL of 0.320 M Ba(OH)2 was added to 65.0 mL of 0.640 M HCl. The reaction caused the temperature of the solution to rise from 21.98 °C to 26.34 °C. If the solution has the same density and specific heat as water

4. Pre-Alegebra

You spin a spinner that is divided into 6 equals parts once and roll the number cube once. Find the probability that the spinner stops on the same number that you roll the number cube?

A bag contains 7 red marbles, 2 blue marbles, and 1 green marble. If a marble is selected at random, what is the probability of choosing a marble that is not blue? 7 red marbles plus 1 green marble = 8/10 = answer = 4/5

6. Probability

Sharon was palying darts. She threw six darts and all of them hit the target. Which of the following could be her score? The target goes from 9 in the center, then 7, 5 , 3, and 1 on the outside ring. Possible Scores: 4 17 56 28 29 31 50 8 Please give a

7. Math

Sharon was playing darts. She threw six darts and all of them hit the target. Which of the following could be her score? The target goes from 9 in the center, then 7, 5 , 3, and 1 on the outside ring. Possible Scores: 4 17 56 28 29 31 50 8 Please give a

8. math probability

A man is camping. He has packed 8 black socks, 8 blue socks, 8 white socks, and 8 gray socks. It is still dark when he gets dressed. How many socks would he have to pull out of his bag to BE SURE that he has a matching pair?

9. Geometry

I am to find "d" (the hypotenuse)in the simplest radical form of a right triangle. The two angles are 30 degrees on top and the on the bottom is 60 degrees. Of course the opposite side to the left of 60 is 90 degrees. My options are: A) 8sqrt3 B) 4 C)

10. Math probability

How many ways can three cars be parked in a row of four parking spaces? I have no idea how to do this?

11. Math

I was thinking that I have to multiply but that doesn't make sense. However, I am terrible at story problems. A child's dose of medicine is 1/6 of a pre-measured dose cup. If the bottle of a medicine is the size of 9 doses, how many children's doses are

12. Algebra HELP:(

Use the discriminant to determine how many real-number solutions the equation has. 36x2 - 12x + 1 = 0 How do I do this?

13. math

I just do not understand how to figure this out. Find the number of subsets of the given set. {math, English, history, science, art} Would I do something like this: 1. {} 2. Math 3. English 4. history 5. science 6. art 7. Math and English 8. math and

14. math

In a game of Incan basketball, A points are given for a free throw and B points are given for a field goal, where A and B are positive integers. If A=2 and B=5, then it is not possible for a team to score exactly 1 point. Nor is it possible to score

15. physics

A baseball is hit with a speed of 27 meters per second at an angle of 45 degrees. It lands on the flat roof of a 13 meter tall building. If the ball was hit when it was 1 meter above the ground, what horizontal distance does it travel before it lands on

16. Probability math ?

If I am rolling a single dice what is the probability of rolling a number that is divisible by 2 and 3? The only number divisible by 2 and 3 is 6. So, would the answer be 1 out 6 or 1/6

17. math

The 18th hole at the Riverwoods Golf Course is 441 yards long. How long would it be on a model with a scale of 2.5 inches to 100 yards? I do not understand how to figure this out.

18. Math

a skateboard with a mass of 1.5 kg moves up a quarter pipe to a height of 5.0 meters. How fast was it moving at ground level?

19. Statistics am I correct?

Each of ten tickets is marked with a different number from 1 to 10 and put in a box. If you draw a ticket at random from the box, what is the probability that you will draw 2, 3, or 1? A) 1/2 B) 1/10 C) 1/3 D) 3/10 P=1/10 for 1 P=1/10 for 2 p=1/10 for 3

20. geometry

I need to find the area of the shaded portion of a circle with a square in the middle all corners touching the circle. My square has a line measurement of 10 cm. I know that the area of the square is 100 cm(10 x 10). But I am not sure what to do with the

21. math

Not sure if I did this right. A worker has readings that take minutes each to read and record. How many readings can be completed in 192 minutes? 8/3 = 192/x = 8x = 576/8 = x = 72 Answer = 72

22. math

I have no idea how to do this: Express the ratio in simplest form. 5 yards to 24 feet convert yards to feet: 12 x 5 = 60 ft. Would the answer be 60:24 ? is this the simplest form if the answer is correct?

23. Math

A 6-pack of 4oz containers of yogaurt costs 2.99. what is the unit price in cents per ounce? Round to the nearest hundredths of a cent. First I would take 6 x 4 = 24 oz. Then I would divide 2.99/24 and get an answer of .1245833. Would my answer be 12

24. Math: Help: probability

Which answer, if any, is correct to: Two cards are drawn without replacement from an ordinary deck of 52 playing cards. What are the odds against drawing a club and a diamond? My options are 13:204; 204:13, 13;191; or 191:13 I had two different people help

25. Math

Assume that the weight loss for the first two months of a diet program has a uniform distrbiution over the interval 6 to 12 pounds. Find the probability that a person on this diet loses less than 10 pounds in the first two months. Not sure what to do. A)

26. Math-Probability

I do not know how to figure out his next shot. A basketball player has made 34 of her last 42 freethrow attempts. What probability would you assign to the player’s next free throw being successful? Explain your reasoning. 34/42 = 17/21 I would assume

27. Lost

consider a bowl containing 36 different slips of paper. Ten of the slips of paper each contain one of the set of digits 0 through 9 and 26 slips each contain one of the 26 letters of the alphabet. Determine the probabilities of the events specified.

28. Math Probability

consider the experiment of selecting a card from an ordinary deck of 52 playing cards and determine the probability of the stated event. A red card or a card showing a 5 is drawn. There are 26 red cards and 2 extra fives. Would my answer be 28/52?

29. Math

Write the numbers in order of increasing size. 0.81, 0.811, 0.888, 8/10, 0.8181 I think it may be 0.888, 8/10, 0.81, 0.8181, 0.81

30. Geometry

A concrete pad has dimensions 9 ft by 9 ft by 4 inches. How many cubic yards of concrete does it contain?

What are some methods that are used to uncover basic emotions? Which one of these methods is the most effective? Why?

Consider the experiment of rolling a single die. Find the probability of the event described. What is P(odd or prime? Since this is an "or" problem would the problem consist of 3 chances out of 6 thus my answer = 1/2?

33. Algebra: is this right?

the amount of money remaining to be paid on a loan, y, is a function of the number of months, x. Suppose that monthly payments of \$225 are to be made on an original loan amount of \$3,000. Write an expression in terms of x that gives the amount of money

34. Math

The U.S. Department of Defense makes use of statistics in designing weapon systems for tanks and other forms of armor. By measuring the results of the firing of a weapons system under simulated combat conditions, ballistics researchers can estimate the

35. Math: i do not understand

A tractor manufacturing company machines axles to extremely small tolerances. The main power axles have a mean diameter of 3.0000 inches and a standard deviation of 0.0050 inch. What is the probability that a given axle will have a diameter between 2.9915

36. math

ive been working on my sat's and i cant seem to figure out how to answer the following question. a right angle is given. the length of ba is 20. what is the approx length of bc? sin= .643 cos= .766 tan= .839 the answer is 12.9 but i don't know how that is.

37. math

jay corp. bought machine for 15000. machine is expected to produce 10000 units. machine has residual value of 5000. assuming machine produces 400 units during year 1.what should depreciation expense be

38. Algebra 2

Two days ago "Steve" helped me with this problem. I am grateful to him. I didn't get it and asked for him to help me again. He showed it to me again, but I needed more steps shown. Then I think he was finished for tutoring for the day before I could see it

39. Algebra 2

I know the answer to this question is: -1. I got that answer by substituting -1 in for x. Please show me how I should do this the correct way. (x/(3x+6))-((x+1)/(3x-6))=(1/((x^2)-4)) Thank you.

40. L.arts

the book says Ponyboy,Dally, and Johny saved the kids in the hall way when they were in the church is that true? because in the movie they didn't

41. Algebra 1

I do not understand how to figure out probability. Lee has an urn with 8 white marbles and 10 black marbles. A marble is drawn at random and not replaced. Then a second marble is drawn randomly. What is the probability that the first is white and the

42. Algebra 1

I do not understand how to figure out probability. Lee has an urn with 8 white marbles and 10 black marbles. A marble is drawn at random and not replaced. Then a second marble is drawn randomly. What is the probability that the first is white and the

43. Algebra: I don't understand

If P(A) =7/36, P(B) =1/6, and P(A and B) = 0, what can you say about P(A or B)? Would the answer be 13/16? I am just guessing. I am assuming we have to find a commond denominator and then add?

44. Standard Deviation-What?

I cannot figure out how to do standard deviation. standard deviation 2, 5, 47, 11, 13, 48, 39, 36

Find the distance between the given points (3, 5) and (8, 2) (8-3)^2 + (2-5)^2 5^2 + -3^2 25 + 9 = 34 sqrt of 34 = 5.83

Are the lines parallel and how did I come to this conclusion? y + x = -5 and y - x = -5 first I it so y is by itself y = -x -5 second equation = y = x +5 Would the answer be yes? y= -5 and y = 5? Not sure I really understand thx.

47. Exterior angle what am I doing wrong?

Find the measure of the indicated exterior angle. Exterior angle is: 197-5n Two interior angles are: 5n+21 and n+11 I set it up as: 197-5n=5n+21+n+11 197-5n=6n+32 165=11n but this does not make sense.

48. math Did I do it right?

Use front-end estimation to find the value of the expression. I do not understand (without adjustment) 687 - 239 (without adjustment) is this right? 600 + 200= 800 + 126=926

49. math-lost

List all the subsets of S. You may use "C" for chocolate, "V" for vanilla, and "M" for mint. S = {Chocolate, Vanilla, Mint} I do not understand how to do this.

50. Grammar

What's wrong with the following sentence? He was in trouble for acting like a tomfoolery.

51. Physics

A villain is knocked out of a low-flying aircraft by a heroic scientist-adventurer at an altitude of 370 m. After falling for 120 m the villain reaches terminal velocity. 7.16 seconds after reaching terminal velocity, the villain crash lands in a river

52. Physics

You slide your friend with a mass of 65 kg out of the way as they are blocking the exit and keeping you from escaping from physics class where you have been tormented by problems for the last hour and a half. The coefficient of kinetic friction between the

53. Science

What is the volume of a rectangle, H= 25 m, L= 100 m, W= 45 m.

54. math

a mountain, 200 feet above sea level, is near a valley 700 feet below sea level. How many feet higher is the mountain than the valley? 900 feet

55. science

what is the standard SI unit for measuring mass? kilogram just need to know if that's the right answer or not.

56. Algebra: pleace check

find the other endpoint of a line segment with the given midpoint (6,4) endpoint ((3, 5). 6= 3/2 and 4 = 5/2 12=6 and 8 = 10 12-6 and 8 - (-10) End Point = (6, 18)

Find the equation of a line that passes through the point (1,2) and has a slope of 1/3. Show how you found the equation. Would the equation be: y-2=1/3(x-1) Do I need to finish this? I am not sure how.

There are 30 fish in a pond. We know that 13 of these fish are males, 4 of these males are salmon, and there are 8 salmon in the pond. What is the probability that a randomly chosen fish is a salmon, given that it is a male? I think they are just asking

Consider a bowl containing 36 different slips of paper. Ten of the slips of paper each contain one of 16) the digits from the set 0 through 9 and 26 slips each contain one of the 26 letters of the alphabet. If one slip is drawn at random, what is P(odd

60. math Did I do it right?

Calculate using expanded notation, showing steps. 72 + 806 Did I do it right? 72 + 806 (7*10) + (2*1) + (8*100) + (6*1) =(8 * 100) + (7*10) + (6*1)

61. math

Write the negation of the following: Every rectangle with four equal sides is a square. A) No rectangle with four equal sides is not a square. B) Every square with four equal sides is not a rectangle. C) Every rectangle with four equal sides is not a

62. Math

I do not understand how to decide which method would you use to determine whether this proportion is true or false? 19/6=4/27

63. math

In a game of Incan basketball, A points are given for a free throw and B points are given for a field goal, where A and B are positive integers. If A=2 and B=5, then it is not possible for a team to score exactly 1 point. Nor is it possible to score

64. Physics

A spring (k=302 N/m) placed vertically on a surface has a 548 g ball placed on top of it. How far must the spring be compressed in order for the ball to be traveling at a speed of 2.8 m/s when it is located 438 cm above its initial position?

65. science

why should nucleotides be in proper sequence during protein synthesis?

66. Algebra 2

I know the answer to this problem is -1. I found that by substituting for x and seeing if it worked. How should I do it the correct way? (x/(3x+6))-(x+1/3x-6)=(1/(x^2)-4)

67. Algebra 2

When dealing with imaginary and complex numbers, are there 2 solutions? I.e.: x^2=4 x=2,-2 For: x^2=-4 x=2i or -2i ? (Is there a 2i and -2i, like for real numbers?)

68. Algebra 2

(2v-7)^(1/2)=v-3

69. Algebra 2

(1/(n^2))+(1/n)=(1/(2(n^2)))

70. Algebra 2

(18-n)^(1/2)=(n/8)^(1/2)

71. Algebra 2

(20-r)^(1/2)= r

72. Science

What is the volume of a rectangle, H= 25 m, L= 100 m, W= 45 m.

73. Science

What is the volume of a rectangle, H= 25 m, L= 100 m, W= 45 m.

74. bibb

Consider a rider on a Ferris wheel which is turning at constant speed. (a) At what point is the upward component of the force of the seat on the rider minimum? (b) At what point is the upward component of the force of the seat on the rider maximum? Justify

75. Algebra

I am to find the equation of the axis of symmetry and the coordinate of the vertex of the graph of each function. I don't undertand y=2x^2+4

76. math

a mountain, 100 feet above sea level, is near a valley 700 feet below sea level. How many feet higher is the mountain than the valley? 800 feet

77. science

the width of a door and the length of a baseball ball are about a ______ long. a)meter b)centimeter c) liter d) kilometer e) none of the above A

78. health

What are some methods that are used to uncover basic emotions? Which one of these methods is the most effective? Why?

y = 2x^2 I am to decide if this is a linear, quadratic or exponential function. I chose that the above function is quadratic. Am I right?

80. albebra

I do not understand how to find x on a graph when there is no equation. I have the possible answers: a) x= -3, b) x=-1, c) x=5, d) x=1 It asks me to find the value of x when y is 5; however, the graph I have has a line (0,2) on the y axis and on the x axis

81. Algebra HELP:(

I do not understand how to find x on a graph when there is no equation. I have the possible answers: a) x= -3, b) x=-1, c) x=5, d) x=1 It asks me to find the value of x when y=5

find the midpoint of the line segment having the given endpoints(0,5) and (0, -8). (0+0/2, -8+5/2) = (0/2,-3/2)= (0,-1.5) P = (0, -1.5)

83. Algebra: ?

Give the equation of a line that is perpendicular to the graph of each equation. I do not understand. y=12 Would I just write the opposite? y = -12

84. Algebra HELP :(

If you write a check without enough money in the bank, a certain store will charge you a penalty if the check is returned to them from the bank. The penalty is 5% of the amount of the check plus a \$10 processing fee. Let n= the amount of the check and p

85. Algebra HELP:(

The total cost of purchasing from a mailorder catalog, y, is a function of the cost of the items purchased, x. In addition there is a fixed shipping charge of 2.75 per order, and sales tax is 8%. Write an equation that shows the relationship between the

86. geometry

I am not sure I understand especially the part where it says "the value". If the surface area of a sphere decreases, will the value of the volume remain the same? If we decrease the radius than we should have a different volume - right?

87. Math

I do not understand how to figure this out: Calculate variance:

Does (-2)^7 = -2^7

(-2)7=-2^7 -2^5 = -2*-2 = 4 * -2= -8 * -2 = 16 * -2 = -32

90. chemistry

how would you state Ag2CrO4 acting as a cathode?

1. science help!!!

just be aware that connexus does change the order of questions from time to time so dont always trust question numbers and letters. post actual question/ answer or some statement explaining etc

posted on December 4, 2018
2. Physics

Convex Mirror

posted on February 5, 2017
3. english

The answer is B. Although it may seem the other answers are correct as well, in fact they are not. A 'complex paragraph' is indeed one which explains multiple sides of an issue, but favors one, thus only one main topic is represented. It doesn't really

posted on February 5, 2017
4. Chemistry

6.9

posted on February 27, 2014
5. Physics

Please other Problem 1 & 2!

posted on May 4, 2013
6. Algebra 2

Steve, thank you for showing me again. Yes, I couldn't quite get it last time. I understood factoring out the 1/3 on the left side. I understood factoring the denominator on the right side. After that I have trouble. Could you please show it to me again

posted on January 10, 2013
7. Algebra 2

Thank you for your help. I still need some more explaining. I understand factoring out the 1/3 on the left hand side. I also understand factoring the denominator on the right hand side. After that I have trouble. Could you please show it to me again, but

posted on January 10, 2013
8. Physics

Thank you!

posted on January 1, 2013
9. Algebra 2

Thank you!

posted on October 24, 2012
10. Algebra 2

Thank you!

posted on October 19, 2012