# rocky

Most popular questions and responses by rocky
1. ## chemistry

what is the percent by mass of NaHCO3, in a solution containing 20 g NaHCO3 dissolved in 600 mL H20

A firm is assigned the network part 128.171. It selects an 10-bit subnet part. a) Draw the bits for the four octets of the IP address of the first host on the first subnet.

3. ## chem

A 0.167-g sample of an unknown compound contains 0.00278 mol of the compound. Elemental analysis of the acid gives the following percentages by mass: 40.00% C; 6.71% H; 53.29% O. 1.)Determine the molecular formula of this acid. 2.)Determine the molar mass

4. ## Chemistry

a 40-year-old manger at a prominent legal firm in L.A experiences abdominal pain post lunch. He goes to the restroom a couple of times, but continues to experience pain and cramps. He evevtually decides to get himself examined. While questioning him, you

5. ## Chemistry

a sample of gas of unknown pressure occupies 0.766 L at the temperture of 298k the same sample of gas is than tested under known conditions and has the pressure of 32.6kPa and occupies 0.664 L at 303 k. What is the original pressure of gas

6. ## chemistry

At 20°C, a solution contains 120 g of NaNO3 in 100 g of water. Is this solution saturated, unsaturated, or supersaturated?

7. ## Texas History

Name one main success and one main failure of the Republic of Texas government. Then, tell how these factors contributed to Texas’ annexation by the United States. Anyone know a good example of this question?

8. ## Spanish

Can anyone help me? I don't think the translator is doing this correctly. Is this english version translated to spanish correctly? Thanks for any help!! My son Kyle went on vacation to the Grand Canyon. He loved standing at the top seeing how big it really

9. ## algebra

Using the equation below as a model, fill in numbers in the place of a and b to create a rational equation that has an extraneous solution. x+a/ax=b/x Part 1. Show all work to solve for x in the equation and check the solution. Part 2. Explain how to

10. ## math 1

Wei received \$55.35 in interest on the \$1230 in her credit union account. If the interest varies directly with the amount deposited , how much would Wei receive for the same amount of time If she had \$2000 in the account?

11. ## math 1

Karen earns 28.50 for working six hours. If the same amount m she earns varies directly with h the number of hours she works , how much will she earn for working 10 hours?

12. ## Physics

Two air-track carts move toward one another on an air track. Cart 1 has a mass of 0.336 kg and a speed of 1.16 m/s. Cart 2 has a mass of 0.634 kg. What speed must cart 2 have if the total momentum of the system is is to be zero? What is the system's

13. ## Math1

The number of gallons g of fuel used on a trip varies directly with the number of miles m traveled . If a trip of 270 miles required 12 gallons of fuel, how many gallons are required for a trip of 400 miles?

14. ## chemistry

equilibrium CO(g)+2H2(g)CH3OH(g)calculate these concentrations:CO(g) in an equilibrium mixture containing 0.933mol/L H2 and 1.32 mol?l CH3OH.

15. ## math 1

A bottle 150 vitamins costs \$5.25. If the cost varies directly with the number of vitamins in the bottle, what should, how a bottle with 250 vitamins costs?

16. ## algebra

Factor the expression 25x^2-60xy+36y^2 into a product of binomials.

17. ## Math1

Bacteria can multiply at alarming rate when each bacteria splits into two new cells , thus doubling. If we start with only one bacteria which can double every hour , how many bacteria will have by the end of one day?

18. ## Geomatry

Which Solid can be defined as the regular polyhedron (a solid with all faces identical regular polygons) with the greatest number of faces? Please help thank you http://en.wikipedia.org/wiki/Regular_polyhedra There are nine regular polyhedra. Choose the

19. ## physics

A 58 kg skier has a speed of 9.5 m/s at point A. She then encounters a 1.75 m deep dip in the snow's surface that has a circular cross section with a radius of curvature of 12 m.

20. ## intermediate algebra

Rowing. Abby rows 10km. upstream and 10km. back in a total time of three hours. The speed of the river is 5km./h. Find Abby's speed in still water.

21. ## intermediate algebra

factor out the greatest common factor from the expression 24xyz^2+20x^2yz-4x^2z^2

22. ## Algebra

The average mark on a test in an algebra class is 80. If the two lowest scores of 34 and 48 are not counted, the remaining scores would average 83. How many students are in the algebra class?

23. ## @Ms. Sue

Why does everyone be rude and/or salty to you? You have helped me a lot as a student, and I am very thankful for it.

24. ## Chemistry

differentiate alkenes and alkynes, cis isomers and trans isomers. Describe how cis-trans isomers are used for night vision

25. ## AP US History

Analyze the extent to which TWO of the following influenced the development of democracy between 1820 and 1840. -Jacksonian economic policy -changes in electoral politics -Second Great Awakening -Westward movement

26. ## algebra

how do I simplify -2xyz^3/5x^2z^2 times 10xy/x^3

27. ## math 1

c-3d=27 4d+10c=120

28. ## intermediate algebra

use polynomial long division to divide 25x^3+40x^2+25x+10 by -5x^2-3x-2

29. ## algebra

factor the expression a^2-6ab+9b^2 into a product of binomials

30. ## algebra

Andrew factored the expression 20x^3-12x^2+8x as 4x(5x^2-12x^2+8x). But when Melissa applied the distributive law and multiplied out 4x(5x^2-12x^2+8x),she got 20x^3-48x^3+32x^2; thus, Andrew's solution does not appear to check. Why is that? Please help

31. ## algebra

The lengths of the sides of a triangle are x,2x+1,5x+4inches. If the perimeter is 53inches, what is the value of x?

33. ## PHYSICS

An airplane is flying straight and level at a speed vo = 150 mph and with a constant time rate of increase of speed v' = 20 ft/s^2, when it starts to climb along a circular path with a radius of curvature p = 2000 ft. The airplane maintains v' constant for

35. ## Chemistry

What are the various uses of radioactivity in healthcare? What are the future trends in healthcare with respect to the use of radioactivitiy?

36. ## Chemistry

A robust first grader goes for swimming lessons three times a week,and he enjoys it thoroughly.During the first week of December, he develops an upper respiratory infection, starts coughing continuosly, and has a high fever of 39ºC. His condition remains

37. ## intermediate algebra

Solve using the elimination method. Show all work. If the system has no solution or an infinite number of solutions, state this. 3x+7y=77 -2x+7y=42

38. ## algebra

Essay. show all work. A gardener wants to create a triangluar garden in the shape of a right triangle with shortest legth x-3y ft. and the middle length side x+6y ft. What ia an algebraic expression for the area of the garden? be sure to multiply this out

40. ## Math1

Find a bank account balance if the account starts with \$100 , has an annual rate of 4% , and the money left in the account for 12Yrs. This is a Exponential growth word problem.

41. ## math 1

you have 28 coins that are all nickles and dimes. the value of the coins is \$2.05. Find the amount of nickles and dimes that you have.

42. ## algebra

system of equations c-3d=27 4d+10c=120

43. ## algebra

-38=-4k-8+4k-28

44. ## maths

two sprinters runs the same race of 100m. One runs at a speed of 10m/s and the other runs at the speed of 8m/s. by what time will the first sprinter beat the other sprinter?

45. ## math

Which describes this type of series? -20 - 18 - 15 - 11 … I think it is both arithmetic and geometric

46. ## Chemistry

state three examples each of acids, bases,and salts commonly used in thera peutic processes. From the examples you state, select one acid, one base and one salt and describe how and where they are useed in therapeutic processes.

47. ## Chemistry

a freshmann is currently enjoying the arts studio program she is pursuing at a well know university. In her free time she likes to skate,take salsa dance lessons, and cook. She particularly enjoys and decides to pickle olives to the rescipe, she needs to

48. ## intermediate algebra

rewrite with positive exponents. Assume that even roots are nonnegative quanities and that all denominators are nonzero. [3/ua^2)^-4

Using polynomial long division to divide. 25x^3+40x^2-25x+10 by -5x^2-3x-2

50. ## intermediate algebra

use thr discriminant to determine wheather the following equations have solutions that are two different rational solutions;two different irrational solutions; or two imaginary solutions.8x^2+7x+3=0

51. ## intermediate algebra

Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions,state this. 3x+7y=77 -2x+7y=42

52. ## intermediate algebra

Solve uing the subtitution method. Show your work. If the system has no solution or an infinite number of solutions, stat this,3x-15y=-12 3x+24y=-12

53. ## intermediate algebra

compleletly factor the following expression 9y^2-16z^2

54. ## algebra

factor completely. remember to look first for a common factor. if a polynomial is prime,state this -4t^2+64

55. ## algebra

factorcompletely. if polynomial is prime, state this 9+8t^2-18t

56. ## algebra

factor by grouping if possible and check 5x^3+4x^2-10x-8

57. ## Algebra

Write a direct algebraic proof to show that if a/b=c/d, then a+c=b+d

58. ## Math1

195x^5 + 168x^4 - 28x^3 - 24x^2 This is factoring I have looked at everything.

59. ## math 1

6x+8y=4 8x-3y=19

60. ## math 1

3x - 8y = -17 2x -7y = -18

61. ## Algebra1

-3|2x+6|=-12 How to solve for x, I relley need help please!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

62. ## Chemistry

Discuss in detail, the role played by DNA andRNA in genetic diseases. what are the breakthroughs, if any, in the treatment/management of genectic diseases?

63. ## Chemistry

a girl is celebrating her 7th birthday. each guest is served one large slice of choclate cake, a hamburger, french fries, and some oranges. identify the food groups mentioned above. if one slice of chocolate cake contains 35g of carbohydrate, 15g of fat

64. ## intermediate algebra

Express in terms of i. 2 divided by sqrt.,-36

65. ## intermediate algebra

Subtract. (5x^6+9x^4-2x^3-3)-(8x^6-8x^5+x^4-4)

66. ## intermediate algebra

factor out the greatest common factor from the expression 6x^3yz^4-3x^2y^3z^4-18^4y^2z^3

67. ## algebra

factor out the greatest common factor from the expression. 18x^7-14x^2

68. ## algebra

The area of a rectangular athletic field is represented by the expression 81y^2-16z^2 square meters. Write an algebraic expression to represent one possible set of dimensions(in the sense " length times width") of the athletic field. Include correct units

69. ## Algebra

1/5(a-2)-2/5(a-3)>2a-1/3(4+5a)

70. ## Math

The mean height is 5 ft 4 in. How many students are in the class?

71. ## Biology

This is my question from my Biology paper. List which organs and tissues come from the mesoderm primary cell layer. Thanks

72. ## Puzzle Solving

RXhjaXRlbWVudCBhd2FpdHMuIE JpZyB0aGluZ3MgYXJlIG9uIHRo ZSB3YXkuDQpodHRwczovL2Rpc2 NvcmQuZ2cvWUZtcERaaA== Please help me to solve the given puzzle. the sequence and no. of words in a given line is same as in the question.

73. ## algebra

the sum of a 2 digit number is 6 when you reverse its digits you increase the number by 36 my answer is 3 is that correct

74. ## algerbra

The school is selling tickets the first day the school sold 11 senior tickets and 4 child tickets a total of \$93. the school sold \$71 worth of tickets the second day 9 senior tickets and 2 child tickets find the price of a senior ticket and the price of a

75. ## Math 1

392n^4 + 168n^3 + 168n^2 +72n

76. ## Math 1

80x^4 - 60x^3 - 60x^2 - 45x

77. ## math 1

c) 36,31,25,21,... t7 and t20 arithmetic and geo metric

78. ## Math1

use formula from 2c to find the values of t and t 7 20 c)36,31,25,21,...

79. ## math 1

y = -3x + 18 3x + 4y =0

80. ## math 1

x + y = 8 y = 1/3x + 4

81. ## math 1

6x + 8y=4 8x -3y=19 I did elimination. 82y=-82

82. ## math 1

9x-4y=-3 8x-3y=-1

83. ## math 1

4x+y=8 2x-3y=1

84. ## math 1

4x+y=2 -2x-3y=1

85. ## math 1

system of linear equations of substitution. a=2/b-3 a=2b-8

87. ## algebra

David weighs 20lbs.more than katy ,while Jonathon weighs 120lbs. less than three times katy's weight. If David and Jonathon weigh the same amont , how mush does katy weigh? How much much does David and Jonathon weigh?

88. ## algebra

Four times a number plus five times the number is the same as ten more then eight times the number. Find the number.

-9-(-1)

91. ## Chemistry

a middle-aged man has been diagnosed as being at high risk group of developing Coronary Artery Disease. Distinguish between the good and bad forms of this sterol. 'Explain the function of the good form of this sterol in the body. List the food groups that

92. ## Chemistry

the managing director of a well-known company on wall street thrives on a diet of fruit jam, bread, pasta, and coffee. She exercises intermittently. One day she decides to to her primary healthcare provider for a routine checkup. The healthcare provider

93. ## Chemistry

At a prominent state hospital, a 45 year old woman is recieving a combined modality' treatment for the intial stage of breast cancer. State the two aspects included in this treatment. State the methods by which a radiation oncologist can administer these

94. ## Chemistry

A 55 year old woman visits a popular eatery for lunch. She orders a cheese pizza and bacon pizza with extra cheese and has about 3 large glasses of cola (ph value 3). On the way back home she experiences heartburn and abdominal pain, and has diffigulty

95. ## intermediate algebra

SOLVE BY FACTORING 2a^2-3a=-5

96. ## intermediate algebra

Given the quadraticf(x)=x^2-14x+49, find a value of x such thatf(x)=36

97. ## intermediate algebra

Express in terms of i. 2sq.rt.divided by-36

98. ## intermediate algebra

rewrite with positive exponents. Assume that even roots are of nonnegative quantities and that all denominators are nonzero. [3}^-4 --- ua^2}

99. ## intermediate algebra

if a stone is tossed from the top of a 310 meter building, the height of the stone as a function of time is given by h(t)=-9.8t^2-10t+310. where t is in seconds, and height is in meters. After how many seconds will the stone hit the ground? Round to the