# Danielle

Popular questions and responses by Danielle
1. ## Math-

A ball is thrown vertically upward with an initial velocity of 96 feet per second. The distance s (in feet) of the ball from the ground after t seconds is s(t)=96t-16t^2 a.) at what time will the ball strike the ground b.) for what time t is the ball more

2. ## Chemistry

A professor orders 250 mL of house coffee at precisely 95°C. She then adds enough milk at 10°C to drop the temperature of the coffee to exactly 90° C. Calculate the amount of milk (in mL) the professor must add to reach this temperature. Assume that the

3. ## homework college chem.

a sample of gas occupies a volume at 73. 1 mL. As it expands, it does 135.0 J of work on its surroundings at a constant pressure of 783 torr. what is the final volume of gas?

4. ## math

of the first 20 customers at a restaurant one night 12 ordered a bowl of chicken noodle soup. at this rate how many bowls of chicken soup will be ordered if there are a total of 150 customers

5. ## math

you deposit \$200 in an account earning 3.5% simple interest. How long will it take for the balance of the account to \$221?

6. ## Chemistry

How many isomers does bromoethane (C2H5Br)??

7. ## Chemistry

What is the O-C-N bond angle in OCN-? Why is the answer 180 degrees?

8. ## Chemistry

One student calibrated a 50-mL burette by using the mass of water delivered. The student used an analytical balance which was previously calibrated by STEEL (density = 7.8 g/mL). During calibration, the temperature of water was found to be 19.0oC. The

9. ## simple algebra

Re arrange this to isolate A H=K+log(A/C) Thank you

10. ## home economics

what are the five branches of home economics?

11. ## Chemistry

Use VSEPR theory to predict the molecular geometry around either carbon atom in acetylene, C2H2. The Answer is linear. How do you figure out the answer is linear? I know you draw the lewis structure but when I drew it I thought the answer would be

12. ## Physics

The greater the work function for a metal, A) the greater the speed of the ejected electron B) the smaller the speed of the ejected electron C) the more electrons are ejected D) the lower the threshold frequency E) none of the above

13. ## Algebra

1. What are the next two terms of the following sequence? 1, 5, 9... A. 27, 211 B. 10,11 C.12,15 D.13,17 2. Which of the following are examples of arithmetic sequences? Choose all that apply. A. -2,2,6,10 B. 1,3,9,27 C. 5,10,20,40 D. 5,1,-3,-7 3. What is

14. ## Calc

Three students have ordered a 14 inch diameter pizza. They slice it with 2 parallel cuts, giving them 3 pieces with equal area. The two cuts are equidistant from the center of the pizza. Find the horizontal distance between one cut and the center of the

15. ## Chemistry

If you dilute 14.0mL of the stock solution to a final volume of 0.350L , what will be the concentration of the diluted solution? Before it, there was a question: How many milliliters of a stock solution of 5.60 M HNO3 would you have to use to prepare

16. ## chemistry

Which of the following atoms is paramagnetic? Zn, Sr, Kr, Te, Ca? How do you tell if the atom is paramagnetic or not?

17. ## Math

I need help with this questions. a). An overhead garage door has two springs, one on each side of the door. A force of 15 pounds is required to stretch each spring 1 foot. Because of a pulley system, the springs stretch only one-half the distance the door

18. ## statistics

In the following problem, check that it is appropriate to use the normal approximation to the binomial. Then use the normal distribution to estimate the requested probabilities. More than a decade ago, high levels of lead in the blood put 89% of children

19. ## precal 2

find values for b such that the triangle has no solution A=88 degree, a=315.6

20. ## chemistry

The bromination of acetone is acid-catalyzed. CH3COCH3 + Br2 CH3COCH2Br + H+ + Br - The rate of disappearance of bromine was measured for several different concentrations of acetone, bromine, and H+ ions at a certain temperature. [CH3COCH3] [Br2] [H+] rate

21. ## Calculus

A model for the food-price index (the price of a representative "basket" of foods) between 1984 and 1994 is given by the function I(t)=0.00009045t5+0.001438t4−0.06561t3+0.4598t2−.6270t+99.33 Where t is measured in years since midyear 1984, so

22. ## Math

The value of a computer bought in 1998 decreases as time passes. Two years after the computer was bought, it was worth \$2,600. Five years after it was bought, it was worth \$2,000. If the relationship between number of years past 1998 and value of the

23. ## algebra

A model car is constructed with a scale of 1 : 15. If the actual car is 12 feet long, which proportion represents the length x of the model car?

24. ## Math

A golfer hits a tee shot on a 285m long straight golf hole. The ball is hooked (hit at an angle) 14degree to the left. The ball lands 183m from the tee. How far is the ball from the hole?

25. ## Government

Why does Texas have so many special districts, and what are some of the problems associated with them?

26. ## Chemistry

What is the molar concentration of sodium in a 200ml solution prepared from 1.223g of sodium phosphate?

27. ## Physics

Three huskies are pulling a dog sled. The mass of the driver, sled and supplies is 145 kg. Snowy is pulling with a force of 83 N and 15.5degrees to the left of forward. Buster is pulling with a force of 75 N at 9degrees right of forward and Prince is

Which one of the following sentences uses pronouns correctly? A. Please give paul and I your individed attention. B.Jacob and me are going to set a meeting date. C.Carol told Sylvia and he the good news. D. Send the package to Tanya and him. The rule is

29. ## applying stoichiometry

Propane (C3H8) + oxygen------> carbon dioxide + water how many grams of carbon dioxide are produced from the reaction of 35.2 grams of propane?

30. ## Chemistry

For which of the following atoms is the 2+ ion paramagnetic? Sn Mg Zn Mn Ba The answer is Mn. How do you figure this question out?

31. ## science

What is homeostasis? Which animals have homeostasis? What does it have to do with science?

32. ## ALGEBRA 1

If x and 3x-10 represent the measure of the acute angles of a right tringle find the value of x. THANKS Let's take it step by step. A triangle has 3 angles in it. Those three angles, when added together, is 180. In a right triangle, one of the angles is 90

33. ## Physics

A golfer putts a ball to a point 22.0 ft. east of his position. The ball passed south of the hole. In order to sink the ball into the hole from his new location, the golfer will have to putt the ball 7.0 ft. on a bearing of 302T. How many feet away from

34. ## college chemistry

The equilibrium constant for the reaction Sr(s) + Mg2+(aq) Sr2+(aq) +Mg(s) is 3.69 x 10^17 at 25 C. Calculate Ecell for a cell made up of Sr/Sr2+ and Mg/Mg2+ half cells.

35. ## math

I am a number between 60 and a 100. My ones digit is 2 less than my tens digit. I am a prime number. What am I? Explain.

36. ## algebra

Please help me solve this: If an object is projected upward with an initial velocity of 112 feet per second from a height h of 128 feet, then its height t seconds after it is projected is defined by the equation h=-16t^2 + 112t + 128. How many seconds

37. ## pre calculus

A taxi company charges \$2.00 for the first mile (or part of a mile) and 20 cents for each succeeding tenth of a mile (or part). Express the cost C (in dollars) of a ride as a piecewise-defined function of the distance x traveled (in miles) for 0

38. ## Math

A kite has a string 100m long anchored to the ground. The string makes and angle with the ground of 65 degree. What is the horizontal distance of the kite from the anchor?

39. ## Chemistry hw

predict a likely mode of decay for each of the following unstable nuclides. Explain why. 1.) Mo-109 2.) Fr-202 3.) Rn-196 4.) Sb-132 5.) P-27 6.) Ru-90

40. ## Chemistry

Consider the reaction: N2O4(g) 2NO2(g) delta H^o =58.576kJ; Keq =0.87 at 55degrees celsius What is the effect of each of these changes upon the concentration of N2O4 at equilibrium? a)increasing the temperature b)increasing the volume c) adding more NO2(g)

41. ## Physics

Two toy locomotives approach each other along the same line, and upon collision both stop dead still. One locomotive has three times the speed of the other and the sum of their masses is 4.48 kg. What is the mass of the faster locomotive? What is the mass

42. ## English

Ihave to develop an outline for my essay topic "Healthy eating and Diabetis" I have a thesis. And I have include the Outline. Please make suggestions. I would certaingly appreciate it. Here is what I have done. What is your thesis statement? Even though

43. ## Geometry

Given: ABCD is a parallelogram;

44. ## Geometry

Angle DEF is similar to Angle HJK and the scale factor of angle DEF to anle HJK IS 5/2. If EF =15 FIND JK Here is what I came up with Am I correct 5/2 = EF/JK 5/2 =15/JK 5(JK)=30 JK=30/5 JK=6 Thanks much

45. ## How Children Learn

1. Which of the following is an essential ingredient of academic self-esteem? A. Individual assignments requiring problem solving (me) B. Acceptance by teachers and teacher aides C. Meeting deficiency and growth needs D. A school without grades 2. What

46. ## Calc

The marginal cost of manufacturing x yards of a certain fabric is C′(x)=3−0.01x+0.000006x2 (in dollars per yard). Find the increase in cost if the production level is raised from 3500 to 8500 yards. Increase in cost =

47. ## math

Tyler is thinking of a number that is divisible by 2 and 3. By which of the following numbers must Tyler's number also be divisible? 6? 8? 9? 12?

48. ## math

Manny makes dinner using 1 box of pasta and 1 jar of sauce. If pasta is sold in pckages of 6 boxes and sauce is sold in packages of 3 jars, what is the least number of dinners that Manny can make without any supplies left over?

49. ## Child Development

1) The recording method that's most useful in discovering the causes or results of a child's behavior is A. rating scale. ￼B. time sampling. C. event sampling. D. checklist. 2) One way a teacher can help a child stand up for her rights is A. making other

50. ## Physics - Electric Potential

A charge of - 0.15 C is moved from a position where the electric potential is 13 V to a position where the electric potential is 60 V. What is the change in potential energy of the charge associated with this change in position?

51. ## math

Determine the minimum amount of packaging needed to completely cover a triangular prism toblerone bar with these dimensions: length 22.5cm; triangular face gas edges 4.5cm and height 4.0cm. Express the surface area to the nearest square centimeter.

52. ## Math

A landscaper is preparing a circular flowerbed. The bed has a 12-foot diameter. He will need 13plants per square yard. How many plants should he buy?

53. ## Chemistry

A 0.22-caliber handgun fires a 27-g bullet at a velocity of 765 m/s. Calculate the de Broglie wavelength of the bullet. Is the wave nature of matter significant for bullets?

54. ## Physics

a plane travels 5.0x10^2 m while being accelerated uniformly from rest at the rate of 5.0m/s^2. What final velocity does it attain?

55. ## A&P

Compare ionic, covalent, and hydrogen bonding, and fully describe an example of each. Is this right and I need help with an example of a covalent bond. Ionic bond is formed from one metal and one non metal. It is a solid at room temperate. In an ionic bond

56. ## ENGLISH Literature

In "The Open Window" What does "Romance at short notice was her speciality" means? Does it means that romance was all she had to live by. She had no other interest? Thanks Much!!!! Thank you for using the Jiskha Homework Help Forum. Could it mean she fell

57. ## Literature

Which of the following best describes the shift in the speaker's tone toward Naett? a. from affectionate to proud b. from worshipful to gloating c. from emotional to detached d. from sentimental to concerned

58. ## Maths

30 grams of a breakfast cereal provides 16.2mg of vitamin C. This is 24% of the recommended daily intake. What daily intake of vitamin C is recommended?

59. ## Algebra

1. What is the slope of the line that passes through the points (-2, 5) and (1, 4)? A. -3 B. -2 C. -1/3 D. 1/3 2. A line has a slope -5/3. Through which two points could this line pass? A. (12, 13) and (17, 10) B. (16, 15) and (13, 10) C. (0, 7) and (3,

60. ## geometry

Raul is laying a cement concrete walkway in his backyard. He decides to put a turn of 30° from the horizontal in the walkway to go around a tree and flowerbed. Once he gets past the tree, he wants to continue the walkway in the same direction as before.

61. ## Physics

A stone is catapulted at time t = 0, with an initial velocity of magnitude 18.6 m/s and at an angle of 41.6° above the horizontal. What are the magnitudes of the (a) horizontal and (b) vertical components of its displacement from the catapult site at t =

62. ## Geometry

The sides of a triangle have lengths of 9, 11, and 16 units. What is the perimeter of a similar triangle with its longest side 24 units in length?

63. ## Chemistry

A 100.0 mL sample of a 0.200 molar aqueous solution of K2CrO4 was added to 100.0 mL of a 0.100 molar aqueous solution of BaCl2. The mixture was stirred and the precipitate was collected, dried carefully, and weighed. How many grams of precipitate should be

64. ## Math

Every moment of every day, light pours out from the Sun at the center of our solar system and travels to Earth. It does not arrive at Earth instantaneously though; it takes time to get here. Your task is to figure out how long it takes for light to travel

65. ## Pre algebra

Vernon drew an 8in. Wide by 5in.tall picture that will be turned into a 48 ft wide billboard.How tall will the actual billboard be?

66. ## trig

a lighthouse is located at point A. a ship travels from point B to point C. At point B,, the distance between the ship and the lighthouse is 7.5km. At point C the distance between the ship and the lighthouse is 8.6km. Angle BAC is 58 degrees. Determine the

67. ## Social Studies

The key terms Patroon, Proprietary colony, and Pacifist are described in the history of Pennsylvania but checking for understanding. Does that mean they want me to copy ashort paragraph from the same Pennsylvania subject or write an example from my own

68. ## social studies

I need to write a short paragraph in which i use the following key terms: Patroon, Proprietary colony, Pacifist.

69. ## Math

A children's play area is triangular. The sides of the play area measure 90m, 225m and 255m respectively. Calculate the area of the play area.

70. ## Math

Given the points A(0,0), B(4,3) and C(2,9), what is the measure of

71. ## Math

A ladder is leaned 9m up a wall with its base 5m from the wall. What angle does the ladder make with the ground?

72. ## physics

A +5.0 µC charge is placed at the origin and a -3.9 µC charge is placed at x = 25 cm. At what coordinates can a third charge be placed so that it experiences no net force?

73. ## chemistry homework help!!

many gases are shipped in high pressure containers. consider a steel tank whose volume is 42.0L and which contains O2 gas at a pressure of 165atm at 23 degrees celsius. 1.) what mass of O2 does the tank contain? 2.) what volume would the gas occupy at STP?

74. ## chemistry homework help!!

Dry ice (solid CO2) has occasionally been used as an "explosive" in mining. A hole is drilled, dry ice and a small amount of gunpowder are placed in the hole, a fuse added and the hole plugged. When lit the exploding gunpowder rapidly vaporizes the dry ice

75. ## applying stoichiometry

4.00kg nitrogen dioxide reacts with 1.00kg water to produce nitric acid and nitrogen monoxide. Determine the limiting reactant and the theoretical yield of nitric acid in grams. How many grams of excess reactant are present after the reaction is complete?

76. ## precal 2

use the law of cosines to solve the triangle A=55 degree, c=10, b=3

77. ## food economics

what are the 3 other names by which animal proteins are called?

78. ## algebra

What is the scientific notation for 0.000128?

79. ## geometry

An isosceles right triangle has a hypotenuse of 8 units. What is the length, in units, of one the legs? Round your answer to the nearest hundredth if necessary.

80. ## College English

I'm writing an argument paper on school uniforms. I have wrote a thesis statement and need to have it checked. Any tips to improve would be helpful. Thanks! School uniforms should be required in all public schools because not only do they cut down on the

81. ## chemistry

Identify the ions present in KClO4. The answer is K+ and ClO4- how do you know this?

82. ## Precalculus

If c= 16 and B= 67 degrees, find a.

83. ## chemistry

What is the maximum number of electrons that can occupy the n=4 shell?

84. ## Chemistry (check formula please)

how much energy (in kJ) is required to change the temp of 1.00 kg of Fe from 25.0 degrees celsius to 1515 degrees celsius? the specific heat capacity of iron is 0.449 J/g*K. this is the answer i got. q=(.449)(1.00)(1490)= 669.01 kJ

85. ## chemistry

Automotive antifreeze consists of ethylene glycol, C2H6O2, a nonvolatile electrolyte. Calculate the boiling point and freezing point of a 25.0 mass percent of ethylene glycol in solution.

86. ## Chemistry

The chemical 5-amino-2,3-dihydro-1,4-phthalazinedione, better known as luminol, is used by forensic scientists in analyzing crime scenes for the presence of washed-away blood. Luminol is so sensitive that it can detect blood that has been diluted 10,000

87. ## Epidemiology

Which of the following six study design types most appropriately characterizes the studies described below (#1-6)? DESIGN TYPES a. Cross-sectional b. Case-control c. Prospective cohort d. Retrospective (historical) cohort e. Clinical trial f. Community

88. ## English

Hi, I'm in need of some help with the poem "Marvell's garden" by Phyllis Web. I'm stuck on what the tone of the poem? and having trouble interpreting the first two stanzas.

89. ## ALGEBRA 1

Use inductive reasoning to predict the next Number in each sequence. 1.3,7,11,15... i figure this to be 19 because each number following the first is a difference of 4. 2. 1,-2,4,-8 this is abit difficult for me. I am guessing the answer tobe 10. I

90. ## Geometry

Find the midpoint of M of the line segment joining the points C=(3,-7) and D=(-1,1)

91. ## Algebra

34 is 6 less than 5 times a number

92. ## math- study question for final

You are given a sample of 106 body temperatures having a mean of 98.2 F and a standard deviation of 0.62 F. You are asked to test the hypothesis that the population mean body temperature is 98.6 F using a 0.05 significance level. What value should you use

93. ## Physics-Conservation of Momentum

3. A train loaded with steel, moving at 90km/h, collides head on with a stationary train of mass 6000kg. if the trains couple after collision and move forward with a velocity of 80km/h, find the mass of the train loaded with steel. My work so far: PTO=PTF

94. ## Physics

2. Saturn has a radius of about 9.0 earth radii, and a mass 95 times the Earth’s mass. Estimate the gravitational field on the surface of Saturn compared to that on the Earth. Show your work. Answer: g= GM/r² G= 6.67 * 10^-11 Nm²/kg² ME= 5.98 * 10^24

95. ## Language Arts

Which of the following correctly revises the the sentence so that it is entirely in active voice? A. It has been decided by the school at the regular teacher should not evaluate the class; instead, the assessment should be performed by a visiting scholar.

96. ## chemistry

How many grams of oxygen gas must react to give 2.70g of ZnO? 2Zn(s)+O2(g)→2ZnO(s)

97. ## global history

to what extent are studies in the arts important to the success of a renaissance man?

98. ## Calculus

The manager of a large apartment complex knows from experience that 80 units will be occupied if the rent is 460 dollars per month. A market survey suggests that, on the average, one additional unit will remain vacant for each 10 dollar increase in rent.