GRACE

Most popular questions and responses by GRACE
1. Statistics

Suppose a basketball player is an excellent free throw shooter and makes 90% of his free throws (i.e., he has a 90% chance of making a single free throw). Assume that free throw shots are independent of one another. Suppose this player gets to shoot three

2. Science

1.If an animal is an ectotherm, It has? A. A skeleton on the outside of its body B. A skeleton on the inside of its body C. A body that regulates its own internal temperature D. A body that does not produce much internal heat

3. Chemistry

FeSCN2+ -> Fe3+ + SCN- Solution is initially dark red. If some Ag+ is added to form AgSCN. what happens to position of equilibrium? what happens ot the color?

4. Trigonometry

How do I find all solutions to: tanx+3cotx=4? The answer choices are: a.) x=arctan3+nPi b.) x=arccot3+nPi

5. Chem

Write the formulas of the compounds formed by Pb4+ with the following anions: CN−, ClO3−, SO42−, H2PO4−.

6. Physics

Two cars travel westward along a straight highway, one at a constant velocity of 85 km/hr, and the other at a constant velocity of 115 km/hr. a) Sketch the velocity vs. time graph for both cars and paste your sketch in the space below. b) Assuming both

7. math

Given: ∆PQR, m∠R = 90° m∠PQR = 75° M ∈ PR , MP = 18 m∠MQR = 60° Find: RQ

8. Chemistry

Write a balanced chemical equation that represents the self-ionization of water. (Use the lowest possible coefficients. Include states-of-matter at 1 atm and 25°C in your answer.)

9. Statistics

A national caterer determined that 87% of the people who sampled their food said that it was delicious. A random sample of 144 people is obtained from a population of 5000. The 144 people are asked to sample the caterer's food. If sample proportion, P^, is

10. Language Arts

What does the aunt in The Story Teller find improper about the bachelor's story? A. It makes fun of Bertha's goodness B. It has too many fantasy elements C. It unrealistically suggests that virtue is always rewarded D. The bachelor tells it without

11. Math

You flip a coin 30 times and get heads 11 times, so the chance of getting heads is 11\30. Is this an example of theoretical or experimental probability? A. Theoretical B. Experimental Is the answer B? Thank you

12. Chemistry

An AM station broadcasts rock music at "950 on your radio dial" Units for AM frequencies are given in kilhertz(kHz). Find the wavelength of the station's radio waves in meters, nanometers, and angstroms.

Which of the following fossil types is best described as forming when minerals replace all or part of an organism's body? A) A mold B) A petrified fossil*** C) A cast D) A trace fossil

14. Physics

You're driving parallel to train tracks at 40.0 km/h when a train passes you, going a steady 105 km/h. A track crossing is up ahead, so you begin to speed up at 6.50 m/s2. How far do you drive before you pass the train?

15. world history

What was a major cause for the Third Italian War of Independence? the border disputes with France and later with Prussia the simultaneous attack of Austria by Prussia and Italy in 1866 the desire to create a vast Italian empire in central Europe C?

16. history

Which options describe Chinese developments in mathematics? (Select all that apply.) A- The first Chinese book about mathematics, Nine Chapters on the Mathematical Art, was composed before 200 BC. B- The Chinese discovered the ratio of a circle’s

17. chemistry

a 2.52-g sample of a compound containing only carbon, hydrogen, nitrogen, oxygen, and sulfur was burned in excess O to yield 4.23 g of CO2 and 1.01 g of H2O as the only carbon and hydrogen containing products respectively. Another sample of the same

18. Operations Management

Consider the following system: -> 0.73 -> 0.73 -> Determine the probability that the system will operate under each of these conditions: (Round your final answers to 4 decimal places, not your intermediate calculations.) a.) The system as shown b.) Each

19. Chemistry

What is the Wavelength( in nm) of the least energetic spectral line in the infrared series of the H atom? I don't understand how to find the least energetic spectral line?

20. history

Which best describes how Sparta’s culture influenced the city-state’s government? A- Sparta was a society based on exploration and expansion, and its government was also based on this concept. B- Sparta was a society based on being prepared for war,

21. Help! Communication

HELP!!! effective verbal message formation is about being. 1) Supportive of others 2) Critical of the motives of others 3) informed about a decision process 4) intentional in one's learning. I think the answer is 2 but i'm not sure.

22. history

explain the relationship of Spindletop's location in Texas to it's importance on the economic development of Texas and the United States.

23. Biochemistry

Calculate the ph of a 1L solution to wgich has been added 25ml of 10mM acetic acid and 25ml of 30mM sodium acetate

24. Physics

A 45 kg crate is placed on an inclined ramp. When the angle the ramp makes with the horizontal is increased to 29 degrees, the crate begins to slide downward. What is the coefficient of static friction between the crate and the ramp? At what angle does the

Bryan has 3 nickels, 3 dimes, and 2 quarters. What fraction of the coins is either a dime or a quarter? There is a space for only 1 fraction answer.

26. Physics

A man uses a lever jack to lift a 2.00 × 10^3 kg car to change a tire. Each stroke of the jack lifts the car a distance of 5.00 × 10^(-3) m. The vertical displacement of the handle is 0.75 m for each stroke. How much total force does he use with each

27. math

Water is being poured into a conical cup that is 12cm tall. a) When the water in the cup is 9cm deep, what percentage of the cup is filled? b) When the cup is 75 percent filled, how deep is the water?

28. History

What was the importance of the inclusion of the bill of rights in the constitution? a.It limited the power and controls the government b.It guaranteed the protection of basic rights c.it improve U.S relations with the british monarchy d.it proposed a

29. Language Arts

What does the word conviction mean in this sentence? His voice rang with great conviction as he told us his ideas. A)Anger B)Certainty C)Confusion D)Sorrow

30. Chemistry

In 1901, Thomas Edison invented the nickel-iron battery. The follwing reaction takes place in the battery. Fe(s) + 2 NiO(OH)(s) + 2 H2O(l) Fe(OH)2(s) + 2 Ni(OH)2(aq) How many mole of Fe(OH)2, is produced when 3.70 mol Fe and 6.95 mol NiO(OH) react?

31. math

Without using a calculator, choose (a) the larger of cos 40 and cos 50; (b) the larger of sin 40 and sin 50. Be prepared to explain your reasoning.

32. Math

Suppose you write the letters M-I-S-S-I-S-S-I-P-P-I on cards and mix them in a hat. You choose one card from the hat without looking. What is the probability of picking an S? A.4\11 B.2\11 C.4\7 D.7\4 Is the answer A? Thank you

33. Math

You roll a pair of number cubes and then flip a coin. Is this an example of independent or dependent events? A. Independent B. Dependent Is the answer A? Thank you

34. Physics

A cardboard box of unknown mass is sliding upon a mythical frictionless surface. The box has a velocity of 4.56 m/s when it encounters a bit of friction. After sliding 0.700m, the box has a velocity of 3.33 m/s. What is the coefficient of friction of the

35. social studies

1. Many agree that Native Americans migrated from Asia as early as _______ years ago. (1 point) 2,000 5,000* 30,000 100,000 2. What country controlled the majority of the Americas in 1783? (1 point) Great Britain* France Spain Native American 3. The Treaty

36. chemistry

1.How many atoms are in a sample of copper with a mass of 18.46 grams? 2.How many formula units are in a sample of salt with a mass of 67.69 grams? 3.How many molecules are in a sample of water with a mass of 44.99 grams? 4.What is the mass in grams of

37. Geography

Which scenario accurately depicts a way that maps are used as a reference tool? A. A shopper consults a map to discern the best route to a new store. B. A teacher displays a map to point out the name of a local mountain. C. A student consults a map to

38. chemistry

8.What is the mass of 4.56 moles of sulfur dioxide? 9.What is the mass of 4.56 molecules of sulfur dioxide? 10.How many formula units are in 0.456 grams of Ca3(PO4)2? 11.How many moles are in 1.5 x 10 ^23 atoms of fluorine? 12.What is the mass of 2.80 x 10

39. Geometry

The coordinates of the vertices of △ABC are A(1,4), B(-2,-1), and C(-3,-2). The height h to side BC is √2, and b is the length of BC. What is the area of △ABC? I don't really know how to approach or start this problem, so if you can help, please do!

40. riddle

Its new and old at the same time

41. Math

Suppose you write the letters M-I-S-S-I-S-S-I-P-P-I on cards and mix them in a hat. You choose one card from the hat without looking. What is the probability of picking a P? A.4\11 B.2\11 C.4\7 D.7\4 Is the answer B? Thank you

42. maths

The mass of a particular substance is known to grow exponentially at a rate of 0.5% per hour. Its initial mass was 25 grams and, after t hours, it weighed 31 grams. The equation modelling this growth is 25×1.005 t  =  31. Use the method of

43. math

how is finding a fractional part of a set different than finding a fractional part of a whole?

44. Physics

A 2260kg truck drives East with a constant velocity of 18m/s. It comes to a stop after traveling 123m. What is the noraml force exerted by the road on the truck? Also, is the distance travelled essential to solve the problem or is unnecessary information?

45. math

Sasha has 8 red apples. She has 3 fewer green apples than red apples. How many apples does she have? 13 apples 8-3=5 green 8+5=13

46. CHEMISTRY

The specific heat capacity (cp) of lead is 0.13 J/g °C. How much heat (in J) is required to raise the temperature of 15 grams of lead from 22 °C to 37 °C? a. 2.0 b. -0.13 c. 0.13 d. 29

47. Science

What has the study of fossils allowed scientists to do? A) Describe the past environments and the history of life. B) Study present ocean temperatures at different depths C) Analyze the chemical compositions of sedimentary rocks and minerals. *** D)

48. Chemistry

Possible Sources of error in a reaction or sodium bicarbonate and acetic acid. Also known as baking soda and vinegar.

49. Chemistry

Covalent bonds in a molecule absorb radiation in the IR region and vibrate at characteristic frequencies. a) The C---O bond absorbs radiation of wavelength 9.6um. What frequency (in s-1) corresponds to that wavelength? b) The H---Cl bond has a frequency of

50. Computer Science

The compare_and_swap() instruction (CAS) can be used to design lock-free data structures such as stacks, queues, and lists. The program example shown below presents a possible solution to a lock-free stack using CAS instructions, where the stack is

51. Math

A lighthouse is east of a Coast Guard patrol boat. The Coast Guard station is 20 km north of the lighthouse. The radar officer aboard the boat measures the angle between the lighthouse and the station to be 23°. How far is the boat from the station?

52. math

third degree with zeros of 2-i,2+i and 2 and a leading coefficient of 4. Construct a polynomial function with stated properties

53. physics

Two large horizontal metal plates are separated by 4mm. The lower plate is at a potential of (-)6v.What potential should be applied to the upper plate to create field strength of 4000v/m upwards in the space between the

54. chemistry

when aqueous solutions of copper II nitrate and sodium phosphate are mixed, sodium nitrate and copper II phosphate are formed. In the balanced chemical equation what is the coefficient of sodium nitrate?

55. math

A certain store is selling an \$80 radio \$64. If a different radio had a list price of \$200 and was discounted at 1.5 times the percent discount on the \$80 model, what would its selling price be? a) \$90 b) \$105 c) \$120 d) \$140 e) \$160

56. Physics

An engineer is designing a runway for an airport. Several planes will use the runway and the engineer must design it so that it is long enough for the largest planes to become airborne before the runway ends. The largest plane accelerates at 3.30 m/s2 and

57. Physics

Hi, the following is a problem that concerns angular momentum: Modern hard drives spin very fast! The part that holds the data is a disk called the platter. Assume an aluminum platter that is 3.5in. in diameter, 1mm thick, and spinning at 5400 rpm. Treat

58. algebra

The ordered pairs (1, 81), (2, 100), (3, 121), (4, 144), and (5, 169) represent a function. What is a rule that represents this function?

59. Physics

A person runs off a 10.0-meter high balcony in a horizontal direction at 5.0 m/s. The swimming pool is at ground level 5.5 meters away from the edge of the balcony. Will the person reach the pool? Assume no air resistance. *I'm having trouble with this

60. Math

You have made 3 out of 10 of your last free throws. How many free throws can you expect to make if you shoot 100 free throws? A.30 B.50 C.60 D.75 Is the answer A? Thank you

61. Chemistry

How do I do the empirical formula for 37.01% carbon, 2.22% hydrogen, 18.50% nitrogen, and 42.27% oxygen? My teacher gave me the answer (C7H5N3O6), but I can never get that answer.

62. physics

If the grating is not properly aligned, what are the consequences on the average angular displacement and wvelength reading? Please elaborate. How do grating constants affect the observed spectral lines?

63. science

which of the following does not change when a car keeps a constant speed but changes direction

64. Math - for Reiny

Mandy finds she can get a discount on corn cobs if she buys in bulk. She can get 100 kilograms of corn cobs for \$160 from Matt, on condition that she buys at least 100 kilograms. From another supplier, Robert, she can buy small quantities of corn cobs (100

65. MATH

A food snack manufacturer samples 15 bags of pretzels off the assembly line and weighed their contents.If the sample mean is 10.0 and the sample standard deviation is 0.15, find the 95% confidence interval of the true mean.

66. Languagd Arts

Which of the following is the best reason to use visuals in a research presentation? A. To illustrate your main point in an engaging manner. B. To illustrate any topic with data in percentages. C. To show different ways of looking at the same information.

67. Differential calculus

A gutter with trapezoidal cross section is to be made from a long sheet of tin 8 in wide by turning up one third of its width on each side , what width a cross the top that will give a maximum capacity

68. Chemistry

When copper(II) oxide is heated in the presence of hydrogen gas, elemental copper and water are produced. What mass of copper can be obtained if 34.0 g copper(II) oxide is used?

69. Science

Does anyone know why does climate/water movement cause some parts of the ocean to be saltier than others? I'm stuck. Are there multiple ways?

70. math

What is the volume of the cone in the picture if S = 5 and R = 3?

71. St paul's university

A sample of 200 voters revealed the following about the three candidates A,B and C.28 were in favour of both A and B.98 in favour of A or B but not C.42 in favour of B but not C or A.122 in favour of B or C but not A.64 in favour of C but not A or B.14 in

72. Science (Chemistry)

2. Perform this operation and report the answer to the correct number of significant figures: What is the mass of a cube of aluminum that is 4.0 cm on each edge? The density of aluminum is 2.7 g/cm^3. Show all calculations leading to an answer. (I think I

73. Math

There are 24 students in Mrs.Smith's 1st block class. 1/4 of the class passed the math test with an A. 12 students in the class passed the math test with a B. What percent of the students in the class passed the test? ****** This is how I slove the

74. Math

By letting x=5^y, show that the equation p5^y + 5^-y = 5 can also be written as px^2-5x+1 = 0

75. chemistry

Why is it necessary to wait until the filter paper containing a compound is completely dry before weighing it? and how would it effect the theoretical yield? HIgher?? lower??

76. Physics

Sputnik, the first artificial satellite to orbit the Earth, had a mass of 83.6kg and travelled at 7574 m/s. The radius of the earth is 6371 km and its mass is 5.972 x 10^24 kg. What gravitational force did Sputnik apply to the earth during this orbit? What

77. math

Later 7 students joined group 2 (41 students)and one student left to join group 1. (44 students) Now 20 students play trombone and 7 more students play trumpet as play saxophone. How many students play each instrument?

78. Chemistry

Suppose a saturated solution of barium fluoride contains 1.5 x 10 ^ -2 M of F-. What is the Ksp of BaF2. I know that the balanced equation of this reaction is: BaF2 (s) --> Ba2+ (aq) + 2F- (aq) There is a 1:1 ratio between BaF2 and Ba2+ and there is a 1:2

79. Language Arts

What is the most important reason for using multiple sources in a research presentation? A. So you include primary and secondary sources. B. So you have experience conducting original research. C. So you know that the information is accurate. D. So you use

80. algebra

TGIF. Chris and Terry have been trying to live within their budget but miss going out to dinner on Friday nights. They decide not to spend any nickels or quarters they receive as change for a month and save these in a jar. At the end of the second week

81. AP Human Geography

Without a scale on a map, A. many details must be omitted. B. only global trends can be captured. C. regional details can be captured, but larger details must be omitted. D. viewers cannot tell how much area on Earth is represented on the map. E. viewers

82. CHEMISTRY

The major component of vinegar is acetic acid CH3COOH. Which of the following reactions represents the balanced equation between acetic acid and sodium bicarbonate? a. CH3COOH(aq) + NaHCO3 a CH3COONa(aq) + CO2(g) + H2O(I) b. CH3COOH(aq) + 2 NaHCO3(aq) +

83. Physics

Movers are looking to lower a cabinet out of an open window to a mattress on the ground below. One end of a rope is tied to a 188 kg dresser, looped through a pulley, and the other end of the rope is tied to a cabinet. If the coefficient of kinetic

84. Physics

A wind turbine rotates at 8.40 rpm and has an angular acceleration of 0.0326 rad/s2. If the wind turbine takes 27.0 s to come to a complete stop, how many revolutions will this take?

85. Geometry

What is the scale factor of a dilation centered at the origin that maps the point (12, -8) to the point (-7.2, 4.8)? Please show work as it will help me better understand, thanks so much!

86. Math

While mixing a light green paint, Luke mixes 35% blue paint and the rest is yellow. The green paint fills up two fifths of a litre container. Still thinking it needs to be a lighter green how much more yellow paint must be added to make the yellow paint

87. Math

What is the Distributive Property?

88. Chemistry

What are the molality and mole fraction of solute in a 32.3 percent by mass aqueous solution of methanol (CH3OH)? molality = ?m mole fraction =

89. Physics

A uniform ladder of 5.0 m long and 12 kg is leaning against the wall (contact with the wall = point b, contact with the floor = point a). The height from the ground to point b is 4m . The wall is frictionless but the floor is not. A painter of 55 kg climbs

90. Science (Chemistry)

The Average density of Earth is 5.52g/cm^3. What is its density in a. kg/m^3 b. lb/ft^3. Please help me set up these equations. Thank you!

91. Geometry

If AD=27, AC=2x, BC=3, and BD=x, what is x?

92. Physics...Help!!!

given that Earth's surface gravitaitional field strength has a magnitude of 9.80N/kg, determine the distance(as a multiple of Earth's radius re) above the Earth's surface at which the magnitude of the field strength is 3.20N/kg.

93. math

al has twice as many baseball cards as frank and four times as many football cards as joe. the expression 2x+4y can be used to show the total number of baseball and football cards Al has. If the answer is y, then what is the question?

94. physics

A proton moves at a speed of 5.9 × 107 m/s at right angles to a magnetic field with a magnitude of 0.095 T. Find the magnitude of the acceleration of the proton. Answer in units of m/s 2 .

95. Math help ❤️

An angel measures 53°. What are the measures of the angles comp meant and supplement? A) Comlement, 37°; supplement, 137° B) Complement, 127°; supplement, 47° C) Complement, 37°; supplement, 127° D) Complement, 127°; supplement, 37° Please help me

96. Social Studies

What was the Peloponnesian war? Please check my answer :) A) A conflict between Greece and Persia B) A conflict between Athens and Sparta (my answer) C) A conflict between Greece and Macedonia D) A conflict between Macedonia and Athens Please help me my

97. physics

An electron in a vacuum is first accelerated by a voltage of 15600 V and then enters a region in which there is a uniform magnetic field of 0.689 T at right angles to the direction of the electron’s motion. What is the force on the electron due to the

98. math

Suburban Population. The following charts show the populations for two suburbs from 1980 to 1990, where x = 0 correspond to 1980, x = 2 correspond to 1982, and so on. Year x Suburb 1 y Year x Suburb 2 y 0 12,690 0 23,112 2 12,071 2 23,893 4 13,463 4 24,674