# Don

Popular questions and responses by Don
1. ## Physic

A 3.5 kg block is pushed along a horizontal floor by a force of magnitude 15 N at an angle è = 40° with the horizontal. The coefficient of kinetic friction between the block and the floor is 0.25. Calculate the magnitudes of (a) the frictional force on

2. ## Math C30

Equations containing circular functions and unit circle... solve 2cosx sinx + sinx = 0

3. ## Technology

To insert clip art into a document, what step should I take immediately after i find the clip art I want to insert? a. Use scroll bars to view more choices of clipart. b. Click on the clip art image. c. Click on the clip art button. d. Click insert tab at

4. ## math

you download 12 new songs to your mp3 player. then you delete 5 old songs.. write each amount as an integer?

5. ## easy math

What value of c makes x^2 + 6x + c a perfect square trinomial? 3 6 9 12

6. ## Math

Start at 5. Create a pattern that adds 3 to each number. Stop when you have 5 numbers.

7. ## Calculus 3

In the methane molecule, each carbon atom is surrounded by four hydrogen atoms, which form a tetrahedron, with the carbon atom at its center. The bond angle theta is the angle formed by the H-C-H combination. Find the tetrahedron angle theta. Take the C

8. ## Algebra

Write an equation of the line satisfying the given conditions. Vertical line through (6, -6)

9. ## Physics

Two banked curves have the same radius. Curve A is banked at an angle of 11°, and curve B is banked at an angle of 16°. A car can travel around curve A without relying on friction at a speed of 18.5 m/s. At what speed can this car travel around curve B

10. ## physics 30

an object is thrown from 1.5m above the ground with a velocity of 15m/s and at an angle of 25deg with the ground. using vectors and motion equations, determine how long the object will remain in the air before returning to the ground. ARGHHHHHH help

11. ## MATH C30

How to find the amplitude, period, phase shift, vertical shift, and the equation of the primary function of the function: y = -cot(1/3x - pi/6) how to find where the period begins and ends

12. ## Probabilities

A queen on an English chessboard is able to attack in the same row, column and diagonal. The probability that 2 randomly placed queens on an 8 by 8 chessboard will be able to attack each other can be expressed as a/b , where a and b are positive, coprime

13. ## mathURGENT!!!!!!!!!!

find all ordered pairs of positive integers (x,y) that satisfy the following equation: x^y=2^64. please answer and explain how you got it!!!!

14. ## chem

2 NO(g) + O2(g) 2 NO2(g) For the reaction above tell whether the reaction would shift to the left (L) or right ® if I a. Increased the total pressure of the system b. Removed O2 from the system c. Increased the amount of NO in the system

15. ## Physics

A student (m = 63 kg) falls freely from rest and strikes the ground. During the collision with the ground, he comes to rest in a time of 0.0120 s. The average force exerted on him by the ground is +17000. N, where the upward direction is taken to be the

16. ## math

how to write 9.035 in expanded notation

17. ## Discete Math

Show that there must be at least 90 ways to choose six integers from 1 to 15 so that all choices have the same sum.

18. ## Trig

Prove that the equation is an identity: cot4theta - csc4theta = -cot sq theta - csc sq theta How ??

If one company(A) owns another company(B) and Company B owns a third company (C) is it safe to say that Company A owns part of Company C? A real life example is the sports media group TSN is 20% owned by ESPN. ESPN is then in turn 80% owned by The Walt

20. ## Chemistry

Instant cold packs used to treat athletic injuries contain solid NH4NO3 and a pouch of water. When the pack is squeezed, the pouch breaks and the solid dissolves, lowering the temperature because of the following endothermic reaction. NH4NO3(s) + H2O(l) =

21. ## Chemistry (electron config)

Write electron configurations for the following ions. Tl^+ [Xe]4f^145d^8 is that correct?

22. ## Chemistry

Write balanced equations for the following reactions. Express your answer as a chemical equation. Identify all of the phases in your answer. 1. chromium (III) oxide with dilute hydrochloric acid A: Cr2O3 (s) + 6HCl (aq) ---> 2CrCl3 (s) + 3H20(l) (my phases

23. ## Algebra

Use the discriminant to determine how many real number solutions the equation has. t^2 + 8t + 16 = 0

24. ## Algebra

A certain kind of animal weighs about 71 pounds at birth and gains about 2 pounds per day for the first few weeks. Determine those days for which the animal's weighs more than 117 pounds. The animal's weight is more than 117 pounds when the animal is more

25. ## Math

What is the rule for adding or subtracting fractions?

26. ## Algebra

A roof truss is in the shape of a triangle with height of x feet and a base of 2x + 1 feet. Write a polynomial A (x) that represents the area of the triangle. Find A (5).

27. ## rounding numbers

I need to to round 423,607,492 to the ten thousands. I then need to round it to the million. Can someone help me. I will be happy to check your work. Which numeral is in the ten-thousand place in this number? Which numeral is in the million place? Once you

28. ## probability

the probability of winning a carnival game is 15%. Elaine plays 10 times. find the probability that Elaine will win 2 times.

1. Which of the following shows how this expression can be simplified? 2x + 6 + 3x − 4 A. x − 2 B. x + 2 C. 5x + 2 D. 5x − 2 2. Which is equivalent to the expression below? 7(2p − 1) A. 7p B. 14p − 1 C. 14p − 7 D. 14p − 8 3. Factor the

30. ## physics

A car covers half a distance at a velocity of 80km/h and the other half at 60km/h,what is the average velocity of the car?

31. ## English **One Question**

In a sense we have come to our nation's capital to cash a check. When the architects of our republic wrote the magnificent words of the Constitution and the Declaration of Independence, they were signing a promissory note to which every American was to

32. ## Math

The college president asks the statistics teacher to estimate the average age of the students at their college. How large a sample is necessary? The statistics teacher decides the estimate should be accurate within half year and be 92% confident. From a

33. ## Math

Simplify the following expressions by using trigonometric form and De Moivre's theorem a. (√3-i)^4 b. (-4+4i√3)^5 c.(2+3i)^4 d. (4-i)^6

34. ## MATHS STATISTICS

B. A soft-drink vending machine is supposed to pour 8 ounces of the drink into a paper cup. However, the actual amount poured into a cup varies. The amount poured into a cup follows a normal distribution with a mean that can be set to any desired amount by

35. ## math

A telephone pole is 55 feet tall. Jeri stands in the shadow of the pole. She is 66 inches tall, gut her shadow is 12 feet long. How far away from the telephone pole is she standing.

36. ## calculus

I need help with this problem: The path traveled by a golf ball with a 9-iron can be modeled with the quadratic equation, y= -0.042xsquared + 5x, where x is the distance in yards from the point it was hit and y is the height of the golf ball in feet.

37. ## Physics

Two tiny conducting spheres are identical and carry charges of -19.8 µC and +54.5 µC. They are separated by a distance of 2.45 cm. (a) What is the magnitude of the force that each sphere experiences, and is the force attractive or repulsive? 1 N 2

38. ## chem 1

if 58.44 g of sodium chloride is dissolved in 0.5 liter of water what is the molarity of the sodium chloride solution? The molar mass of sodium chloride is 58.44 grams per mole.

39. ## Physics

During a storm, a tree limb breaks off and comes to rest across a barbed wire fence at a point that is not in the middle between two fence posts. The limb exerts a downward force of 148 N on the wire. The left section of the wire makes an angle of 12°

40. ## geometry

if AB=CD, AB is 12-y, CD = 3x-4y, BD = 18, AC = x+y, what is x, y, and AC

41. ## math

6 builders worked 8 hours a day for 10 days to complete a job.If 8 builders worked 6 hours a day for 3 days,the remaining work has to be completed by 6 builders in 8 days.How many hours does each builder need to work each day?

42. ## math

the day is 1hour 18minutes longer than the night.how long is the day?

43. ## Physics

An electric drill operates at a potential difference of 120V and draws a current of 1.5 Amps. If it takes 50 seconds to drill a hole in a piece of steel,calculate the amount of electrical energy used by the drill in that time.

44. ## Physics 30

a 2000kg car traveling east at 24m/sec enters an icy (frictionless) intersection and collides with a 3600kg truck traveling south at 10 m/sec. If they become coupled together in the collision, what is their velocity immediately after impact?

45. ## algebra

if the red river is 500 miles longer than the blue river. if the sum of their lengths is 5550 miles what is the length of each river

46. ## Math

Fred runs a lap every 2 minutes and Mark runs a lap every 2.5 minutes. They start together. How long will it be before they are next to each other again?

47. ## Trig

Rewrite tan 88 deg in terms of its cofunction How does that end up????

48. ## Programming

2. Then it should prompt the user for the input file name of the file containing the data to sort. 3. If the program can't open the file or if no file name is entered (^d or ^z is entered for EOF), it should print an error message and exit. 4. The file

49. ## Chem

a container of 2.00 moles of an ideal gas as 1000 K undergoes a constant pressure and volume process in which the number of moles is increased to 5moles. what is the final temperature of the gas. How do I start this? Do I somehow use the ideal gas law?

50. ## Calculus

Use Newton's Method with the function f(x)=x^2-2 and initial value Xo=2 to calculate x1,x2,x3. I have no idea how to do this

51. ## Chemistry

Arrange the following atoms in order of increasing effective nuclear charge experienced by the electrons in the n = 3 electron shell: K,Mg,P,Rh,and Ti. I think that the effective nuclear charge increases as you go up a group and across a period. so Rh, K,

52. ## Chemistry

Arrange the following atoms in order of increasing effective nuclear charge experienced by the electrons in the n = 3 electron shell: K,Mg,P,Rh,and Ti. I think that the effective nuclear charge increases as you go up a group and across a period. so Rh, K,

53. ## Math

Anyone know about how much a button weighs in mg?

54. ## Geometry

If the surface area of a sphere decreases, will the value of the volume remain the same?

55. ## Physics

your friend says that the equivalent (combined) resistance of resistors connected in series is always more than the resistance of the largest resistor. Dou you agree?

56. ## physics

A spaceship is observed traveling in the positive x direction with a speed of 150m/s when it begins accelerating at a constant rate. The spaceship is observed 25s later traveling with an instantaneous velocity of 1500m/s at an angle of 55 degrees above the

57. ## history

How does the supreme court show that the constitution allows congress to exercise the power to regulate commerce within a state?

58. ## math

I need help with write the equation of the line which contains the point (0,negavtive 3), or written ars(0, -3) and whose slope is 4. if you want the equation in the form y = mx + b sub in -3 for y, 4 for m, and 0 for x for -3 = 4(0) + b so b = -3

59. ## Maths

PLEASE HELP ME!! The diagram shows the position of three airports . A,E and G. G is 200 kilometers from A, E is 160 kilometers from A, From G the bearing of A is 052 degrees, From A the bearing of E is 216 degrees. How far apart are airports G and E?

60. ## algebra

74=6-h=qx=5=6.09009(0)=_______

61. ## physics

A box is pushed a distance of 2 m with a force of 20 N. How much work is done on the box?

62. ## Calculus

Let f(x)= (x^2 -4)/(x-2) and note that lim as x approaches 2 , f(x)=4. For each value of E, use a graphing utility to find all values whenever 00, make a conjecture about the value of delta S that satisfies the preceding inequality. How would you do this

63. ## CHEMISTRY

A(aq) + B(aq) + C(aq) → D(aq) [A]. [B]. Rate (mol) 0.01 0.02 0.0005 0.02 0.02 0.0010 0.01 0.04 0.0020 Determine : a) The order of the reaction of each reactant b) The rate law c) The rate constant K, Using result from experiment 1. Please working answers

64. ## Earth science

If a sample contains 50g of carbon 14 and 50g of nitrogen 14 , how many lives has it undergone ?

65. ## Earth science

If a sample contains 50g of carbon 14 and 50g of nitrogen 14 , how many lives has it undergone ?

66. ## Physics

Jason while driving on Kukum highway at 70 m.s – 1 seeing the traffic light turn red, he applies the brake and comes to rest in a time of 2 seconds. What is his deceleration?

67. ## Math

How do you write ln(n) in log form? I know that you can convert log of some base by doing ln of the variable over ln of the base, but I don't know how to do the opposite.

68. ## math

Anna has \$15 more than Lala does. If I gave Lala \$60, she will have three times as much as Anna. Find how much Lala has at the first place?

69. ## math

5 apples costs 7 kg. Let x be the cost of 7 apples, make an equation to find out the cost of 7 apples

70. ## Algebra

Six times a number less ten is equal to two times the same number plus four.

71. ## Finance

Ron starts with a \$100,000 mortgage at 8% for 30 years, annual payments. Ten year into the mortgage Ron is able to refinance the balance of the mortgage at 6%. a) If he chooses to refinance for 20 years what would his new payments be?

72. ## Finance

Ron starts with a \$100,000 mortgage at 8% for 30 years, annual payments. Ten year into the mortgage Ron is able to refinance the balance of the mortgage at 6%. a) If he chooses to refinance for 20 years what would his new payments be?

73. ## Maths

Four numbers 2, -3, 5 and -7 are arranged in a pattern as shown. 2, -3, 5, -7, 2, -3, 5, -7, 2, -3 .......... what is the 2005 number?

74. ## Math

Bakery salary \$24,000 Kitchen salary \$26,000 Catering salary \$30,000 Bar salary \$30,000 Server/host \$25,000 What department has the largest difference between the highest and lowest employee

75. ## Math

Number of employees in Kitchen is 2 Salary is \$52,000 Avg. cost of employee 26 If the avg. cost per salaried employee increase by \$4,000 in the kitchen department, what is the new average cost per employee in the department

76. ## Language

What word means the opposite of offensive Affable Zealous Acclivitous Intimate Synergetic

77. ## Math

100(1+100) Example : 1+2+3+…+100= ----------- 2 Simplify: (x+1) + 2(x+1)+ …+1000(x+1)

78. ## English

It is not from the benevolence of the butcher the rewer, or the baker, that we expect our dinner, but from their regard to their own interest.

79. ## math

If you place \$2,000.00 in a saving account with an interest rate of 4.5% month versus an account with a rate of 3.75% month, how much more interest could you earn in that month using the first account?

80. ## FIN 301

1. Cliff Arthur has equally attractive job offers in Miami and Los Angeles. The rent ratios in the cities are 8 and 20, respectively. Cliff would really like to buy rather than rent a home after he moves. Explain how to interpret the rent ration and what

81. ## Physics

a 475 kg pre-stressed concrete beam is to be raised 10.0 m in 24.0 s. how many kw of power is needed to for the job

82. ## physics

Show that the kinetic energy of two particles with mass m1 and m2 split into the energy of the centre of mass and the kinetic energy of relative motion.

83. ## English LAST 1. (:

It's about MLk I Have A Dream speech. Why does King use the rhetorical technique of parallel structure in his speech? A)to show that he is aware of the time that has passed B)to show that others are not aware of the time that has passed C)to show that two

84. ## Market Research

Let N  6 and n  3. For purpose of studying sampling distributions, assume that all population values are known. Specically, y1  98, y2  102, y3  154, y4  133, y5  190, and y6  175. We are interested in yU, the population mean. Two sampling plan

85. ## algebra

A three quarter inch wire has 12 ohms resistance. How much resistance has the same length of half-inch wire, if resistance varies inversely as the square of the diameter?

86. ## English

What is a metaphor for a deep voice?

87. ## Math homework help

Check out the polar coordinate pairs that label the same point. Several pairs may be possible. A) (2, 2pi/3) B) (2, -pi/3) C) (-3, pi) D) (2, 7pi/3) E) (3,0) F) (-3,0) G) (-2, -pi/3) H) -3, 2pi)

2+11b=8b+15

89. ## DISCRETE MATHS

Prove that if n is an odd positive integer, then 1 ≡ n2 (mod 4).

90. ## DISCRETE MATHS

Use the Euclidean Algorithm to find gcd(112,15)

91. ## DISCRETE MATHS

What is the cardinality of this set? {p, {p}, {p, {p}}} my answer is 1. is it right?

92. ## pre-calculus

Move point (3,50 degrees) according to the following symmetries (keep positive) a. symmetrical to the origin b. symmetrical to theta=0 degrees c. symmetrical to theta= 90 degrees

A. The GPAs of all 5540 students enrolled at a University have an approximately normal distribution with a mean of 3.02 and a standard deviation of 0.29. Let x be the mean GPA of a random sample of 48 students selected from this University. Find the mean

94. ## MATHS STATISTICS

A. According to an estimate, 50% of the people in the United States have atleast one credit card. If a random sample of 30 persons is selected, what is the probability that 19 of them has atleast one credit card? PLIZ REALLY NEED HELP!! THANKS VERY MUCH..

95. ## linear algebra

solve using gauss jordan 10y − 4z + w = 1 x + 4y − z + w = 2 3x + 2y + z + 2w = 5 −2x − 8y + 2z − 2w = −4 x − 6y + 3z = 1

96. ## Math

The local dinner offers a meal combination consisting of an appetizer, two soups, four main courses, and five desserts. Your diet retricts you to choosing between a dessert and an appetizer. (You cannot have both). Given this restriction, how many

97. ## mathURGENT!!!!!!!!!!

if 4^(x)-4^(x-1)=24 what is the value of (2x)^x? please answer and explain step by step how u got it... PLEASE?????

98. ## mathURGENT!!!!!!!

if (4^x)-(4^x-1)=24 what is the value of (2x)^x? please answer and explain step by step how u got it... PLEASE?????

99. ## Physics

A loop of wire has the shape shown in the drawing. The top part of the wire is bent into a semicircle of radius r = 0.12 m. The normal to the plane of the loop is parallel to a constant magnetic field ( = 0°) of magnitude 0.85 T. What is the change ÄÖ