# mike

Newest questions and responses by mike
1. ## Physics

a 230v/30v with 50Hz transformer that has a primary current of 0.6A which supplys number of 30v and 30 watts halogen light bulb. find the maximum number of bulb can operate. assume that its an ideal transformer and can operate within its rated value.

2. ## physics

a 230v/30v with 50Hz transformer that has a primary current of 0.6A which supplys number of 30v and 30 watts halogen light bulb. find the maximum number of bulb can operate. assume that its an ideal transformer and can operate within its rated value.

3. ## Chemistry

4NH3(g) +3O2(g) =2N2(g) +6H2O(l) 131.0 g of NH3 is mixed with 221.2 g of O2 and allowed to react. The reaction is complete when the NH3 is consumed. 107.8 g of N2 is formed and 36.60 g O2 remain unreacted. What mass of H2O is produced?

4. ## Algebra

Part A: Solve –mk – 90 > 85 for m. Show your work. (4 points) Part B: Solve 3c – 5f = 55 for f. Show your work. (6 points)

5. ## Engineering Science

I need help solving this circuit. I don't know where to start in regards to finding the total resistance. Is r4 in series with r5? Circuit is below: i96.photobucket.com/albums/l169/choicedelight/Circuit_3.png

6. ## Physics

A dog runs down his driveway with a constant speed of 3.8 m/s for 5.2 s. He then accelerates to a speed of 6.9 m/s in 5.2 s. How long is the driveway?

7. ## Engineering Science

Given the circuit below with unknown voltage source and a voltage drop of 2.233 v Volts on resistor R3, with (R1 = 2KΩ, R2 = 1KΩ, R3 = 3.3KΩ, R4 = 4.7KΩ, R5 = 4.7KΩ). Calculate and complete the table below. I need help finding the total voltage,

8. ## Calculus

Solve the integral: ∫ x^2+6x-3/(x+3)(x^2+2x+9) I'm stuck. IDK if my setup is correct either. ∫A/(x+3) + ∫Bx+C/(x^2+2x+9) F(x) = A ln(x+3) + ∫Bx+C/(x^2+2x+9) X^2+6x-3=A(x^2+2x+9) + Bx+C(x+3) X^2+6x-3=Ax^2+2Ax+9A+Bx^2+3Bx+Cx+3C

9. ## Calculus

Solve the integral: ∫ x^3/(x^+2)^2 I'm stuck. This is my work so far. ∫ A/(x^+2) + ∫ B/(x^2-2)^2 F(x)=A ln(x^2+2)-B/(x^2+2)+C X^3=A(x^2+2)+B

10. ## Algebra

If a and b are integers such that a^2− b^2 = 100, what is the greatest possible value of a?

11. ## Engineering Science

The meter reads 7.84 mA when the switch is in position A. What is the resistance of R4? R1=220 Ω R2=470 Ω R3=510 Ω VS =12 V I honestly have no clue how to solve this. Please help.

12. ## Calculus

Solve the integral: (2x-3)/(x^3-x^2) I'm stuck at finding A. I did partial fractions. I've already found B and C. At x=1, C=-1 At x=0, B=3

13. ## Calculus

Solve the integral: 5/x(x^2-4) dx I've done the partial fractions and found B and C, both equaling 5/8; and that's gonna give me 5/8 ln|x^2-4|. I just need help finding A

14. ## Physics (Engineering Science)

Find the total resistance (in series) of 1.0 MΩ, 560 kΩ, 5.6 MΩ, 680 kΩ and 10 MΩ So I understand to find total resistance is RT= R1+R2+R3.... but it's the MΩ that's confusing me on what I should do

15. ## Physics

A block of mass M rests on a block of mass M1 = 5.00 kg which is on a tabletop. A light string passes over a frictionless peg and connects the blocks. The coefficient of kinetic friction mk at both surfaces equals 0.330. A force of 46.0 N pulls the upper

16. ## Calculus

Solve the integral: (1-x^2)^(3/2)/x^2 This is what I have so far. I used trig substitution. x=sin theta dx=cos theta dtheta [1-(sin^2 theta)^(3/2)]*[cos theta dtheta]/(sin^2 theta) [(cos^3 theta)]*[cos theta dtheta]/(sin^2 theta) (cos^4 theta)/(sin^2

17. ## Calculus

Solve the integral (x+3)/(x-1)^3 So far, I'm stuck. This is what I have thus far: x+3 = A(x-1)^3/(x-1) + B(x-1)^3/(x-1)^2 + C(x-1)^3/(x-1)^3 x+3 = A(x^2-2x+1) + B(x-1) + C x+3 = Ax^2 - 2Ax +Bx + A - B + C x+3 =Ax^2 + 1(B-2A)x + (A - B + C)

18. ## math

what is the surface area of a 10 inch balloon

19. ## Geography

Find the precision for each measurement. 120 meters, 7 1/4 inches, 30.0 millimeters

20. ## US History

I am having a really hard time with this assignment. Can anyone cross check my answers? Thank you 1.The term participatory democracy applies most accurately to which of the following societies? A. Greece in the fourth century B.C. B. Modern China C. The

21. ## Calculus check my answers

1. The general solution of the differential equation dy - 0.2x dx = 0 is a family of curves. These curves are all: a. lines b. hyperbolas c. parabolas (my answer) d. ellipses 2. The table below gives selected values for the function f(x). Use a trapezoidal

22. ## chemistry

A car is moving at 45.0 miles per hour. How many minutes would it take to travel 228 km? Given: 1.000 mile = 1.609 km. 189 489 106 31.5

23. ## Chemistry

The density of acetone is 0.788 g/mL. What is the volume in mL of a 48 mg sample of acetone? 3.8 x 104 mL 6.1 x 104 mL 6.1 x 10-2 mL 3.8 x 10-2 mL 1.6 x 101 mL

24. ## math

A netball team scored 60,42,48 and 46 goals in thier first four matches. a)What is the mean number of goals for the first four matches? b)The team shoots only 39 goals in the fifth match.What is the mean number of goals scored for the fine matches? c) The

26. ## Calculus

By finding the slopes of the tangent lines to the curve of y=(1/3)x^3+5x at the points where x=3 and x=6, find the acute angle between these lines at the point where they cross. I don't have any idea where to start. An explanation would be appreciated.

27. ## Calculus

A rocket follows a path given by y=x-1/91x^3 where distances are in miles. If the horizontal velocity is given by vx=1.4x, find the direction of the velocity when the rocket hits the ground (assume level terrain) if time is in minutes. So far I've only

28. ## Math

Help! I need the work and how to check it too! Victoria and Georgetown are 36.2 mi from each other. How far apart would the cities be on a map that has a scale of 0.9 in: 10.5 mi?

29. ## Calculus

Find any relative max or min points of the given function y=3x^2+12x+17 So far, I have: y'=6x+12=0 2(3x+6)=0 x=-2

30. ## Calculus

Find the equation of a normal line to the given curve with the given slope y=(4x-7)^3, slope -1/12, x>0 So far, I have: y'=12(4x-7)^2 12(4x-7)^2=12 4x-7=+1,-1 x=2, x=3/2

31. ## Calculus

Find the equation of the line tangent to the given curve with the given slope y=(1/3)x^3+2x^2+5, m=-4 I'm stuck. So far, I have: y'=x^2+4x x^2+4x=-4

32. ## Math

Which measure correctly completes that statement? 3,271.5 milligrams=?grams A.0.032715 ML B.5,388.26 ML**** C.538.826 ML D.53,882,600 ML

33. ## Math

I need urgent help with these 3 math problems 1. Margaret painted a mural for St. Patrick’s Day and mixed her own green paint. She mixed 3 parts yellow paint with 2 parts blue paint to create green paint. Maureen wanted to also paint a mural with the

34. ## pre-calc

A Ferris wheel is 50 meters in diameter and boarded from a platform that is 4 meters above the ground. The six o'clock position on the Ferris wheel is level with the loading platform. The wheel completes 1 full revolution in 8 minutes. How many minutes of

35. ## Calculus

A uniform layer of ice covers a spherical​ water-storage tank. As the ice​ melts, the volume V of ice decreases at a rate that varies directly as the surface area A. Show that the outside radius decreases at a constant rate.

36. ## Trig

Write an equation of the circle described below: Given a circle with the center (5,1) and a point on the circle (8,-2).

37. ## Trig

a pilot wishes to fly on a course bearing 45 and with a ground speed of 600 km per hour. If a wind is blowing from the southwest (bearing 315) at 80 km per hour. What must be the heading and air speed of the aircraft?

38. ## Math

We have the survey data on the body mass index (BMI) of 648 young women. The mean BMI in the sample was x¯=27.2. We treated these data as an SRS from a Normally distributed population with standard deviation σ= 7.4. Find the margins of error for 90%

39. ## Algebra

Solve –(5)–1 A. –1/5 B. –5 C. 5 D. 1/5

40. ## Math

Tangent of an acute angle of a rhombus is 3⁄4, whereas its side is 10 cm long. Find an area of the rhombus.

41. ## Math

Tangent of an acute angle of a right triangle is 1⁄2. Area of the triangle is 25 m2. Find legs of this triangle.

42. ## Math

In a right triangle, one leg is 40 cm long and the hypotenuse is 104 cm long. Find the tangents of its acute angles.

43. ## Math

Cosine of a basic angle of an isosceles triangle is 1⁄2, while its area equals 4√3 cm2. Find the lengths of the sides of this triangle.

44. ## math

How sensitive to changes in water temperature are coral reefs? To find out, scientists examined data on sea surface temperatures and coral growth per year at locations in the Red Sea. Here are the data: Sea surface temperature 29.71 29.84 30.31 29.66 30.47

45. ## Math

The toco toucan, the largest member of the toucan family, possesses the largest beak relative to body size of all birds. This exaggerated feature has received various interpretations, such as being a refined adaptation for feeding. However, the large

46. ## Physics

A baseball hit just above the ground leaves the bat at 26 m/s at 45∘ above the horizontal. How far away does the ball strike the ground? How much time is the ball in the air? What is its maximum height?

47. ## Calculus

Evaluate slope of a tangent line: y=1-(1/2)x^2, P(2,-1) The answer is supposed to be -1, but I'm getting -2. [1-2-2h-(1/2)h^2]-[-1]/h [-1-2h-(1/2)h^2+1]/h [h(-2-1/2h)]/h -1/2(0)-2 =-2

48. ## Algebra

Determine zeros of F(x)= -x^4 + x^2 + 1

49. ## Physics

Determine the x-intercepts of the polynomial function y=-6(x+7)^4 + 5. Round to two decimal places, if necessary.

50. ## Math

In parallelogram ABCD, AB=10cm, Angle A = 70 gradus, diagonal DB is perpendicular to AB. Find CB, DB, area of ABCD.

51. ## Math

A boat travels 9 km due south and then 7 km due west. What angle should the boat make with the north line to return to the base (see figure to the right)?

52. ## Math

Find the height of a tree given that it casts a shadow 1.5 m long when the elevation of the sun is 550 (see figure to the right).

53. ## Physics

A bullet with a mass of 28 g is fired from a 2.8-kg gun that is stationary, but free to recoil. After the bullet is fired, the gun is observed to be moving at 1.4 m/s [left]. What is the velocity of the bullet?

54. ## Physics

A toboggan, with rider, has a combined mass of 60kg at the top of a 5.0m hill. They are given an initial push of 2.0m/s. The distance down the hill was 20m. The velocity at the bottom of the hill is 10m/s. If the actual speed at the bottom was 9m/s, what

55. ## Physics

An arrow slows down from 43 m/s to 28 m/s as it passes through an apple. If the 493 g apple was originally at rest and sped up to 0.44 m/s, what is the mass of the arrow?

56. ## Physics

An arrow slows down from 43 m/s to 28 m/s as it passes through an apple. If the 493 g apple was originally at rest and sped up to 0.44, what must be the mass of the arrow?

57. ## math

3/5 of a revolution represents approximately how many radians? Question 12 options: 6.28 3.14 3.77 108.00

58. ## math

how do you find the shape, center, variability, and outliers of a histogram?

59. ## English

When you think of separation or isolation, what comes to mind? It might be helpful to brainstorm or create a mind map. What image(s) could you use to symbolize separation? When you choose your symbol, try to find words that rhyme with it, and write them

60. ## Math

Carmike Company can further process Product A to produce Product B. Product A is currently selling for \$25 per pound and costs \$10 per pound to produce. Product B would sell for \$32 per pound and would require an additional cost of \$10 per pound to

61. ## Accounting

Fender Company had the following data for four months. Total Cost Production Units January \$50,000 1,000 February\$53,750 1,150 March \$61,250 1,450 April \$65,250 1,610 Use the “high-low” method to calculate the estimated variable cost per unit. A. \$25

62. ## Calculus

Calculate the area of the region bounded by the graphs of the given equations y=x^2-5x+4 and y=-(x-1)^2 The answer is supposed to be 9/8, but I'm getting -111/8. Idk what I'm doing wrong

63. ## Calculus

Find the limit lim tan^2(7x)/9x x-> 0

64. ## Math

In 7 days, a group of workers can plant 21 acres. What is their rate in acres per day?

65. ## Computers

Convert from binary to decimal (1000)2 - (0011)2 = (?)10

66. ## Accounting

A company is considering replacing an old machine which had an initial cost of \$100,000 and has \$75,000 of accumulated depreciation to date.The company is considering purchasing a new machine which costs \$195,000.The old machine could be sold for

67. ## Calculus

Solve using chain rule y=(3x^3+1)(-4x^2-3)^4 So far, I have: y'=(3x^3+1)*4(-4x^2-3)^3*(-8x)+(-4x^2-3)^4*(9x^2)

68. ## Calculus

Approximate the area under the curve of f(x)=9-x^2 between x=-2 and x=3 by calculating the area of 5 rectangles for both left hand endpoints and right hand endpoints. I have the left hand and right hand endpoints, what I need help in is solving for the

69. ## Calculus

Find dy/dx and express the final answer with a common denominator y=ln x^(2(4x-12))

70. ## Calculus

Calculate the Riemann sum of the area under the curve of f(x)=9-x^2 between x=-2 and x=3 The answer I come up with is 10/3, but when I solve using integrals, the answer I get is 100/3. Am I doing something wrong?

71. ## Calculus

Find dy/dx and express the final answer with a common denominator y=lnx^2(4x-12)

72. ## Calculus

Find y that satisfies the given condition dy/dx=20x(5x^2-1)^3; curve passes through (1,3) I took the antiderivative and ended up with 10x^2((5x^2-1)^4/4). I end up with a large number at the end, which I think might be wrong.

73. ## Calculus

Differentiate and simplify as much as possible. Cube root(5z+6/-9z+3). The answer should be y'= (23(-9z+23)^2/3)/9(3z-1)^2(5z+6)^2/3) So far, I'm stuck at y'=[23/3(5z+6)(3z+1)][((5z+6)^1/3)/((-9z+3)^1/3)]

74. ## Math

We have a trapezoid ABCD and the diagonals intersect in point O. AO : OC = m : n Prove that DO : OB = m : n

75. ## Math

We have a trapezoid ABCD and the diagonals intersect in point O. AO : OC = m : n Prove that DO : OB = m : n

76. ## Math

Inside a triangle formed by the line 3x+4y=1 and the positive coordinate axis, inscribe a square with three of the vertices on the coordinate axes and one vertex on the line. 1) Find the length of a side of the square. In the triangular region described

77. ## Calculus

Find where the function is increasing and where it is decreasing f(x)=2sin(x) on [0,2pi] Thanks

78. ## Chemistry

Why are some solutes soluble in water, but others are soluble in cyclohexane?

79. ## Math

Imagine a circle of rope, which has twelve evenly spaced knots tied in it. Suppose that this rope has been pulled into a taut, triangular shape, with stakes anchoring the rope at knots numbered 1, 4, and 8. Make a conjecture about the type of the triangle.

80. ## Calculus

Find the inflection points y=x^2/x^+3 So far I've found y'=6x/(x^2+3)^2 but I'm stuck in finding y''. So far, I'm at 6(x^2+3)^2-24(x^2+3)/(x^2+3)^4 and the next step says y''=6(-3x^2+3)/(x^2+3)^3=0 and I don't understand how. Thanks

81. ## Chemistry intro

H2SO4+2NaOH->2H2O+Na2SO4 1.) How many grams of H2SO4 are needed to produce 135L of water? 2.) How many molecules of water are produced when 12g of sodium sulfate are created?

82. ## Calculus

Find the extreme values of the function and determine the intervals where the function is increasing/decreasing expressed in interval notation. x(x-2)^2 So far I've found y'=3x^2-8x+4. Thanks

83. ## Physics

A train slows down as it rounds a sharp horizontal turn, going from 90 km/h to 54 km/h in the 15.0 it takes to round the bend. Compute the acceleration at the moment the train reaches 50.0 km/h. Assume the train continues to slow down at this time in the

84. ## Chem

So i wrote a net ionic equation, and I believe is wrong. Fe(ClO4)3. I wrote 3H+(aq) + Fe(OH)3(s) = Fe3(aq)+ + 3H2O (l) Had to come up with the acid and base that would form the compound

85. ## Calculus

Find dy/dx for y=3tan^-1(x/2). I know the answer is 6/x^2+4 but I'm stuck at y'=3(1/1+(x/2)^2)(1/2)

86. ## Physics

Calculate the weight of an object whose Mass is 5kg.(take g=10m\s

87. ## Physics

Calculate the weight of an object whose Mass is 5kg.(take g=10m\s

88. ## ER Diagram - Database

An online retailer, S record, which sells physical music albums, plans to implement a DBMS to enhance its data management practice and ultimately advance business operations. The requirements collection and analysis phase of the database design process has

89. ## Math

Solve for 0 < θ ≤ π sin θ = sin 2θ I get (0,π/3,π,5π/3). Idk what I did wrong.

90. ## math

sally and hans started counting at the same time. sally counted on by tens from 300. hans counted back by hundreds. after six counts they had reached the same number. what number did hans start counting from?

91. ## physical science

two cars are headed straight for each other, each at a constant speed of 40mph. A. do the two cars have the same speed? b. do the two cars have the same velocity? c. what is the acceleration of each car while moving at a constant speed

92. ## Math-college

Tim is making is making a sandwich he has 3 choices of bread, 2 choices of lettuce, 4 choices of meat, and 6 spreads to choose from. How many combinations is he able to make?

93. ## algebra-math

A club with 25 members wishes to select a 4-member leadership team. How many ways can this be done? 25x4=100 100 variations in the leadership team Would this be correct by any chance?

94. ## algebra-math

Amy is packing her bags for her trip that she won to go on a boat cruise. Amy won 4 tickets to the boat cruise and Amy can only bring 3 people along with her on this trip, but 15 of her friends want to go. How many different types of groups of friends can

95. ## Math-college

Here is my problem. I bought my son Tommy, his back to school clothes. I can’t tell you how happy he is too being going back. Tommy now has, 7 Shirts: 7 Pants: 3 pairs of shoes: How many different possible outfits can Tommy make? Answer would be,

96. ## algebra-math

When it comes to linear inequalities, these are explained to be similar to a linear equation, but the difference between the two is that the equal signs are replaced with an inequality symbol. It is also explained that when it comes to doing a linear

97. ## algebra-math

Make a preferred method of solving a system of linear equations and why. Which method do you prefer? Do you think that matrices make the process easier? Or do you prefer not to use matrices? Once again thank you for any help given on this.

98. ## algebra-math

Create a system of linear equations. Explain the steps for solving a system of linear inequalities. Make a system of linear inequalities problem. Please help me with this?