# carl

Popular questions and responses by carl
1. ## Maths

The sides of the equilateral triangle is 3x+2,2y-x and y+3 find x and y.and the perimeter of the triangle

2. ## stat

for randomly selected adults, IQ scores are normally distributed with a standard deviation of 15. the scores of 14 randomly selected college students are listed below. use a 0.10 significance level to test the claim that the standard deviation of IQ scores

3. ## math

A car left from Uphere at 9:00 am and arrived at Downthere, 340 km away at 1:15 pm the same day. Find the average speed of the car in kilometers per hour.

4. ## math

The median of a set of 8 consecutive even integers is 61. What is the largest integer in the set?

5. ## Trig

Which trigonometric function can equal or be greater than 1.000? A Sine B Cosine C Tangent D none of the above

6. ## Physics

Two objects are moving in the xy-plane. Object A has a mass of 3.2 kg and has a velocity of Va= (2.3 m/s)i + (4.2m/s)j and object B has a mass of 2.9 kg and has a velocity of Vb= (-1.8m/s)i + (2.7m/s)j. What is the total momentum of the system? (should I

7. ## Physics electric potential energy difference

A current loop with radius 20 cm and current 2 A is in a uniform magnetic field of 0.5 T. Considering all possible orientations of the loop relative to the field, what is the largest potential energy difference (in Joules) you can find between two

8. ## physics

water leaves a hose at a rate of 1.5kg/s with a speed of 20m/s and is aimed at the side of a car, which stops it (splashing back is ignored). what is the force exerted by the water on the car?

9. ## Physics

Two objects are moving in the xy-plane. No external forces are acting on the objects. Object A has a mass of 3.2 kg and has a velocity of Va= (2.3 m/s)i + (4.2m/s)j and object B has a mass of 2.9 kg and has a velocity of Vb= (-1.8m/s)i + (2.7m/s)j. Some

10. ## English II B

Need Help Please. A student is thinking about different forums for publishing an editorial. Which of the following would be appropriate? 1.a dramatic reading 2.an anthology 3.a poetry contest 4.a school newspaper

11. ## math

in triangle ABC, AB=6, BC=12 AND AC=X. Which of the following cannot be a value of x? a. 6 b.7 c.8 d.9 e.10

12. ## Dynamics

A stone has an initial velocity of 100 fps up to the right at 30 degrees with the horizontal. The components of the acceleration are constant at ax=-4 fps^2 and ay=-20 fps^2. Compute the horizontal distance covered until the stone reaches the point 60 ft

13. ## Math

Can someone please explain to me how to solve this: Simplify 6P2. A) 30 B) 15 C) 12 D) 720

14. ## Calculus (math)

A rescue cable attached to a helicopter weighs 2 lb/ft. A 190 lb man grabs the end of the rope and is pulled from the ocean into the helicopter. How much work is done by lifting the man if the helicopter is 50 ft above to water.

15. ## math

You roll 2 dice. The first die has 26 sides and contains the 26 letters of the English alphabet; the other die has 12 sides and contains numbers 1-12. What is the probability that you will roll a letter with one enclosed area (A, D, O, P, Q, R) and a

16. ## Geometry

A swimming pool is to be constructed in the space of partially overlapping identical circles. Each of the circles has a radius of 9 m, and each passes through the center of the other. Find the area of the swimming pool.

17. ## calculus

What is the length of the blue line labeled r in the image below? Give your answer in terms of a and b. blue line labeled r starting at the origin and ending at a point a,b b|------------| | /| | / | | / | | / | | / | | r / | | / | | / | | / | | / | | / |

18. ## math

Water is pumped into a cylindrical tank, standing vertically, at a decreasing rate given at time minutes r(t) = 130 - 10t ft^3/min for 0≤t≤5.The tank has radius 6 ft and is empty when t=0. Find the depth of the gasoline in the tank at t=3.

19. ## Dynamics

A boy running a foot race rounds a flat curve of 50 ft radius. If he runs at rate of 15 mph, at what angle with the vertical will be inclined his body? A.) 16.75° B.) 13.67° C.) 76° show solution step by step thanks

20. ## Geometry

A 12-foot ladder is leaning against the outside wall of a building. The angle of the ladder with the ground is 75 degrees. The ladder is moved so that the base of the ladder is 5.8 feet from the wall. Determine the angle created by the ladder and the

21. ## Chemistry

How does the three dimensional structure of SP3 bonds of Carbon, Nitrogen, Oxygen and Fluorine cause them to form polar or non-polar molecules? The answer must include a 3d diagram of the molecules, and a discussion of the effect of their electron

22. ## Math

What function should be used to maximize the volume of an open box that has a surface area of 24 and has a square bottom? Not sure how to do this, a step by step answer would be great. Thanks!!

23. ## smu

In a bumper test, three types of autos were deliberately crashed into a barrier at 5 mph, and the resulting damage (in dollars) was estimated. Five test vehicles of each type were crashed, with the results shown below. Research question: Are the mean crash

24. ## Trig

In ABC, vertex C is a right angle. Which trigonometric ratio has the same trigonometric value as Sin A? A Sin B B Cosine A C Cosine B D Tan A

25. ## geometry

The sum of the measures of the interior angles in a polygon is 540 degrees. How many sides does the polygon have?

26. ## math

What 2D figure would result if you sliced a right rectangular prism horizontally?

27. ## math

what is the result when you add 0 to both sides of an equation?

28. ## Algebra

If (4,2) is a point on the graph of y=f(x), which of the following points must be on the graph of y=f(2x). a) (4,1) b) (8,2) c) (2,2) d) (4,4)

29. ## math calculus

Let f be twice differentiable with f(0)=12, f(3)=9, and f '(3)=4.Evaluate the integral upper limit 3 and lower integral 0 xf'' (x)dx

30. ## Physics

During a typical afternoon thunderstorm in the summer, an area of 76.0 km2 receives 1.42 * 10^9 gal of rain in 18 min. How many inches of rain fell during this 18 min period?

31. ## Math

t) Let a , b , c and y be the three dimensional vectors a =4j +2k ,b =−3i +4j +4k ,c =3i −j ,y =8i −7j Perform the following operations on these vectors: (a) c⋅a +a⋅y = (b) (a ⋅b )a = (c) ((c⋅c)a )⋅a =

32. ## Algebra

Randall wants to mix 57 lbs of nuts worth \$1 per lb with some nuts worth \$6 per lb to make a mixture worth \$5 per lb. how many lbs of \$6 nuts must he use?

33. ## English II B

A student has completed a freewriting exercise. The result is a paragraph exploring the general theme of war in a literary text. What is the next step in the writing process? 1.gathering details 2.beginning an outline 3.writing an introduction 4.narrowing

34. ## English II B

What is the term for a magazine that is published on the computer? 1. computerized slide show 2. online publication 3. electronic portfolio 4. electronic bulletin board

35. ## Us history

Define unicameral legislature and bicameral legislature. Which type of legislature did must states have? I cant find what type of legislature did the states have

36. ## algebra

A boat can travel 114 miles upstream in the same time that it can travel 186 miles downstream. If the speed of the current is 6 miles per hour, find the speed of the boat without a current.

37. ## math

solve the equation by factoring. 3x(x-5)=6x^2-16x

38. ## Calculus

1/f = 1/p + 1/q What is the rate of change of p with respect to q if q=2 and f=4?

39. ## Math

Troy measures the length of a toy dog in centimeters. It is 6 centimeters long. He measures again to find the measurement in inches. The toy dog is how many inches?

40. ## math

1.integral cos(x)sqrt(sin(x))dx. upper limit pi and lower limit 0 2.integral 1/sqrt(x)(sqrt(x) +1)^2. Upper limit is 4 and lower limit is 1.

41. ## Physics

The average distance between Earth and the Sun is 1.5 ✕ 10^11 m. a) Calculate the average speed of Earth in its orbit (assumed to be circular) in meters per second. b) What is this speed in miles per hour?

42. ## Math

Differentiate y=13x^2-5x+8

43. ## Social Studies

Tax money that is spent in the community y is called an ____tax

44. ## math

arctan(y)=x+c To solve for y, would it just be: y=tan(x+c)?

45. ## Algebra

The Pi (π) Club at Math High School was planning a fundraiser to sell pepperoni pizza. A pizza company donated enough ingredients to make the equivalent of 300 extra large pepperoni pizzas (16” diameter). In trying to determine the number of pizzas of

46. ## calculus

You have been hired by a farmer to design a fenced-in rectangular enclosure for emus. The emus will require 720 square feet of area in which to roam, and the fence will cost 20 dollars per foot. The rectangular area will adjoin an existing wall, so a fence

47. ## Chemistry

Calculate the pH of the the solution that results from titrating 50 mL of 0.6 M HCN(aq) with 0.2 M NaOH At 0.00 mL of NaOH At 85 mL of NaOH. At 150 mL NaOH. At 160 mL of NaOH

48. ## Algebra

Factor: -3x^2 - 18x + 15

49. ## math

the width of a rectangle is 4cm and the length is 8 cm if both the width and the length are increased by equal measures, the area of the rectangle is increased by 64 cm 2. find the length and width of the larger rectangle

50. ## Physics

A 2050 kg truck is traveling east through an intersection at 2.3 m/s when it is hit simultaneously from the side and the rear. (Some people have all the luck!) One car is a 1200 kg compact traveling north at 4.5 m/s. The other is a 1600 kg midsize

51. ## Scientific Notation

I got all of them so far EXCEPT this one... help? Thank you! Convert the following into scientific notation: 1/137

52. ## Math (URGENT)

write a formula that gives you the number of regions formed when x points are placed on a circle and all possible chords are drawn. ex. 2pts has 2 regions, 3pts has 4 regions, 5pts has 17 regions

53. ## Math

write a formula that gives you the number of regions formed when x points are placed on a circle and all possible chords are drawn. ex. 2pts has 2 regions, 3pts has 4 regions, 5pts has 17 regions

54. ## algebra 2

teresa and julia are among 10 students who have applied for a trip to washington DC. Two students from the group will be selected at random for the trip. What is the probability that teresa and julia will be the 2 students selected /

55. ## science

Whats the best site to go on if you want to learn about the elements?

56. ## Calculus

If d/dx(f(3x^5))=9x^4 Find f'(x)

57. ## Calculus

C(x) = 16x^(1/2) + x^2/1000 Find x to meet the minimum cost

58. ## Calculus

C(x)= 16sqrt(x) + (x^2)/1000 Find the production level that will minimize the average cost

59. ## Math

How do I express these in scientific notation AND Log10 form? 1) ln(8.1) 2) 32.8 x 10^-2 + 3.15 x 10^-1 3) 10^-2 x 10^4.5 4) 10^-45 5) 8^2.34 Please show some effort, and please stop posting under multiple names.

60. ## Math

How do I express these in scientific notation AND Log10 form? 1) ln(8.1) 2) 32.8 x 10^-2 + 3.15 x 10^-1 3) 10^-2 x 10^4.5 4) 10^-45 5) 8^2.34 I will be happy to critique your work here. Most of these require conversion. Do the math, and let your calculator

61. ## math

what is the result when you add 0 to both sides of an equation? I asked this already, but I would like a deeper explination

62. ## Math

Two spheres are used in a certain machine. One has a volume of 7 cm3 and the other has a volume of 189 cm3. The radius of the small sphere is what fraction of the radius of the large sphere?

63. ## Math

The four shapes to the right are each drawn with a horizontal base and a vertical height. Figure A is a right-angled triangle, Figure B is an isosceles triangle, Figure C is a square, and Figure D is a rectangle. The figures are not drawn to scale. Using

64. ## Biology

A farmer plants a field of corn and fertilizes it with a low-nitrogen fertilizer. The corn receives plenty of sunlight and water but does not grow well. What might be preventing the corn from growing?

65. ## Algebra

If (4,2) is a point on the graph of y=f(x), which of the followint points must be on the graph of y=f(2x).

66. ## precalc

how to find difference quotient for: f(x) = 1/x+3

67. ## Precalc

find difference quotient f(x) = 1/x+3

68. ## Science

Common suspension and their uses

69. ## Genealogy

What is the best free of charge way to look up past birth records?

70. ## science

Can someone describe how a sound wave travels through a medium to create sound. Can you also provide a descriptions of vibrations, longitudinal waves, compressions, rarefactions, and direction of movement in your response. That way I could understand it

71. ## science

why is it advisable to use plasticwares instead of the conventional glasswares in spectrophotometry?

72. ## science

if 2 north poles are brought together, is the resultant pole strength of the combination equal to the sum of their pole strengths?

73. ## Science

When a bar magnet is cut into two halves repel each other. Why? What becomes of the original north and south poles of that magnet??

74. ## Science

Index of refraction is defined as the ratio of the speed of light in free space and its speed in the medium. What is the speed of light in a medium with n= 1.33?

75. ## Science

A ray of light hits a plane mirror lying across a floor 2m from the vertical wall. The angle of incidence of the ray is 40 degrees. At what point on the wall will the reflected light fall? Express the answer in terms of height from the floor.

76. ## Math

convert feet and inches to only feet. a) 17 ft 6 in

77. ## Social Studies

How did the role of the church in education change over time? A. Universities changed from being independent to being part of the church. B. Priests became the only teachers at universities. C. Schools began to provide education beyond religious

78. ## math

Find a substitution w and constants k,n so that the integral x^2sqrt(1-4x^3)dx has the form ∫kw^n dw .

79. ## math

Find the integral given below. integral cos^2(7x+1)dx

80. ## math

Find the exact value of integral t^2(2)^(-t^3). Upper limit is 1 and lower limit is 0.

81. ## math

Integrate following integrals. 1.integral ax+b/(sqrt(ax^2+2bx+c)dx 2.integral 1+x/(1+x^2)dx 3.integral e^x+1/e^x dx

82. ## math

Evaluate the integral given below. integral(x^2+13)^2dx

83. ## math

Find the integral given below. 7xe^(−4x^2)dx

84. ## math

(a) Find the general solution of the differential equation d y/d x =10x+5 (b) Find the solution satisfying y(1)=13

85. ## Physics

A commonly used unit of mass in the English system is the pound-mass, abbreviated lbm, where 1 lbm = 0.454 kg.What is the density of gasoline in pound-mass per cubic foot? (Assume the density of gasoline is 7.40 ✕ 10^2 kg/m3.)

86. ## Physics

Tectonic plates are large segments of the Earth's crust that move slowly. Suppose that one such plate has an average speed of 7.5 cm/year. a)What distance does it move in 1 s at this speed? b)What is its speed in kilometers per million years?

87. ## Physics

During a typical afternoon thunderstorm in the summer, an area of 76.0 km2 receives 1.42 * 10^9 gal of rain in 18 min. How many inches of rain fell during this 18 min period?

88. ## Math

Calculate the indicated Riemann Sums for the function g(x)=4-x^2 a)one rectangle b)two rectangles

89. ## Math

Find the equations of the tangent lines to the following curves at the indicated points. xy^2 = 1 at (1, −1)

90. ## Math

Compute the angle between the vectors i −j +k and −i −j −k . angle=

91. ## Math

The average length of the eight words Betty was asked to spell was 9 letters. The first seven words had the following lengths: 8 letters, 9 letters, 6 letters, 10 letters, 7 letters, 9 letters, and 11 letters. What was the length of the eighth word?

92. ## math

I have supplementary angles where the measure of one angle is ¼ the measure of the other. What is the measure of the larger angle? What is the measure of the smaller angle?

93. ## math

In a class of 20 students, the average (arithmetic mean) score on a test is 84 points. If 6 students each scored 100 points and 4 students each scored 50 points, what is the average of the scores of the remaining students?

94. ## math

56 is 15.625 percent of what number?

95. ## math

A student’s score on the first four mathematics tests of the year were 80, 95, 92 and 89. What must the student score on the fifth test so that the mean score for all five tests is exactly 90?

96. ## English

So I'm looking for a work of art (painting, movie, literature, poem, etc.) from 1990 to modern day that has one of these traits: - Feelings or intuition over reason - Champions individual freedom and worth of the individual - Civilization as artificial -

97. ## math

50 is what percent of 13?

98. ## math

What is the area of a quadrilateral with vertices at (1, 1), (4, 1), (7, 5) and (4, 5)?

99. ## math

William is traveling at a rate of 75 miles per hour. How fast is William traveling in feet per second?