# Kevin

Popular questions and responses by Kevin
1. ## Statistics

The Jones family was one of the first to come to the U.S. They had 9 children. Assuming that the probability of a child being a girl is .5, find the probability that the Jones family had at least 5 girls.

2. ## Chemistry

For the reaction HCONH2(g) -->

3. ## geometry

Can someone check my work please? What is the area of the figure below? 18 in² 30 in² 36 in² (my choice) 60 in² What is the area of the figure below? 31.5 m² 63 m² (my choice) 84 m² 126 m² What is the value of h? 9.6 units 26.7 units (my choice) 48

4. ## Physics

An electron is projected with an initial speed of (1.6x10^6 m/s) into the uniform field between two parallel plates. Assume that the field between the plates is uniform and directed vertically downward, and that the field outside the plates is zero. The

5. ## physics

A motorist drives along a straight road at a constant speed of 15.0 m/s. just as she passes a parked police officer,the officer starts to accelerate at 2.00 m/s^2 to overtake her. assuming the officer maintains this acceleration, a) determine the time it

6. ## Calculus

find the area of the region inside the limacon r= 8 + 4sin(theta) HElp!! if you can show steps, i'd be greatful

7. ## Geometry

A surveyor sights the far bank of a river at an angle of 110˚ to the near bank. She then moves 75 feet upriver and sights the same point on the far bank of the river at an angle of 150˚. What is the shortest distance across the river?

8. ## Math

When Sarah takes the bus to work, the trip takes 30 minutes. When she takes the train to work, the trip takes 20 minutes. The average speed to the train is 15 mph faster than the speed of the bus. Find the distance to work.

9. ## geometry

The trapezoids are similar. The area of the smaller trapezoid is 564m^2. Find the area of the larger trapezoid to the nearest whole number. The smaaler trapezoid is 24m, and the larger trapezoid is 57m. Possible answers: 576m^2--3,249m^2--3,181m^2--14m^2

10. ## psychology

People have claimed that Jamie’s paintings have given them the blues. Clearly this cannot be entirely correct, since many of Jamie’s paintings contain no blue at all. The argument above is flawed because the author:

11. ## Social studies help PLEASE

Which of the following factors helped trade to thrive during the Roman empire? Select all that apply. A. peace throughout the empire B. a shared religion throughout the empire

12. ## Chemistry

The molarity of concentrated HCl purchased for laboratory use is approximately 12.1 M. How many milliliters of this reagent should be diluted to 1.000 L to make 0.100 M HCl?

13. ## goemetry

The pentagons below are similar. The area of the smaller pentagon is 30m^2. What is the area of the larger pentagon in m^2? Small pentagon is 4m and the larger one is 10m

14. ## Algebra

James walked 212 miles in 23 of an hour. What was his average speed, in miles per hour?

15. ## Physics

A 90 kg halfback runs north and is tackled by a 120 kg opponent running south at 4 m/s. The collision is perfectly inelastic. Just after the tackle, both players move at a velocity of 2 m/s north. Calculate the velocity of the 90 kg player just before the

16. ## physics

A cyclist is at rest at a traffic light. When the light turns green, he begins accelerating at 2.13 m/s2. How many seconds after the light turns green does he reach a cruising speed of 5.05 m/s?

17. ## physics

A soccer ball travelling at 15 m/s [E] bounces off of a goal post and ends up moving 12 m/s [S 30¡Æ E]. If the ball was in contact with the post for 0.10 seconds, calculate the acceleration of the ball.

18. ## english

The shed held a (motley) supply of gardening tools. choose the letter of the word or phrase that best matches the () word outdated decomposing varied (my choice) small please help small

19. ## math

in the sequence 2,6,10,... what term has a value of 106?

20. ## algebra 2b

A simple random sample of 50 adults was surveyed, and it was found that the mean amount of time that they spend surfing the Internet per day is 54.2 minutes, with a standard deviation of 14.0 minutes. What is the 99% confidence interval (z-score = 2.58)

21. ## Chemistry

If a 45.3-g sample of potassium nitrate is dissolved in enough water to make 225 mL of solution, what will be the molarity?

22. ## Algebra 2

A country's population in 1991 was 15 million. In 2001 it was 16 million. Estimate the population in 2005 using exponential growth formula. Round your answer to the nearest million.

71. ## ChemistryDrBob222

Concentrated sulfuric acid is 18.4 molar and has a density of 1.84 grams per milliliter. After dilution with water to 5.20 molar the solution has a density of 1.38 grams per milliliter. This concentration of H2SO4 is often used in lead storage

72. ## Algebra

a rectangle with perimeter of 198 cm is divided into 5 congruent rectangles. What is the perimeter of one of the five congruent rectangles? i got the expression 5w + 4L = 198 the rectangle has two smaller rectangle on the top facing horizontally on the top

73. ## Math

How would you work this... You are facing north. You turn 270 degrees counterclockwise. Which direction are you facing? Is it West? You start out at 90 and go from there? I don't know...

74. ## physics

The plates of a parallel plate capacitor each have an area of 0.40 m2 and are separated by a distance of 0.02 m. They are charged until the potential difference between the plates is 3000 V. The charged capacitor is then isolated. How much work is required

75. ## physics

1) A parallel plate capacitor has a potential difference between its plates of 1.2 V and a plate separation distance of 2.0 mm. What is the magnitude of the electric field if a material that has a dielectric constant of 3.3 is inserted between the plates?

76. ## physics

2) A proton is moving parallel to a uniform electric field. The electric field accelerates the proton and increases its linear momentum to 8.6 x 10^-23 kg·m/s from 2.4 x 10^-23 kg·m/s in a time of 5.7 x 10^-6 s. What is the magnitude of the electric

77. ## chem

For the reaction below, Kc = 0.154 at 2000 K. 2 CH4(g) ⇌ C2H2(g) + 3 H2(g) A 0.750 L equilibrium mixture at 2000 K contains 0.650 mol each of CH4(g) and H2(g). What is the equilibrium concentration of C2H2(g)?

78. ## Algebra

Dan is choosing between two exercise routines. In routine 1, he burns 20 calories walking. He then runs at a rate that burns 10.5 calories per minute. In routine 2, he burns 39 calories walking. He then runs at a rate that burns 5.75 calories per minute.

79. ## Sociology

Describe the demographic characteristics of the poor in the United States. What are some possible explanations for this distribution?

80. ## Chemistry

A 1.50 kg sample of a metal sample absorbs 43.5 kJ of heat, resulting in a Temperature rise of 65.0 °C. What is the specific heat capacity of the metal? M=1.50kG Q=43.5kJ dT=65C

81. ## Algebra

A rectangle's width is 6 inches less than its length. If it's area is 216 square inches find the dimensions of the rectangle. Write an equation and solve

82. ## Math

You do not have enough 6-inch beads to make the rope, so you will use 10-inch beads instead. Write and solve an inequality that represents the number of 10-inch beads that you can use.

83. ## math

A cylindrical tin of diameter 9cm and height 224cm is half filled with water.Find the volume of water in the tin.

84. ## Physics/Science

How much heat must be removed from 15.0g of water at 10°C to become ice at 0°C?

85. ## Physics

In the Biomedical and Physical Sciences building at MSU there are 135 steps from the ground floor to the sixth floor. Each step is 16.0 cm tall. It takes 5 minutes and 40 seconds for a person with a mass of 63.9 kg to walk all the way up. How much work did

86. ## Physics

Find the change in the force of gravity between two planets when the distance between them is decreased by a factor of 4.7

87. ## Chemistry

Calculate the molarity of 3 drops (0.15mL) of a 0.5M Na3PO4 solution after adding 15 drops (.75mL) of water. (Presume drops are the same size, one drop = 0.05mL)((Presume volumes are additive)) So far I've figured .15g Na3PO4/163.94g/mol Na3PO4 =

88. ## chemistry

Stoichiometrics: a 36 grams sample of calcium hydroxide is allowed to react with 40.5 grams of phosphoric acid according to the following reaction. 3Ca(OH)2 + 2H3PO4 = Ca3(PO4)2 + 6H2O how many grams of calcium phosphate are produced? how many moles of

89. ## math sqrt root

1) x¡Ô2x + 2¡Ô2x^3 + 2x^2/¡Ô2x Ans 4x¡Ô2x 2) (1/2)^1/3 Ans 3¡Ô1/2 = 3¡Ô4 /2 3) ¡Ô2/3 Ans ¡Ô6/3 4) 3¡Ô2/3 Ans 3¡Ô18/3 5) ¡Ô2 + 1/¡Ô2 Ans 3¡Ô2/2 Please help I really don't know how to simplify.

90. ## science

A force of 16.0 newtons is sufficient to set a box that is at rest into motion. If the coefficient of static friction is 0.380, what is the normal force acting on the box?

91. ## Physics

A 130kg mail bag hangs by a vertical rope 3.9m long. A postal worker then displaces the bag to a position 2.2m sideways from its original position, always keeping the rope taut.

92. ## Root Words

Which of the following root words means “more than one”? A. Junct- B. Ambi- C. Ject- D. Terr- B?

93. ## Definitions

A smaller group of people within a larger group A. Culture B. subculture C. Demography D. Population None of the definitions say anything like the question please help

94. ## Definitions

People joined together in business. A. Proprietorship B. Ownership C. Partnership D. Investment I got C

95. ## Algebra

Jan can run at 7.5 m/s and Mary at 8.0 m/s. On a race track Jan is given a 25m head start, and the race ends in a tie. How long is the track?

96. ## chemistry

In part B of my question, I was asked calculate the number of atoms in 0.615 mol of 13C (mass number of this Carbon is 13). I received the correct answer of 3.70E23 atoms. However, I do not know how to do Part C of my question, which asks "Based on your

97. ## Physics

Which of the following best describes kinematics? a) Kinematics is a part of mechanics that involves the description of motion. b) Kinematics is the branch of physics that deals with the motion of objects and the action of forces on the objects.

98. ## Physics

Suppose that an environmental study determines that a town produces approximately 2,000 lb of trash each day. The study group decides to convert their findings to SI units, using the conversion 1 lb = 0.4536 kg. They report that the town produces 907.2 kg