Wednesday
October 1, 2014

Posts by don


Total # Posts: 404

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 previous study, the ...
September 21, 2014

math
you download 12 new songs to your mp3 player. then you delete 5 old songs.. write each amount as an integer?
August 28, 2014

Math
What do I do next after that?
August 2, 2014

Math
but i dont get the first one
August 2, 2014

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
August 2, 2014

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?
May 23, 2014

English
What is a metaphor for a deep voice?
May 22, 2014

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)
May 17, 2014

Algebra 1
2+11b=8b+15
November 4, 2013

DISCRETE MATHS
Prove that if n is an odd positive integer, then 1 ≡ n2 (mod 4).
October 25, 2013

DISCRETE MATHS
Use the Euclidean Algorithm to find gcd(112,15)
October 4, 2013

DISCRETE MATHS
What is the cardinality of this set? {p, {p}, {p, {p}}} my answer is 1. is it right?
September 2, 2013

finance
12.6% is the wrong answer. Try 8.5%
July 15, 2013

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
June 2, 2013

stats please help ASAP!!!
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 and standard deviation...
May 17, 2013

MATHS STATISTICS(PLEASE HELP ANYONE!!
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 adjusting the ...
May 13, 2013

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 adjusting the ...
May 13, 2013

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..
May 13, 2013

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
May 13, 2013

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 three-course meals are possible?
May 6, 2013

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?????
April 20, 2013

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?????
April 20, 2013

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 in the ...
April 8, 2013

Physics
In 1996, NASA performed an experiment called the Tethered Satellite experiment. In this experiment a 2.20 104-m length of wire was let out by the space shuttle Atlantis to generate a motional emf. The shuttle had an orbital speed of 7.50 103 m/s, and the magnitude of the earth...
April 8, 2013

Physics
A positively charged particle of mass 5.60 10-8 kg is traveling due east with a speed of 60 m/s and enters a 0.49-T uniform magnetic field. The particle moves through one-quarter of a circle in a time of 1.20 10-3 s, at which time it leaves the field heading due south. All ...
April 4, 2013

Physics
A positively charged particle of mass 5.60 10-8 kg is traveling due east with a speed of 60 m/s and enters a 0.49-T uniform magnetic field. The particle moves through one-quarter of a circle in a time of 1.20 10-3 s, at which time it leaves the field heading due south. All ...
April 4, 2013

Physics
A positively charged particle of mass 5.60 10-8 kg is traveling due east with a speed of 60 m/s and enters a 0.49-T uniform magnetic field. The particle moves through one-quarter of a circle in a time of 1.20 10-3 s, at which time it leaves the field heading due south. All ...
April 4, 2013

Physics
An electron has a kinetic energy of 7.00 10-17 J. It moves on a circular path that is perpendicular to a uniform magnetic field of magnitude 4.40 10-5 T. Determine the radius of the path?
April 4, 2013

Physics
A wire has a length of 5.40 10-2 m and is used to make a circular coil of one turn. There is a current of 2.30 A in the wire. In the presence of a 3.80-T magnetic field, what is the maximum torque that this coil can experience?
March 25, 2013

Physics
A wire has a length of 5.40 10-2 m and is used to make a circular coil of one turn. There is a current of 2.30 A in the wire. In the presence of a 3.80-T magnetic field, what is the maximum torque that this coil can experience?
March 25, 2013

Physics
An á-particle has a charge of +2e and a mass of 6.64 10-27 kg. It is accelerated from rest through a potential difference that has a value of 1.16 106 V and then enters a uniform magnetic field whose magnitude is 3.00 T. The á-particle moves perpendicular to the ...
March 25, 2013

mathURGENT!!!!!!
how did you get that ms sue?
March 20, 2013

mathURGENT!!!!!!
for which integers will the square of the integer decreased by twice the integer produce a difference of less than 4? please answer and explain how you got the answer...please????!!
March 20, 2013

Physics
If the first qubit is in the state 2/sqrt(5)|0> - 1/sqrt(5)|1> and the second qubit is in the state 1/sqrt(2)|0> - i/sqrt(2)|1>, what is the state of the composite system?
March 17, 2013

Quantum Physics
If the first qubit is in the state 2/sqrt(5)|0> - 1/sqrt(5)|1> and the second qubit is in the state 1/sqrt(2)|0> - i/sqrt(2)|1>, what is the state of the composite system?
March 11, 2013

Quantum Physics
a) If |u>= |v> = |+ >, what is the probability that the measurement outcome is 0 ? b) If |u> = |+ > and |v> = |-> , what is the probability that the measurement outcome is 0 ?
March 11, 2013

mathURGENT!!!!!!
what is the greatest value of m such that 25!/5^m is an integer? hint: the exclamation point means "factorial". 3!=3*2*1=6 4!=4*3*2*1=24 etc. please answer and explain how you got it!!!!please???
March 8, 2013

MA111
lim x!0 k + cosmx x2 = −4 . FIND M AND X?
March 7, 2013

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.
March 6, 2013

Maths
How many ordered triples of positive integers (a,b,c) with 1<=a,b,c<=5 are there such that ax^2+bx+c has a rational solution?
March 1, 2013

maths
How many ordered triples of positive integers (a,b,c) with 1¡Üa,b,c¡Ü5 are there such that ax^2+bx+c has a rational solution?
February 28, 2013

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 integers. What is the ...
February 28, 2013

Physics
The coil of wire in a galvanometer has a resistance of RC = 78.0 Ù. The galvanometer exhibits a full-scale deflection when the current through it is 0.440 mA. A resistor is connected in series with this combination so as to produce a voltmeter. The voltmeter is to have ...
February 24, 2013

Physics
In the drawing below, R1 has a resistance of 6.2 Ù and R2 has a resistance of 2.6-Ù. Determine the current (magnitude and direction) in the 6.2 and 2.6-Ù resistors in the drawing.
February 24, 2013

Physics
A battery has an internal resistance of 0.017 Ù and an emf of 9.00 V. What is the maximum current that can be drawn from the battery without the terminal voltage dropping below 8.75 V?
February 23, 2013

math
How much money would have to be deposited into a compound interest savings account earning 5% each year in order to accumulate $10,000 in 18 years?
February 23, 2013

trig
To determine the distance to an oil platform in the Pacific Ocean, from both ends of a beach, a surveyor measures the angle to the platform from each end of the beach. The angle made with the shoreline from one end of the beach is 83 degrees, from the other end 78.6 degrees. ...
February 19, 2013

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. Assume that the ground is ...
February 19, 2013

Physics
The electric potential energy stored in the capacitor of a defibrillator is 77 J, and the capacitance is 123 µF. What is the potential difference that exists across the capacitor plates?
February 18, 2013

Spanish Please help
14)c 15)b 16)d 17)c 18)b
February 14, 2013

Spanish please help
yes sir!
February 14, 2013

Spanish please help
3) pienso 4)entiende 5)prefieren 6)quieres 7)pensamos 8)cierre 9)cerramos 10)digo 11)dice 12)decimos 13)dicen
February 14, 2013

Spanish
1) a 2)c
February 14, 2013

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!!!!
February 14, 2013

mathURGENT!!!!!!
the lines satisfying the equations x+2y=3 and 3y+ax=2 are perpendicular to each other. find the value of 'a'. please answer and explain how you got, please!!
February 5, 2013

mathURGENT!!!!!!
determine the smallest prime number that divides the following sum: 3^12+5^13+7^14+11^15? please answer and explain step by step how u got it!!!!
February 4, 2013

Physics
The drawings show three charges that have the same magnitude but different signs. In all cases the distance d between the charges is the same. The magnitude of the charges is |q|= 5.5 µC, and the distance between them is d = 4.3 mm. Determine the magnitude of the net ...
February 3, 2013

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 ---Select--- ...
January 29, 2013

mathURGENT!!!!!!!
a certain type of candy is sold in small boxes of 8 and large boxes of 15. notice it would be impossible to buy exactly 12 candies without breaking up a box. it would also be impossible to buy 17 candies without breaking up a box. what is the greatest number of candies that it...
January 26, 2013

math URGENT!!!!!!!
a certain type of candy is sold in small boxes of 8 and large boxes of 15. notice it would be impossible to buy exactly 12 candies without breaking up a box. it would also be impossible to buy 17 candies without breaking up a box. what is the greatest number of candies that it...
January 22, 2013

MATH URGENT!!!!!!!
the will of an eccentric millionaire reads as follows: "i leave 4/17 of my estate to my son, 7/13 of the remainder to my wife, 2/3 of this remainder to my daughter, and the remaining $2million to my dog." what was the total amount of the estate? please answer and ...
January 19, 2013

CHEMISTRY
An equilibrium mixture of the following reaction was found to have = 0.0325 at 1200 degrees C. What is the concentration of I? I2(g)<->2I (g) Keq=1.3×10−2 at 1200
November 28, 2012

chem 4
How many grams of sodium chloride are needed to make 1 L of 0.9% (m/v) sodium chloride solution (“isotonic saline”).
November 22, 2012

chem 3
(a) If H is positive and S is negative, would G to be positive or negative or is it dependent on T? (b) For the sign of G that you have in part (a) would the reaction be spontaneous, nonspontaneous, or dependent on the value of T?
November 22, 2012

chem 2
What is the concentration of the final solution if 1 liter of 6 M HCl is diluted to a final volume of 2 L?
November 22, 2012

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.
November 22, 2012

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
November 22, 2012

Physics
A 0.069-kg arrow is fired horizontally. The bowstring exerts an average force of 65 N on the arrow over a distance of 0.95 m. With what speed does the arrow leave the bow?
November 12, 2012

Physics
A cable lifts a 1060-kg elevator at a constant velocity for a distance of 39 m. What is the work done by each of the following?
November 12, 2012

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 positive direction. ...
November 12, 2012

Physics
Suppose the surface (radius = r) of the space station in the figure is rotating at 38.6 m/s. What must be the value of r for the astronauts to weigh one-half of their earth-weight?
November 7, 2012

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 without relying ...
November 7, 2012

Physics
A "swing" ride at a carnival consists of chairs that are swung in a circle by 12.0 m cables attached to a vertical rotating pole, as the drawing shows. (è = 60.0°) Suppose the total mass of a chair and its occupant is 222 kg
November 7, 2012

physics
Each of the space shuttle's main engines is fed liquid hydrogen by a high-pressure pump. Turbine blades inside the pump rotate at 595 rev/s. A point on one of the blades traces out a circle with a radius of 0.02 m as the blade rotates. (a) What is the magnitude of the ...
November 7, 2012

physics
A satellite is in a circular orbit about the earth (ME = 5.98 1024 kg). The period of the satellite is 4.20 104 s. What is the speed at which the satellite travels?
November 7, 2012

Physics
A racetrack has the shape of an inverted cone, as the drawing shows. On this surface the cars race in circles that are parallel to the ground, and the surface is at an angle è = 20°. For a speed of 40 m/s, at what value of the distance d should a driver locate his ...
November 7, 2012

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 without relying ...
November 7, 2012

Physics
A block is hung by a string from the inside roof of a van. When the van goes straight ahead at a speed of 31 m/s, the block hangs vertically down. But when the van maintains this same speed around an unbanked curve (radius = 145 m), the block swings toward the outside of the ...
November 7, 2012

Physics
A stone has a mass of 6.00 10-3 kg and is wedged into the tread of an automobile tire, as the drawing shows. The coefficient of static friction between the stone and each side of the tread channel is 0.73. When the tire surface is rotating at a maximum speed of 17 m/s, the ...
November 7, 2012

Physics
The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. Assuming the earth is a sphere with a radius of 6.38 106 m, determine the speed and centripetal acceleration of a person situated ...
November 6, 2012

Physics
The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. Assuming the earth is a sphere with a radius of 6.38 106 m, determine the speed and centripetal acceleration of a person situated ...
November 6, 2012

chem
What is the total pressure of a mixture of 0.3 atm of F2, 0.5 atm of Cl2, and 0.8 atm of O2?
November 5, 2012

chem
Calculate the number of mol of helium in a 11.2 L balloon at 300 K and 1.00 atm of pressure ?
November 5, 2012

chem
If 10.0 mol of CO occupies a volume of 20.0 L what volume would 4.0 mol of CO occupy?
November 5, 2012

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° relative to the ...
October 30, 2012

Physics
The drawing shows three particles far away from any other objects and located on a straight line. The masses of these particles are mA = 363 kg, mB = 517 kg, and mC = 154 kg. Find the magnitude and direction of the net gravitational force acting on each of the three particles...
October 30, 2012

enviromental
Completely mixed flow ractor CSTR and plug flow reactor (PFR) may have significantly different efficiencies depending on the reaction order. This problem asks you to compare the relative reactor sizes required to ensure 99.0 % removal of wastewatwer pathogens. Wastewater from ...
October 14, 2012

math
Holy Waa!! Your dad is a loan shark.... call the cops!
October 9, 2012

Phy I
Two forces, 1 and 2, act on the 5.00 kg block shown in the drawing. The magnitudes of the forces are F1 = 47.5 N and F2 = 34.5 N. What is the horizontal acceleration (magnitude and direction) of the block?
October 3, 2012

Math
Suppose an odd function f has an inverse g. Prove that g is also odd.
September 26, 2012

Math
What is 6 less than half a number?
September 23, 2012

geometry
if AB=CD, AB is 12-y, CD = 3x-4y, BD = 18, AC = x+y, what is x, y, and AC
September 15, 2012

calculus
I need help with the following problem: From a point 50 meters from the bottom of a radio tower along level ground, the angle of elevation to the top of the tower is 67 degrees. What is the height of the tower?
September 3, 2012

Calculus
I need help with the following problem: You're in a hot air balloon with your support crew on the ground. Attached to the balloon are two tether cords of length 350 feet and 400 feet that your crew attached to the ground. These cords form an angle of 50 degrees where they ...
September 3, 2012

calculus
I need help with the following question: Which of the following is an example of a function whose derivative is always 3? Choices are: f(x) = x=3 f(x) = 5x+3 f (x) = 3x+5 f(x) = 3 Thank you.
August 28, 2012

math
I need help answering the following question: A road sign reads: "5% grade next 4 miles." What is the change in elevation from the lookout to the point four miles ahead (to the nearest foot)?
August 26, 2012

math
I need help with the following question: While fishing on a lake, you see a fish below water at a 25 degree angle with the surface, producing air bubbles on the surface of the water 20 feet ahead. How far away is the fish from the boat?
August 26, 2012

Calculus
Sorry - the total amount of fencing is 240 feet
August 24, 2012

Calculus
How do I find the total area of three connected equally sized pens built so as to maximize the area bounded?
August 24, 2012

math
out of 40 people,17 have brothers,22 have sisters and 9 have both.how many people have neither brothers nor sisters
August 18, 2012

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