Friday
April 25, 2014

Posts by Don


Total # Posts: 396

Algebra 1
2+11b=8b+15

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

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

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

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

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...

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 machin...

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 machin...

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..

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

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?

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?????

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?????

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 magn...

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...

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 dur...

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 dur...

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 dur...

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?

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?

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?

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 ...

mathURGENT!!!!!!
how did you get that ms sue?

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????!!

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?

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?

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 ?

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???

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

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.

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?

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?

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 ...

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 ...

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.

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?

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?

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. I...

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 ...

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?

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

Spanish please help
yes sir!

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

Spanish
1) a 2)c

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!!!!

Physics
b

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!!

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!!!!

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 for...

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--- attr...

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...

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...

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 sho...

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

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

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?

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?

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.

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

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?

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?

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. Fro...

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?

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 ...

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

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 cent...

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?

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 c...

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 ...

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 c...

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 sto...

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 ...

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 ...

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?

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

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

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 horiz...

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 ...

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 ...

math
Holy Waa!! Your dad is a loan shark.... call the cops!

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?

Math
Suppose an odd function f has an inverse g. Prove that g is also odd.

Math
What is 6 less than half a number?

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

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?

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 ...

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.

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)?

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?

Calculus
Sorry - the total amount of fencing is 240 feet

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

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

math
sue has some ducks and some goats,if there are 36 legs altogether,what is the greatest number of goats possible

math
a number of teachers were to receive 6 pens each ,but needed 4 more pens for them to be equally divided.if each teacher received 9 pens, 25 more pens would be necessary.how many pens are there

math
my average results from the last 4 maths exams was 18 out of 25.what mark do i need in my fifth exam in order to increase the everage by 3%

math
a cube made up of some blocks and there are 12 cubes ,block a and b are removed from each other.how many blocks will remain in the 12 cubes altogether

math
a pool is filled with water in 6 hours at 100 m every hour. If 125 m could be filled every hour,the pool would be full at 11.00am.What was the latest possible time that the water could have started filling the pool

math
a large cogwheel contains 117 cogs, and a small one contains 52 cogs.if the large wheel revolves 20 times,find the amount of revolutions of the small wheel.

math
what is the next number of 3,4,8,17,33

math
a triangle,side ac is 3/5 of side ab,and is 23.1 m. side ab is 7/9 of side bc.angle b is 1.5 times larger than angle c,and angle a is twice the size of angle c.how many degrees is angle A

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