Thursday

January 19, 2017
Total # Posts: 740

**Precalculus**

Every point in the plane has exactly two polar coordinates. A)The statement is true because every point in the plane has a unique polar representation. B)The statement is false because left parenthesis r comma theta right parenthesis equals left parenthesis r comma theta plus ...

*January 12, 2017*

**Precalculus**

Find the magnitude and direction angle ? of the vector. u=4(cos102°i+sin102°j)

*January 11, 2017*

**Physics**

A ball with mass m=1kg and speed vo=5m/sec elastically collides with a stationary, identical ball (all resting on a frictionless surface so gravity is irrelevant). A student measures the top ball emerging from the collision at at speed vt=4m/sec at an angle ?t ? 37°. a) ...

*January 9, 2017*

**History**

Which adjective best describes Ming China’s position toward European trade? a.diplomatic b.equivalent c.inviting d.restrictive

*January 4, 2017*

**Math**

It takes Marty 1 1/4 hours to get ready for school. If 1/5 of that time is used to shower, what fraction of an hour does it take him to shower?

*January 3, 2017*

**stats**

If a student answers 40 multiple choice questions, each with four possible answers, by guessing randomly, the probability that she answers at least 15 correctly

*November 7, 2016*

**Math**

Place grouping symbols to make the equation true: 3x5-8+7-3/6=13

*November 3, 2016*

**calculus**

Cars on a certain roadway travel on a circular arc of radius r. In order not to rely on friction alone to over come the centrifugal force, the road is banked at an angle of magnitude 0 from the horizontal. The banking angle must satisfy the equation rg tan 0 = v^2 where v...

*November 3, 2016*

**calculus**

A patrol car is parked 50 feet from a long warehouse The light on the car turns at a rate of 30 revolutions per minute. How fast is the light beam moving along the wall when the beam makes the fol lowing angles with the line perpendicular from the light to the wall? (a)=...

*November 3, 2016*

**calclus**

A fish is reeled in at a rate of 1 foot per second from a bridge 15 feet above the water. At what rate is the angle between the line and the water changing when 25 feet of line is out? (Assume the fish stays near the surface of the water.)

*November 2, 2016*

**Calclus**

A point is moving along the graph of y = 1/(1 + x^2) so that dxldt = 2 centimeters per minute. Find dy/dt for the following values of x. (a) X = -2

*November 2, 2016*

**calclus**

A point is moving along the graph of y = 11(1+x2) so that dx/dt = 2 centimeters per minute. Find dy/dt for the following values of x. (a) X = -2 (b) X = 0 (c)X=2 (d)X=10

*November 2, 2016*

**calculus**

A point is moving along the graph of y = x2 so that dx/dt is 2 centimeters per minute. Find dy/dt when (a)x = 0 and (b)x = 3.

*November 2, 2016*

**Calculus**

All edges of a cube are expanding at the rate of 3 centimeters per second. How fast is the volume chang ing when each edge is (a) 1 centimeter and (b) 10 centimeters?

*November 2, 2016*

**calculus**

At a sand and gravel plant, sand is falling off a conveyor and onto a conical pile at the rate of 10 cubic feet per minute. The diameter of the base of the cone is approx imately three times the altitude. At what rate is the height of the pile changing when it is 15 feet ...

*November 2, 2016*

**Calculus**

A spherical balloon is inflated with gas at the rate of 20 cubic feet per minute. How fast is the radius of the balloon increasing at the instant the radius is (a) 1 foot and (b) 2 feet?

*November 2, 2016*

**Math**

The length of a rectangular board is 10 cm longer than its width. The width of the board is 26 cm. the board is cut into 9 equal pieces. What is the area of each piece? What are the possible dimensions of each piece?

*October 13, 2016*

**Physics**

If C⃗ = -5 i^ - 3 j^ - 4 k^, what is C⃗ × j^? If = -5 - 3 - 4 , what is × ?

*September 21, 2016*

**US history**

how did the Virginia colony survive with the help of the English colonists?

*September 19, 2016*

**Geometry**

A rectangular prism is measured 84 cm(l) x 42cm (w) x 56cm h. What is the largest size cube that fits the dimensions of the prism? Number of cubes required? Maximum length of the edge of the cube that fits 64cm, 42cm, and 56cm is _____cm. Number of cubes____

*September 9, 2016*

**Math**

simplify 10×10^4+2.8×10^6

*September 6, 2016*

**Statistics**

How do I answer: A normal distribution has a standard deviation equal to 39. What is the mean of this normal distribution if the probability of scoring above x = 209 is 0.0228

*September 1, 2016*

**Algebra**

I need some help on this math problem. 3c^2 - 5c - 7.8 = -2.2

*August 22, 2016*

**math**

does the bar around the x have anything to do with the problem.

*August 17, 2016*

**math**

im sorry the question is Write an integer for each expression: [x} if x = -12

*August 17, 2016*

**math**

can someone explain how to solve just not answer: IxI if x = 12 the I are a bar?

*August 17, 2016*

**Math**

On a 20 question math test, your teacher gives you five points for every correct answer and takes away one point for each incorrect answer. If you score 70 on the test, how many did you get correct?

*June 19, 2016*

**Math**

On a 20 question math test, your teacher gives you five points for every correct answer and takes away one point for each incorrect answer. If you score 70 on the test, how many did you get correct?

*June 19, 2016*

**Geometry**

Explain why knowing a combination of four pairs of equal sides or equal angles guarantees one of the congruence relationships.

*June 3, 2016*

**Math- Geometry**

Explain why knowing a combination of four pairs of equal sides or equal angles guarantees one of the congruence relationships.

*June 3, 2016*

**Math**

Prove that an exterior angle of a triangle is equal to the sum of the non adjacent interior angles of that triangle. Use the following variables in your proof. Exterior angle=w Interior adjacent angle= x Interior non adjacent angle1= y Interior non adjacent angle2= z

*June 2, 2016*

**Math**

A 2-digit number is twice the difference of its digits. What is the number?

*May 24, 2016*

**Math**

A 2-digit number is twice the difference of its digits. What is the number?

*May 24, 2016*

**Math**

Six apples cost as much as four pears. Each pear costs $4 more than each Apple. What is the cost of one pear?

*May 22, 2016*

**Calculus**

Evaluate as limit approaches 0. (Without using l'hopital's rule. ( Sqrt(4+sin(x))-2 ) / (3x)

*April 28, 2016*

**Chemistry**

Calculate the total amount of heat that must be added to convert 15.7g of ice at its melting point to steam at 100.0°C

*April 20, 2016*

**Science**

A transformer with 1890 turns in its primary coil has to decrease the voltage from 4620 V to 220 V for home use. How many turns should there be on the secondary coil?

*April 1, 2016*

**Physical Science**

A 20.0-Ù resistor and a 45.0-Ù resistor in parallel are connected to a 120-V dc source. (a) What is (are) the current(s) through the resistors? current through the 20.0-Ù resistor: Incorrect: Your answer is incorrect. . A current through the 45.0-Ù ...

*March 30, 2016*

**English**

Ms. Sue, it was A, you were wrong. I should have put what i thought.

*February 18, 2016*

**English**

Thanks, and is the second one A

*February 18, 2016*

**English**

Nine Haikus During a Drought In the dusty lane A frog waits for a puddle To fall from the sky Which form best describes this poem? A. limerick B. Haiku C. Concrete D. Narrative My choice is B. Haiku What about the poem best supports the answer to the previous question? A. It ...

*February 18, 2016*

**science**

A bullet of 29g is shot from a gun of mass 20kg with a muzzle velocity of 200ms if the bullet is 30cm long.determine. a)acceleration of the bullet b)the recoil velocity of the gun

*February 15, 2016*

**physics**

4. A gun’s bullet was launched horizontally with a speed 600m/s. It fell to the ground 300m away from the gun. a. How long was the bullets flight? b. At what height was the gun’s barrel at the moment of the shot? 5.

*February 9, 2016*

**physical science**

A golfer on a level fairway hits a ball at an angle of 38° to the horizontal that travels 85 yd before striking the ground. He then hits another ball from the same spot with the same speed, but at a different angle. This ball also travels 85 yd. At what angle was the ...

*February 1, 2016*

**Chemistry**

Given that ΔH (fusion) of water is 6025 J/mol, Cp,m(ice) = 37.7 J K–1 mol–1, and Cp,m(water,liquid) = 75.3 J K–1 mol–1, calculate ΔG (in J) for the freezing of 89 moles of water at 1 atm pressure and the constant temperature T = 14.4 °C. I got...

*January 28, 2016*

**engineering science**

calculate the work done required to push a car for 420 meters up an melon the force required to push the car is equal to 615n

*January 22, 2016*

**chemistry**

A sample of nitrogen has a volume of 50.0L at a pressure of 760mmHg. What is the volume of the gas at each of the following pressures if there is no change in temperature? A. 1500mmHg B. 4.00 atm C. 0.500atm

*January 14, 2016*

**Math**

$60

*January 13, 2016*

**Math**

Not sure how to solve 0.3x??

*January 13, 2016*

**Math**

How is that the ansswer. The discount was $18 it ask the original price of the coat with a 30% discount?

*January 13, 2016*

**Math**

Jane buys a coat that is $18 off the orinigal price. This is a 30% discount. What is the original price of the coat? Please explain how to get answer? Thanks

*January 13, 2016*

**math**

Don't get it I'm in 4th grade

*January 10, 2016*

**math**

Don't get it

*January 10, 2016*

**math**

Answer my question please

*January 10, 2016*

**math**

Taylor's home street address number has five digits. Two digits have values of 60,000 and 300.the last digit is 9.the value of each of the other digits is ten times the value of the digit on it's right. What's Taylor's home street address number.

*January 10, 2016*

**math**

Susie loves Starbucks coffe today,while waiting to place her order for her salted caramel macchiato , she noticed the prices for the three sizes that were available 12oz for $3.60 16oz for $4.96 20oz for $5.20 which size is the better unit rate

*January 9, 2016*

**Math**

Missing base 1/9= [. ] with exponent 2 please explain how I can get the answer thanks

*December 15, 2015*

**Math**

Missing exponent of 1/169=(1/13) please explain how I can find the missing exponent

*December 15, 2015*

**English**

Background Your favorite cousin has moved to your town and is looking for a job. Her previous experiences are working as a cashier and sales clerk at two department stores. You know she plans to apply at similar stores in your town. But you also know she is a perfect match for...

*December 5, 2015*

**math**

if i ran 1&5/8 mile and than later ran 9/10 of a mile what is the amount

*November 17, 2015*

**math**

Problem with your example is that the product of 4x5 is 20 then you would add the two zeros to complete the strategy giving the proper answer of 2000.

*November 10, 2015*

**Chemistry**

Apologies, the numbers corrected are: 40.0 ml of 2.50 M KOH to prep a solution that is 0.212 M

*October 23, 2015*

**Chemistry**

How many ml of water must be added to 40.0 ml of 2.50 m koh to prepare a solution that is 0.212 m?

*October 23, 2015*

**Math**

otto spent 3/4 of the money he had saved on a new video game. if the game cost $48, how much money did he have before he bought the game?

*October 22, 2015*

**Southridge**

What's the process if the input numbers are 1,2,3,4,5 and the output numbers are 2,5,10,17,26

*September 29, 2015*

**Math**

On a ruler that measures both metric and English units, we see that 1m=39.37 in. This implies that 2m = 78.74 in. Use this information to write an equation to convert x in. to y meters.

*September 28, 2015*

**math**

simplify: 5-(-3)^2 -6

*August 25, 2015*

**nyonithwele**

math: 38 learners at a high school,24play hockey,30play netball and 4play neither hockey nor netball.use venn diagram

*August 23, 2015*

**Physics**

Two charged particles have equal mass and carry charges of 2 nC and 3 nC respectively. They enter a magnetic field of strength 2 mT at the same velocity. Assuming that both particles exit the field parallel to each other and perpendicular to the field, determine the separation...

*August 14, 2015*

**physics**

the Apollo 10 spacecraft traveled at 11 km/s just prior o its re-entry, setting a speed record for humans. Suppose advanced technology raises the speed record by a factor of 100, to 1100 km/s. if a time travel of 1 hour elapsed on a ground-based clock, by how many seconds ...

*August 13, 2015*

**Math**

there are 600 fruits in a supermarket. If .64 are oranges and the rest are apples how many more oranges than apples are there

*July 8, 2015*

**calc**

I am having problem with the 1oo n. I know by taking the limit to the 1/n power gives me e in the denominator. How and what does (100n)^1/2n become?

*June 27, 2015*

**calc**

use the root test to to determine the convergence or divergence of the series 100n/e^n

*June 27, 2015*

**algebra**

bruh this girl says its wrong then doesn't put the right answer what the fffffff

*June 22, 2015*

**math**

1000ml x 15 gtt x 1 hr = 31 gtt 8hr ml 60 min How do you do this???

*June 15, 2015*

**English**

Dragonwings by Laurence yep What conflict is left unresolved at the end?

*June 7, 2015*

**7th grade English**

Both the authors of Zoos: Joys or Jails and the author of Why do we need Zoos : a. think animals should live in their natural habitat b.believe animals are protected in zoos c.wish people would make donations to zoos d. want to help wild animals, esp. endangered ones.

*June 4, 2015*

**math**

A 110lb woman is started on a nitroglycerin IV drip. The order is to administer the Nitro at mcg/min. The pharmacy sends a 250 ml IV container with 25 mg of nitro added to the container. What is the flow rate in ml/hr that the IV should run?

*June 1, 2015*

**math**

How many mls of 45% dextrose and 15% dextrose do you need to make 780 mls of 35% dextrose

*June 1, 2015*

**math**

How many mls of 55% Dextrsoe and water do you nee to make 980 mls of 27.5 Dextrose? No clue on what to do.

*June 1, 2015*

**Algebra 2 Honors**

You sure its not -3/81 = y/9? My answer came out as -1/3 and I solved in 2 different ways.

*May 11, 2015*

**Algebra 2 Honors**

Well, I'm having trouble on some of my homework questions and looking to get help as soon as possible on one of them about inverse variation. 1. If y varies inversely as x and y = -3 when x = 9, find y when x = 81. I will use the equation y = k/x but I have no idea how to ...

*May 11, 2015*

**Physics**

Consider a situation where immediately after birth, twins are separated. One continues to live on earth, while the other is whisked away in a space ship at 90% of the speed of light. After 65 years they are reunited. Will they look the same? Show proof of your answer through ...

*May 10, 2015*

**Physics**

Which of the following is correct for the two coherent light waves to produce zero light? The light waves should travel in perpendicular directions. The light waves are in phase with each other. The light waves are out of phase with each other. The light waves should pass ...

*May 10, 2015*

**Algebra**

It’s the end of the semester, and sisters Sarah and Chelsea are eager to head home for the summer. It’s a long drive, and Sarah’s old car can manage an average speed of only 55 miles per hour, so she leaves early in the morning. An hour later, Chelsea follows ...

*April 24, 2015*

**Algbra**

It’s the end of the semester, and sisters Sarah and Chelsea are eager to head home for the summer. It’s a long drive, and Sarah’s old car can manage an average speed of only 55 miles per hour, so she leaves early in the morning. An hour later, Chelsea follows ...

*April 24, 2015*

**math**

0.25 this website is a joke the answer was wrong

*April 15, 2015*

**math**

0.25

*April 15, 2015*

**english**

15. Identify the sentence in which the underlined pronoun is used incorrectly. There are only six days left in the school year. It will be fun to visit their house in the summer. Their just going to have to wait to see the movie. Greg refused to go there because of the bad ...

*April 10, 2015*

**chemistry**

first set 2.34*10-59= (5x)^5*(3x)^3(1x)^1 which is from the balanced equation. you will get 84375(x)^9=2.34*10-59= 8.67*10-8 mol/liter then you take the 502 grams/ mol and the 1 liter and multiple them all together to get 4.35*10^-5

*March 29, 2015*

**Physics**

A 1.42 kg ball is connected by means of two massless strings, each of length L = 1.29 m, to a vertical, rotating rod. The strings are tied to the rod with separation d = 1.29 m and are taut. The tension in the upper string is 48.0 N. What are (a) the tension in the lower ...

*March 14, 2015*

**Chemistry**

6Li(s) + N2(g) 2Li3N(s) a) What mass of lithium is required to produce 0.575 g of Li3N in the balanced reaction? b) What mass of nitrogen is required for the reaction? ------------------------------------------- I tried dimensional analysis in a couple different ways but I ...

*March 8, 2015*

**Math**

For the first of two basketball games the price of each reserved seat was $1.50,the price of each unreserved seat was 5 cents, and the number of reserved seats sold was 1/25 of the number of unreserved seats sold.If, at a second game, the price of the reserved seats is to be ...

*March 3, 2015*

**Chemistry**

What is the name of the substance with formula Cu(H2O)6SO4?

*February 17, 2015*

**Chemistry, HELP!!**

Write two hydrolysis reactions for Cu^2+ reacting with water in each step to form CuOH^+ and Cu(OH)2. The hydrolysis constants for the two reactions are: log kh1 = -7.7 and log Kh2 = -6.1

*February 8, 2015*

**physics**

An object falls a distance h from rest. If it travels 0.45h in the last 1.00 s, find the time and the height of its fall.

*February 6, 2015*

**physics**

A stone is dropped into a river from a bridge 43.8 m above the water. Another stone is thrown vertically down 1.65 s after the first is dropped. Both stones strike the water at the same time. What is the initial speed of the second stone?

*February 6, 2015*

**physics**

The figure gives the acceleration a versus time t for a particle moving along an x axis. The a-axis scale is set by as = 15.0 m/s^2. At t = -2.0 s, the particle's velocity is 7.00 m/s. What is its velocity at t = 6.0 s?

*February 6, 2015*

**Chemistry Please help !**

the unit is in amu unit

*February 4, 2015*