Wednesday

October 26, 2016
Total # Posts: 595

**Chemistry **

What is NaOH?

*October 25, 2016*

**Math**

A sample of 120 bags of potatoes produced by a factory was found to have a mean weight of 2.47 kg and a standard deviation of 0.12 kg. Obtain a 95% confidence interval for the mean weight of all bags of potatoes produced by the factory.

*October 24, 2016*

**Physics**

Movers are looking to lower a cabinet out of an open window to a mattress on the ground below. One end of a rope is tied to a 188 kg dresser, looped through a pulley, and the other end of the rope is tied to a cabinet. If the coefficient of kinetic friction between the dresser...

*October 20, 2016*

**Algebra**

Tire pressure is directly proportional to temp on a temp scale where zero degrees is absolute zero. given that temp in degrees celcius and degrees Fahrenheit are related by the formula F=9/5C +32 and absolute zero is -273.15C, by what % does tire pressure decrease when the ...

*October 18, 2016*

**Mathematics**

If we require a margin of error of x% for the sample size n, express n in terms of x.

*October 18, 2016*

**Physics**

Never mind, I figured it out as normal force is really simple but the distance part was confusing me. Thanks for reading it anyway.

*October 17, 2016*

**Physics **

A 2260kg truck drives East with a constant velocity of 18m/s. It comes to a stop after traveling 123m. What is the noraml force exerted by the road on the truck? Also, is the distance travelled essential to solve the problem or is unnecessary information?

*October 17, 2016*

**Math**

X is a normal variable with mean 9. If P(X > 12) = 0.0062, calculate the standard deviation, the standard deviation if X.

*October 15, 2016*

**math**

60% of the students in a school are boys. 70% of the boys and 40% of the girls wear glasses, how many students are there in the school?

*October 14, 2016*

**Math**

If P(a<X<b) = 0.48 and P(0<X<a) = 3 x P(b<X<12), calculate P(b<X<12) and calculate P(0<X<b).

*October 6, 2016*

**history**

explain the relationship of Spindletop's location in Texas to it's importance on the economic development of Texas and the United States.

*October 5, 2016*

**Math**

During the Great Singapore Sale, Mr. Chen bought a digital camera for $810. This was 90% of the usual price How much was the discount

*October 3, 2016*

**Physics**

You're driving parallel to train tracks at 40.0 km/h when a train passes you, going a steady 105 km/h. A track crossing is up ahead, so you begin to speed up at 6.50 m/s2. How far do you drive before you pass the train?

*October 2, 2016*

**Calc AB**

Given y=32t2 +16t+64, what is D2/t [y]? A.-64 B.-32 C.16 D.-64t+6**

*October 2, 2016*

**Physics**

A wind turbine rotates at 8.40 rpm and has an angular acceleration of 0.0326 rad/s2. If the wind turbine takes 27.0 s to come to a complete stop, how many revolutions will this take?

*September 29, 2016*

**Physics**

A quarter on a spinning vinyl record has a centripetal acceleration of 31.8 m/s2. What is the acceleration of the quarter if it is placed twice as far from the centre of the vinyl record?

*September 29, 2016*

**Math**

a pie chart is drawn to represent the numbers x,2x and x+4. If the angle at the centre representing x is 75 degrees, find x

*September 27, 2016*

**Maths**

a pie chart is drawn to represent the numbers x,.2x.and x+4. If the angle at the centre representing x is 75 degrees, find x.

*September 27, 2016*

**math **

a respie requires 2 cups of flour to make 10 servings and 8 cups of flour to make 40 servings. How many cups of flour are needed to make 30 servings

*September 23, 2016*

**Math :)**

A pie chart is drawn to represent the numbers x, x+2 and 8. If the angle at the centre of the sector representing x+2 is 120 degrees, find the value of x.

*September 21, 2016*

**Math **

Does expressing a number in scientific notation change the value of the number (being expressed)?

*September 15, 2016*

**Math**

A fair eight-sided die is rolled six times. A success is getting a 6, 7 and 8. Find the probability of getting three successes.

*September 13, 2016*

**Math**

A fair coin is tossed six times. Find the probability of getting head, head, head, head, tail, tail in that order

*September 12, 2016*

**maths **

Seven times a certain number is the same as nine more than four times the same number. Find the number.

*September 12, 2016*

**Math **

A bag contains 8 white, 6 black and 4 red discs. They are selected at random and not replaced. What is the probability that there is at least one black disc in the first four discs drawn out of the bag?

*September 9, 2016*

**Math**

Six points lie on the circumference of a circle. How many different triangles can be drawn having some of these points as vertices?

*September 1, 2016*

**Math**

A rectangular garden is 30 m long and 20 m wide. A path of uniform width is set around the edge that reduces its area to 375m^2. What is the width of the path?

*August 28, 2016*

**English **

Wilfrid Laurier, John A. Macdonald, Queen Elizabeth II, William Lyon Mackenzie King, ______ ______.

*August 12, 2016*

**Maths**

Alice & Phillis share some stickers. Alice has 5/7 as many stickers as Phyllis. Phyllis has 92 more stickers than Alice. How many stickers does Alice have?

*August 9, 2016*

**Math**

The temperature is 12 degrees lower that 4 hours ago. Write an integer equation for the situation and what is the average temperature change per hour? 12/4= 3 3 degrees is the average temperature change per hour.

*July 17, 2016*

**History**

Sorry It should be were the reformation and counter-reformation popular movements OR the carefully orchestrated manipulations of charismatic figures or both?

*June 29, 2016*

**History **

were the reformation and counter-reformation popular movements of the carefully orchestrated manipulations of charismatic figures or both? Why?

*June 29, 2016*

**chemistry**

You have a solution that contains 0.25g grams of oxalic acid dissolved in 100 mL of water. This solution is placed in a separating funnel, and the 100 mL of butanol is added to the solution. calculate the mass of oxalic acid in the organic solvent

*June 16, 2016*

**algebra**

$8000 principle earning 3% componded annually, 4 years. What will be the balance after 4 years?

*May 24, 2016*

**science**

PLz help

*April 28, 2016*

**science **

which of the following does not change when a car keeps a constant speed but changes direction

*April 28, 2016*

**life orietations**

Six ways that the human rights violations influences individuals and the broader south Africa community

*April 25, 2016*

**Life orientation**

Examples of human rights violations

*April 17, 2016*

**math**

A homeowner is selecting a pool with a perimeter of 54 meter to place in his back gard. Find the perimeter of the pool If the dimensions are cut in half.

*April 14, 2016*

**Chemistry**

Suppose a saturated solution of barium fluoride contains 1.5 x 10 ^ -2 M of F-. What is the Ksp of BaF2. I know that the balanced equation of this reaction is: BaF2 (s) --> Ba2+ (aq) + 2F- (aq) There is a 1:1 ratio between BaF2 and Ba2+ and there is a 1:2 ration between ...

*March 31, 2016*

**Math**

A recipe requires 3/4 cup of nuts for 1 cake. Enter the maximum number of cakes that can be made using 7 1/2 cups of nuts.

*March 30, 2016*

**Math**

A recipe requires 3/4 cup of nuts for 1 cake. Enter the maximum number of cales that can be made using 7 1/2 cups of nuts.

*March 30, 2016*

**physics 101 **

A truck is moving at the speed of 30 miles per hour, what is it's speed in meter per second.

*March 20, 2016*

**math**

What is the volume of the cone in the picture if S = 5 and R = 3?

*March 6, 2016*

**Operations Management**

Consider the following system: -> 0.73 -> 0.73 -> Determine the probability that the system will operate under each of these conditions: (Round your final answers to 4 decimal places, not your intermediate calculations.) a.) The system as shown b.) Each system ...

*March 6, 2016*

**Chem**

Write the formulas of the compounds formed by Pb4+ with the following anions: CN−, ClO3−, SO42−, H2PO4−.

*March 4, 2016*

**Science **

What caused the ten years war

*March 4, 2016*

**4th grade math**

1/2

*March 4, 2016*

**Statistics**

In a shipment of 21 parts, four of the parts are defective. If three parts are selected at random without replacement, find the probability that : a.) All three parts selected are defective. 4/21*3/20*2/19=.003 b.) None of the tree parts selected are defective. 3/17*2/16*1/15...

*February 26, 2016*

**Life Orientation**

Crime

*February 21, 2016*

**social studies **

1. Many agree that Native Americans migrated from Asia as early as _______ years ago. (1 point) 2,000 5,000* 30,000 100,000 2. What country controlled the majority of the Americas in 1783? (1 point) Great Britain* France Spain Native American 3. The Treaty of _______, signed ...

*February 16, 2016*

**Math**

There is a bridge that is 1 mile long. You have a piece of steel cable that measures 1 mile and 1 inch. You get 2 very strong people to hold each end of the cable and stand at the ends of the bridge. You, also very strong, stand at the exact middle of the bridge and hold the ...

*February 15, 2016*

**English III**

That is correct. (Answer D)

*February 15, 2016*

**math**

7893.27

*February 15, 2016*

**11Science**

In spermatogenesis four sperm cells are produced from the original spermatocyte, while in oogenesis only one egg cell is produced from the original oocyte. Explain two reasons why this design increases the likelihood of fertilization and pregnancy.

*February 11, 2016*

**physical science**

a car accelerates from rest at stop street and covers 10m east in 45.calculate the acceleration of the car(assume uniform acceleration).

*February 10, 2016*

**chemistry**

A 7.30-L container holds a mixture of two gases at 45 °C. The partial pressures of gas A and gas B, respectively, are 0.410 atm and 0.620 atm. If 0.150 mol of a third gas is added with no change in volume or temperature, what will the total pressure become?

*February 4, 2016*

**Physics**

A man uses a lever jack to lift a 2.00 × 10^3 kg car to change a tire. Each stroke of the jack lifts the car a distance of 5.00 × 10^(-3) m. The vertical displacement of the handle is 0.75 m for each stroke. How much total force does he use with each stroke of the ...

*January 28, 2016*

**math**

The population of Town A is 60000 and town B is 70000. Find the percentage of town A as town B

*January 27, 2016*

**maths**

The population of town A is 60000 and town B is 70000 find the percentage of town A as town B

*January 27, 2016*

**Physics**

An automobile traveling 50km/hr. It decelerates at 5 meter per second square. How long will it take to stop the car? How far will the car travel after a brakes are applied?

*January 11, 2016*

**Phiysics**

An automobile traveling 50km/hr. It decelerates at 5 meter per second square. How long will it take to stop the car? How far will the car travel after a brakes applied?

*January 11, 2016*

**Math**

Two parallel chords of length 20cm and 11cm lie on opposite sides of a circle. The distance between the two chords is 15cm. Calculate, correct to the nearest whole number the radius of the circle

*January 8, 2016*

**math**

Find the radius of the circle if an arc of length 8 ft on the circle subtends a central angle of 225°

*December 8, 2015*

**Math**

Ok so really all you have to do is multiply 5 by 2 and add a dollar sign. 2 times 5 is 10 so he spent $10.00

*December 7, 2015*

**chemistry**

how many grams of the solid can be formed from 206g of calcium nitrate and 140 g of phosphoric acid? answer in grams. I really need help and fast.

*December 3, 2015*

**Pre algebra**

Tropical storm alpha has winds of 50 miles per hour. Write and solve and an inequality to find how much of the winds need to decrease so that the storm is downgraded to 39. Please help, explain steps

*December 1, 2015*

**Social Studies**

When the Industrial Revolution started people replaced those who made things by hand with machines therefor the poor lost their jobs. The answer is B.

*December 1, 2015*

**Social Studies Check My Work**

I go to connections too and this is a quiz. You posted the entire quiz and I think you need to actually read the assingment and then take the quiz yourself WITHOUT having someone do it for you.

*November 25, 2015*

**HEALTH PLEASE HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!**

Answers are B and C, D, A, C, and D. Just took the quiz.

*November 25, 2015*

**MATH**

Thank You I Got an 80

*November 5, 2015*

**MATH**

Simplify square root of 3 times square root of 21. A.Square root of 24 B.Square root of 63 C.3 Square root of 7 D.None of the above

*November 5, 2015*

**math**

Later 7 students joined group 2 (41 students)and one student left to join group 1. (44 students) Now 20 students play trombone and 7 more students play trumpet as play saxophone. How many students play each instrument?

*November 4, 2015*

**math**

A garden has a rectangular pool in it with a width that is twice its length. If the land around the pool is 4 meters on all sides and the total area of the land is 136 m^2, what are the dimensions of the pool?

*November 1, 2015*

**algebra**

A train leaves Orlando at 3:00 PM. A second train leaves the same city in the same direction at 5:00 PM. The second train travels 20 mph faster than the first. If the second train overtakes the first at 10:00 PM, what is the speed of each of the two trains?

*October 20, 2015*

**Math**

I think that the customer gave too little money. That's all I know...

*October 14, 2015*

**Math**

If Jack has 2 pencils, and Mr. Youn has 30 times, that would mean you have to do 30 times 2, right? And then, the whole school has 200 times as many as Jack, so in order to find out how much pencils the whole school has, you must do 30 times 200.

*October 14, 2015*

**5th grade Math**

Is the Distributive Property of (5*600)+(5*400) (600+400)5? I'm not really sure...please help...

*October 12, 2015*

**Math**

What is the distributive property of (5*600)+(5*400)?

*October 12, 2015*

**Math**

What is the Distributive Property?

*October 12, 2015*

**Math**

Biruk wants to buy a book for $15.25 and a book for $4.85. He wants to pay with one $20.00 bill. Use estimation to decide whether this is reasonable or not. Explain what place value to round for an estimate this is useful in this situation.

*October 12, 2015*

**math**

When six standard six-sideddice are rolled,what is the most likely sums of the six number?

*October 7, 2015*

**math**

When a six-sided dice numbered1,2,3,4,5and 6 is rolled many times until thesum is greater than12,what is the least likely sum?

*October 7, 2015*

**math**

On a standard six-faced die,the numbers of the opposite faces always add to seven,Dena rolls a pair of fair,standard six-faced dice.She then takes the product of four numbers ,the two numbers on the faces that are showing on top of the dice and the two numbers on the faces ...

*October 7, 2015*

**math**

If four standard six-sided dice are rolled,what is the probability that the sum of the number on the top faces is 22, or 23,or 24,.express your answer as a common fraction

*October 7, 2015*

**Pre-Algebra**

Which exponent makes this statement true? One fifth to the ninth power equals five to what power? A) 9 B)-9 C) 1/9 D)-1/9

*October 1, 2015*

**Language Arts**

Thank you!

*September 29, 2015*

**Language Arts**

What does the aunt in The Story Teller find improper about the bachelor's story? A. It makes fun of Bertha's goodness B. It has too many fantasy elements C. It unrealistically suggests that virtue is always rewarded D. The bachelor tells it without invitation, ...

*September 29, 2015*

**Science please check my answer**

Never mind!

*September 29, 2015*

**Science please check my answer**

Which of the following fossil types is best described as forming when minerals replace all or part of an organism's body? A) A mold B) A petrified fossil*** C) A cast D) A trace fossil

*September 29, 2015*

**Science**

Thank you!

*September 29, 2015*

**Science**

What has the study of fossils allowed scientists to do? A) Describe the past environments and the history of life. B) Study present ocean temperatures at different depths C) Analyze the chemical compositions of sedimentary rocks and minerals. *** D) Predict which organisms ...

*September 29, 2015*

**Pre-Algebra**

1 1/2?

*September 28, 2015*

**Pre-Algebra**

What is the sum of 5/6+2/3? A)1 1/3 B)1 1/2 C)1 2/3 D)1 3/4

*September 28, 2015*

**Science PLEASE help!**

THANK YOU!!!

*September 28, 2015*

**Science PLEASE help!**

What is the difference between a scientific theory and a scientific law?

*September 28, 2015*

**Science**

A student measures a room to be 20.0m*17.16m. Which of the numbers below represents the room's area with the correct number of significant figures? A) 340 meters squared B) 343 meters squared C) 343.2 meters squared D)343.20 meters squared

*September 28, 2015*

**Science**

Why do scientists use models of natural science? A) Scientists use models of natural systems because these systems are often too large, too small, or too complex to study directly B) Scientists use models of natural systems because they like to use art in science. C) ...

*September 28, 2015*