Saturday

October 1, 2016
Total # Posts: 383

**Chemistry**

0.250 g KCN is dissolved in 50 mL of water, and added to 2 mL of NaOH then mixed with 48mL of water. What is the molar concentration of KCN? I am stuck on this question. So far I have: 0.250gKCN/0.050L= 5M(g/L) Moles of KCN: 5M = mol/0.05L = 0.25mol KCN I am not sure exactly ...

*September 28, 2016*

**Chemistry**

If 100.0 mL of 0.171 M Na2SO4 are added to 100.0 mL of 0.889 M Pb(NO3)2, how many grams of PbSO4 can be produced? Equation: Na2SO4 + Pb(NO3)2 = 2NaNO3 + PbSO4

*September 22, 2016*

**Statistics**

Free Throw Freddie is an 80% free throw shooter. At the end of practice he shoots until he makes 10 shots. a) What is the probability that Freddie makes 10 in a row? b) What is the probability that Freddie needs 15 or more attempts? I understand how to do part a), but I'm ...

*September 11, 2016*

**Calculus**

The following equation defines y as a function of x. −5xy−3x=−6y

*September 9, 2016*

**Math**

A function f is defined by the equation f(x)=4x−8. Suppose that the state variables T and Q are related by this function according to the mapping f:Q↦T. Suppose that T=3. Use the equation of the function to find the value of Q.

*September 9, 2016*

**Math**

Player B longest home run distance is 500 feet there are 5280 feet in one mile how many home runs will player B need to hit at his longest distance for the total to be greater than 1 mile

*August 10, 2016*

**Math**

Player B longest home run distance is 500 feet there are 5280 feet in one mile how many home runs will player B need to hit at his longest distance for the total to be greater than 1 mile

*August 10, 2016*

**Math**

The 3 digit number in which the ones digit is three times the tens digit and the tens digit is three times the hundreds digit is?

*June 26, 2016*

**math**

A 97-cm board is cut into two pieces. If one piece is 35 cm shorter than the other, how long are the two pieces?

*March 9, 2016*

**Science**

1.) when might preserved remains of an entire organism form? A.) when sediment buries the hard part of an organism B.) when an event such as a quick burial or freezing preserves an entire organism ******* C.) when minerals replace parts of an organism D.) when a thin layer ...

*February 29, 2016*

**Science HELP PLS**

how are earth and venus similar? how is venus different from earth? provide two similarities and two differences

*February 26, 2016*

**AP Chemistry**

If 400 mL of 3.5 molar HCl solution is added to 200 mL of 2.3 molar NaOH solution, what will be the molarity of NaCl in the resulting solution? Answer in units of M.

*February 24, 2016*

**Social Studies**

where is the moon when you are in a location experiencing a low tide

*February 20, 2016*

**Social Studies**

more into detail please

*February 15, 2016*

**Social Studies**

how did the europeans feel about the founding of america

*February 15, 2016*

**Math**

Solve the inequality. Expression solution set using interval notation and graph the solution set using a number line. -15x+3<_-3(4x-7) Thats supposed to be a greater than or equal to sign lol

*January 29, 2016*

**Math**

Solve the inequality. Expression solution set using interval notation and graph the solution set using a number line. -15x+3<_-3(4x-7) Thats supposed to be a greater than or equal to sign lol

*January 29, 2016*

**Math**

Solve the inequality. Expression solution set using interval notation and graph the solution set using a number line. -15x+3<_-3(4x-7) Thats supposed to be a greater than or equal to sign lol

*January 29, 2016*

**Math**

Solve the inequality. Expression solution set using interval notation and graph the solution set using a number line. -15x+3<_-3(4x-7) Thats supposed to be a greater than or equal to sign lol

*January 29, 2016*

**Math**

Solve the inequality. Expression solution set using interval notation and graph the solution set using a number line. -15x+3<_-3(4x-7) Thats supposed to be a greater than or equal to sign lol

*January 29, 2016*

**physics**

You are on a hike in the mountains. You have 3.03 km left to go before your next campsite. The sun will set in 5.2 h. What average speed must you walk to get to camp at sunset? Answer in units of km/h.

*January 4, 2016*

**Science**

Describe circular motion. Which of Newton's laws helped you describe circular motion Plz I need help fast, thx!!

*December 15, 2015*

**Physics**

In a perfectly insulating container, what is the equilibrium state (temperature and phases) if one mixes 475 g of water vapor at 140 degrees Celsius with 25 g of ice at 0 degrees Celsius?

*December 12, 2015*

**physics**

Two blocks are arranged at the ends of a massless string as shown in the figure. The system starts from rest. When the 4.01 kg mass has fallen through 0.412 m, its downward speed is 1.3 m/s. The acceleration of gravity is 9.8 m/s 2 .

*December 9, 2015*

**physics**

What is the frictional force between the 5.66 kg mass and the table? Answer in units of N.

*December 9, 2015*

**physics**

What is the magnitude of F? Assume the acceleration due to gravity is 9.8 m/s 2 and the surface is frictionless. Answer in units of N.

*December 9, 2015*

**physics**

A load of 66 N attached to a spring hanging vertically stretches the spring 8.3 cm. The spring is now placed horizontally on a table and stretched 11 cm. What force is required to stretch it by this amount? Answer in units of N.

*December 9, 2015*

**physics**

The acceleration of gravity is 10 m/s2. What is the acceleration of a 46 kg pail of cement that is pulled upward (not sideways) with a force of 478 N? Answer in units of m/s2.

*December 7, 2015*

**physics**

On planet X, an object weighs 18.1 N. On planet B where the magnitude of the free-fall acceleration is 1.28 g (where g = 9.8 m/s 2 is the gravitational acceleration on Earth), the object weighs 37.9 N. The acceleration of gravity is 9.8 m/s 2 . What is the mass of the object ...

*December 7, 2015*

**AP Chemistry**

The reaction of 5.1 grams of fluorine with excess chlorine produced 4.5 grams of ClF3. What percent yield of ClF3 was obtained? Answer in unites of %

*December 2, 2015*

**math**

The diagonal of a rectangular storage room is 4 yards long. If its length is 2 times its width, find the dimensions of the room.

*November 29, 2015*

**physics**

Your car is stuck in a mud hole. You are alone but you have a long strong rope. having studied physics you tie the rope tautly to a telephone pole and pull on it sideways at the midpoint as shown. Find the force exerted by the rope on the car when the anle is 3.2 and you are ...

*November 23, 2015*

**physics**

The distance between two telephone poles is 31 m. When a 1.54kg bird lands on the telephone wire midway between the poles, the wire sags 0.165 m. The acceleration of gravity is 9.8 m/s^2. How much tension in the wire does the bird produce? Ignore the weight of the wire.

*November 23, 2015*

**Physics**

The 1.1 kg physics book is connected by a string to a 250 g coffee cup. The book is given a push up the slope and released with a speed of 2.9 m/s . The coefficients of friction are μs =0.50 and μk =0.20. What Distance does it travel up the slope? I drew a free body ...

*October 7, 2015*

**physics**

A 57.5-kg runner has a speed of 5.80 m/s at one instant during a long-distance event. (a) What is the runner's kinetic energy at this instant? 967.15 J (b) If he doubles his speed to reach the finish line, by what factor does his kinetic energy change? im having trouble ...

*October 5, 2015*

**English **

What are the differences between mood and tone?

*October 5, 2015*

**Social Stuides**

What is one way that the United Nations shapes world affairs

*September 28, 2015*

**Social Stuides**

Write at least one way that the United States has influenced another nation-state and at least one way that another nation-state has influenced the United States.

*September 26, 2015*

**physics**

A knight sits on a castle wall during a siege.To while away the time, he notes that boulders catapulted from below land on the top of his wall with a vertical velocity of 9.9 m/s. If he is 35 m above the catapult, what is the initial velocity of the boulders? Theacceleration ...

*September 25, 2015*

**physics**

A ball is thrown straight up and reaches a maximum height of 7.16 m. What was its initial speed? The acceleration of gravity is 9.8 m/s Answer in units of m/s.

*September 25, 2015*

**4th grade math word problem**

tim is 27 years older than tom. the sum of their ages is 337. how old is ti,?

*September 13, 2015*

**Biology**

The answer is waters high specific heat. the specific heat is a measure of how well a substance resists increasing temperature. the higher the number, the better it is at resisting that heat. So on a hot day, the water wont just cook the fish

*September 9, 2015*

**heith**

Shirley has two containers of water for a camping trip. One container holds 2 times as much as the other. The total amount of water is 30 gallons. How much water is in each container?

*August 28, 2015*

**science**

A ball with a mass of 3.47 kg is rolling along at 17.4 m/s. If you apply a force of 52.2 N to it, how many seconds will it take to stop?

*May 28, 2015*

**chemistry**

How many grams of solid ammonium chloride should be added to 1.50 L of a 0.224 M ammonia solution to prepare a buffer with a pH of 8.720 ?

*April 3, 2015*

**College Algebra**

A rectangular garden next to a building is to be fenced on three sides. Fencing for the side parallel to the building costs $60 per foot, and material for the other two sides costs $20 per foot. If $1,500 is to be spent on fencing, what are the dimensions of the garden with ...

*March 26, 2015*

**Algebra 2**

solve 3 square root 2x +1 =3 2x +1 under the sqaure

*March 11, 2015*

**Algebra 2**

solve square root 5-2x + 5 =12 5-2x under the sqaure

*March 11, 2015*

**Algebra 2**

solve square root 2x-5 =7 the 2x -5 is under the sqaure

*March 11, 2015*

**math**

A store sells one model of bicycle for $250. a. Write an expression for the amount of money the store receives if it sells b bicycles. b. How much would the store make if it sells 5 bicycles.

*February 24, 2015*

**Algebra 2**

divide using long division. (6x^2+4x-16)/(2x-2)

*February 10, 2015*

**Algebra 2**

solve each equation. x^4-81=0

*February 10, 2015*

**Algebra 2**

find the real solutions of each equation by graphing. 15x^4=11x^3+14x^2

*February 10, 2015*

**Algebra 2**

find the real solutions of each equation by graphing. 2x^4=9x^2-4

*February 10, 2015*

**Algebra 2**

Solve each equation. x^4 -x=0 x^4-81=0

*February 9, 2015*

**Algebra 2**

find the real solutions of each equation by graphing. 2x^4=9x^2-4 15x^4=11x^3 + 14x^2

*February 9, 2015*

**Physics**

A projectile is launched at 5.4 m/s with an initial angle of 22 degrees from an initial height of 2.6 meters. Where will it land? How fast, and at what angle will it be going when it hits the ground?

*February 8, 2015*

**Chemistry**

Draw the Lewis structure for each of these molecules. 1. PH3 2. H2S 3. HCl 4. CCl4 5. SiH4

*January 28, 2015*

**Chemistry**

A quantity of ice at 0.0 °C was added to 33.6 g of water at 45.0 °C to give water at 0.0 °C. How much ice was added? The heat of fusion of water is 6.01 kJ/mol, and the specific heat is 4.18 J/(g•°C).

*January 26, 2015*

**physics**

LNAJNDWAD

*January 15, 2015*

**Algebra 2**

thanks

*January 14, 2015*

**Algebra 2**

find the factored forms of each expression. -9x^2 - 100

*January 14, 2015*

**Algebra 2**

suppose y varies directly with x and y=1 when x= -3. what is the constant of variation? what is x when y=4?

*December 16, 2014*

**Algebra 2**

what are the x and y intercepts of 2x +4y =8?

*December 16, 2014*

**Algebra 2**

find the slope of each line. a. y= 2x-3 b. 3y=7x =1

*December 16, 2014*

**Algebra 2**

write the compound inequality 3.1 less then or equal to m less than or equal 4.7 as an absolute value inequality.

*December 16, 2014*

**Algebra 2**

solve ax -3x + 5 = a+b for x. state any restrictions on the variables.

*December 16, 2014*

**Algebra 2**

thanks

*December 16, 2014*

**Algebra 2**

write an equation to solve the problem. find three consecutive even numbers whose sum is 144

*December 16, 2014*

**Algebra 2**

yes that's the equation

*December 10, 2014*

**Algebra 2**

write each function in vertex form f(x) =-2x^2 =6x + 10

*December 10, 2014*

**Algebra 2**

what is the positive solution of the equation 1/2x^2 -3x =5? solve by using a table or by graphing. if necessary, round your answer to the nearest hundredth.

*December 8, 2014*

**Algebra 2**

what is the positive solution of the equation 3x^2 - 5x - 7 =0? solve by using a table or by graphing. if necessary, round your answer to the nearest hundredth.

*December 8, 2014*

**Algebra 2**

what is the positive solution of the equation x^2 - 3x = 1? solve by using a table or by graphing. if necessary, round your answer to the nearest hundredth.

*December 8, 2014*

**Algebra 2**

what is the positive solution of the equation 5x^2 + 2x -16 =0? solve by factoring.

*December 8, 2014*

**Algebra 2**

what is the positive solution of the equation x^2 = 2x + 35? solve by factoring.

*December 8, 2014*

**Math**

1/24

*December 4, 2014*

**chemistry**

calculate the molarity of a g NaCl in 250 ml solution.

*November 25, 2014*

**Chemestry**

50 protons

*August 1, 2014*

**Math**

If the largest two-digit number is added to 200, what is the sum?

*July 7, 2014*

**algebra**

I need some help with ln 's I am trying to solve : ln(x+3)- ln(x-5)= ln7 do I: ln (x+3)/(x-5)= ln 7 ?

*April 11, 2014*

**physics**

A passenger weighing 800 N is inside an elevator weighing 25000 N that rises 30 m in exactly 1 min. How much power is needed for the elevator's trip?

*March 27, 2014*

**Math**

hmmm

*March 16, 2014*

**physics**

How much time does it take a pulse of light to travel through 180\({\rm {\rm m}}\) of water?

*January 20, 2014*

**Finite**

An urn contains 5 white balls and 4 black balls. If 3 balls are randomly selected ( at once, without replacement ), what is the probability that at least 1 ball is black? Give answer as a decimal number with three correct decimal places.

*November 14, 2013*

**math**

arrays and an expanded algorithm 23 x17 how do I solve this

*November 5, 2013*

**calculus and vectors**

------------------------------------- \.56 degree ...........45 degree.../ \................................/ \............................../ \............................/ \........................../ \......................../ \______________________...

*September 26, 2013*

**calculus and vectors**

Reiny, I do not see how your calculation = 65.88, I get 25.2. Also, I do not understand your diagram. It looks like this ------------------------------------- \ 56 degree 45 degree / \ / \ / \ / \ / \ / \______________________/ | | | 35 newtons | | | |_____________________|

*September 26, 2013*

**probability**

A random sample of six integers in the interval [1,42] is to be drawn. The numbers are selected randomly, one after the other, and repeats are allowed. What is the probability the six numbers in the sample will all be different?

*September 4, 2013*

**math**

A very small population consists of 7 units, labeled a; b; c; d; e; f; g. How many different samples of size 3 are there, for sampling without replacement, assuming that (a) samples are lists of units. (b) samples are sets of units.

*September 3, 2013*

**Biology**

What does the notation 4n = 28 tell you about how many types of chromosomes there are and how many of each type of chromosome are present in a cell? I am a little confused on how this is determined. Would it be 4 sets of chromosomes with 7 of each type of chromosome?

*August 24, 2013*

**math**

Shelly delivers the weekly local paper to neighborhoods in her town. House numbers are even on one side of the street and odd on the other. Shelly delivers an equal number of papers to both sides of the street. Although she always aims for the front doorstep, Shelly typically ...

*July 21, 2013*

**math**

Kalil flipped a coin sixty times. He got thirty-four heads. How does this result compare to the number of heads you would have expected based on theoretical probability?

*July 18, 2013*

**math**

Shelly delivers the weekly local paper to neighborhoods in her town. House numbers are even on one side of the street and odd on the other. Shelly delivers an equal number of papers to both sides of the street. Although she always aims for the front doorstep, Shelly typically ...

*July 18, 2013*

**MacroEconomics**

12

*July 15, 2013*

**algebra 1**

What is the solution set of the given equation? 4y - 6y + 9y = -2

*July 13, 2013*

**algebra 1**

Which of the following equations has the given solution set? Solution set: Ø

*July 13, 2013*

**algebra 1**

Which of the following would eliminate the variable on the left side of the given equation? 36 - 19w = -6w + 41

*July 13, 2013*

**Physics**

A tennis ball may leave the racket on a serve by a top player with a speed of 45.0 m/s. If the ball's mass is 0.063 kg, and it is in contact with the racket for 0.030 s, what is the average force (in newtons) on the ball?

*July 12, 2013*

**Physics**

A 17000 kg railroad car travels along on a level frictionless track with a constant speed of 23.0 m/s. A 5100 kg additional load is dropped onto the car. What then will be its speed in meters/second?

*July 10, 2013*