Monday

July 6, 2015

July 6, 2015

Total # Posts: 442

**Math**

(2y-3)(3y-2) A. 6y2-13y+6 B. 6y2-13y-6 C. 6y2+13y-6 * D. 6y2+13y+6 *my answer (btw the 2 next to 6y is an exponent) I think that it is C, but I want to be sure that it is correct.
*May 29, 2015*

**Chemistry**

A 1.76g sample of quinone, C6H4O2, is burned in a calorimeter whose total heat capacity is 7.854 kJ/C. The temperature of the calorimeter increases from 23.44 C to 29.14 C. What is the heat of combustion per mole of quinone? The molar mass of quinone is 108.1 g/mol. The answer...
*May 20, 2015*

**statistics**

A sample of 65 night-school students' ages is obtained in order to estimate the mean age of night-school students. x bar = 25.2 years. The population variance is 28. (a) Give a point estimate for ì. (Give your answer correct to one decimal place.) Correct: Your ...
*May 14, 2015*

**Math**

Ok, thanks so much for the help! =)
*May 11, 2015*

**Math**

What is the equation of the line that passes through the point (-2,3) and that is perpendicular to the line represented by 3x-2y=-2? A. 2x+3y=5 B. 2x+3y=7 C. -2x=3y=5 D. 3x-2y=-12 I think that the answer is D, but I am not too sure about it.
*May 11, 2015*

**chemistry**

How many grams of CuSO4 . 5H2O are needed to prepare 100ml of a 0.10M solution? Remember to change the given volume to liters and take the moles and convert them to grams via the molar mass to get grams of CuSO4 . 5H2O
*April 20, 2015*

**Chemistry**

In a chain mechanism, a reaction in which two free radicals combine to form a stable molecule would be called the A) initiation step B) termination step C) propagation step D) inhibition step E) branching step
*April 7, 2015*

**Chemistry**

If the reaction 2NO + 2H2 --> N2 + 2H2O occurred in just a single step, the overall order of the reaction would be A) 1 B) 2 C) 3 D) 4 E) 5
*April 7, 2015*

**Chemistry**

Concentration of KCl is 0.04 M and NaCl is 0.06 M
*April 7, 2015*

**Chemistry**

What would the answer be to the second part? Explain why the solubility of KHTar in the mixed KCl- NaCl solution differs from that in 0.100 M NaCl
*April 7, 2015*

**Chemistry**

It was a solubility lab for KHTar
*April 7, 2015*

**Chemistry**

As the concentration of KCl in a solution increases, the solubility of KHTar ______________ because ___________________
*April 7, 2015*

**Chemistry**

Explain why the solubility of KHTar in 0.100 M NaCl solution differs from that in pure water? Explain why the solubility of KHTar in the mixed KCL - NaCl solution differs from that in the 0.100 M NaCl.
*April 7, 2015*

**6th grades math**

Alyssa's shelves hold 31 books each. How many shelves will Alyssa need if Alyssa has 248 books?
*February 8, 2015*

**Math**

I got 555 mph but I don't know if it's correct
*January 20, 2015*

**Math**

Two trains are traveling opposite directions. One train travels at a speed of 90 mph. The second train travels at a speed of 95 mph. The 2 trains travel for three hours. How far apart are the 2 trains?
*January 20, 2015*

**Math **

This regular octagon has a side length 15.0cm. Determine the distance from one vertex to the opposite vertex, measured through the centre of the octagon. Give your answer to to the nearest tenth of a centimeter.
*January 15, 2015*

**physics**

Elephants communicate via infrasound, at frequencies as low as 11 Hz that can travel up to 9 km. The intensity of these sounds can reach 106 dB, measured a distance of 4 m from the source. a) Determine the intensity level in W/m2 of the infrasound at 4 m from the source. b) ...
*December 1, 2014*

**physics **

Assume that there is no friction between m2 and the incline, that m2 = 1.8 kg, m1 = 1.4 kg, the radius of the pulley is 0.10 m, the moment of inertia of the pulley is 3.6 kg m2, and θ = 27.0°. Mass 1 is hanging vertically while mass 2 is on the incline. After mass 2 ...
*November 29, 2014*

**chemistry**

In a constant-pressure calorimeter, 55.0 mL of 0.310 M Ba(OH)2 was added to 55.0 mL of 0.620 M HCl. The reaction caused the temperature of the solution to rise from 22.23 °C to 26.45 °C. If the solution has the same density and specific heat as water, what is ΔH ...
*November 19, 2014*

**English**

What are the answers for chapter 9? Final Check: Money Problems
*November 18, 2014*

**Science 8A Check Answers**

Thank you.
*November 17, 2014*

**Science 8A Check Answers**

Will someone please check my answers as I need lots of help in science. 1. Which of the following is an example of matter? A. leaves B. shadow C. light from the sun* D. sound 2. Which of the following is an example of a chemical property of matter? A. ability to melt B. ...
*November 17, 2014*

**chemistry**

Which of the following reactions have a positive ÄSrxn? Check all that apply. A(g) + B(g)--> C(g) 2A(g) + B(g)--> 4C(g) A(s) + B(g)--> 2C(g) 2A(g) + 2B(g)--> 3C(g)
*November 2, 2014*

**Chemistry **

Which of the following reactions have a positive ÄSrxn? Check all that apply. A(g) + B(g)--> C(g) 2A(g) + B(g)--> 4C(g) A(s) + B(g)--> 2C(g) 2A(g) + 2B(g)--> 3C(g)
*November 2, 2014*

**chemistry**

Which of the following reactions have a positive ÄSrxn? Check all that apply. A(g) + B(g)--> C(g) 2A(g) + B(g)--> 4C(g) A(s) + B(g)--> 2C(g) 2A(g) + 2B(g)--> 3C(g)
*November 2, 2014*

**math**

A pair of blocks of the mass M =30.7 kg, and 2 M are dragged over a rough, horizontal surface by two constant forces of magnitude F=98.0 N. The angle α = 22.7 ° . The blocks are displaced 7.5 m, and the coefficient of kinetic friction is 0.258. *for the normal force ...
*October 15, 2014*

**Physics**

A pair of blocks of the mass M =30.7 kg, and 2 M are dragged over a rough, horizontal surface by two constant forces of magnitude F=98.0 N. The angle α = 22.7 ° . The blocks are displaced 7.5 m, and the coefficient of kinetic friction is 0.258. *for the normal force ...
*October 15, 2014*

**Physics**

A bush baby, an African primate, is capable of leaping vertically to the remarkable height of 2.3 m. To jump this high, the bush baby accelerates over a distance of 0.14m while extending the legs. The acceleration during the jump is approximately constant. What is the ...
*October 10, 2014*

**physics**

Heather and Jerry are standing on a bridge 53m above a river. Heather throws a rock straight down with a speed of 12m/s . Jerry, at exactly the same instant of time, throws a rock straight up with the same speed. Ignore air resistance. How much time elapses between the first ...
*October 9, 2014*

**chemistry**

A solution of silver perchlorate (AgClO4) is made by dissolving 40.4 g of pure silver perchlorate and diluting it to exactly 140 ml. What is the solutions molarity? Can you just go through the steps of what I need to do? I'm so confused. Thanks
*October 8, 2014*

**Advanced Math**

I got they curl up in... I cant figure out the last word but the letters are D, E, and Y
*September 14, 2014*

**math**

Tina and Jim live 5 miles apart from each other. Tina ran from her house to Jim's house at a rate of 10 miles per hour. Jim ran from his house to Tina's house at a rate of 8 miles per hour. How far had Jim run by the time he crossed paths with Tina?
*September 9, 2014*

**math**

At a construction site, 20,000 pounds of gravel are needed to create a driveway with an area of 400 ft2. What area of driveway can be added with another 125 pounds of gravel? 25.5 ft2 312 ft2 160 ft2 2.5 ft2 5 ft2
*September 5, 2014*

**biology**

how does sugar affect anthocynins?
*September 5, 2014*

**biology**

how does light affect anthocyanins?
*September 5, 2014*

**algebra**

If 50 tickets to the concert cost a company $1,649.50, what do 4 tickets cost? A. $164.95 B. $32.99 C. $65.98 D. $98.97 E. $131.96
*September 5, 2014*

**Math**

In this case. Would you use sinA/a=sinB/b=sinC/c
*August 27, 2014*

**Math**

How do you know that?
*August 27, 2014*

**Math**

The three angles of a triangle are 105°,25°,50° . In what ratios are the sides?
*August 27, 2014*

**Math**

What do you do next?
*August 27, 2014*

**Math**

The three angles of a triangle are 105°,25°,50° . In what ratios are the sides?
*August 27, 2014*

**math**

A $15,000 debt is to be amortized in 12 equal semiannual payments at an annual interest rate of 11% on the unpaid balance. Construct an amortization table to determine the unpaid balance after two payments have been made.
*June 26, 2014*

**Algebra 1**

y=-x+10
*June 1, 2014*

**health**

With bone-strengthening activities, your feet, legs, or arms support your body's weight, and your muscles push against your bones. This helps make your bones strong. Running, walking, jumping rope, and lifting weights are examples of bone-strengthening activities.
*May 21, 2014*

**Science (A&P)**

Trace the path of food from the mouth to the large intestine and what occurs at each structure. Anything would be helpful because I am having trouble finding the answer.
*May 21, 2014*

**Science**

When a cell is infected with a virus, what is produced for future protection? i thought it was good bacteria but i don't think a cell can do that. So confused.
*May 21, 2014*

**Algebra 2**

That is 300 degrees so (1/2,square root 3/2). The cosine is (1/2). For exact value, (5 pie/3) times (180/pie). Cross multiply. Hope that helps!
*May 21, 2014*

**Algebra **

How do you find the excluded value if there is another variable or number in the denominator? Such as the equation 12(a) over a squared minus 3(a) minus 10?
*May 19, 2014*

**chemisty**

how many joules of energy are needed to change 275 g of water from 15 degrees C to steam at 100 degrees C?
*May 13, 2014*

**Social Studies! CHECK!**

What do you think the answers are?
*May 6, 2014*

**chem**

How many grams of NH3 are present in 725 mL of gas at STP?
*April 29, 2014*

**Chemistry: Check my answers?**

12 : is false everything else looks great
*March 24, 2014*

**Education**

it does not give a exact answer, it's wording is unclear.
*March 12, 2014*

**Education**

well help me out hoe
*March 12, 2014*

**Education**

In a study about kindergarten readiness, which one of the following was true? A. Group participation skills were viewed as insignificant in comparison to academic skills. B. The ability to write one's name was followed by self-control. C. The majority of teachers placed ...
*March 12, 2014*

**education**

Teachers usually ask more of this type of question even if it is NOT recommended: convergent. B. divergent. C. open-ended. D. recall.
*March 12, 2014*

**ece**

I think C
*March 12, 2014*

**ECE**

Would it be D?
*March 12, 2014*

**Early Childhood**

Agreed
*March 12, 2014*

**Chemistry**

2 NO(g) + O2 (g) <==> 2 NO2 (g) Given that Kp=7.96×1012 for the reaction above and the following starting conditions: Initial Concentrations p(NO)=0.775 atm p(NO2)=0.000 atm p(O2)=0.789 atm Determine the equilibrium concentration of NO2.
*March 7, 2014*

**math algebra**

I have a really hard problem and I need help answering it. Two trains are traveling opposite directions. One train is traveling at the speed of 90 mph. The second train is traveling at a speed of 95 mph. The two trains travel for 3 hours. How far apart are the two trains?
*February 27, 2014*

**math algebra**

The answer is 2.4 hours
*February 27, 2014*

**math **

coach kent brings 3 qt of sport drink to soccer practice each player gets the same amount of drink how many oz of the drink does each player get?
*February 12, 2014*

**Physics**

Calculate the percentage of Earth’s gravitational force on the ISS astronauts while orbiting at an altitude of 248 miles above Earth’s surface. To do this, compare the gravitational force on an orbiting astronaut to the force on the astronaut here at Earth’s ...
*January 28, 2014*

**English 12**

Explain how a word can be a morphemic noun and a syntactic adverb in the same sentence.
*January 17, 2014*

**physics**

A 17 kg child descends a slide 3.5 m high and reaches the bottom with a speed of 4.5 m/s. How much work was done by friction as the child goes down the slide?
*January 15, 2014*

**physics**

A 17 kg child descends a slide 3.5 m high and reaches the bottom with a speed of 4.5 m/s. How much work was done by friction as the child goes down the slide?
*January 15, 2014*

**physics**

A 17 kg child descends a slide 3.5 m high and reaches the bottom with a speed of 4.5 m/s. How much work was done by friction as the child goes down the slide?
*January 15, 2014*

**statistic**

Neither! The response variable used to be called the depended variable. It's also plotted along the y-axis!
*January 14, 2014*

**EARTH SCIENCE**

I have taken the exam on penn foster and 125 gallons is not the right answer!
*January 7, 2014*

**Elementary Math**

All I did was 15.4 x .7 which equals 10.78
*January 2, 2014*

**Early Childhood Education**

lol ,dang she told you!
*December 11, 2013*

**Spanish 4**

help with worksheets
*December 10, 2013*

**math**

What number must be added to make a perfect square trinomial x^2+(8/5)x
*December 8, 2013*

**College Algebra**

Pencils cost 20 cents and pens cost 50 cents. Mabel buys x pencils and y pens, spending $2.00. Write an equation in standard form with integer coefficients that relates x and y.
*November 20, 2013*

**College Algebra**

Write an equation for the amount of money, A, that we would have if we invested $25,000 at 6% per year for 5 years compounded instantaneously.
*November 20, 2013*

**College Algebra**

Write an equation for the amount of money, A, that we would have if we invested $2000 at 8% interest for 10 years compounded semiannually (twice each year)
*November 20, 2013*

**College Algebra**

Solve the System 2x-8y=20 3x-12y=30
*November 20, 2013*

**College Algebra**

A 50 gallon barrel plumb full of water springs a leak in the bottom and leaks at a constant rate of two gallons per minute. Write an equation that relates the amount of water left in the barrel, y in terms of how many minutes have passed since the leak began, x.
*November 20, 2013*

**College Algebra**

A company that bought a machine for $30,000 wants to depreciate its entire value equally over the next ten years. Write an equation that represents the machine's value, v, in terms of the number of years that have passed since the machines purchase, t.
*November 20, 2013*

**College Algebra**

Change the equation 5x+3y=60 to slope-intercept form.
*November 20, 2013*

**College Algebra**

Change the equation to slope-intercept form.
*November 20, 2013*

**College Algebra**

Mints cost 5 cents each and gumballs cost 3 cents each. Kathleen spent 60 cents buying x mints and y gumballs. Write an equation in stand form that represents all the different combinations of mints and gumballs that Kathleen might have purchased.
*November 20, 2013*

**algebra**

what is the cube root of -125x^6
*November 10, 2013*

**world history**

what did samuel kemper and the republican army accomplish?
*November 1, 2013*

**Chem 1**

Suppose 1.624g of salt FeSO4 is placed in a 250mL flask to which 50mL of water and 10 mL of 3M H2SO4 are added. How many mL of .1062 M KMnO4 solution are required to reach the endpoint?
*October 21, 2013*

**Chem 1**

What about the mL of water and H2SO4
*October 21, 2013*

**Chem 1**

Suppose 1.624g of salt FeSO4 is placed in a 250mL flask to which 50mL of water and 10 mL of 3M H2SO4 are added. How many mL of .1062 M KMnO4 solution are required to reach the endpoint?
*October 21, 2013*

**Science**

Oooh this helped me on mine.
*October 8, 2013*

**Math**

if kelly gave 1/3 of a pizza to holly and 1/5 to diana, how much did she have left?
*September 30, 2013*

**math**

write a numerical expression to represent the phrase Half a number increased by 34
*September 19, 2013*

**math**

a carload of fraternity brothers leave their house for a long weekend trip. three hours later a second carload of brothers leaves the same house and travels the same path. if the second care drives and average of 15 mph faster than the first, what is the average speed of eavh ...
*September 9, 2013*

**math**

jim has a box in the shape of a rectangular prism. The area of the base of the box is 48 square inches. The volume of the box is 144 cubic inches. Let h = the height of Jim's box. Write and solve an equation you can use to find the height of Jim's box.
*August 29, 2013*

**algebra**

A person invested 20,000$ in stocks and bonds. Her investment in bonds is 5,000$ more than half her investment in stocks. How much did she invest in stocks? how much did she invest in bonds?
*August 29, 2013*

**Early childhood**

Thank you!
*August 25, 2013*

**English**

What is the physical journey like in the novel "Murder on the Orient Express" and how does it add to the meaning?
*August 23, 2013*

**trig**

Find all solutions of the equation. Leave answers in trigonometric form. x^5-1024=0 I got 4(cos tehta + i sin tehta), tehta = 0, 2pi/5, 4pi/5, 6pi/5, 8pi/5 is this right
*July 2, 2013*

**hazard bctcs**

one aspect of the beauty of scenic landscape is its variability. The elevations (feet above sea level) of 12 randomly selected towns in the Finger Lakes Regions of Upstate New York are recorded here. 1117, 1360, 1009, 766, 1333, 1306, 577, 1144, 874, 658, 1306, 712. Find the ...
*May 22, 2013*

**hazard bctcs**

one aspect of the beauty of scenic landscape is its variability. The elevations (feet above sea level) of 12 randomly selected towns in the Finger Lakes Regions of Upstate New York are recorded here. 1117, 1360, 1009, 766, 1333, 1306, 577, 1144, 874, 658, 1306, 712. Find the ...
*May 22, 2013*