Tuesday

January 24, 2017
Total # Posts: 1,717

**statistics**

I got 2 percent for number two. But I can't solve for number one. Is it 60%?

*September 16, 2013*

**statistics**

You and your friend decide to get your cars inspected. You are informed that 70% of cars pass inspection. If the event of your car’s passing is independent of your friend’s car: iii. What is the probability that both of the cars pass inspection (6 points)? a. 60% b. ...

*September 16, 2013*

**Chemistry**

Expected number of moles of copper oxide (using the emprical formula of copper oxide and the starting moles of Cu)

*September 15, 2013*

**Chemistry**

Moles of Cu in the copper sulfate salt: mass is 90. and there are 5g of copper sulfate

*September 15, 2013*

**Chemistry**

Calculate the moles of O in 2.57g of Ba(No3)2 I get 33.2m

*September 12, 2013*

**Chemistry**

On an alien planet, volume is measured in units of smaugs (S) and odahviings (O), where 1 S = 2.25 O. By some weird coincidence, they use the exact same metric system that we use. Knowing this, how much is 500.0 O in units of kS

*September 12, 2013*

**Pre-calc**

Let p(x,y) be a point on the graph of y= X^2-3 A) Express the distance from P to the point (1,2) as a function of x. Simplify completely. B) Use your calculator to determine which value of x-yields the smallest d.

*September 10, 2013*

**Pre-calc**

a rectangular yard is to be enclosed by a new fence on 3 sides and by an existing fence on the fourth side. the amount of new fencing to be used is 160 feet

*September 10, 2013*

**Pre-calc**

a rectangular yard is to be enclosed by a new fence on 3 sides and by an existing fence on the fourth side. the amount of new fencing to be used is 160 feet

*September 10, 2013*

**Pre-calc**

find a possible polynomial equation of degree 4 if the zeroes are -1,2, and 5, the graph touches the x-axis at -1 but does not cross through, and the y intercept is -5

*September 10, 2013*

**Chemistry**

I don't really understand how you got this answer.

*September 7, 2013*

**Chemistry**

Calculate the theoretical mass percent of oxygen in KClO3. here is the my mass percentage of 02 25gKCl03/30.0gKCl03=0.61%02.

*September 7, 2013*

**Math (Pre-calc)**

1) F(x)= (X+2)/(X^2-4x-5) A) Find the domain (-00,-1)u(-1,5)u(5,00) B) find F(-3) I'm not sure how to do it. C) Find F(X+2) I'm not sure either. 2. f(x)= (2x)/(x-4) G(x)= (x)/(X+5) find the domain of each. A)(F+G) (4x^2+5x)(x-4)(X+5) x can't= 4,-5 B) (F*G) (2x^2)/(...

*September 5, 2013*

**Calculus**

The region bounded by y=-x^2+14-45 and y=0 is rotated about the y-axis, find the volume.

*September 5, 2013*

**Chemistry**

They are both 1Mole

*August 26, 2013*

**Chemistry**

How much solid product formed with 30ml of NaOH and 40mL of NiCl2? I'm not really sure how to go about this?

*August 26, 2013*

**Math**

Any help would be appreciated. This is for my study guide in order to do well on my test. Someone please help.

*August 22, 2013*

**Math**

Solve the system of equations 3x-y=11 -5x+y=12 2. Perform the indicated operation and simplify (5/(x-2)+(4(x^2-2x) 3.simpify and write with only positive exponents (7x^3y^-2)/(x^-4y^9)^-3 4. find the solution of the inequality 2x-11 is less than or equal to -4(5x-3) 5. the ...

*August 22, 2013*

**math**

2(x-3/4)+3(x+2/3)+4(x-1/5)=9x+17

*August 19, 2013*

**SAT math**

If the ratio of blue balls to red balls is 2.5 to 4, and there are 25 blue balls, how many red balls are there?

*August 13, 2013*

**English**

Words with the root sid: 1. President 2. Reside 3. Residence 4. inside 5.preside Potation: The act of drinking something *Unfortunately I can't explain your "Insidious" issue

*August 13, 2013*

**Chemistry-Please help!**

In a concentration cell, what would be the potential if we studied two solutions that had the same concentration?

*August 12, 2013*

**Chemistry- Please Help!!**

Acetic acid has a Ka = 1.75 x 10-5 and formic acid has a Ka = 1.8 x 10-4. Which is the stronger acid?

*July 31, 2013*

**Chemistry- Please Help!!**

If a 0.10 M solution of an acid has a pH of 4.5, what would be the predicted pH of a .10 M solution of the conjugate, and why?

*July 31, 2013*

**Chemistry- Please Help!!**

according to lechateliers principle, would increasing the starting concentration of Ca2+ increase or decrease the amount of Ca(IO3)2 that dissolves???

*July 28, 2013*

**Chemistry- Please Help!!**

Predict the proper equilibrium constant expression for the following reaction... Fe(OH)3(s) ----> Fe3+(aq) + 3 OH-(aq) Explain the reasoning behind your answer.

*July 27, 2013*

**Mass Media Public Law**

In the aftermath of the 9/11/2001 terrorist attacks on America, and the resulting War on Terrorism by the United States, what do you think is the reasonable and legal limitations on the First Amendment?

*July 13, 2013*

**Chemsitry**

Calculate the molar mass of an unknown molecular compound mixed with solid camphor C10H16O, heated and then cooled giving the following data. show all steps in calculation. mass of unknown: 0.195 g Tf(camphor)= 179.8 degree C Kf(camphor)=-40.0 degree C/m mass of camphor-25.03g...

*July 10, 2013*

**Chemistry- Please Help!!**

Calculate the molar mass of an unknown molecular compound mixed with solid camphor C10H16O, heated and then cooled giving the following data. show all steps in calculation. mass of unknown: 0.195 g Tf(camphor)= 179.8 degree C Kf(camphor)=-40.0 degree C/m mass of camphor-25.03g...

*July 10, 2013*

**Chemistry- Please Help!**

Calculate the freezing point of an aqueous solution formed by dissolbing 4.22 g of KCl in 25.00 mL of water. Kf for water is (-1.86 degree C/m). Assume density of water is 1.00 g/mL. (Hint: Use the ideal van't Hoff factor, i).

*July 10, 2013*

**Chemistry**

Gasoline is primarily a mixture of hydrocarbons and is sold with an octane rating that is based on a comparison with the combustion properties of isooctane. Gasoline usually contains an isomer of isooctane called tetramethylbutane (C8H18), which has an enthalpy of vaporization...

*July 9, 2013*

**Chemisty- Please help!**

What mass of a 0.66 molality ammonium nitrate (80.04g/mol) solution will contain 0.15 mol of solute?

*July 9, 2013*

**Math for Educators**

24five x 3five ------ 132five 27eight 65eight +43eight ------- 157eight 75eight -37eight ------- 36eight 1213five/3five??? -If someone could please confirm my answers for the others as well as help me with the last division problem thank you! these are all equating in ...

*June 17, 2013*

**Math for Educators**

I am thinking of some #s less than 100. When I divide them by 2 there is a remainder of 1. When I divide them by 3 there is a remainder of 1. When I divide it by 4 there is a remainder of 1. However, when I divide by 5 there is no remainder. what are the #'s? - my answer ...

*June 17, 2013*

**Math For Educators**

A homeowner empties her hot water heater every 36 days and changes the filter in the heat pump every 48 days. She did both on Friday September 17th, 2012. When will she do both on the same day? ( give the day of the week, date, month and year. also the date is made up and not ...

*June 15, 2013*

**math**

Use an elimination strategy to solve this linear system: 10x + 10y = 1030 5x + 5y = 135

*June 11, 2013*

**math**

trixie , we have the same question lol

*June 11, 2013*

**math**

so do i write the exact same thing as you wrote? what does this mean? cashews --- x brazils ---- 120-x

*June 11, 2013*

**math**

can you help me more please

*June 6, 2013*

**math**

15+1/2=0.60(20+x)

*June 6, 2013*

**Chemistry**

How many meters underwater is 3.128 atm?

*June 2, 2013*

**Math**

Thank you! :)

*May 29, 2013*

**Math**

I think it's the second option?

*May 29, 2013*

**Math**

A city council candidate asks his campaign staff to gather some polling data. they survey a sample of voters to determine voters' attitudes. Which survey question does not show bias? Don't you think our candidate is the most qualified? Do you think education or ...

*May 29, 2013*

**Chemistry**

What is HO HO C6 H6 CH2 CH NH2?

*May 28, 2013*

**CHEM**

If a 5.0L volume of O2 (g) is at 1.0 atm, if we hold the temperature and molar amount of O2 constant how many psi of pressure does this amount of O2 exert if the volume it is allowed to take up is decreased to 2.0L?

*May 23, 2013*

**Chem 104**

If a 5.0L volume of O2 (g) is at 1.0 atm, if we hold the temperature and molar amount of O2 constant how many psi of pressure does this amount of O2 exert if the volume it is allowed to take up is decreased to 2.0L?

*May 23, 2013*

**math**

The deepest part of the Pacific Ocean is Marianas Trenchwith a depth of 10,911 meters,The deepest part od the Alantic Ocean is the Puerto Rico Trench with a depth of 8,648 meters Whatn is the difference in elevation of the two trenches?

*May 22, 2013*

**economics**

1) Recent trends toward trade restrictions have been to a) lower only those trade barriers related to technology. b)shield a country's automobile industries. c)increase trade barriers. d) decrease trade barriers

*May 21, 2013*

**Math**

In Example 2, find the percent of the total and the number of degrees in each sector for mountains, theme parks, relatives, and other. Find the median of the data set in Example 3. In which category does it fall? Find the average unemployment rate for Example 4. Determine ...

*May 21, 2013*

**Algebra**

I need help with two math problems. 1. A triangle has vertices (1, 4), (1, 1), and (-3, 1). The triangle is dilated by a scale factor of 2, then translated 5 units up, and then rotated 90 degrees counterclockwise about the origin. What are the vertices of the image of the ...

*May 19, 2013*

**Math**

12x2/3=8 cookies

*May 18, 2013*

**Chemistry**

unbalanced: PbO+NaCl+H2O+CO2 yields Pb2Cl2CO3+NaOH

*May 18, 2013*

**Chemistry**

How many grams of phosgenite can be obtained from 10.0 g of PbO and 10.0 g of NaCl in the presence of excess water and carbon dioxide

*May 18, 2013*

**Chemistry**

a .6800g sample of carboxylic acid is burned in oxygen, producing 1.212 g of CO2 and .4991 g of H2O. determine the empirical formula of the carboxylic acid

*May 18, 2013*

**Chemistry**

the reaction of 6.62g of carbon with excess oxygen yields 13.40g of CO2. what is the percent yield of this reaction

*May 18, 2013*

**English**

Do you think you could help me with 3 more?

*May 16, 2013*

**English**

Is it the first option?

*May 16, 2013*

**English**

For the first one I think it is the second option. And for the second, I think it is the third option. What you think? :D

*May 16, 2013*

**English**

Choose the correct form for each phrase. 1. the budget for this month this months budget this month's budget this months' budget this months's budget 2. the schedule of the doctor the doctor's schedule the doctors schedule the doctors' schedule the doctors...

*May 16, 2013*

**Psychology**

Personality disorders are thought to originate during childhood but many health professionals are reluctant to diagnose children. Why is this? I need to know the positives and negatives of early diagnosis of personality disorders in children. Can someone please help me out? ...

*May 7, 2013*

**Physics--please help!!**

A student in a parked car honks the horn, which has a `proper' frequency of 320 Hz. An observer in an approaching vehicle measures the frequency of the sound to be 355 Hz. Calculate the speed of the approaching vehicle. Use 340 m/s as the speed of sound in air.

*May 6, 2013*

**Physics--please help!!**

A hydrogen atom, when vigorously perturbed, can emit light with a frequency of 6.16·1014 Hz. When the same light from hydrogen atoms in a distant galaxy is observed on earth, the frequency is 5.76·1014 Hz. Calculate the speed at which the galaxy is receding from ...

*May 6, 2013*

**math**

A soccer player kicks a ball and gives it an initial upward velocity of 47 feet per second. If everyone waits for the ball to bounce, how long will it be in the air? (Use the vertical motion formula, h= -16tsquared + vt + c, where h is the height of the ball will be at time t...

*April 29, 2013*

**Trig(I think)**

Suppose oil spills from a ruptured tanker and spreads in a circular pattern. If the radius of the oil spill increases at a constant rate of 1m/s, how fast is the area of the spill increasing when the radius is 30m?

*April 29, 2013*

**Science**

The density of ethanol is 0.789 g/cm3 at 20 degrees celsius. What is the mass of 150cm3 of this alcohol?

*April 28, 2013*

**physics for physical science**

2.232667747500

*April 26, 2013*

**algerba 1**

Solve by graphing 1. 2x2-7x+5=0 2. 2x2+x-6=0

*April 25, 2013*

**Algebra 2**

Thank you sooooooo much

*April 23, 2013*

**Algebra 2**

a) The average height of sunflowers in a field is 64 inches with a standard deviation of 3.5 inches. Describe a normal curve for the distribution, including the values on the horizontal axis at one, two, and three standard deviations from the mean. b) If there are 3,000 plants...

*April 23, 2013*

**Algebra 2**

thank you

*April 23, 2013*

**algerba 1**

1. the sum of 3 numbers is 207. the 2nd # is 8 times the first, while the third is 3 less than the first. find the #s. 2. the sumof 3 numbers is 161. the second number is 6 times the first, and the third is 5 more than the second. find the #s. Thanks so much!

*April 20, 2013*

**chemistry**

How many grams of NaCl must be added to 225.0 g of H2O at 45 °C to lower the vapor pressure of water by 2.21 mmHg? The vapor pressure of pure water is 71.93 mmHg at 45 °C.

*April 20, 2013*

**Life Orientation**

describe the lifestyle behaviour of the youth who abuse illegal and legal drugs and discuss how this lifestyle behaviour impacts the teenager.

*April 19, 2013*

**Life Orientation**

describe the lifestyle behaviour of the youth who abuse illegal and legal drugs and discuss how this lifestyle behaviour impacts the teenager.

*April 19, 2013*

**health**

The ________ muscle mass belongs to the posterior group

*April 18, 2013*

**Help math!!**

15 students took a science test. the average score was 88.0. later in the day a sixteenth student took the same test and scored a 92. the teacher recalculated the class average using all 16 of the scares. by how much will the class average have increased? show your work.

*April 10, 2013*

**chemistry**

in your equilibrium constant expression do not include water because it is a liquid

*April 4, 2013*

**chemistry**

assume all of the ionized aspirin remains in the buffer solution and all of the un-ionized aspirin goes into to the ethyl acetate, what is the molarity of the aspirin in the ethyl acetate at pH 2 and pH 8? what equation would ou use for this?

*April 3, 2013*

**Alg 1**

I don't know

*April 2, 2013*

**Math**

if kelly gave 1/3 of a pizza to holly and 1/5 to diane how much did she have left

*April 2, 2013*

**calculus**

Find an equation of the tangent line to the curve at the given point. y^2=x^3 (2-x) (1,1)

*March 25, 2013*

**Physics**

A man seeking to set a world record wants to tow a 122000-kg airplane along a runway by pulling horizontally on a cable attached to the airplane. The mass of the man is 95 kg, and the coefficient of static friction between his shoes and the runway is 0.74. What is the greatest...

*March 20, 2013*

**Physics**

A rescue helicopter is lifting a man (weight = 797 N) from a capsized boat by means of a cable and harness. (a) What is the tension in the cable when the man is given an initial upward acceleration of 0.711 m/s2? (b) What is the tension during the remainder of the rescue when ...

*March 20, 2013*

**Physics**

A stuntman is being pulled along a rough road at a constant velocity by a cable attached to a moving truck. The cable is parallel to the ground. The mass of the stuntman is 110 kg, and the coefficient of kinetic friction between the road and him is 0.825. Find the tension in ...

*March 20, 2013*

**Chemistry**

I figured it out. Nevermind.

*March 17, 2013*

**Chemistry**

For the reaction: 2HCl + Na2CO3→ 2NaCl + H2O + CO2 how much CO2 is produced at STP if 18.5 L of 1.15 M Na2CO3is used? The molar mass of Na2CO3is 106.01 g/mol. I know I have to use stoichiometry and possibly PV=nRT but I don't know what to use first. Do I start with ...

*March 17, 2013*

**ethical/unethical**

unethical because one's body is used for experimentation oppose to being used for medical reason- does not value the person as in human being that once lived

*March 12, 2013*

**ethical/unethical**

Is it ethical/unethical to use human cadavers to test out weapons and used them as crash test dummies?

*March 12, 2013*

**stats**

yes I used it against the alpha level .05 of the z score +/- 1.96 so I reject because it is less than stating that those who consumed salty foods didn't have an significant impact on whether the intake of salt affects weight

*March 12, 2013*

**stats**

So I have the mean as 162.5 and standard deviation 18.86 standard error =s/square root n =18.86/12= 5.44 t=m-mean/standard error = 150-162.5/5.44= -2.29 So we fail to reject Ho

*March 12, 2013*

**stats**

So I will have to find the mean and standard deviation of the sample. Then how will I set up the hypothesis to begin running the test

*March 12, 2013*

**stats**

Here's the rest of the data 155 160 150 145 200 155 190 140 170 175 142 168

*March 12, 2013*

**stats**

Which test should be used one samples t test, independent samples t test or dependent samples t test You may have heard that eating salt can influence people’s weight. Assume that the normal weight of 20-year-old females is 150 pounds. You obtain a sample of 20-year-old ...

*March 12, 2013*

**stats**

Which test should be used one samples t test, independent samples t test or dependent samples t test You may have heard that eating salt can influence people’s weight. Assume that the normal weight of 20-year-old females is 150 pounds. You obtain a sample of 20-year-old ...

*March 12, 2013*

**science**

for scientific research

*March 6, 2013*

**science**

is the use of cadavers a positive thing for society

*March 6, 2013*

**math**

A motorcycle leaves colorado springs, colorado, traveling north on I25 at an average speed of 47 mph. one hour later, a car leaves colorado springs, traveling south on I-25 at an average speed of 54 mph. How long after the motorcycle leaves will it take until they are 52 miles...

*March 5, 2013*

**stats**

so I will found my mean for this set by adding up all the data points and divide by 5

*March 5, 2013*

**stats**

which test to use One-sample or independent samples t-test? A researcher tests five individuals who have seen paid political ads about a particular issue. These individuals take a multiple-choice test about the issue in which people in general (who know nothing about the issue...

*March 5, 2013*