Wednesday

February 22, 2017
Total # Posts: 1,205

**AP Statistics**

Viruses are infectious agents that often cause diseases in plants. Different viruses have different potency levels, and this fact can be used to detect whether a new virus is infecting plants in the field. In a potency comparison experiment, two viruses were placed on a ...

*April 24, 2011*

**Physics**

Still stuck...see post at 3:34pm. I don't think I'm understanding the instructions regarding what #'s to use for sin and cos.

*April 23, 2011*

**Physics**

The answer is supposed to be 16.5N. I can't get it. Is angle A, 100deg? I took 0.80/2.5 = .32 and then cos (.32) = .9999deg. And then in the final equation, for sin A I got sin (100deg) = 98.4. This doesn't seem right.

*April 23, 2011*

**Physics**

Q #2: (only other one I'm stuck on...) A 10-kg ladder 2.5m long rests agaist a frictionless wall with its base on the floor 80cm from the wall. How much force does the top of the ladder exert on the wall? I've found answers to similar questions on this site, but not ...

*April 23, 2011*

**Physics**

A 30-lb weight is attached to one end of a 6-ft uniform beam whose own weight is 20-lb. Where is the balance point? Thanks in advance.

*April 23, 2011*

**Physics**

A 100-kg box is suspended from two ropes; the left one makes an angle of 20degrees with the vertical, and the other makes an angle of 40degrees. What is the tension in each rope. I think I've got the basics: I have Fx=T1(x) + T2(x)= 0 to calc the first tension, and Fy= T1(...

*April 22, 2011*

**Physics**

A 30-lb weight is attached to one end of a 6-ft uniform beam whose own weight is 20-lb. Where is the balance point of the system? I know the answer is "1.2 ft from the 30-lb weight" but I can't figure out how to get there. Please help. Thanks...

*April 22, 2011*

**Algebra 1**

Thank you very much.(:

*April 21, 2011*

**Algebra 1**

Can someone please help me?!?! This is solving for x & y. And it so complicated to me.! And worst of all I have a test on it tomorrow.! D:<

*April 21, 2011*

**Algebra 1**

You drive a car that runs on ethanol and gas. You have a 20-gallon tank to fill and you can buy fuel that it is either 25 percent ethanol or 85 percent ethanol. How much of each type of fuel should you buy to fill your tank so that it is 50 percent ethanol?

*April 21, 2011*

**Music**

Von Bingen's Play of Virtues is set to which of the following types of music?

*April 20, 2011*

**music**

In plainchant, a sentence of text almost always ends with

*April 20, 2011*

**music**

A)was easily understood by the listener B)conveyed happiness C)want't monotonous D)had enjoyably rhythm

*April 20, 2011*

**music**

Landini's tendency to intersperse occasional melismas in text that was generally syllabic in nature helped to ensure that the music

*April 20, 2011*

**Science**

calculate the mass of sodium nitrate in grams in a 150 ml solution of a 5.00 M solution of sodium nitrate

*April 19, 2011*

**math/115**

evaluate -|-618| please help me, I just don't get it

*April 14, 2011*

**Chemistry**

I had to miss a lab yesterday. Do you know of a website where I can virtually prepare methyl salicylate (oil of wintergreen)? The experiment involves salicylic acid + methyl alcohol + concentrated sulfuric acid + heat....then when two layers form collect the top layer and ...

*April 13, 2011*

**physics**

"The mass density of brain matter is 1.040 g/cm^3, and of that, the mass fraction which is hydrogen, is 0.107. Find the number of hydrogen protons in a volume of 1cm^3 of brain tissue"

*April 11, 2011*

**physics**

We couldn't find "The mass density of brain matter is 1.040 g/cm^3, and of that, the mass fraction which is hydrogen, is 0.107. Find the number of hydrogen protons in a volume of 1cm^3 of brain tissue"

*April 11, 2011*

**chemistry**

how do you make 1.00g of NaC2H3O2 using: 0.400 M Na2Co3 0.300 M Pb(C2H3O2)2 NaOH solution with unknown molarity 0.500 M HC2H3O2 You don't have to use all of them

*April 6, 2011*

**freedom similes and metaphors?**

As free as the mind with imagination.

*April 3, 2011*

**science**

How many grams of oxalic acid dihydrate (H2C2O4) are needed to react with 38.56 ml of 0.2500 sodium hydorxide

*March 31, 2011*

**Chem**

Given this reaction: Pb(NO3)2 + 2 KCl --> PbCl2 + 2KNO a. How many milliliters of 2.00 M Pb(NO3)2 will react with 50.0 mL of 1.50 M KCl

*March 31, 2011*

**MATH**

If 20% of population have blue eyes, and 5 people are selected at random, what is the probability that at least 4 of them have blue eyes? HOW DO I FIND THE SOLUTION TO THIS PROBLEM?

*March 25, 2011*

**trig**

Evaluate each value as a trigonometric function of an angle in Quadrant 1. #1 cos (27pi/8)

*March 22, 2011*

**Dividing Decimals**

I don't get It neuther

*March 14, 2011*

**Dividing Decimals**

1.55

*March 14, 2011*

**PHI103:Informal Logic**

Grading Summary These are the automatically computed results of your exam. Grades for essay questions, and comments from your instructor, are in the "Details" section below. Date Taken: 8/16/2012 Time Spent: 47 min , 28 secs Points Received: 25 / 25 (100%) Question ...

*March 7, 2011*

**Biology**

The human retina has an area of about 1000 mm^2. If we have a total of 125 million rods and 6.5 million cones in each eye, show that we have about 131,500 sensory cells per square millimeter in the retina.

*March 3, 2011*

**Math**

Jim bought a pair of shoes for $50 and laces for $1. If the sales tax is 7%, how much tax must he pay?

*March 2, 2011*

**physics**

Lance threw a ball straight up into the air. The ball's gravitational potential energy at its peak height was 0.4 joules, and its speed when it hit the ground was 4 meters per second. What was the mass of the ball?

*March 2, 2011*

**Microbilogy**

Albert Kluyver "From elephant to...bacteria-it is all the same!" What did he mean?

*March 1, 2011*

**Statistics**

The probability that a football game will go into overtime is 20%. What is the probability that two of three football games will go to into overtime? A) 0.384 B) 0.2 C) 0.04 D) 0.096

*March 1, 2011*

**english**

lol, Writeacher-I missed that one myself, and usually don't! My mom taught me more than the teachers in school did about English and spelling, so I feel like a dolt for missing it!!

*February 24, 2011*

**english**

I'm no teacher or tutor, but wouldn't the word "so" work to join them?

*February 24, 2011*

**Microbiology**

People with Rhinovirus infections of the nose and throat have an 80-fold increase in kinins and no increase in histamine. What do you expect for rhinoviral symptoms? What disease is caused by rhinoviruses?

*February 24, 2011*

**Microbiology**

People with Rhinovirus infections of the nose and throat have an 80-fold increase in kinins and no increase in histamine. What do you expect for rhinoviral symptoms? What disease is caused by rhinoviruses?

*February 24, 2011*

**Chemistry**

Write an equation for the reaction that takes place when LiOH is added to water.

*February 23, 2011*

**Microbiology**

Alright then, thank you-I'll try looking for what you said and go from there. I don't need a great big answer for this-just a sentence or two.

*February 23, 2011*

**Microbiology**

Ugh, believe it or not, this is a "glossing over" of the subject-the book I have doesn't even go chapter-by chapter. It starts with chapter 1, and skips to 5! After that, it goes from 7 to 10. The whole book might be 20 chapters, but not chronological-they skip. ...

*February 23, 2011*

**Microbiology**

Thanks! would that be the anser though, to that question as well?

*February 23, 2011*

**Microbiology**

I don't know what those are-I'm just struggling to get through this little bit of Science for a college course.

*February 23, 2011*

**Microbiology**

Gram stains and acid-fast stains of pus showed gram-positive acid-fast rods. What are the possible organisms?

*February 23, 2011*

**College Algebra**

1=(X-100)/((X+100)/2)) / ((2-1)/((2+3)/2) Solve for X I know X =200, but don't understand how to reach that anwser.

*February 21, 2011*

**COM/155**

Last night I took my daughters to go see Justin Bieber, Never Say Never movie. Its about a 16-year-old pop star’s FIRST(adj) concert film. It also EXPLORES(adj) Justin’s personal journey to a sold out concert in Madison Square Garden last year. It details how Justin...

*February 20, 2011*

**COM/155**

Use at least five adverbs and five adjectives to write a brief review of a movie, sporting event, musical performance, or television show. I wrote my movie review but im really confused on which ones are adjectives and which ones are adverbs. could you please help me? Last ...

*February 20, 2011*

**english**

What can hold six gallons of water, be found in a survival kit, and be the size of my foot? (I wear a size 6 to 7.5 in shoes)

*February 17, 2011*

**Survey of the Sciences**

a typical cell in the body makes about 10 million molecules of atp per second. show that the cell breaks down about 263,258 molecules of glucose per second.

*February 15, 2011*

**math**

The house numbers on Carr Memorial Avenue follow a pattern.The first four houses on the left side of the street are numbered 8,14,20,and 26.How many more houses are on the left side of the street with numbers less than 50

*February 15, 2011*

**calculus**

no you can't find the y calues by using the equation to the tangent line because of the missing values for a, b and c. the first derivative is 2Ax+B so obviously that doesnt work out. but when we set it equal to zero, which we are supposed to do when we know all the values...

*February 10, 2011*

**calculus**

Let f(x)= Ax^2 + Bx + C. If f(x) passes through the point (-1,1) and has a relative minimum at (1,-13), find A, B, and C.

*February 10, 2011*

**Survey of the sciences**

When the hydronium ion comcentration of a solution equals 1 mole per liter, what is the pH of the solution? Is the solution acidic or basic?

*February 9, 2011*

**Survey of the sciences**

Show that one mole of sugar equals 342 grams.

*February 9, 2011*

**Physics- Vectors**

A bartender slides a beer mug at 1.4 m/s towards a customer at the end of a frictionless bar that is 1.8 m tall. The customer makes a grab for the mug and misses, and the mug sails off the end of the bar. (a) How far away from the end of the bar does the mug hit the floor? (b...

*February 5, 2011*

**MATH**

You have $110 IN YOUR lunch account and plan to spend $2.75 each school day. a) Write and graph a linear equation that represents the balance in your lunch account (i just need help making an equation for this problem) b) How many school days will it take to spend all of the ...

*February 5, 2011*

**economics**

the smith company made and sold 10,000 metal tables last year. when output was between 5,000 and 10,000 tables, its average variable cost was $24. in this output range, each table contributed 60 percent of its revenue to fixed costs and profit. what was the price per table?

*February 5, 2011*

**physics**

Carrying out the following mathematical manipulations: (5.78 +/- 0.04)^2 How do you set this problem up?

*February 4, 2011*

**Survey of the Sciences**

Thank you Damon! now, here's the last part of that along with the first again.... Calculate the height from which a block of ice at zero degrees celcius nust be dropped for it to completely melt upon impact. Assume that there is no air resistance and that all the energy ...

*February 2, 2011*

**Survey of the Sciences**

Calculate the height from which a block of ice at zero degrees celcius nust be dropped for it to completely melt upon impact. Assume that there is no air resistance and that all the energy goes into melting the ice.

*February 2, 2011*

**Criminal Justice**

I need to write a paper on the differences of police officers with a GEd and those with further education. Also do either have more civil rights complaints

*January 31, 2011*

**Physics**

Both block A and B mass 3kg and are initially 2m above the ground. They slide down a smooth ramp and then across a rough surface with a speed of 4m/s. How much energy did the block lose due to the friction along the rough surface? AND is transformed into what form of energy?

*January 30, 2011*

**finance**

Pick a company that pays dividends, then calculate the expected growth rate of your company using the CAPM. Once this task is complete, calculate the expected growth rate using the Constant Growth (or Gordon Growth) Model.

*January 23, 2011*

**Physics**

The radius of a circle is measured to be 12.8 ± 0.2 cm. I need to find the Area and the Circumference of the circle? But how to I account for the uncertainties in each value?

*January 21, 2011*

**Calc**

A mass is oscillating on the end of a spring. The distance, y, of the mass from its equilibrium point is given by the formula 2zcos(14πwt) where y is in centimeters, t is time in seconds, w and t and are positive constants. What is the furthest distance (cm) of the mass ...

*January 17, 2011*

**Calc**

A mass is oscillating on the end of a spring. The distance, y, of the mass from its equilibrium point is given by the formula 2zcos(14πwt) where y is in centimeters, t is time in seconds, w and t and are positive constants. What is the furthest distance (cm) of the mass ...

*January 17, 2011*

**Calc**

Consider a circle of radius 2 and a point P rotating around it. The angle θ, in radians, is given as a function of time t. (a) What is the value of θ when t=1.5? (b) Find the coordinates of P when t=1.5

*January 15, 2011*

**Chemistry**

370 mL

*January 9, 2011*

**7th grade social studies**

what was the importnat beaureacrats of the tang and song dynasties?

*January 3, 2011*

**statistics**

In baseball, is there a linear correlation between batting average and home run percentage? Let x represent the batting average of a professional baseball player. Let y represent the home run percentage (number of home runs per 100 times at bat). Suppose a random sample of ...

*December 19, 2010*

**College Math**

It is homework, I am doing the problems right now in Week 5 Assignment 2 of College Math at the AIPOD.

*December 12, 2010*

**Chemistry**

If 30.0 g of H2 were used, how many grams of NH3 would be made?

*December 11, 2010*

**Algebra**

correct!

*December 11, 2010*

**Chemistry. Help please**

Calculate the pH of a buffer solution made by mixing 174 mL of a 1.68M trimethylamine (CH3)3N solution with 250 mL of a 1.08M trimethylammonia chloride, (CH3)3NHCl solution.

*December 9, 2010*

**math**

break apart these numbers 40x16

*December 9, 2010*

**Chemistry. please help**

A 0.12 g sample of unknown was placed in a flask and dissolved in 125 mL of deionized water. A solution of HCl (0.10 M) was used to titrate the sample, and 18 mL was required to reach the endpoint. What is the formula weight of the unknown?

*December 8, 2010*

**chemistry**

Write the 12 mole ratios that can be derived from the equation for the combustion of isopropyl alcohol?

*December 8, 2010*

**geomety**

solve for x 5 + x 10 ----- = ---- x 8

*December 8, 2010*

**geometyr**

determine the perimeter of triangle KLM, if triangle KLM-triangle FGH, FG=30, GH=38, FH=38 and KL=24

*December 8, 2010*

**Europe**

What role did the geography of europe play in the development of and ways of life in these towns?

*December 6, 2010*

**Chem**

When dissolved in an aqueous solution, which of the following salts will yield a neutral solution? Choose one answer. a. KCN b. NaHSO4 c. Na3PO4 d. AlBr3 e. MgBr2

*December 3, 2010*

**Chemistry**

One of the most obvious ways to tell that a chemical reaction has occurred, as we all know, is that the color of 'stuff' changes. Ligand exchange reactions are one class of reactions where this is very evident, as exemplified by the color change of a green Ni(H2O)62+ ...

*December 1, 2010*

**Chemistry**

I posted a question at 5:43pm yesterday...can anyone please help with at least some of it? Thank you so much.

*November 26, 2010*

**Chemistry**

I really appreciate your help.

*November 25, 2010*

**Chemistry**

I have spent all afternoon (on Thanksgiving, no less) trying to figure out these post-lab questions. We had to produce a precipitate of a reaction of: 1) 1 ml 1M Na2SO4 + 9mL 1M CaCl2 Our result was .569g 2) 5 ml 1M Na2SO4 + 5 ml 1M CaCl2 Our result was .01g 3) 9 ml 1M Na2SO4...

*November 25, 2010*

**Physics**

When tossed upward and hit horizontally by a batter, a 0.23 kg softball receives an impulse of 2.0 N·s. With what horizontal speed does the ball move away from the bat?

*November 24, 2010*

**physics**

A horizontal force of 25 newtons pushes a box a distance of 30 meters across the floor. How much work is done by the force?

*November 23, 2010*

**Astronomy**

Which one supports the solar nebula theory of the origin of the solar system? a.Disks are rare around young stars. b.Disks are common around young stars. c.The sun is the least massive object in the solar system. d.Planets are round.

*November 23, 2010*

**science**

thank you! I just thought that just because jupiter is a gaseous planet that it would have a lesser mass.

*November 23, 2010*

**math**

Sevnety-eight players entered a single elimination tennis tournament.How many matches were played to determine the overall champ? please help me...and if u get the answer can you explain how you got it with a rule or a pattern

*November 18, 2010*

**language**

replacing with possessove nouns ex the sister Miguel woke up him. Miguel's sister woke up him

*November 16, 2010*

**11th grade**

At a glassware factory, molten cobalt glass is poured into molds to make paperweights. Each mold is a rectanglar prism whose height is 3 inches greater than the length of each side of the square base. A machine pours 20 cubic inches of liquid glass into each mold. What are the...

*November 15, 2010*

**geometyr**

given triangle QRS=triangle TUV, QR=2x=7, RS=13,and QS=3x+2 and TV=7x-6 find the value of x

*November 15, 2010*

**english**

thanks guys, but arethere any objects you think i can bring to school?

*November 13, 2010*

**english**

are there any objects that represent perseverence? and why? i need this for an english projcet

*November 13, 2010*

**college microeconomics**

Suppose that two players are playing the following game. Player 1 can choose either top or bottom, and Player 2 can choose either left of right. The payoffs are given in the following table Player 2 Left Right top 9,4 2,3 Player 1 Bottom 1,0 3,1 where the number on the left is...

*November 7, 2010*

**Algebra**

do the FOIL method f for first o for outer i for inner l for last (8y+5z)(8y-5z) 64y^2 + 40yz - 40yz + -25z^2 64y^2 - 25z^2

*November 4, 2010*

**math**

the answer is c

*November 4, 2010*

**Math**

-2 3/4 - 6 5/9=

*November 4, 2010*

**Math**

2 2/3 + -1 1/2=

*November 4, 2010*

**help!!! physics**

you want to nail a 1.6 kg board onto the wall of a barn. to position the board before nailing, you push it against the wall with a horizontal force to keep it from sliding to the ground. (a) if the coefficient of static friction between the board and wall is .79, what is the ...

*November 3, 2010*