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### Dilution Problem?

Hi, I have been trying to figure out this problem for a while now and I can't seem to go anywhere.

1. A bacterial culture with 300 cells/ml is diluted so that it has 3 cells/ml. What is the dilution factor?

Any help is appreciated!

1 AnswerChemistry6 years ago### Returning my Glasses?

Hello. About 1 week ago I went to my optometrist for my yearly check. I got my glasses today, and something just felt wrong. After some time being there, I began to feel really dizzy. I thought it would go away by now (about 6 hrs after I got them) but I feel sick to my stomach still. Would they accept a refund, most likely? In addition to this, (I don't know why I wasn't more careful when picking out my frames, my fault) I changed my mind about the frame. So, most likely, would they give me the same pair of glasses, or may I pick some with a different frame?

Thanks!

3 AnswersOptical6 years ago### Chem PH and POH Question?

Hello. So I have a question about this Chemistry question. I feel like I should know how to do it, but I I'm having the worst time with it.

What is [H+] when [OH-] = 0.014M?

The answer is 7.14 x 10^-13, but I have no idea how they got that. Any help would be greatly appreciated!

1 AnswerChemistry6 years ago### Bottom-left side of mouth hurts after wisdom teeth extraction?

I had my 4 wisdom teeth extracted about 4 days ago, and I have been following the instructions: eating soft foods, rinsing with warm salt water, taking painkillers, etc.

But my bottom-left side of my mouth still hurts, should I be worried? The right side of my mouth is fine. But my left side feels swollen, i can't open my jaw enough, and the pain seems to radiate to my ear.

2 AnswersDental7 years ago### Clarification on this question?

I am so confused on what this is asking. Can anyone break this prompt down so I can determine how I can go about writing it? Any help is greatly appreciated!

We have talked at length about the rage of Juno in the Aeneid. Ovid similarly bases his collection of “disastrous love affairs” in the Metamorphoses on the rage of love and desire. One could thus argue convincingly that the most influential Roman poets viewed gods and goddesses in a more pessimistic manner than their Greek counterparts. Citing one example from each writer (Virgil and Ovid), discuss what you find to be a disconcerting moment of divine irrationality

1 AnswerHigher Education (University +)7 years ago### Quick Chemistry Question?

I am not sure if I am doing this right, so I will like to check.

2.007g of I2 are reacted with 1.998g of Zn to form ZnI2. How much zinc iodide forms? (In grams)

Thanks!!

2 AnswersHomework Help8 years ago### A Chemistry question that I'm stumped on?

I usually get chemistry, but this question confuses me really bad. I'm not sure if I have a brain fart or what, but it would be awesome if I get step by step solutions to see what's going on.

A 9.357-g sample of a solid was placed in a 25.00mL flask. The remaining volume was filled with water, in which the solid is insoluble. The solid and the water together weigh 27.335 g. The density of the benzene is 0.997 g/mL. What is the density of the solid?

Thanks!!

1 AnswerChemistry8 years ago### Food politics and Social Classes?

Hello. For my college English class, we have to do a 7-page research paper of anything related to food politics, whether it be organic vs. inorganic, obesity, diseases, etc.

It has to be a topic that some people disagree about. However, I do not want to write this research paper on the common things, such as organic vs. inorganic.

I want to write something that has to do something between social class and food politics, but i have no idea what the question will be. Any ideas will be greatly appreciated!

2 AnswersHigher Education (University +)8 years ago### When will Kohls call me for an interview?

I went to the store and fill the entire application last Thursday October 27 and i am curious about when they will call me. How long does it usually take?

Thanks!

1 AnswerOther - Careers & Employment9 years ago### Would like to get clarified one problem and...?

I need help on the other one. This is Calculus, btw.

17) lim x-->0 [1/(x+1)]-1/x. I got the answer to be -1. i don't know, though

This is what did:

i multiplied each side by the denominator so i can get a common denominator on both sides. I ended up with this:

--1/1((x+1) - 1(x+1)/(x+1) all divided by x

I crossed out the ones on the first part and i distributed the negative sign to get:

-- -x-1/(x+1)*1/(x+1) all divided by x

Then, magically i got rid of the "all divided by x" part and distributed the numerator, and i do not know what i did to the denominator, and i got:

--- -x-1/(x+1) to get -1.

Some of the steps i did i don't even know if they are correct.

And this one i have no clue on:

lim Δx-->0 sin[(pi/6)+Δx] - (1/2) / Δx

Thanks for the help!!!

1 AnswerMathematics9 years ago### Is this the correct answer?

I don't know if this is how you do this question.

1. Simplify 0=x^2+3x+5.

-I did the quadratic formula, and got x=-3 +or- sqrt( 3^2-4(1)(5)/ 2*1

-I simplified it, and got x=-3 +or - sqrt( -11)/ 2

( i guessed on the following part)

- x=-3 +or- i*sqrt(-11) /2

and my final answer was: x=-3/2 - i*sqrt(-11)/2

Any help would be appreciated!

3 AnswersMathematics9 years ago### Need clarification on 2 math questions?

These 2 questions i am so confused on:

1. Simplify 0=x^2+3x+5. I tried to factor them out and i couldn't and did the quadratic formula but i got stuck...

Apparently, i got this one wrong.

2. Evaluate the following expression:

tan(sec^-1(25/7)).

I had no clue; i plugged it in the calculator and got undefined, but something seems really wrong.

3 AnswersMathematics9 years ago### Need clarification on 2 math questions?

These 2 questions i am so confused on:

1. Simplify 0=x^2+3x+5. I tried to factor them out and i couldn't and did the quadratic formula but i got stuck...

Apparently, i got this one wrong.

2. Evaluate the following expression:

tan(sec^-1(25/7)).

I had no clue; i plugged it in the calculator and got undefined, but something seems really wrong.

Thanks for the help!!!

2 AnswersMathematics9 years ago### Need clarification on 3 math questions?

I would like to know if i got this problem correct:

Consider the equation 5x+7y=35 and 4x+ky=-27, what does the value of k have to be in order for the lines to be perpendicular?

1. i solved for y on the second equation, and got -4x/k as a slope.

2. I solved for y on the first equation and got y=-5x/7 as a slope and did the reciprocal and got 7x/5.

3. I cross multiplied and solved for k and got k=-20/7

These other 2 questions i am so confused on:

1. Simplify 0=x^2+3x+5. I tried to factor them out and i couldn't and did the quadratic formula but i got stuck...

2. Evaluate the following expression:

tan(sec^-1(25/7)).

I had no clue; i plugged it in the calculator and got undefined, but something seems really wrong.

Thanks for the help!!!

1 AnswerMathematics9 years ago### What are the 6 trig functions of -pi/4?

I am soooo lost. Are the all negative?

Any help is appreciated.

1 AnswerMathematics9 years ago### Quick help with a review book of the ACT?

I am starting to study for my ACT, and i was wondering: is the Princeton Review's 2011 edition "Cracking the ACT" the same thing as the 2010,2009, or even 2008 edition? I don't have much money, so i am wondering.

Thanks!

1 AnswerStandards & Testing9 years ago### Confused on this Trig problem?

I have to put the sin/cos/tan/cot/sec/ and csc of -pi/4 radians.

I have no clue how to do this. I was thinking of just putting negatives, but i don't know if it'll be right.

Any help is greatly appreciated :)

1 AnswerMathematics9 years ago### Can i still enter an AP class now?

So, i made the mistake of taking regular physics for my senior year. Now, i want to take AP Physics B. Is there any way i could still enter that class, even if school starts in 2 weeks? I have access to the summer assignment, so it wouldn't take me less than a day to finish it.

1 AnswerPrimary & Secondary Education9 years ago### Quick question regarding Barnes and Noble?

So i will now be shopping at B&N because Borders will be closing. I registered online at B&N and i got a coupon for 33% off the new books. But i am confused about one thing: do you need to show a card like in Borders to get the discount from the coupon?

2 AnswersBooks & Authors9 years ago### Does this work for my essay?

I am doing an analytical essay on The Crucible for AP English. I am trying to take a risk because i am analyzing the story to the story of Adam and Eve. Like, i am putting how both ended up bad and in corruption. Do you think this can work out somehow?

Thanks

1 AnswerBooks & Authors9 years ago