Sunday

October 23, 2016
Total # Posts: 3,716

**Physics**

What is the wavelength of a 512 Hz sound wave in 20 degree C air?

*April 2, 2013*

**Maths**

Suppose Z=a+bi , where a and b are integers and i is the imaginary unit. We are given that |1+iZ| = |1-iZ| and |Z-(13+15i)|<17 . Find the largest possible value of a+b

*April 2, 2013*

**Maths**

The vertices of a cube are labeled with the numbers 0,1,2,3,4,5,6 and 7, such that no two vertices are labeled with the same number. The sum of any 2 numbers on an edge is prime. What is the maximum sum of the 4 numbers on a face?

*April 2, 2013*

**Maths**

How many ordered sets of positive integer triples (a,b,c) are there such that a+b*c=100

*April 2, 2013*

**Algebra**

When factoring an equation, how do I know if the result is prime? For example, I have a problem x^2 - 2x + 4 and I think it is prime because I can't solve it. Am I right?

*April 1, 2013*

**Algebra**

I have several of these problems and am having trouble getting the hang of it. Can you help me? Factor. If the result is the square of a binomial, write it as such. If the result is prime, so state. Here are the first couple of problems. 1) x^2 + 7x + 12 2) x^2 - x - 12 3) x^2...

*April 1, 2013*

**math**

The total fencing around a square field is 80 yards. The field has an area of how many square yards?

*April 1, 2013*

**Chemistry**

I am trying to do the next one but I am still confused. Would the next one simply be HA+OH^- ----> H2O + A^- ?

*March 29, 2013*

**Chemistry**

You are given an assignment to make 250ml buffer solution having 0.25M weak acid and 0.2M of its conjugate base. You have stock solutions 1.5M acid and 0.5M of the conjugate base. Clearly explain how you are going to make this buffer solution. Can anyone please help me!!!

*March 29, 2013*

**algebra 10th grade**

Solve for x? 0 = -9/5 x -9

*March 28, 2013*

**math**

Write an inequality that represents the statement: x is less than 4 and greater than 1

*March 27, 2013*

**algebra**

6(15) + 40 = ?

*March 27, 2013*

**10 grade algebra**

please help with this problem Your dad is taking Biology as part of the veterinarian program at the local community college. This semester he will spend a total of 40 hours in the biology lab, and he will take notes in class 6 hours per week. Define a variable for the number ...

*March 27, 2013*

**algebra 10th grade**

Is it 90+40=130?

*March 26, 2013*

**algebra 10th grade**

solve the equation showing steps please 6(15)+40

*March 26, 2013*

**algebra 10th grade**

please help with this problem Your dad is taking Biology as part of the veterinarian program at the local community college. This semester he will spend a total of 40 hours in the biology lab, and he will take notes in class 6 hours per week. Define a variable for the number ...

*March 26, 2013*

**10 grade algebra**

Thanks Colin.

*March 26, 2013*

**10 grade algebra**

x=80

*March 26, 2013*

**10 grade algebra**

x=60?

*March 26, 2013*

**10 grade algebra**

solve 10(x+5)=130

*March 26, 2013*

**10 grade algebra**

Solve the equation 2(x =10)=80

*March 26, 2013*

**Calculus 1A**

thanks!!!!!!

*March 26, 2013*

**Calculus 1A**

I am trying to find: dy/dx for y = sec(tan x) I have the answer, but I have no idea how to get there. I know that the derivative of sec x = sec x tan x and that the derivative of tan x is sec^2 x. But sec doesn't have an x, so ...?

*March 26, 2013*

**Physics**

Which describes the greatest displacement? - walking 3 m east then 3 m north, then 3 m west - walking 3 m north, thrn 3 m west, then 3 m south

*March 24, 2013*

**Physics**

Aoron leaves one cify at noon. He has to be at another city 186 km away at 3:00 p.m, the speed limit the entire wAy is 65 km/h . Can he arrive At the second city on time? Explain

*March 24, 2013*

**Derivative**

I didn't realize I had to omit the y' and I got y(-2x + y)/ (y-x)^3

*March 21, 2013*

**Derivative**

Thank you!!!! i got it :)

*March 21, 2013*

**Derivative**

implicitly differentiate f(x) 2xy= y ^2 find second derivative with relevance to x and y. i get y''= -xy' - y/ (y-x)^2 this is wrong though. can someone please help me. thank you

*March 21, 2013*

**Algebra I?**

((x-3)/(x+1)) > 5 I get x < - 2 everytime I solve it, but apparently this is wrong. Can you please show me the steps? :/

*March 21, 2013*

**Derivative**

with respect to x f(cos x) if f'(x)= 1/x find (f(cos x))' i got tan x sec x this is wrong. please explain. thank you

*March 20, 2013*

**Chemistry**

A scuba diver takes a 2.3 balloon from the surface, where the pressure is 1.1 and the temperature is 28, to a depth of 35 , where the pressure is 4.5 and the temperature is 14.

*March 19, 2013*

**Chemistry**

Thanak you so much for your help, DrBob222

*March 19, 2013*

**Chemistry**

Oh, sorry. I meant to say that solution y has a 10 times higher OH- concentration compared to solution x. I hope it makes sense now. :-) Mary

*March 19, 2013*

**Chemistry**

Solution x has a pH of 4.35. Solution y has 10- times high [OH-] compared to solution x. Solution z has a pH 4.0 units higher than that of solution x. calculate the ration of [H3O+] between solutions x&y and between x&z. What is the pH of solutions y and z? classify each ...

*March 19, 2013*

**Math**

Find the HCF 1) 7x and 9 : nothing 2) x^2(x-4) and x(x-4) : its (x-4)? 3) 6b and 2b^3 : 2b ,? 4) 6(x-1)^2 and 16(x-7)(x-1) : x-1 , 5) 18y,27y, 9xy^2 : 9y 6) 5a^2 and 25a : 5a 7) 6abc, 8ab, 12bc : 2b 8) 9a^2b and 18ab^2 : 9ab

*March 19, 2013*

**English**

The team ______ won the game is my favorite. which word correctly completes the sentence above? a. which b.whom c. who d. that

*March 18, 2013*

**science**

in the digestive tract, mouth is bolus to a. stomach is to chyme b. gallbladder is to insulin c. small intestine is to carbohydrate d. esophagus is to peristalsis

*March 18, 2013*

**....**

hans uses a wheelchair. although he has a ramp to get in his house he finds it difficult to get his wheelchair up the ramp. which modification would make it easier for hans to get in his house? a. increase the length of the ram b. increase friction between the wheels and the ...

*March 18, 2013*

**....**

in the digestive tract, mouth is to bolus as a. stomach is to chyme b. gallbladder is to insulin c. small intestine is t carbohydrates d. esophagus is to peristalsis

*March 18, 2013*

**English**

hans uses a wheelchair. although he has a ramp to get in his house, he finds it difficult to get his wheelchair chair up the ramp. which modification would make it easier for hans to get in his house? a. increase the length of the ramp b. increase the friction between the ...

*March 18, 2013*

**Math**

The radius of a cylindrical construction pipe is 2 feet the pipe is 16 feet long what is the volume use the value 3.144 PI and round your answer to the nearest whole number

*March 18, 2013*

**HSC/514**

I have to choose a healthcare organization and discuss the accountability, internal and external factors I know how to do the assignment. I need to know how to find the names that would have the information available online. what would I google for?

*March 17, 2013*

**English**

The students felt fairly prepared for whatever tests their instructors might give them, after years of studying , however difficult the test might be which group of words is misplaced in the sentence above? a. however difficult they might be b. the students felt fairly ...

*March 17, 2013*

**science**

water freezes in the crack in this boulder and expands. over time, pieces of the boulder will break off. what type of weathering effectis this an example of? a. wedging b. hydration c. carbonation d.reduce pressure

*March 16, 2013*

**science**

two waves are traveling through the a container ofnitrogen . the amplitude of the first wave is .3 cm and the amplitude of the second wave is .9 cm. what is true about the two waves? a. the energy of the first wave is less than the second wave. b. the energy of the first wave ...

*March 16, 2013*

**Statistics**

0.833 inches per gram

*March 15, 2013*

**early childhood**

which of the following is best suited to a formative assessment of progress 1. muscular strength snd endurance 2. body fat analysis 3. flexibility 4. qwareness of self and space

*March 13, 2013*

**Social Studies**

What would be abolished if the limits of the Constitution did not restrict officials?

*March 13, 2013*

**algebra**

correction ..... 1/R=1/R1+1/R2+1/R3

*March 13, 2013*

**algebra**

express R as rational expression 1/R=1/R2+1/R2+1/R3 R FOR R1=5 OHMS R FOR R2=4 OHMS R FOR R3=10 OHMS

*March 13, 2013*

**..**

if you already had the chiken pox you can be arournd a person with the disease without no fear of becoming sick. what feature of the immune system explains this? a. acquired immunity b. cell- mediated immunity c. humoral immunity d. primary immune system

*March 12, 2013*

**science**

which structure is common to both prokaryotic and eukaryotic cells ? a. mitochondria b. cell membrane c. endoplasmic reticulum d. pladtids

*March 12, 2013*

**math**

a satisfaction survey is administered to 568 people. seventy- one people were unsatisfied with the product. which statement is true? a. 1 out of every 8 clients was unsatisfied b. 6 out of 8 clients were satisfied c. 1/4 pf the clients were unsatisfied d. 2/3 of the clients ...

*March 12, 2013*

**math**

which number solves the equation for x 1/3:x=1:3 a. 1/9 b. 1 c. 3 d. 9

*March 12, 2013*

**math**

which would be the approximate metric equivalent to 7 inches? a) 0.63 mm b) 1.4 m c) 12 dm d) 18 cm

*March 12, 2013*

**math**

a new physician saw 841 clients during the first year of her practice and 1,072 the second. which represents the percentage increase in client volume? a. 22% b. 27% c. 78% d. 127%

*March 12, 2013*

**math**

six hundred and thirty miligrams is equal to how many grams? a) 0.063 g b) 0.63 g c)63 g d) 630,000 g

*March 12, 2013*

**math**

a pudding recipe for 50 people calls for 4 cups of sugar. each bag of sugar contains 6 cups. how many bags of sugar will be needed to make this recipe for 300 people? a. 4 bags b. 13 bags c. 24 bags d. 50 bags

*March 12, 2013*

**English**

I need help

*March 12, 2013*

**English**

p w s a f m l x copy the letter string above on a piece of paper. cross out the second and last letters. replace all vowels with the letter C. Insert an O before the second C. cross out the first and third letters. Double the second letter. which letter sequence remains on ...

*March 12, 2013*

**math**

collecting cans and bottles for recycling. the ratio is 8 cans to 9 bottles. If you collected 240 cans how many items did you collect in all. Explain to me how you get the answer, please!

*March 12, 2013*

**science**

the team____ won the game is my favorite a. which b. whom c.who d. that

*March 11, 2013*

**science**

which rna basr sequence wod produce the amino acid sequence : Valine Proline Alinine a.GCGCGUUG B. GUGCCUGCG C. GUUCCCACU D. GCUCUUGCU

*March 11, 2013*

**science**

which rna base sequence would produce the animo acid sequence: Valine ALanine

*March 11, 2013*

**....**

p w s a f m i x copy the letters above on a piece of paper. cross out the second and last letters. replace all vowels with letters. double the second letter which letter sequence remains on your page? a. ssfmoi b.cffmmc c.sffmoc d.fscfmc

*March 11, 2013*

**algebra**

i am to consider the line -x-3y=2 what is the parallel line slope and the perpendicular line slope

*March 10, 2013*

**Critical Points**

find values for a, b, and c so that the function f(x) = x^3 + ax^2 + bx+ c has a critical point at (1,5) and an inflection point at (2,3). I got a as -6, but I don't know what b and c are. For b and c I just have b + c= 10. I do not know how to proceed thanks

*March 9, 2013*

**Minimum on a Closed Interval**

What is the minimum value of the function g(x)= 1/x * sin (pi *x) on the interval [1,2]? I got -2/3. Is this right? thanks.

*March 9, 2013*

**Absolute Extrema**

Thank you both! I appreciate it. :)

*March 9, 2013*

**Absolute Extrema**

Find the minimum and maximum values of the function f(x)= 2/3 sin pix on the interval [1,2] (domain). I got (1.5, -2/3) as the minimum and no maximum on the interval. Is it correct? Thank you.

*March 9, 2013*

**English**

Oops I meant nor for number 8. Sorry! :/ It goes 'either, or' and 'neither, nor'.

*March 7, 2013*

**English**

4) I think instead of nor use neither. 8) I would personally phrase it as: Neither my brother or I can go swimming. I'm just basing these corrections off of how I would speak it (native speaker). Hope this helps. :)

*March 7, 2013*

**math**

L can represent Lori and M for Maria. L + M = 10 L= M + 4 M + 4 + M = 10 2M + 4= 10 2M= 6 M= 3 L= 7

*March 7, 2013*

**English**

3) Just make sure that the noun closest to the blank matches the verb form! So here it should be plural since the noun right before the blank is 'Kirk', one person. (remembers) 5) It would be 'is'. Beef and broccoli is the name of the dish. It is easy to get ...

*March 7, 2013*

**Derivative **

given that f, g, and h are differentiable functions f(g(h(x))) = x what is h'(x) in terms of f, g, f', g', and h'? I plugged in equations on my own like h(x)= x^4 g(x) = 4th root of x f(x)= x^2 i need more assistance on how to proceed thnx

*March 7, 2013*

**science**

yes form of carbon

*March 7, 2013*

**social studies**

amendments in bill of rights, freedom of speech, press, liberty, and pursuit of happiness, etc.

*March 7, 2013*

**math**

minimum area for square is either 9*9= 81 or 15*15=225. 81 is less so 81 sq. inches each tile has a side length of 9 inches and you'd have a box of nine rows and nine columns of tiles like this __ |__| so each end has nine tiles * 9 inches per tile, so that's 81 inches...

*March 7, 2013*

**Math**

let's use l and w for the variables l= 2w + 1 lw= 66 yds. ^2 (2w + 1) w= 66 2w^2 + w= 66 2w^2 + w -66 = 0 (2w -11 ) (w + 6 ) = 0 2w= 11 or w= -6 w= 5.5 is positive so this is our answer!!! and the length = 2w+1 so simply plug in! l= 2*(5.5)+ 1 l= 12

*March 7, 2013*

**math**

you need 2 formulas to do this volumeof cylinder: pi*r^2*h volume of sphere: 4/3 * Pi * r^3 you wanna find out the cylinder's height since you have the diameter already. plug in; if height is equal to diameter then radius is half the height, therefore solve in terms of ...

*March 7, 2013*

**math**

You want to cancel one variable Let's cancel the x's. 8 and 3 have a LCM, which is 24 3(8x + 9y= -19)= 24x + 27y= -57 8(-3x + 7y= -24)= -24x + 56y = -192 ------------------------------------- 0 + 83y= -249 83y= -249 y= -3 Plug into the first equation to figure out what...

*March 7, 2013*

**math help re post**

two parts to this problem 1) 2x-4> 0 2) 2x-4 <8 solve each separately 1) 2x > 4 x>2 2) 2x<12 x<6 if x is greater than 2 and less than 6 write it like this: 2<x<6

*March 7, 2013*

**Derive**

Thank you SO much sir. I feel a lot better knowing that I did this right

*March 7, 2013*

**Derive**

Find the derivative of sin(2x + 3y)= 3xy + 5y-2. I have this so far 1) cos(2x+3y) * d/dx (2x+3y)= 3xy' + 3y + 5y' 2) cos (2x+3y) * [2 + 3y']= 3xy' + 3y + 5y' 3) 3y' cos (2x+3y) + 2cos(2x+3y)= 3xy' + 3y + 5y' 4) 3xy' + 5y' - (3y(cos(3x+3y...

*March 7, 2013*

**chemistry**

it is similar to percent increase/decrease formulas. initial amount= 7.26 grams final amount= 8.61 grams percent increase= |8.61-7.26|/ 7.26

*March 6, 2013*

**math**

Calculate first how many pretzels are baked in an hour to make it easier. eight trays of twelve pretzels in them each= 8 * 12= 96 pretzels/hour 96 pretzels/ hour * 8 hours/ day= 768 pretzels/ day

*March 6, 2013*

**math**

range= absolute value of highest-lowest values highest= 2.6 degrees lowest= -2.8 degrees range= |2.6- (-2.8)| range= |2.6 + 2.8| range= |5.4| range= 5.4 degrees celsius

*March 6, 2013*

**Calculus Derivative**

I'm still not quite sure how that works out, if you can explain it please? Isn't the derivative of v dv/dt and the derivative of m (since it's a constant) 0?

*March 6, 2013*

**Calculus Derivative**

Can you please explain how you derived the first half of the second line before the '-mv * (...)'? Thank you.

*March 6, 2013*

**Calculus Derivative**

I'm trying to calculate the derivative of this: P= mv/ sqrt(1-v^2/c^2)where m and c are constants, and v depends on t. I know about the chain and product rules but I'm not even sure where to start. :/ Thank you for your help.

*March 6, 2013*

**Geography**

Houston!

*March 6, 2013*

**....**

what is the southernmost city listed on the map a. Richmond b.San Jose c.Detroit d.Houston

*March 6, 2013*

**Calculus Optimization Problem**

Thank you! I solved it out, and I got x=5 and y= 10 with a product of 500. Is this correct

*March 6, 2013*

**Calculus Optimization Problem**

Find two positive numbers whose sum is 15 such that the product of the first and the square of the second is maximal. I came up with this so far: x + y = 15 xy^2 is the maximum derivative of xy^2= 2xyy' + y^2 Now how do I solve this ^ after I set it to zero? I am stuck on ...

*March 6, 2013*

**science**

independent variable affects the dependent and changes the outcome of the experiment. therefore the I.V. is what you CHANGE. D is the answer (paper plastic and glass have different insulation levels so this is what the experiment is testing)

*March 6, 2013*

**science**

mara is preparing an experiment using three cups - one made of paper, one of plastic, and one of glass- as shown below. she plans pouring 50 ml of hot water from a pitcher into each of three cups and recording the temperatures in 5- minute intervals. what is the independent ...

*March 6, 2013*

**math**

which is correct restatement of 32% a. thirty two b. thirty two tenths c. thirty two hundredths d. thirty two thousandths

*March 6, 2013*

**English**

yes at end says.. which letter sequence remains on your page?

*March 5, 2013*

**English**

pwsafmix copy the letter string above on a piece of paper. cross out the second and last letters. Replace all vowels with letter C. insert an O before the second C. cross out the first and third letters. double the second letter. help!

*March 5, 2013*