Thursday

November 26, 2015
Total # Posts: 816

**chemistry desperately**

i am completely lost, i confused myself. i need to find the concentration of HC2H3O2 HC2H3O2 + NaOH ==> NaC2H3O2 + HOH NaOH C= 0.3 M v= 0.25 L n= 0.075 moles M= 40.00g/mol m= 3.00 g NaC2H3O2 n= 0.075 moles m= 0.4973 g(ammount of acetic acid in solution) HC2H302 v= 0.020 L M...
*December 16, 2008*

**chemistry grade 11**

alright thank you:)
*December 15, 2008*

**chemistry grade 11**

(avg. ammount of substance) ( 28.0 mL + 27.3 mL + 27.5 mL ) / 3 = 27.7 mL HC2H3O2 + NaOH => NaC2H3O2 + HOH n= M x L = 0.30 M x 0.0277 L = 0.00831 mols unknown:NaC2H3O2:x:1mol:NaC2H3O2:/ known:NaOH:0.00831 mols:1 mol:NaOH: x=0.00831 mol molar mass of HC2H302: H x 4 = 4.04 C ...
*December 15, 2008*

**chemistry grade 11**

alright! thank you, you just helped me figure it out! i didnt use all the info provided properly
*December 15, 2008*

**chemistry grade 11**

i have a question about finding the concentration of a substance then changing it to a percent. i check over my notes and i can't find it. the concentration of an unkown substance is 0.831 M and the two given substances are 4% and 5.5% so i do not know howto calculate ...
*December 15, 2008*

**mathh**

thank you:)
*December 14, 2008*

**mathh**

oh shoot i wrote it wrong its: 1 + 2sinxcosx = sinxcosx sinx + cosx
*December 14, 2008*

**mathh**

this is for proving identies and its fustrating i can't solve this one question! lol x=feta (btw the first part is supposed to be divided by the bottom) 1 + 2sinxcosx + sinxcosx sinx + cosx (1 + 2sinxcosx / sinx + cosx) + sinxcosx
*December 14, 2008*

**math**

help with ratios pleeeeeeeeeeeease or i get an f
*November 8, 2008*

**business**

Other than Microsoft, is there a website where I can learn about formating business letters, memos, etc.?
*October 13, 2008*

**science**

thanks Ms.Sue for your help
*October 8, 2008*

**science**

what conditions do scientists examine when they monitor volcanoes?
*October 8, 2008*

**code of ethics**

I am working on a paper about ethics in professional healthcare/medicine. It is difficult for me to word it properly, but here goes: Is "the right to die, or assisted suicide a question of ethics-or a moral dillema that healthcare professionals face? (helping terminal ...
*October 7, 2008*

**math**

I'm surprised I didn't think of that. Thank you.
*October 2, 2008*

**math**

The average (arithmetic mean) of 4 numbers is greater than 7 and less than 11. What is one possible number that could be the sum of these 4 numbers?
*October 2, 2008*

**Math**

9a-1+8c-8a+c
*October 1, 2008*

**college**

what is another name for herpetologist? is it zoologists? thanks.
*September 23, 2008*

**physical**

t= 2.79 H=38.1
*September 20, 2008*

**internet security**

Where can one go to download free and legal music without a catch? Is there truly such a site?
*September 19, 2008*

**CALCULUS**

A PIECE OF SHEET METAL IS 2.6 TIMES AS LONGS AS IT IS WIDE. IT IS TO BE MADE INTO A BOX WITH AN OPEN TOP BY CUTTING 3-INCH SQUARES FROM EACH CORNER AND FOLDING UP THE SIDES. IF THE VOLUME OF THE BOX MUST BE BETWEEN 600 AND 800 CUBIC INCHES, WHAT VALUES OF X WILL PRODUCE THIS ...
*July 24, 2008*

**CALCULUS**

For the piecewise function, find the values g(-8), 8(3), and g(8). g(x)={X+6,FOR X<=3 7-x, for x>3
*July 24, 2008*

**math**

For the piecewise function, find the values g(-8), 8(3), and g(8). g(x)={X+6,FOR X<=3 7-x, for x>3
*June 5, 2008*

**grammar**

The researcher structures the study by addressing three topics which include the research question, the researcher’s perspective and also the sample selection. On the above sentence, do I need to put a colon after include, or is the sentence fine the way it is?
*April 15, 2008*

**grammar**

Do I use a colon or a period at the end of the following sentence? According to the author of this article, the hypothesis is as follows
*April 2, 2008*

**arithmetic**

How do you solve this problem 1 1/5 minus 3/8?
*March 25, 2008*

**spelling**

i will like to make a word with these letter aaiemctmsh
*March 13, 2008*

**Ratios Math**

i need help with ratios in math
*March 1, 2008*

**Marine Biology**

Any ideas where I can read online articles about marine species and the different types of habitats along coastal beaches?
*February 13, 2008*

**earth**

whats limestone used for?
*January 29, 2008*

**bilology**

What do algae, kelp, and seaweeds have in common? How are they different?
*January 28, 2008*

**CIS Microcomputers Application**

It could be a cookie................
*January 11, 2008*

**Physics**

I dont know what to make for a physics experiment?
*January 4, 2008*

**RE: Water**

If I boil water at home, when and how do I know I've boiled the water long enough to make distilled water?
*January 1, 2008*

**Nutrition**

What is the difference between drinking water and distilled water? Can we make our own distilled water?
*January 1, 2008*

**English**

Could you tell me which words in column A have the same vowel sound as the words in clumn B. Column A Column B Path Butter Here Weight Saw Trouble Wide Put Hit-------------- File Look Weird Stool Laugh Luck Taught Heat Cheese Table Prune Pronunciation Eye Pan Matter Thanks.
*December 19, 2007*

**Bowling**

Where can I download a bowling score sheet?
*December 14, 2007*

**math**

how do I compute sales tax? $1,367.85. sales tax rate is 5.75%. also, how do I add in city tax?
*December 9, 2007*

**Bowling**

Where can I download free score-keeping sheets for bowling?
*December 2, 2007*

** math please help**

12x^2y+18xy^2 and the answer is 6xy(2x+3y) how do you get that answer?
*November 27, 2007*

**History**

I go to the Middletown High School and I lost the combination to my locker which has my Global Histoory textbook in it. I was hoping somebody would be kind enough to tell me what the questions are on page 26 numbers 3-7 and page 31 numbers 3-7. I realize that we might not have...
*September 28, 2007*

**science (graphing data)**

on the axis of my graph i want to have my scale begin with 100 and then count by tens to 300. can I just start with 100 or do i have to put in a symbol or something first? If so, what's the symbol?
*September 12, 2007*

**math 117**

A garden area is 30 ft long and 20 ft wide. A path of uniform width is set around the edge. If the remaining garden area is 400 ft2, what is the width of the path? using the quadratic formula I did the following: Let x = distance between the inner rectangle and the outer ...
*August 9, 2007*

**Life Science**

How did Mendel novel approach contribute to his success in describing how traits are inherited Thank you for using the Jiskha Homework Help Forum. Here are some sites for you: 1. http://en.wikipedia.org/wiki/Heredity (at the bottom, be sure to click for additional information ...
*August 4, 2007*

**math/algebra**

17 simplify 3/(x-5) + 1/ 1 - 4/(x-5) The non-use of grouping symbols makes this sentence without meaning. The non-use of grouping symbols makes this sentence without meaning. 3/x-5 +1 / 1 - 4/x-5 = I never know how to write the problems so someone can understnad what I mean, ...
*July 15, 2007*

**math/algebra**

20 Divide: x^2 -49y^2/6x^2+42y divided by (x^2-7xy) = factor the first term. Multiply the first term by the inverse of the second.Combine terms. I will be happy to critique your work. (x-3)(x+5)/2(2x^2) * 2x-10 /x^2 - 25 = x-3/2x^2 ? or am I missing it somewhere :You are not ...
*July 15, 2007*

**math/algebra**

22. solve x/($a) - x/($b) = c what is this? The world wonders. believe it or not this was actually a problem that I have been given to solve. Any suggestions as to how I accomplish this?
*July 15, 2007*

**math/algebra**

subtract. express in simplest form 13x/30 - 4x/ 15 = factor the first denominator. Get a common denominator. Combine terms. I will be happy to critique your work. ok 13x/30 - 4x/ 15 = This is where I get lost, I know that I have to fins the LCD but when I do that it looks like...
*July 15, 2007*

**math/algebra**

add:Express in simplest form 4x/(x^2 -18x +72) + 4/(x-6) factor the first denominator. Get a common denominator. Combine terms. I will be happy to critique your work. ok hers goes 4x/(x-6)(x-12) + 4/(x-6)= 4x + 4/(x-6)(x -12) or am I completely lost? you factored correctly. ...
*July 15, 2007*

**math**

subtract: express your answer in simplest form. 5x-3/6 - (x+3)/6 answer choices a) 4x-1 b) 2x-3/3 c) 2x/3 -1 d) 2x/3 show me hou to arrive at the correct answer get a common denominator. get a common denominator. I thought 6 was the common denominator, why can't I use it ...
*July 15, 2007*

**math/algebra**

divide: x^2 + 2x -15/4x^2 divided by x^2-25/2x-10 answer choices a) x-3/2x^2 b) x + 3/2x^2 c) 2x^2/x + 3 d) 2x^2/x - 3 any your work is? any your work is? (x-3)(x+5)/4x^2 * 2x-1/x^2-25= x-3/2x^2
*July 15, 2007*

**math/algebra**

Subtract: express your answer in simplest form. 2/5 - y/y-2 answers a)-3y-2/y-2 b) -3y -2/5(4-2) c) -3y-4/5(y-2) d) -3y-4/y-2 The way you have written the problem, is 2/5 minus y^3. I dont think that is what you meant. Please use grouping symbols on fractions () or [] The way ...
*July 15, 2007*

**math/algebra**

Simplify: 3/4/4/5 answer choices are: a) 3/5 b) 5/3 C) 15/16 d)16/15 How do I go about solving this fraction, please show me how to work this. 3/4 divided by 4/5 1. Invert the second fraction. 3/4 / 5/4 2. Multiply the numerators and denominators. What answer do you get? 15/16...
*July 15, 2007*

**math**

During rush hour, Fernando can drive 20 miles using the side roads in the same time that it takes to travel 15 miles on the freeway. If Fernando's rate on the side roads is 9 mi/h faster than his rate on the freeway, find his rate on the side roads. What is the formula and...
*July 14, 2007*

**math**

What values for x must be exclued in the following fraction? x + 5/ -1 a) 5 b)none c) 0 d)-5 and how do I find the answer? if this is (x+5)/-1, no values. if you had a term like 1/(x-s), hten when x was equal to s, that is not allowed (rule: exclude all zero solutions in the ...
*July 14, 2007*

**math 117**

x/6- x/8=1 Find a common denominator for the two x-terms on the left. Then do the subraction to get x/? = 1 You do the rest. These are not hard questions
*July 11, 2007*

**math 117**

x/(x-2)- (x+1)/x= 8/(x^2-2x) notice that x^2 - 2x factors to x(x-2), which are found as the denominators of the first two fractions. Multiply each term by x(x-2), the rest is easy.
*July 11, 2007*

**math 117**

5/(x+6)+ 2/(x^2+7x+6)= 3/(x+1) Rewrite x^2 +7x +1 as (x+6)(x+1) Multiply both sides of the equation by that expression. You get 5(x+1) + 2 = 3(x+6) Multiply out the parentheses and combine similar terms. You will be left with a simple linear equation for x.
*July 11, 2007*

**math 117**

2/(5 )=(x-2)/20
*July 11, 2007*

**math 117**

Kevin earned $165 interest for 1 year on an investment of $1500. At the same rate, what amount of interest would be earned by an investment of $2500? At the same rate of interest, and period, the interest earned will be proprtional to the original principle. Therefore, you can...
*July 11, 2007*

**math 117**

A plane flies 720 mi against a steady 30 mi/h headwind and then returns to the same point with the wind. If the entire trip takes 10 h, what is the plane’s speed in still air?
*July 11, 2007*

**math 117**

Ariana took 2 h longer to drive 360 mi on the first day of a trip than she took to drive 270 mi on the second day. If her speed was the same on both days, what was the driving time each day? Use the same method indicated in my response to your previous post. Thanks for asking.
*July 11, 2007*

**math 117**

A passenger train can travel 325 mi in the same time a freight train takes to travel 200 mi. If the speed of the passenger train is 25 mi/h faster than the speed of the freight train, find the speed of each. Speed = distance/time Therefore time = distance/speed. Assume the ...
*July 11, 2007*

**math**

If one half of one integer is subtracted from three fifths of the next consecutive integer, the difference is 3. What are the two integers? see other post.
*July 11, 2007*

**math 117**

If one half of one integer is subtracted from three fifths of the next consecutive integer, the difference is 3. What are the two integers? i got 24 and 25. (3/5 of 25) - (1/2 of 24) = 3 (n+1)*3/5 - 1/2 n =3 Right? I will be happy to critique your thinking. I suggest start by ...
*July 11, 2007*

**math 117/algebra**

simplify comples fractions. w+3/4w-----w-3/2w it is w-3 over 4w over w-3 over 2w q/f divided by t/u is the same as q/f multiplied by u/t, or qu/ft Division is the reciprocal of multiplication. q/f divided by t/u is the same as q/f multiplied by u/t, or qu/ft Division is the ...
*July 11, 2007*

**math 117/ algebra**

Fungicides account for 1/10 of the pesticides used in the US. Insecticides account for 1/4 of all pesticides used in the US. The two ratio of herbicides to insecticides used in the US can be written 1/10 ÷ 1/4 . Write this ratio in simplest form. see the other post ...
*July 11, 2007*

**math 117/algebra**

The combined resistance of two resistors R_(1 amd R_2 )in a parallel circuit is given by the formula R_(r= 1/(1/R_1 + 1/R_2 )) Simplify the formula. Help what is this talking about and how do I work it? find R as a function fo r`1 and r2. 1/R= 1/r1 + `1/R2 R= ??? Get a common ...
*July 11, 2007*

**mat 117/algebra**

2/(5w+10 )- 3/(2w-4) please show me how to work this problem. I assume this is some sort of combine the fractions, as there is nothing equal to the sentence above. factor out 1/((5w+10)(2w-4)) 1/((5w+10)(2w-4)) * ( 2*(2w-4) - 3(5w+10) ) do the multiplication in the paren.. 1...
*July 6, 2007*

**mat117/algebra**

1)Refer to the triangle in the figure. Find an expression that represents its perimeter. lft side 3/4x, right side 5/x^2 third side 1/x^2. 2)Find the perimeter of the given figure. x/2x - 5 and 8/2x - 3. 3)The volume of the box is represented by (x^2 + 5x +6)(x + 5) Find the ...
*July 2, 2007*

**mat117/algebra**

Factor completely. ax - ay + x^2 - xy please show me how to factor this problem a(x-y) + x(x-y) = (a+x)(x-y)
*July 1, 2007*

**mat117/algebra**

find the value of the polynomial 8x - 6 when x = 1 and when x = -1 8(1) - 6= 2 8(-1) - 6= -8 -6 = is the answer -14 or -2 -8 -6 = -14
*July 1, 2007*

**mat 117/ algebra**

My question is about scientific notations. Here is the problem. What I need clarification on is the power signs. When to add, subtract or multiply? (2.4 x 10^-5)(4 x 10^-4) is the anwer 9.6 x 10^-9 or 9.6 x 10^20 The answer is NOT 9.6 x 10^20. Rember your rules of exponents: ...
*June 30, 2007*

**mat117/algebra**

If the sides of a square are increased by 3 cm, the area is decreased by 36 cm^2. What were the dimensions of the original square? Please show me the formula and how to work. That doesn't sound possible. If the sides of a square are increased, the area must also be ...
*June 27, 2007*

**mat117/algebra**

factor each polynomial completely. to begin, state which method should be applied to the first step, given the guidelines of this section. Then continue the exercise and factor each polynomial completely. 2p - 6q + pq - 3q^2 Please help, I don't know how or where to begin...
*June 27, 2007*

**mat117/algebra**

Rewrite the middle term as the sumof two terms and then factor completely. Please show me the formula and how to use it correctly. 12w^2 + 19w + 4 19w can be written as 16w + 3w. Those are the cross product terms when multiplying 4w times 4 and 3w times 1. That is a clue that ...
*June 27, 2007*

**mat117**

Factor each expression a^2(b-c)-16b^2(b-c) Help show me how (b-c) appears in both terms and can be factored out, giving you (b-c)(a^2-16b^2) Now note that the second term can also be factored since it is the difference of two perfect squares. (a^2-16b^2) = (a+4b)(a-4b) Make ...
*June 26, 2007*

**mat117**

Determine whetere each of the following trinomials is a perfect square. If it is, factor the trinomial. x^2 - 24x + 48 I cannot get the 24x I've tried (x-24)(x - 2) What am I doing wrong? It is not a square. THe factors are 21.797 and 2.20, approximately.
*June 26, 2007*

**mat 117/algebra**

Find a value for k so the 9m^2-kn^2 will have the factors 3m + 7n and 3m -7n. Please show me how to get this and show the work please. Use that (a-b)(a+b) = a^2 - b^2 So, you can read-off that k = 49.
*June 26, 2007*

**mat 117/algebra**

Find all positive values for k which each for each of the following can be factored. (1) x^2 + x + k) k<= 1/4
*June 25, 2007*

**Penguins**

Which species of Penguins is the largest? Check this site for the penguin species that's the largest. http://www.enchantedlearning.com/subjects/birds/printouts/penguins.shtml
*June 25, 2007*

**mat117/algebra**

The area of a rectangle of length x is given by 3x^2 + 5x. Find the width of the rectangle. Show me the formula and how to use it please. area= length times width 3x^2 + 5x = x * width divide both sides by x, then you have width.
*June 24, 2007*

**mat 117/algebra**

Find the GCF of each product. Please show the steps so I can work the problem by myself. it is 6y squared - 3y (6y^2-3y)(y+7) 3y(2y-1)(y+7) 3y will be the greatest common factor, as each term when you multiply it out will have a 3y. In case you want to work it out.. 3y(2y^2+...
*June 24, 2007*

**math117/algebra**

The price of an item is given by p=2xsquared - 100. Find the polymonial that represents the revenue generated from the sale of x items. Multiply the price term, 2x^2 - 100, by the number of sales, x. That should be the revenue from selling x units. The p(x) relationship you ...
*June 23, 2007*

**math 117/algebra**

The US population 1990 was approximately 250 million, and the average growth rate for the past 30 years gives a doubling time of 66 years. The above formula for the US then becomes P(in millions) = 250 x 1(y - 1990)/66 (1) What will the population of the US be in 2025 if this ...
*June 22, 2007*

**math 117 algebra**

The cost i dollarsof manufacturing w wing nuts is given by the expression 0.07w + 13.3. Find the cost when 375 wing nuts are made. What is the average cost to manufacture one wing nut? Put in 375 for w, and compute the cost. Average cost= costabove/w I'm sorry this still ...
*June 22, 2007*

**math/algebra**

1) The length of one of the equal legs of an isisceles triangle is 8cm less than 4 time the length of the base. If the perimeter is 29 cm, find the length of one of the equal legs. a) 4 cm B) 5 cm C) 11 cm d) 12 cm 2) The perimeter of a rectangle is to be no greater than 300 ...
*June 14, 2007*

**math/algebra**

The sum of tow numbers is 71. The second is 7 more than 3 time the first. What are the two numbers? let x = the smaller number then you know that 7+3x +x =71 solve for x
*June 10, 2007*

**math/algebra**

Sally bought three chocolate bars and a pack of gum and paid $1.75. jake bought two chocolate bars and four packs of gum and paid $2.00. Find the cost of a chocolate bar nad the cost of a pack of gum. 3C + 1G= 1.75 2C + 4G=2.00 solve. I know that i have to eliminate the c'...
*June 10, 2007*

**math/algebra**

Rewrite the equation -x -6y = -6 as a function of x. add x to both sides, add six to both sides.
*June 10, 2007*

**math/algebra**

solve each of the following systems by substitution. 16) 5x -2y = -5 y - 5x = 3 20) 8x -4y = 16 y = 2x - 4 28) 4x -12y = 5 -x + 3y = -1 Step one: Solve on of the equations for one of the variables. y=2x-4 Step two:Substitute the expression for the variable found in step one ...
*June 7, 2007*

**math**

if f(x= 5x - 1 find f(a-2) Please show me the work so I can understand how to arrive at the solution. Thank you. f(a-2)=5(a-2)-1
*June 1, 2007*

**math**

the inventor charges $4.00 per unit, then her profit for producing and selling x units is given by the function P(x) = 2.25x - 7000 (a) What is her profit if she sells 2000 units? (b) What is per profit if she sells 5000 units? (c) What is the break-even point for sales? (a) ...
*June 1, 2007*

**math**

I have a graph that shows a ---- kind of 3 line above the solid line for x & y. My assignment is as follows. Whe have graphed the boundary line for the liear inequality. Determine the correct half-plane. y >3 First how do I solve and 2 how do I graph it? If the allowed area...
*June 1, 2007*

**math**

How do you factor 3x^2-x-4? thanks in advance How do you factor 3x^2-x-4? thanks in advance 3 times what = 3? 3 of course. giving you (3x+/-a)(1x+/-b). a and b can only be 1 and 4 or 2 and 2. Can you take it from here? (3x-4)(x+1)?
*May 10, 2007*

**Physics**

If you have steel and wood at 0 Celsius, which is colder Both are the same temperature.
*March 11, 2007*

**computers**

What are Active X controls? Are we supposed to "enable" or "disable" them? does not matter http://www.webopedia.com/TERM/A/ActiveX_control.html You have to use your judgment, depending on which program seems to be requiring it.
*February 15, 2007*

**computers**

What are the main points to consider when choosing a monitor? What is the footprint? The user's eye sight. Cost. There may be othrs.
*February 9, 2007*

**computer science**

Is there a website that explains computer terms and definitions? http://www.computeruser.com/resources/dictionary/ http://www.webopedia.com/ Another site from your first post is below.
*January 12, 2007*

**computer science**

Is there a website that explains computer terms and definitions? http://whatis.techtarget.com/
*January 12, 2007*

**Microeconomics**

I don't know why you said it was perfectly inelastic when is not. Is relative elastic
*December 8, 2006*