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July 29, 2014

Search: math(need to know if i worked this right)

Number of results: 127,784

math(need to know if i worked this right)
simplify x-3/3 - x-2/5 5(x-3) - 3(x-2)/15 5x-15 - 3x+6/15 is it :2x-21/15???
April 9, 2008 by Sandra

math
I need to see if i worked this problem right. -8 - -7 =-15 -8+-7=-15 do i add this together aredo i subtract and get -1
September 28, 2010 by davis

English
1. What was their job? 2. They worked at a bakery. 3. He worked at a bakery, and she worked for a bank. 4. What were their jobs? 5. He worked at a bakery, and she worked for a bank. 6. They worked at a bakery. (Will you look at the questions and answers? Which ones are not ...
April 15, 2010 by rfvv

Maths
Hi! I need help. I have worked out total rainfall, I have the monthly average (given by beauro) and I worked out the mean rainfall each month. My teacher says I need to work out the amount of rainfall in m-cubed that would fall on the roof each month. How would I do this? ps. ...
March 31, 2011 by JJ

math
whatis the effective rate of $23,000 invested for one year at 6%, compounded semiannually? round your answer to the nearest tenth. could you help me with this one? i need to see the math worked out please. do you have one worked out on the page so i dont have to wait too long.
November 13, 2012 by linda

math 156
Dan, Shelly, Kirby worked together on a lawn. together they earned $4000. Dan worked 40 hrs, shelly worked 25hrs and Kirby worked 15 hrs. how should they divide the money? This one I do not understand, can anyone help me?
December 3, 2009 by Rmz

Advanced Alegebra
How do I solve the following problems? My homework was to correct a puiz that I failed, but I do not know how to solve these problems..please help! Solving systems of equations using elimination: 7.) 10x - 10y = 0 5x - 4y = 8 Answer (8,8) I got the right answer because this ...
September 20, 2012 by JT

Physics (Checking answe)
Sorry for re-posting but I need to know if I did it right, please help, I worked out the problem I just want to know if I did it right. A shopper in a supermarket pushes a cart with a force of 35 N directed at an angle of 52(angle sign here) downward from the horizontal. Find ...
October 24, 2010 by Edwin

Physics
Need help with a question! I worked out A (assuming its right) which leads to B. A) C=1.03x10^-4 uF, A=2.5mm^2, d=0.75um B) If the voltage across the membrane is delta V= 75mV, what is the charge +_Q on each surface A? thanks!
May 7, 2014 by Son

pig skin
NEED ANSWER TO WEEK 11. RIGHT NOW. IT IS DUE TOMORROW!!!! =( HELP!! If you tell us the question and the answer you've worked out, we'll be glad to help you.
November 15, 2006 by ME TOO!!! Week 11!!

RADICAL EXPRESSIONS/ALGEBRA 2
Hi. I pretty much have the answer for these problems that I worked out just need to know if there right. Thank you all! 1627 + 7108 = 903 1693 + 7363 16 . 33 + 7 . 63 (48 +42)3 903; And 600x^4 = 100 . x^2 . 6 = 10x^26
February 9, 2011 by AMY

ALGEBRA
Please help anyone if you can This one is really confusing me I need the IQR for these set of numbers 0.10,0.18,0.20,0.21,0.24,0.24,0.25,0.26,0.28 What I did was place them in order and worked my way from both end until I got in the middle I came up with 0.24 but not sure if ...
December 22, 2010 by MATH 115 SEC. 8.5 PG 646

Math
1. Mackenzie spent a lot of time on her project for Columbus Day. On Monday she worked for 2 hours and 33 minutes on making a poster. On Tuesday she worked for 1 hour and 28 minutes drawing a picture of Columbus. On Wednesday she spent two hours building a model of a Taino ...
April 1, 2014 by Anonymous

Math...Geometry
Hello, Can someone please tell me if I worked this out correct and ended with the right answer? Thank You... I need to find the area and Height of this right triangle ( only knowing the lengths of its sides)side 6,5,11... Is this correct? sides 6, 5, 11 -- 6+11+5/2 =22/2=11 A&...
August 3, 2007 by Mandi

math
the hypothenus of a right angle triangle is 6cm with respect to the other two sides, one is 2cm longer than the other. Find the length of the two other sides to the nearest tenth. when i worked out this question, I got the answer as X=-5.1 or X=3.1 is my answer right, if it is...
January 3, 2011 by ted

Math
1. Mackenzie spent a lot of time on her project for Columbus Day. On Monday she worked for 2 hours and 33 minutes on making a poster. On Tuesday she worked for 1 hour and 28 minutes drawing a picture of Columbus. On Wednesday she spent two hours building a model of a Taino ...
April 1, 2014 by Sue

2nd grade
jose worked for 13 minutes weeding the garden. when he has worked 20 minutes he will get a dollar, how many more minutes does he need to work to get the dollar?
November 4, 2010 by Anonymous

math
x+2/x+3=x-1/x+1. Solve the following equation for x. The solution is ? Thank you for your help have worked this problem and ones like this for hours can't get the right answer:)
July 3, 2009 by Kay

5th grade word problem
jen,paula, and sarah spent the weekend decorating a neighbors house. They earned $500.00 between them. When it came to dividing the money, paula had worked three times harder than jen and sarah had worked twice as hard as paula. If the money was divided fairly and according to...
November 11, 2010 by tryston

programming
Week 3 - Expand Pseudo Code The accounting office indicated the code must be able to handle overtime hours. Add functionality to your pseudo code so that if more than 40 hours are worked, the hours over 40 receive time and a half (1.5 * pay rate). Your new output will need to ...
February 22, 2010 by John

English
1. He worked in Mr. Batular's circus. 2. He worked in circus. 3. He worked in the circus. 4. He worked in a circus. (Which expressions are grammatical?)
December 18, 2013 by rfvv

math
chip worked at the animal shelter for 6 hours each week for several weeks. he worked for a total of 42 hours. which of the following can be used to find the number of weeks chip worked at the animal shelter?
January 30, 2014 by renan

Math
My teacher gave us a puzzle. I have worked on it for 2 hours with both my parents and they can not figure it out. 0 o 0 o 0 o 0 o 0 In the above there are 5 squares. Top left, top right, bottom left and bottom right, and the last one formed by the o's diagaonally. Arrange ...
November 22, 2010 by Tim

Math
Greg needs 234 feet of baseboard to finish trimming the floors in his house. He has 145 3/4 feet of baseboard. How much baseboard does he need to buy? 233 4/4 - 145 3/4 _________ 88 1/4 Am I working this correct? Yes. That is right! :-) Yes..... I have worked through that!! ...
February 23, 2007 by Alisha

math question
How do i solve this? If it helps i think its B. from how i did it but i dont think i worked it out right X/4 + 1= -6 A.2 B.-4 C.-22 D.-28
May 25, 2014 by matt

reading
what reasons might Henry V have had for calling all the soliders, both noble and common, his brother in St. Crispian's day i think because they all worked together in the war. when they have worked and defeated the enemy together they are common, noble hard workers, and ...
March 13, 2012 by Taylor

Math (surveying)
I am having a really hard time figuring this problem out. I need to see how it is worked. THANKS!
October 15, 2010 by Kasey

??
why do you times 8.6x1.5x8? where does the 8 come from? You said the employee worked 48 hours in a week, right? 40 hours were paid at his regular rate ($8.60/hour or 8.6), and the extra 8 hours (overtime) were paid at time and a half (8.6 x 1.5). Once you know what the ...
July 28, 2007 by chrissy

Math!(Need More Help!I did #4,is ti right?)
Directions:Write inequalities for the numbers 3 - 4 below. Do not solve them! Problems: 3.Stacey and Luis volunteer at the local hospital. Stacey worked 4 more hours than Luis, and together they worked more than 28 hours. What is the least number of hours each worked? 4.Mrs. ...
June 24, 2007 by Erica!!!

math
two mechanics worked on a car the first mechanic worked for 5 hours and the second mechanic worked for 15 hours together they charged a total of 1750 what was the rate charged per hour by each mechanic if the sum of the two rates was 160 per hour
March 5, 2013 by mace

English
1. He worked hard to be a best baseball player. 2. He worked hard to be the best baseball player. (which one is right? Do we have to use 'a' or 'the'? Do they have a different meaning?)
March 18, 2013 by rfvv

Physics
In one dimension, a 5g ball is moving to the right at 7 m/s collides with an 8g ball moving to the left at 4 m/s for a perfectly elastic collision. What is the final velocity of both balls? I just don't understand the whole left and right thing. I have already worked it out I ...
April 25, 2014 by Michelle

chemistry
thanks DrB I got AgCl also Could you check this problem as well? If you start with .500 moles of NaF, how many moles of CaF will form? I got .250 that is correct as far as i know i got the same thing That's correct. Your answer is right. I can only assume you worked it right. ...
January 29, 2007 by key

math
I need some explanation on how to to this problem. (a) 3/3^-4 the answer is suppose to be (a)243 i worked on it and i placed the ^-4 to the top so then i got 81/3= 27 so (a) 27... tanks in advance if anyone can explain..
September 11, 2010 by anonymous

math
I need some explanation on how to to this problem. (a) 3/3^-4 the answer is suppose to be (a)243 i worked on it and i placed the ^-4 to the top so then i got 81/3= 27 so (a) 27... tanks in advance if anyone can explain..
September 11, 2010 by anonymous

math
Terrance describes the amount of money made based on the # of hours worked by the function rule y= 10h. Given this function how much $ does terrance earn for each hour worked?
February 2, 2011 by Cara

Math
He describe the amount of money made based the number of hours worked by the function rule y= 10h. Given this function, how much money does he earn for each hour worked? Thanks
January 15, 2013 by Clashy

math
6 builders worked 8 hours a day for 10 days to complete a job.If 8 builders worked 6 hours a day for 3 days,the remaining work has to be completed by 6 builders in 8 days.How many hours does each builder need to work each day?
August 11, 2012 by don

math
6 builders worked 8 hours a day for 10 days to complete a job.If 8 builders worked 6 hours a day for 3 days,the remaining work has to be completed by 6 builders in 8 days.How many hours does each builder need to work each day?
August 11, 2012 by don

Algebra
Find the number of full 8 hours shifts that Cleo worked last month. He worked three times as many 8 hour shifts as 6 hour shifts. He worked a total of 180 hours.
April 7, 2009 by Renae

math
last week Coughy worked 4 hours more than Achewy. she also worked twice as many hourse as Pokey. altogether, they earned $252. if couphy earns $6.50 per hour, Achewy earns $9 per hour, and Pokey earns $5 per hour, find the number of hours that each worked.
June 6, 2012 by Josh

math help
Can someone explain to me the following step by step , i 've looked in websites , plus the book and i want to understand how this problem has this answer. Problem #1 Find the inverse if it exists, for the matrix. -2_1_3 3_-1_0 -4_2_0 Answer is: -4_6_5 -8_12_13 2__0__-1 sorry ...
July 22, 2007 by student

DrBob222
On Monday you helped me to understand and answer the one question, but I am not too sure if they want all the calculations that you answered... regretably, I am still a bit lost with these! Below is the question as it is printed: The isotope caesium-137, which has a half-life ...
February 7, 2007 by Mary

Algebra
Can someone help me on this problem I worked it and worked it and cannot figure it out?? Z + < Z + 1/16
November 25, 2010 by TRACY

Geometry
I need help... Did I end up with the correct answer? A trapezoid has equal nonparallel sides, The upper base is 6, the lower base is 16 ( 11,5) and the diagonal is 12. What is the altitude of the trapezoid? Round your answer to the one decimal place. I was told this is how to ...
July 7, 2007 by Mandi

Geometry
Need help I missed this problem on my test. My answer was 31.8in^2. The right answer was 8.0in^2 How should I have worked the problem: A pie has a diameter of 9 inches. Each slice of the pie has a central angle of 45 degrees. What is the area of each slice of pie?
April 18, 2011 by mary

math
compute the average of the following numbers:17, 33, 45,66 and 135 I need to see the problem worked out step by step thank you.
February 6, 2013 by steve

math
thankyou so much in advance.I need to write an equation in the variable x having -sqrt5,6sqrt5 as solutions. This needs to be in standard form ax^2 + bx +c =0. Thank you again and can you show me how you worked It?
November 12, 2010 by barb

math
point A(-1,-2) B(7,2) C(k,4) K is a constant. The vertices of ABC. Angle ABC is a right angle. Ive worked out the gradient of AB to be 1/2. How do you calculate the value of k?? thanks for the help
October 13, 2010 by liam

BEDMAS with decimals
Hi, I'm having trouble with this question that I have worked on, but I didn't get the right answer. 25.1 + 11.4 / 7.5 (3.75)
October 24, 2011 by Alex L.

math
point A(-1,-2) B(7,2) C(k,4) K is a constant. The vertices of ABC. Angle ABC is a right angle. Ive worked out the gradient of AB to be 1/2. And the negative reciprocals is 2. How do you calculate the value of k?? thanks for the help
October 13, 2010 by liam

math
point A(-1,-2) B(7,2) C(k,4) K is a constant. The vertices of ABC. Angle ABC is a right angle. Ive worked out the gradient of AB to be 1/2. And the negative reciprocals is -2. How do you calculate the value of k?? thanks for the help
October 13, 2010 by liam

math
Katy babysat to make some money, but Katy has not worked any hours so (x=0), she has not earned any wages so (0,0) would be one coordinate. Katy earns 10 dollars an hour. She then worked 3 hours, so she now has $30.00, so (3,30)is another point. Katy worked 15 hours earning ...
May 9, 2014 by Caitlan

Math(ratio)
Gretchen, Miranda and Ariel worked a total of 105 hours this week. If the ratio of Gretchen's hours to Miranda's to Ariels is 1:4:2, what is the difference between the number of hours Miranda worked and the number of hours Ariel worked?
September 20, 2013 by Anonymous

science
I am doing a project on Isaac Newton and have to find info on born,died,study, famous scientists he worked with,apple and laws of motion. I have found all the answers except the famous scientists he worked with. I have been on lots of websites but I cannot find one which says ...
February 3, 2010 by Janey

Chemistry
can anyone check and see if i balanced the equation for the combustion of benzene correctly, thank you. C6H6 + O2 --> CO2 + H2O Answer: C6H6 + 15O2 --> 6CO2 + 3H2O It doesn't look right to me; however, you can check ALL balanced(?) equations and know when you are right ...
August 7, 2007 by Anonymous

pre calc trig check my work please
sin x + cos x -------------- = ? sin x sin x cos x ----- + ----- = sin x sin x cos x/sin x = cot x this is what i got, the problem is we have a match the expression to the equation work sheet and this is not one of the answers. need to figure out what im doing wrong so i can ...
October 20, 2010 by Anna

math set 4
dave and anita each earned the same amount of money selling newspapers but each worked different number of days. dave worked for 8 days.he earned 15$ less per day then anita did. anita worked for 4 days. how much did each earn altogether? how much money did each earn per day? ...
November 13, 2008 by help

math
mr. pursley, have you ever worked geo., trig. etcwith no calu.s with the heat on , when it had to be right?wheather you blew up your target or something else or the bld. collapsed or was built in the correct place? i'm not an answer grazer, but qam an answer seeker.I'm trying ...
July 22, 2011 by mac

Math Word Problem
During the summer throughout high school and for a year after, Lewis worked as a lifeguard at the beach. In that 5-year period, he saw a total of 461 dolphins swimming in the distance. About how many did Lewis spot per summer in the 5 summers he worked?
October 10, 2013 by Jared

Math-Asap
I have another expression that I need help with. If the hours worked are less than or equal to 40 return the pay as hours worked times hourly wage. -hours*hourlywwage (this is my expression) Otherwise return the pay as the first 40 hours worked times the hourly wage plus those...
April 17, 2007 by Soly

math
amy is paid time and a half for hours worked in excess of 40 hours and double time for hours worked on sunday. If her weekly wage was $342 for working 50 hours, 4 of which were on sunday, what is her regular hourly rate?
September 1, 2008 by lily

math
anita earned $475.54 in 2 weeks have earned the same amount of money each hour that she worked if anita worked a total of 62 hours during those 2 weeks about how much did she earn each hour?
May 13, 2013 by ally

algebra
can you show the problems worked out x-y=3 if x=1,2,3,4 etc... and -x+4y=9 if x = 1,2,3,45,6 etc.. I need to graph coordinates. Thanks
February 1, 2010 by sherry

MATH :[
dave and anita each earned the same amount of money selling newspapers but each worked different number of days. dave worked for 8 days.he earned 15$ less per day then anita did. anita worked for 4 days. how much did each earn altogether? how much money did each earn per day? ...
November 13, 2008 by not a good math person

math
May and Bill took 49 hours to complete their History project. They worked separately on their own project. If May had worked 5 hours less and Bill had worked 6 hours more, May would have put in 2 hours more than Bill. How many hours did May put in for the History project?
April 18, 2012 by Al

math
you need 39% correct out of a %100 tesy how many would u need right
September 10, 2008 by frank

algebra
Hey I am trying to help my son in math. The question is, The scale of a district map is 1 over 10000. Find the distance on the map, in centimeters, for each of the following distances. a) 800m b) 5 km I need to see how this is worked out.
August 31, 2010 by Helpless Dad

math
Find the equation of the tangent line to y=6^((x^2)-4x+8)) at x=3. I have worked very hard on this problem, but I can not find the right answer.... I keep getting: y=[(ln6)(6^5)(6)]+[7776-[(ln6)(6^5)(6)]]=7776, but it says this is not correct. Please help!
October 9, 2007 by al

Chemistry- Writing Net Ionic equations
I need to write the net inonic equation for (NH4)2SO4(aq) and KNO2(aq). I need to know the reactants and the product. I worked it out and got: 2K+(aq) + SO4-(aq) ----> K(SO4)2(s)
March 1, 2010 by Tiffany

chemistry
How many grams of CO2 are contained in 550 mL of the gas at STP I've worked all of these questions and I'm trying to see if I'm right, and if not, where I went wrong.
October 19, 2010 by lavonne

math
hi im in 5th grade i need help with naming angels like e.g right angel,acute,obtuse i lost my thing to measure angels plz help! lol i need it done today tomorrow i need to give it back!!
October 20, 2009 by Areta

Math
Annie's math test scores are 68 82 82 88 92 98 Her median test score is.. A.30 B.82 C.85 D.88 C? The high temperature for the last 5 days were 28,28,32,55,77 What is the range? A.28 B.32 C.44 D.49 D? The high temperature for six days in August were 93,98,100,102,102,105 What ...
March 21, 2013 by Jerald

ALGEBRA
Hello. Three quick questions that I have worked on just need confirmation. 1. I need to find the intercepts and then use them to graph the equation. 2y-6=2x; I have x = 0 for y - intercept; 2y-6=2(0); 2y-6 = 0; 2y = 6; y = 3. I set y at 0 also. 2 (0) - 6 = 2x; -6=2x; -3=x. so ...
November 9, 2010 by Amy

algebra
Hello. Three quick questions that I have worked on just need confirmation. 1. I need to find the intercepts and then use them to graph the equation. 2y-6=2x; I have x = 0 for y - intercept; 2y-6=2(0); 2y-6 = 0; 2y = 6; y = 3. I set y at 0 also. 2 (0) - 6 = 2x; -6=2x; -3=x. so ...
November 9, 2010 by Amy

Math!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
In a project, Mr Tung's daily wage was $100 more than Mr Pang's. Although Mr Tung worked 3 days less than Mr Pang, both of them earned $3600. Find the number of days Mr Tung worked in the project.
September 7, 2013 by Nicole

Math help
I need help solving each equation by the substitution method. 1. X=5y-1 X+2y=13 2. -2x+3y=11 X=4y-3 3. X=-9y-1 2x+4y=5 I need help on these so please guide me in the right direction because I'm struggling on this topic!!
January 28, 2014 by Anonymous

Advanced Math
Find the maximum and minimum values of f(x,y)=3x+y for the polygonal convex set determined by x>or equal to 1, y>or equal to 0, and x+0.5y<or equal to 2. I worked it out and got Maximum: 6; and Minimum: 3. Is that right?
November 3, 2009 by Briana

ALGEBRA PLEASE HELP!!
Hello. Three quick questions that I have worked on just need confirmation. 1. I need to find the intercepts and then use them to graph the equation. 2y-6=2x; I have x = 0 for y - intercept; 2y-6=2(0); 2y-6 = 0; 2y = 6; y = 3. I set y at 0 also. 2 (0) - 6 = 2x; -6=2x; -3=x. so ...
November 10, 2010 by Amy

Math
Directions:Write inequalities for the numbers 2 - 4 below. Do not solve them! Problems: 2.Your quiz grades are 19, 17, 20, and 15. What is the lowest grade you can receive on the next quiz and maintain at least an 18 average? 3.Stacey and Luis volunteer at the local hospital. ...
June 20, 2007 by Erica

Math
I need need help with this math problem. I need to know do I start from left to right with the parentheses or brackets first. (15-5)/[(12/2*2)-2] Brackets first Work from the outside in. When you wrote 12/2*2, it is not clear whether you mean 12/(2*2) or (12/2)*2. If you meant...
August 3, 2007 by ms kay

Math!Please Help!
Directions:Write inequalities for the numbers 2 - 4 below. Do not solve them! Problems: 2.Your quiz grades are 19, 17, 20, and 15. What is the lowest grade you can receive on the next quiz and maintain at least an 18 average? 3.Stacey and Luis volunteer at the local hospital. ...
June 22, 2007 by Erica

Math
Mary and Aperna worked together to mow a neighbor's lawn. They were paid $25.50. To split the money equally Mary wants to divide by 2. Aperna disagrees and says that we need to multiply. by how much do we need to multiply? explain. Please help i don'seem to understand how can ...
December 28, 2013 by Samrah

Math
lisa cut a log into 4 pieces in 6 minutes. she then cut a smaller log into 8 pieces. how long should the job have taken if she worked at the same rate she had worked when cutting the first log? show all work and prove your answer.
October 31, 2010 by DIana

math 156
june wants to work for 15 1/2 hours at her part-time job this week. she has already worked 8 3/4 hours. how many more hours does she need to work?
February 18, 2011 by Anonymous

Geometry MATH CHECK
Check? In your own words, explain why we use the formula AB = |a - b| to find the distance of a segment. Include why you need to subtract and why you need to take the absolute value. We use that formula |a-b| because a and b are representing coodinate numbers you need to ...
August 14, 2013 by Vanessa

English
They worked in the garden, but they worked wrong? What did they dod wrong? (Is the sentences grammatical? Do we have to use 'wrongly' instead of 'wrong'?)
November 7, 2012 by rfvv

Math
Math Problem: Find the area of a circle that has a radius of 14 feet. Round your answer to the nearest hundredth. Would someone please check the way I worked this and let me know if I did it correct or not? Thank You A=3.14 (14ft)2 A=3.14 (196) A=615.44 Im thinking I didn't ...
April 26, 2013 by John

I need help with this math question
Find the weight of the right rectangular prism with length 13 ft, width 6 ft, and height 2.5 ft if the contents weigh 0.02 pounds per cubic inch. I think that the answer is 3.9 by multiplying 6 x 13 x 2.5 x 0.02. Is this right?
November 13, 2007 by robert

Math
Is this equation right is it worked correctly x 1 ----- - -------- x2-4 x2+4x+4 This is how she simplified it: x(x2+4x+4) - 1(x2-4) ------------------- (x2-4)(x2+4x+4) x3+4x2+4x-x2+4 ------------- x4+4x3-16x-16 x3+3x2+4x+4 ------------ x4+4x3-16x-16 1+3x2+1+1 --------- x4+4-4-...
October 24, 2008 by Nadine

Math/fractions
I need help with subtracting fractions I have no idea if I'm doing it right. Please help. 3/7-9/21 Fist you find a least common denominator, right? So it's 21 Do you then multiply 3/7 to 3/3 so it will be 9/21 So, 9/21 - 9/21 = 1
September 20, 2013 by Lilly

GRAMMAR
I used these in sentences, I just need to know if they are verbs? 1.Education is 2.have taken 3.will give 4.worked 5.will be leading
January 1, 2011 by Anonymous

Algebra
I have this math probelm z-(3z)/(2-z)=(6)/(z-2) in my book it says to solve the equation. I have worked this problem many times and I keep comming up with different answers. When I use an online calculator to check my work it is giving me an answer of z=-3 I have not gotten ...
August 11, 2010 by Jessica

Physics
I believe I've done this right A penguin sildes 1.5 m/s across the ice on her belly. The coefficient of kinetic friction is .02 How far will she slide before stopping? I do not need to see the work to this problem just need to know if I did it right. I got about 5.7 m I am ...
January 5, 2010 by Kate

5th grade Math
Kate is going to carpet her living room floor and drew the diagram shown. (I am not able to submit the drawn diagram. However I will try to describe) The diagram is a rectangle: It is 16 feet at the top showing a right angle at the top left and a right angle at the top right. ...
December 12, 2009 by Please Help

Chemistry
A silicon chip is used in an integrated circuit of a microcomputer has a mass of 5.68 mg. How many Si Atoms are present in this chip. Okay here is how I worked it. Can someone please tell me if its right? 1 mole of Si = 28.086g = 6.022 x 10^23 5.68mg of Si 1g/1000mg = .00568g ...
January 6, 2009 by Chopsticks

chemistry
The compound adrenaline contains 56.79% C, 6.56% H, 28.37% O, and 8.28% N by mass. What is the empirical formula for adrenaline? i worked the problem out and got C8O3N but its not right..what did i do wrong?
January 5, 2009 by lyne

math
mistyped before. A sphere has a volume of 500/3 pi cubic centimeters. What is the total surface area in square centimeters, of the sphere? The correct answer is 100pi, but I have no idea why. I need to see it worked out from start to finish :(
October 14, 2011 by robby

Math-probability
Am I right? Did I write the solution the right way or do I need to put 50% or 50%? consider the experiments involving rolling a single die once. Give the probabilities of the event described. What is P (even or prime)? Would my answer be P(e)=3/6 or P(p) = 3/6
April 27, 2010 by bwb

Math
Solve the puzzle =RIGHT(LEFT($B$2,84),1) =RIGHT(LEFT($B$2,17),1) =RIGHT(LEFT($B$2,138),1) =RIGHT(LEFT($B$2,2),1) =RIGHT(LEFT($B$2,234),1) =RIGHT(LEFT($B$2,138),1) =RIGHT(LEFT($B$2,4),1) =RIGHT(LEFT($B$2,173),1) =RIGHT(LEFT($B$2,2),1) =RIGHT(LEFT($B$2,209),1) =RIGHT(LEFT($B$2,4...
November 9, 2012 by Suzanne

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