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Posts by kelly

Total # Posts: 1,750

Math, Quadratics
Hi Damon, I got the same answer as you up to the equation x^2 + 30x - 200=0, but after that I don't understand what happened after that.. where does the 900 and 800 come form? and why you do divide by 2? thanks

Math, Quadratics
Adam has a hockey rink in his backyard. The current dimensions are 10m by 20m. Adam wants to have a hockey tournament and needs to double the area of his hockey rink. How much must Adam increase each dimension if he wants to increase them the same amount?

physics
A rocket is fired at a speed of 75.0 m/s from ground level, at an angle of 59.7° above the horizontal. The rocket is fired toward an 11.0 m high wall, which is located 28.5 m away. The rocket attains its launch speed in a negligibly short period of time, after which its ...

Chemistry
What mass of sodium bromide (NaBr) is required to make 250 cm3 of a 0.35 mol.dm-3 solution?

Chemistry
320g of sulfur dioxide react with 32.0g of oxygen and excess water to form sulfuric acid (H2SO4) a. What is the limiting reagent? b. What is the theoretical yield of product? c. How many grams of excess reagent will remain?

Chemistry
Ethane (C2H6) reacts with oxygen to produce carbon dioxide and water. Assuming there is an excess of oxygen, calculate the mass of CO2 and H2O produced from 1.25 g of ethane

7th grade Math
Sorry Eric, yes I did mean 43 (typo sorry)

7th grade Math
Assume that there are 100 marbles in each bag. Firstly divide 100 by 7 (ratio 4:3) 14.28. Multiply 14.28 by 4 = 57.12 *57 marbles Mulitply 14.28 by 3 = 42.84 *53 marbles Secondly do the same for ratio 3:2 Divide 100 by 5 = 20 Multiply 20 by 3 = 60 marbles Multiply 20 by 2 = 40...

fifth grade math
Daughter has homework problem. P(3,6) is only thing listed. ?

math
Correction...it is supposed to be P(6,3)

math
We don't understand

math
P(3,6)

statistics
Scores on a certain nationwide college entrance examination follow a normal distribution with a mean of 400 and a standard deviation of 100. Find the probability that a student will score over 500.

algebra
which measure will remain the same if Jarod next three quiz score are 96,93,and 93 a.mode b.range c.mean d.median

geometry
Its a if, then question. It says If I get another chance, then I will do better. And 'i get another chance is lined' what would it be? Like would it still be a hypothesis without the 'if' underlined? Would it be the argument?

physics
A roof rises 1.7 feet vertically and 13.3 feet horizontally. What is the grade of the roof in percentage

Spanish
NO its (Ella es americana.)

algebra
what is the sq root property of 2x^2=26

Physics
In 35.0 s, a pump delivers 0.574 m3 of oil into barrels on a platform 25.5 m above the intake pipe. The oil's density is 0.820 g/cm3.

math word problem
A rectangle garden is 30 ft by 40 ft. Part of the garden is removed in order to install a walkway of uniform width around it. The area of the new garden is one-half the area of the old garden. How wide is the walkway?

math
The number 33 bus arrives at the corner of Coldspring and Hillen every 15 minutes. The number 40 bus arrives at the same corner every 46 minutes. If both buses leave the corner at 9:08 am, when is the next time the buses arrive at the corner at the same time?

Algebra
Thank you.

Algebra
Divide: (20b^(3)+17b^(2)+18b+43)÷(4b+5)

Algebra
Thank you.

Algebra
3y-24/14 divided by y-8/4y

Algebra
Thank you.

Algebra
Solve for x. 4x(x-1)-5x(x)=3

english
What is the word ball in this sentence? The young boy played ball in the yard. adverb?

PARAPHRASING CONFUSION PLEASE HELP???
I need help with this and have no clue as to what I should do. I have trouble with paraphrasing. Review the following passage and paraphrase the long passage in the following box. Use the reference to create an appropriate APA-formatted, in-text citation. Additionally, include...

Algebra
Thank you very much!!

Algebra
-4^2+44x-160=0 If you graphed the above equation, would the graph open up or down? How can you tell without graphing it?

Algebra
A farmer decides to enclose a rectangular garden, using the side of a barn as one side of the rectangle. What is the maximum area that the farmer can enclose with 100 ft of fence? What should the dimensions of the garden be to this given area? The maximum area that can be ...

Algebra
The length of a rectangle is twice the width. The area is 578 yd.^2. Find the length and width.

Algebra
Thank you.

Algebra
In the community you live, you have been asked to serve on the planning committee for the Fourth of July festival. Your committee has decided to begin meeting early to avoid some of the problems experienced in previous years. Unfortunately, those problems stemmed from poor ...

finance
You have just graduated and one of your favorite courses was Financial Management. While you were in school, your grandfather died and left you $1 million. You have decided to invest the funds in a fast-food franchise and have two choices–Franchise L and Franchise S. You ...

Rati and Rates Problems
1.Write two equivalent ratios for the given ratio. a. 4/12 b. 11/33 SHOW WORK

Finance
Assume that you are the assistant to the CFO of XYZ Company. Your task is to estimate XYZ's WACC using the following data: 1. The firm's tax rate is 40%. 2. The current price of the 12% coupon, semiannual payment, non-callable bonds with 15 years to maturity is $1,153....

Statistics
Suppose the heights of women aged 20 to 29 follow approximately the N(66.7, 2.4) distribution. Also suppose men the same age have heights distributed as N(70.5, 2.2). What percent (± 0.1) of young men are shorter than average young women?

Algebra - Please HELP
During the first part of a trip a canoeist travels 49 miles at a certain speed. The canoeist travels 25 miles on the second part of the trip at a speed of 5mph slower. The total time for the trip is 5hrs. What was the speed on each part of the trip?

Algebra
The flower garden has the shape of a right triangle. 5ft of a perennial border forms the hypotenuse of the triangle, and one leg is 1ft longer than the other leg.Find the lengths of the legs.

Algebra
Thank you!

Algebra
During the first part of a trip a canoeist travels 49 miles at a certain speed. The canoeist travels 25 miles on the second part of the trip at a speed of 5mph slower. The total time for the trip is 5hrs. What was the speed on each part of the trip?

Finance
You deposit $1000 in an account that pays 8% interest compounded semiannually. After 2 years, the interest rate is increased to 8.40% compounded quarterly. What will be the value of the account after 4 years?

science virus
Influenza is an active virus. I know this because, it spreads very quickly.

physics-question 7
A baseball is thrown at an angle of 26 degrees relative to the ground at a speed of 22.1 m/s. The ball is caught 39.2327 m from the thrower. The acceleration due to gravity is 9.81 m/s2 . How high is the tallest spot in the ball’s path? Answer in units of m

physics
A spy in a speed boat is being chased down a river by government officials in a faster craft. Just as the officials’ boat pulls up next to the spy’s boat, both boats reach the edge of a 5.2 m waterfall. The spy’s speed is 15 m/s and the officials’ speed is ...

Algebra
4th of 2 and 24th of 2 both equal 2. so i'm thinking this is false, I just need confirmation.

Algebra
I did not express a question involving power. Power is expressed as follows: 4^2. I am asking a question involving radical expressions, roots, and radicands.

Algebra
radical expressions=the root of a radicand. I can't type the radical symbol. 4th power to the number 2 and 24th power to the number 2.

Algebra
Is this radical expression true or false? 28 minus 4th root of 2 equals 24th root of 2

Algebra
**radicand

Algebra
Can a radical be negative when the index is even?

Algebra
Solve. .25(250)+250/250

Algebra
If 250 specialty coffee drinks were sold at the bake sale, what would the average cost per drink be given the equation .25x+250/x?

chemistry
I still have it wrong. I have pKa = 9.25. Solved for acid and got 2.39. Then I converted to grams and 62.25. Here's my work ka = 1.0e-14/1.8e-5 = 5.56e-10. solved for pKa -log(5.56e-10) = 9.25. H-H = 9.40=9.25 + log(1.70/acid). acid = 2.39. then, 2.39 x 0.490L = 1.17 M. ...

chemistry
How many grams of NH4Cl must be added to 0.490 L of 1.70 M NH3 solution to yield a buffer solution with a pH of 9.40? Assume no volume change. Kb for NH3 = 1.8 10-5.

Algebra
The average cost per drink can be found by dividing the total cost (.25x+250=total cost) by the number of drinks sold (x). Write an equation that shows the average cost per drink.

Algebra
Add. Simplify if possible. 3/v+8/v^2

Algebra
Add. Simplify if possible. 4/vy^2+9/yv^2

Algebra
Find all the numbers for which the rational expression is undefined: -24/25v

Algebra
Add. Simplify if possible. 4/vy^2+9/yv^2

Algebra-Undefined
Find all numbers for which the rational expression is undefined: -24/25v

Algebra-Rational Equation
4/vy^2+9/v^2y

Algebra-Solve
x/x+3-3/x-3=x^2+9/x^2-9

Algebra/Time
The officejet printer can copy Lisa's dissertation in 22 min. The laserjet printer can copy the same document in 18 min. If the two machines work together, how long would they take to print the document?

Algebra-km/h
Maria bicycles 4km/h faster than Javier. In the same time that it takes Javier to bike 60km, Maria bikes 72km. How fast does each bicyclist travel?

Algebra/Math
A group of parents is going to sell specialty coffee drinks including espresso, lattes, cappuccinos and mochas. It cost $250 to rent the equipment, which is a fixed cost. Additionally, the ingredients for each drink (x) cost $0.25. Write an equation that shows the total cost ...

physics
a fire hose held near the ground shoots water at a speed of 6.5m/s at what angle should the ozzle point in order that the water land 2.5m away? why are there two different angles?

chemistry
0.15g CS2

english
okay one more to be sure I got it. May Beth and ____ help with the decorations? She can go here because it is the subject and I need a subject pronoun??

English
It is confusing me when it is at the end of the sentence... Amelia Earhart also flew nonstop across the Atlantic; the first woman to do so was (her, she). I am thinking try the sentence with one word at a time to see which makes sense.. so I am thinking she?

english
him

english
What word is the correct one and why? When Samuel P. Langley built a steam-powered airplane, both the pilot and (he, him) were sure to fly.

english
Which word fits better and why? You and (me, I) have heard the Greek myth about lcarus.

Physics
A pelican flying along a horizontal path drops a fish from a height of 4.7 m. The fish travels 8.5 m horizontally before it hits the water below. What was the pelican’s initial speed? The acceleration of gravity is 9.81 m/s2 . Answer in units of m/s

physics
A shell is fired from a gun with a muzzle velocity of 466m/s at an angle of 57.4 degrees with the horizontal. At the top of the trajectory, the shell explodes into two fragments of equal mass. One fragment, whose speed immediately after the explosion is zero, falls vertically...

statistics
The sum of the draws from a box is 440. If the average of these draws is 2.20, how many draws were there?

Algebra
You need to solve for x, so start by getting x by itself. To do that, move the 8 to the other side of the equation by subtracting it from both sides. When you do that, you get: 3x>-6 Then, to get x by itself, divide both sides by 3. So you're answer will be: x>-2

Calculus
Find dy/dx by implicit differentation. ysin(x^2)=-xsin(y^2)

math
First distribute the 5: 5(3x-2y)-(x+6y) will become (15x-10y) -(x+6y) Then, distribute the - on the (x+6y): 15x-10y-x-6y Then, just combine the x's and y's and you'll end up with: 14x-16y

Math
2(6-4d)= 25-9d plz show step by step

communication
so if I did advertisment the media is advertisment and the medium could be televsion and or newspapers making it televsion advertisment ot newspapers But what could it be perhaps for music

communication
What are some froms of medium in popular culture?

math
lopez spent 1/3 of his vacation money for travel and 2/5 of his vacation money for lodging. He spent $1100 for travel and lodging. What is the total amount of money he spent on his vacation?

math
9x+6-4x=8 ---------- 2

english
Music or television I meant

english
Music of television

english
what are some research topics about popular culture

Calculus
find f'(a) for f(x)=1/sqrt(13-7x) i got my answer to be 7 / (7(13-7x)sqrt(13-7x)) but it says i am wrong please help

Calculus
find f'(a) for f(x)=1/sqrt(13-7x) i got my answer to be 7 / (7(13-7x)sqrt(13-7x)) but it says i am wrong please help

physics
An electron travels 3.75 m in 6.41 × 10−8 s. How fast does it travel? Answer in units of cm/s

English 101
What are some interesting topic regarding Pop Culture. Any ideas for my research paper.

physics
A 2.0-N force acts horizontally on a 10-N block that is initially at rest on a horizontal surface. The coefficient of static friction between the block and the surface is 0.50. What is the magnitude of the frictional force that acts on the block

4th grade math help!
Melvin estimated 645 + 322 by adding 600 + 300. Is his estimated sum an over or under estimate? Ty

Math
Melvin estimate 645 + 322 by adding 600 + 300. Is his estimate sum an over or under estimate please? Ty

Math
i need help with my math

bio 12
you have an orginal populatonof eagles, then humans introduce new eagles in the same area. the new eagles reduce the amountof resources in its home range. what type ofdistrubtion would give the most accuarte assesment of sustainable maximum popualtion. the three type of ...

physics
Find the density in g/cm3 of a 120 cm3 piece of metal having a mass of 2 kg.

chemistry
Find the concentration of Cu+ in equilibrium with CuBr(s) and 0.10 M Br-.

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