Tuesday
July 29, 2014

Posts by Lisa


Total # Posts: 2,968

Chemistry
Using Dimensional Analysis One mole of sillicon has a mass of 28.1 g, and one mole of oxygen has a mass of 16.0 . What is the mass of one mole of sillicon dioxide.

PHYSICS - PLEASE HELP
total momentum = m1(v1)+m2(v2)+m3(v3) total momentum = [(5)8]+[(-4)15]+[(2)3] total momentum = (40)+(-60)+(6) total momentum = (-20)+(6) = -14 Answer: A

5th grade math
Jason ate lunch at Virginia’s Diner. If his meal cost him $11.00, and he wants to leave Virginia a 15% tip, how much money should Jason leave for the total bill? A. $11.50 B. $12.00 C. $12.36 D. $12.50 E. $12.65 how do you do this?

Chemistry?HELP
Is carbon graphite or a diamond harder to break or scratch and why. You must use an explanation of molecular geometry, intermolecular and intramolecular forces to answer this question. I'm confused...

Chemistry
The fictitious compound, arrhenium fluoride ( ), reacts with itself to form a dimer with the formula Ah2F2 . The reaction is second order in AhF. The value of the rate constant is 8.591x10-3 M-1s-1. What is the initial rate of reaction in a reactor filled with AhF to a concent...

CHM
Predict whether the following bonds are ionic, covalent, or polar covalent based on the bonding atoms electronegativities: N2 The Al-O bond in Al2O3 MgO CuS

MATH
From HOME TO THE FAIR IT'S 70 MILES, I have driven about 30 miles at 40 miles per hour. how many hours would it take me to finish the remaining miles?

accounting
On September 1, 2013, Jacob Furniture Mart enters into a tentative agreement to sell the assets of its office equipment division. This division qualifies as a component of the entity according to GAAP regarding discontinued operations. The division's contribution to Jacob...

chemistry
Urbium (Ur) is an upscale element found in big cities. Its oxide (UrO2) is not very stable and decomposes readily at temperatures exceeding 66∘ C. The figure below shows how the rate of reaction varies with the concentration of UrO2 at 75∘ C. The rate r is in units...

chemistry
Normal glucose levels in the blood are from 70 to 110 mg glucose per 100 mL of blood. I the level falls too low, there can be brain damage. If a person has a glucose level of 108 mg/100 mL, what is the total mass of glucose in grams in 5.10L of blood?

algebra 1
Two vans leave town at the same time going in opposite directions. one travels at 60 miles/hr. the second travels 30 miles/hr. in how many hours will they be 180 miles apart?

chemistry
15.00 ml of NaOH is obtained in an Erlenmeyer flask. Before titrating with .2500 M HCl, the initial volume of acid in a buret is read as 2.08 ml. At the endpoint the final volume of acid in the buret is 25.20 ml. What was the concentration of NaOH?

physics
thank you very much!

physics
ah thanks, it's 10^3 kg/m^3

physics
A box with a volume V = 0.03 m^3 lies at the bottom of a lake whose water has a density of 103 kg/m^3. (a) How much force is required to lift the box, if the mass of the box is 100 kg? (b) How much force is required to lift the box, if the mass of the box is 70 kg?

maths
Let A, B and C be the sets such that A ∪ B = A ∪ C and A ∩ B = A ∩ C. Show that B = C.

Algebra
Let L= 3x and B = 2x. P = 2L + 2B 73= 2(3x)+2(2x) 73= 6x+4x 73= 10x or x = 73/10 x = 7.3 cm Now, L = 3x= 3(7.3)=21.9 cm and B = 2x= 2(7.3)=14.6 cm

math
If the key to Graceland costs $750 today and appreciates in value by 15% in one year, what will it be worth one year from today?

math
find first 4 terms of following sequence: a1=-6 abd an=2an-1+3 for n >2

math
whats the present value of 850.00 made in 10 years with a discount rate of 12%

math
so am i then 150 (1.07)^7%

math
ok now the same 8 years at 8% with a deposit of 150.00 can you please show me the calculation

square roots
Describe the Number systems used in mathematics with the use of subsets of the real number system.

math
if my input numbers are 1,2,3,4,5,6 and my output numbers are 8, 14, ?, 24,28,?...I cannot figure out the rule and the numbers where the question marks should be.

math
I am trying to figure out an input/output problem: Input Output 1 8 2 14 3 - - 24 - 28 6 -

pre-algebra
write 16/19 in decimal notation

Math
Ricky wrote the following to show that his sister's age is 6 yrs. less than 3 times his age. Explain what he did wrong. Give the correct expression Let a stand for my age My sister's age a/3-6

Stattistics
In one elementary school, 200 students are tested on the subject of Math and English. The table below shows the mean and standard deviation for each subject. Mean SD Math 67 9.58 English 78 12.45 One student’s Math score was 70 and the same individual’s English score...

chemistry
balanced equation for potassium nitrate(s)--->potassium nitrate(s)+oxygen(g)

Chemistry
If 0.10 mg Fe is diluted in a 50 mL flask, what is the concentration of the resulting solution? What volume of the resulting solution is needed to prepare 25.0 mL of a dilute sample solution with a concentration of 0.30 ppm Fe?

College Math
i'm having trouble calculating this. can someone help please? A $7,000, 4%, 120-day note, dated March 20, is discounted on July 15. Assuming a 3% discount rate, the bank discount is: a) $1.74 b) $1.77 c) $7.11 d) $17.68 e) None of these .

Valencia
2.0L of a 2.0M HCl solution is added to water so that the final volume is 6.0L

Science- chemistry
After extraction with bicarbonate in which layer is the benzoic acid?

chemistry
what mass of silver bromide will form when 25.00 mL of a 0.0675 M MgBr2 solution is combined with mL of 0.100 M AgNO3?

MATH
FAITH HAS A TRIANGULAR SANDWICH AND ONE SIDE THAT IS 4IN LONG AND ANOTHER SIDE IS 3 IN WHAT IS THE RANGE OF THE THIRD SIDE

management science
Kim Davis has decided to purchase a cellular phone, but she is unsure about which rate plan to select. The "regular" plan charges a fixed fee of $55 per month for 1,000 minutes of airtime plus $0.33 per minute for any time over 1,000 minutes. The "executive"...

chemisty
a 10.00ml diluted chloride sample required 44.89 ml of 0.01982 m abno3 to reach the fajans end point. how many moles of cl ion were present in the sample

Physics
Never mind. (30)(50)(cosine 53degrees) (1500)(.6) 900J

Physics
Push a loaded grocery cart by a distance of 50m exerting horizontal force of 30N on the cart at an angle of 53degrees, how much work would you do on the cart?

Physics
How much work did the movers do horizontally pushing a 160-kg crate 10.3m across a rough floor without acceleration, if the coefficient of friction was 0.50?

business law
The initials "L.S." at the end of a document mean?

phyiscal chemistry
Moving from solid to liquid by changing the pressure, so what happend if u decrease the pressure on a solid at constant temperature?

bus 115
How is the Web affecting the way business is conducted? Are there changes

math
jill bought 32 orange and apple slices. There were three times as many orange slices as there were apple slices. how many of each did she have

history
The capital of the Southern Song Empire was the city of Kaifeng Beijing X'ian Hangzhou Shanghai I think its Hangzhou but any help would be greatly appreciated!

Statistics
The closing price of Schnur Sporting Goods, Inc., common stock is uniformly distributed between $15 and 30 per share. What is the probability that the stock price will be: (a) More than $24? (Round your answer to 4 decimal places.) Probability (b) Less than or equal to $17? (R...

Astrophysics
Star Power and Temperature Star A and Star B Consider two stars that are the same size (they have the same diameter), but have different surface temperatures. Let’s say Star A’s temperature is 3000 K and Star B’s temperature is 4500 K. Let’s look at the rat...

calculus
Let f be the function defined by f(x)= sqrt(x), 0 <or= x <or= 4. and f(x)= 6-x, 4 < x <or= 6 a. Is f continuous at x=4? justify. b. Find the average rate of change of f(x) on the closed interval [0,6]. c. suppose the function g(x)= k sqrt(x), 0 <or= x <or= 4....

Public Administration
Explain the budget system model, its consistency with democratic theory, and the importance of data measures.

business
What data and stats do you need to know in order to identify profitable nations in which to export.

Math
Perry draws two planes, K and L, as shown. Which statement is true? Plane K and plane L contain four lines because a theorem states that a line extends on both sides of a plane. Plane K and plane L intersect along a line because a postulate states that if two planes intersect...

ashford university
At which stage of the process of film production does editing primarily take place

3rd Grade Math
There are 25 students in Mrs. Roberts 3rd grade class. There are 9 more boys than girls in the class. How many boys and girls are in Mrs. Robert's class? How can I explain this to my 8yr old in 3rd grade? I've got myself so confused in the process of trying to figure i...

math
Math word problem: There are 25 students in Mrs. Roberts 3rd grade class. There are 9 more boys than girls in the class. How many boys and girls are in Mrs. Robert's class.

probability
Thank you so much for taking the time to help me.

probability
in a health study, 18% of americans are underweight. If 4 americans are randomly selected, what is the probability that at least one will be underweight?

math
prime factorazation of 34

earth science
How do astronomers use satellites?

fortis
north island federal credit union pay 4% annual interest, compounded daily on time savings deposits. find the value after 1 year of 750 deposited in this account

math - Quadratic Factor
how to you factor -4x^2

Chemistry 011
what does Molar Mass mean?

Economic
Which economic term describes a service with a price elasticity of demand of 0.25?

Economic
It is true when industries that cannot easily alter production levels have inelastic supply? thanks,

Economic
Who controls what is sold in a free enterprise system? it is Producers Government or Consumers

6th grade math
in a pet store, 1/6 of the puppies are black and 1/4 are white. what fraction of the puppies are black or white?

ENG095
Explain what is wrong with the following sentence and make any corrections if necessary: “Neither the mouse nor the rats could find its way through the maze.”

early childhood literacy
when children do print alphabet letters,among the easiest to print are:

early childhood literacy
1.preschoolers use private speech to: 2.words are: 3.is gluing a writing skill: 4.is cutting a writing skill: 5.the first language arts skill that c hildren learn is: 6.what are words: 7.let me in said the pin.this is an example of: mr. rogers wants to improve his story tellin...

math 116
week 5: self check answers

english
Identify which one of the following sentences is missing punctuation. Please correct the error and explain why the correction is necessary. a. I woke up when the book slipped from my lap and landed on my foot. b. After the book slid from my lap and landed on my foot I realized...

arithmetic
f(x)=x^2+4x+3=

Geometry
can it be rs for the answer or what and this what i need help on this If AB = 6, ST = 8, AC = 12, A = 40°, T = 20°, then find the length of RS. please and thank u.

Chemistry
How many hydrogen bonds can an ethanol molecule form to neighboring water molecules ? Why?

Physics
With what speed relative to the rocks does the clam smash into the rocks? and With what speed relative to the gull does the clam smash into the rocks?

physics
Two cars are driving toward each other on a straight and level road in Alaska. The BMW is traveling at 115 km/h north and the VW is traveling at 54.0 km/h south, both velocities measured relative to the road. At a certain instant, the distance between the cars is 11.6 km. Appr...

Physics
A gull is flying horizontally 8.17 m above the ground at 6.35 m/s. The bird is carrying a clam in its beak and plans to crack the clamshell by dropping it on some rocks below. Ignoring air resistance, what is the horizontal distance to the rocks at the moment that the gull sho...

Chemistry
If 2579 kJ of energy reaches a square meter (m2) of the United States in one hour, how much total solar energy reaches the entire United States per hour? The entire area of the United States is 9,158,960 km2.

algebra 2
ax+bx=c solve for x

algebra 2
m=2p+2q solve for p

chemistry
0.27

Integrated Marketing Communications
Research any firm local or foreign and present a report and critique of their marketing communications

curriculum development
Language ability milestone for average young children include singing short rhymes or song at age____ and carrying on a conversation with other children or familiar grown-ups at age __. A 1;4 B.21/2;4 C.3;4 D.21/2;5 I chosed D

curriculum development
ok my answer is C

curriculum development
Katie is two years old. it is probable that she can: A. flex her leg and kick a ball. B. push against the ball,but not really kick it. C. kick a ball with a straight leg. D. kick a ball with her leg and have arm opposition. I chosed A

guidance and discipline
When Cary is not chosen to collect forks in the cafeteria, he shouts I hate you!" to his teacher, Mrs. Miller. Which on of the following responses below will help Mrs. Miller gude carey in expressing his feelings better? A. It sounds like you are really angry with me.B. I...

guidance and discipline
An appropriate related consequence for spilling milk is A.n appropriate related consequence for spilling milk is A. being sent to time out. B. replacing the milk C.wiping up the milk. D not getting milk the next day. I picked C ;

geometry
A 30-foot cable is suspended between the tops of two 20-foot poles on level ground. The lowest point of the cable is 5 feet above the ground. What is the distance between the two poles?

English
No the answers are not correct. 4. Is D Not C To call me on Saturday. I'm 100 and 50 million percent sure.

Physics
The left ventricle of the heart accelerates blood from rest to a velocity of +21.4 cm. A. If the displacement of the blood during the acceleration is +1.55 cm, determine its acceleration (in cm/s2). B. how much time does the blood take to reach its final velocity?

English
I dont really understand what this quote means ? "Fiction must stick to facts and the truer the facts the better the fiction.”

math
What is 75% of 12

Math
heheheeheheeheheheeh

lang arts
1. D 2. A 3. A 4. B 5. A

english
what is the simple predicate of these household pests get into everything?

college chemistry
4.5 liters of a solution that is 5.0% NaCl by mass (the density of the solution is 1.08g/ml)

math
Patterns3,2,6,5,15,14

math
if the measure of an angle exceeds four times the measure of its complement by 25, what is the measure of the angle?

math
The sum of 2 angles is 90. The measure of one angle is 1 1/2 times the measure of each angle

PSY 1 03
2. <11{1[1(19)19]}> All sages provide both wisdom and inspiration. Since Dasha’s speech contained wisdom and greatly inspired her audience, Dasha is a sage. Which one of the following points out the flaw in the argument above? (Points : 1) Just because Dasha is a sa...

7th Grade Science
D is incorrect because matter cannot be created nor destroyed. The correct answer is A.

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