Posts by kelly

Total # Posts: 1,763

Chemistry
Thank you :D

Chemistry
A concentration of PCL5(g),4,0 mol/L, verifies that the process PCl5(g) = PCl3(g) + Cl2(g) is achieved with a degree of balance of 20% Calculate the equilibrium of the reaction constant

Test taking Stratagies (2 questions) help me plz
1.B 2.C correct!! Thanks

Chemistry
When iron reacts with copper (2) chloride, one of two possible reactions take place: Fe(s) + CuCl2(aq) to FeCl2(aq)+Cu(s) OR 2Fe(s) + 3Cucl2(aq) to 2FeCl3(aq) + 3Cu(s)... What charge does the iron atom have carry in each of the two possible products FeCl2 vs. FeCl3.

math(epidemiology)
Thank you for your help Steve, I used that equation and got 810py but I assumed my answer was wrong because I got such a big number.

math(epidemiology)
A population of 100 healthy men was followed for the development of prostate cancer. After being followed for 5 years, 20 men developed prostate cancer. Ten other men were followed for 1 year and then were lost to follow-up. The remaining men who never developed the disease ...

Math
Is 4000 cups < 400 qt? Here is my answer 400 quarts = 1600 cups.

college question
It says each academic year, but I'm not sure if it means at the end of the first semester or second

college question
Hello, I have a question about scholarships in college. I know you need to maintain a certain gpa to keep a scholarship, but do you need to keep that gpa at the end of each semester, or at the end of each academic year?

math
Given that x+2y=4,determine the minimum value of x^2+xy-y^2.

Science
I have a picture of a boat sailing over a wave. I have arrow A at the front of the boat going down to the ocean floor and there's the boat at the bottom, which is marked B, the arrow then starts back up to the back of the boat and is labeled C. They want to know what is ...

Chemistry
150 g of water at 80 degree Celsius is cooled to 50 degree Celsius how much heat is lost bye the water

Math
Mr Lopez owns a home that sits on 7/8 of an acre. He has decided to plow up 1/4 of the property to create a garden. What fraction of an acre will he plow up?

Math
Jasmin needs 3/8 yard of fabric for each stripe of a striped quilt she is making. There are 14 stripes on the quilt. How many yards of fabric does Jasmin need?

physics
what is the acceleration of a car going 25m/s on a cloverleaf with a radius of 45 m?

Physics
A car accelerates from rest with a uniform acceleration of 1.7m/s for 10 seconds, its acceleration then reduces by 0.3m/s for 20 seconds of the motion, it then maintains the speed attained for another 20 seconds after which it decelerates to rest within 10 seconds. Draw the ...

FINANCE
WHAT IS THE VALUE OF A \$100 PAR PREFERRED STOCK THAT MUST BE RETIRED AFTER 10 YEARS IF IT PAYS A DIVIDEND OF \$5 ANNUALLY AND THE INVESTOR REQUIRES A 6 PERCENT RATE OF RETURN

Math
I need help please: Express in symbols:"Six decreased by the product of a number and six is twenty."

math
msrcus wants to buy 5 baseball cards. he has \$35 what is the most each card will cost? write inequality to solve

science
what is the main difference between lava and magma?

Physics
Determine the stopping distances for a car with an initial speed of 93 km/h & human reaction time of 0.80 s, for an acceleration a=−4.0m/s2.?

Math
The answer is B. This is because when u subtract 4y to get it on the other side it cancels with the other 4y giving u 0=-11 which is an incorrect statement. for C) u get 14z= -11 and z is =/-11/14

Math
subtract 2 from the right side to get 5x=6x+9 then subtract 6x to get -1x=9. divide by 1 to get x=-9. this make the equation true. Therefore it is open.

Science Urgent😖😖😖
I would say it is C

What is the break even in units? Bottle, Label and Production (direct material and labor) = \$9.12 per 12 oz. can Advertising & promotion (fixed) = \$218,000 Company Overhead (fixed) = \$354,000 Formula I'm using: Breakeven in units (BEU)= total fixed cost / (unit price –...

Mathmatics
A sc tourists bureau survey showed that 75 % of those who seek information about the state actually come to visit . The office received 8 requests for information. What is the probability that probability that 4 to 6 inclusive of the people will visit sc?

Calculus
I've done everything I can think of to solve this, but I have no idea. Find the derivative: y = sq rt{11x + sqrt[11x + sqrt(11x)]}

Calculus
A mass on a spring vibrates horizontally on a smooth level surface (see the figure). Its equation of motion is x(t) = 8 sin t, where t is in seconds and x is in centimeters. The first part of the question is to find the velocity and acceleration equations, which I got to be: v...

Does the sentences below need to be cited? Why or why not? Bill Gates is the founder of Microsoft. Students who studied two hours a day did 25% better in the final exam.

Calculus
The equation of motion of a particle is s = t3 − 12t, where s is in meters and t is in seconds. For the velocity function, I got v(t)=3t^2-12 and for acceleration, a(t)=6t. The final question is: Find the acceleration when the velocity is 0. How do I do that?

Calculus
Find the limit as x approaches infinity. sqrt(81x^2 + x)− 9x. I've worked this two different ways and have gotten 0 and 1/9, neither of which is the right answer according to the homework system??

Calculus
I misread the question!! I was thinking that setting it equal to 0 would be something completely different. Thank you so much!

Calculus
If a rock is thrown upward on the planet Mars with a velocity of 19 m/s, its height (in meters) after t seconds is given by H = 19t − 1.86t^2. When will the rock hit the surface?

Algebra
Find the domain of the function. (Write your answer using interval notation.) sqrt(x)/ (4x^2 + 3x − 1) If you set the bottom equal to zero, I got that x can't be -1 or 1/4. But I'm not sure if that's right, or how to write the answer in interval notation.

Algebra
Find the domain of the function. Write in interval notation. sqrt(x^2 − 64). For the answer, I got (-infinity, -8)u(8, infinity), but that's wrong, and I'm not sure what else to try?

Calculus
If a ball is thrown into the air with a velocity of 34 ft/s, its height (in feet) after t seconds is given by y = 34t − 16t^2. Find the velocity when t = 1.

Calculus
If a ball is thrown into the air with a velocity of 40 ft/s, its height in feet t seconds later is given by y = 40t − 16t^2. Find the average velocity for the time period beginning when t = 2 and lasting for each of the following. 1) 0.5 seconds.

Calculus (limits)
The question is to "state the value of each quantity, if it exists." We are given a piecewise function that is graphed, and no equation. What does it mean when we're asked to find f(2)?

Math
A rock is thrown upward with a velocity of 12 meters per sec from the top of a 25 meter high cliff and it misses on it's way back down. When will the rock be 3 meters from water

Computer
all correct!! thank you))

Algebra-domain
I had to find the domain of a function, and my answer is that x is all real numbers except -5 and 6. How do I write that in interval notation?

math
Factor the expression: x^3-4x^2-4x+16. I ended up getting x^3-4(x^2+x-4), but can I take it farther than that?

Algebra
I have another one What is the value of 42-2(3x5+1)? I thought you worked the parentheses first which would be 16, then subtract 42 from 2 and you get 39, you would then multiply 16x39 and you would get 624. But the answers I have to choose from are 8, 1, -16 and -21. What am ...

Algebra
Which equation represents "fifteen more than r is sixty-one? a. r + 61 = 15 b. r + 15 = 61 c. r - 15 = 61 d. r + 61 = 15 I think its b or c because b is 46 and c is 76

Geometry
Help! I don't understand this problem Find the angle of rotation that maps point P (1,0) on to P'. What are the x and y coordinates of point P' to the nearest thousandths? Determine a translation rule that maps point P onto P'.

math help
-3.68

Language Arts
What is the most important element of the plot of Lord of the Rings? a) the elves sailing away on ships b) Galadriel's gifts of magic c) the journey to destroy the ring or d) the journey to Rivendell. I think it is C) the journey to destroy the ring.

physics
500n and 100n

Finance
If a firm buys on trade credit terms of 3/10, net 50 and decides to forgo the trade credit discount and pay on the net day, what is annualized cost of forgoing the discount (assume a 360-day year)? The annualized cost of the trade credit terms of 3/10, net 50 is ___%

math
**Problem 3: Create a linear function (y=mx+b) and graph the line for the following set of data. x | y 2 | 1 4 | 2 6 | 3 First, use the slope formula to find slope: (y2-y1)/(x2-x1) Then, put the slope (m), a 'y' point, and matching 'x' point into the formula y=...

Science
It would actually be 5 C

English
Where does the comma go in these sentences? 1. Usually castles sat on a hilltop, and had high stone walls. 2. Loo at this picture of a castle Cate.

Redox Reaction
In an acidic solution, manganese(II) ion is oxidized to permanganate ion by bismuthate ion, BiO3-. In the reaction, BiO3- is reduced to Bi3+. How many milligrams of NaBiO3 are needed to oxidize the manganese in 30.2 mg of manganese(II) sulfate?

Stream Physics Hydrology - HELP!!!!
1a) An aqueous solution containing 35 kg of endosuflan insecticide is accidentally released into a small stream. The stream dimensions are 17.5 meters wide and 1.15 meters deep. The stream velocity is 1.1 m/s. The stream channel drops 24m over a distance of 10 km. Endosuflan ...

Science
Which chemical equation shows that no atoms are lost during a chemical reaction? A. 8Fe+s8-->Fe5 B. 8Fe+8S8--> 8FeS C. Fe+8S8--->FeS D. 8Fe+S8--->8FeS Is the answer A?

times
6×5= 30

History
i need help with this to please someone help me!

Math
Alicia has a flat platter shaped like a square with a semicircle of diameter 10 inches on each edge, as pictured. What is the number of inches in the side length of the smallest square ABCD that can contain the platter? I drew a diagram so far, but I don't know what to do ...

Chemistry
What is the concentration of arsenate ions in 3.5 M solution of arsenic acid? The acid-dissociation constants of H3AsO4 are: Ka1 = 5.0 x 10-3 Ka2 = 9.3 x 10-8 Ka3 = 3.0 x 10-12 I can't figure out how to set up the question

marketing research and method
Topic: Measure the various factors that influence consumption of fast food among uni. students

periodic functions(math)
A vessel is crossing a channel. The depth of the water(measured in metres) varies with time and is represented by the following equation: d(t)=2.5sin(0.523t)+2.9 a. create a graph showing the depth of the water over 24 hours. b. what is the period of this function and what ...

Spanish 1
I am not really understanding how to do some of these. Need some guidance. Thanks!! Los verbos que terminan en -car, -gar y -zar What is special about the following verbs? Complete each of the sentences with the correct preterit form of the logical verb from the word bank. ...

math
The probability that Ryan chooses Spanish is 0.86 and the probability that Riley chooses Spanish is 0.73. State the probability that: a. they both chose Spanish b neither of them choose Spanish c. only one of them chooses Spanish d. at least one of them chooses Spanish

math
A boat is travelling south at a rate of 18 km/h. A man walks across the deck from east to west at a rate of 16 km/h. Find the magnitude and direction of his velocity.

Math
A ship leaves port and sails northwest for 2 hours, and then sails N35degreesE for three hours. If it does not change speed, what direction must the ship sail to return directly to port? How long will this return trip take?

Physical science
i push a 500n box up an inclined plane that is 4 m long and 1.2 m high. what force is applied to push the box up the ramp?

Language arts
for my first answer mine was B sometimes they mix them up but the answer is - stage directions and dialogue that advances the action!

Biochemistry
Suppose that a mutant enzyme binds a substrate 100 times as tightly as does the native enzyme. What is the effect of this mutation on catalytic rate if the binding of the transition state is unaffected?

science
A marathon race is 26.22 miles. How many kilometers do the runners run?

trig
From post C, An airplane and a helicopter travel to different islands.The plane travels.415 km N 60degrees45minutes E to island A. and the helicopter travels to island B at S 19degrees5minutes E for 120 km. what is the distance between tthe two island

Math
Hi! My teacher told my class that the answer to this question is "1-sin x/cosx" but she wants us to figure out why. I tried solving it but I didn't end up with the answer given. Can someone help me? Thank you! Problem: cos x/1+sinx

Math
How would you solve this problem? cos x/1+sinx

Physics
A watermelon seed has the following coordinates: x = -8.7 m, y = 1.6 m, and z = 0 m. Find its position vector as (a) a magnitude and (b) an angle relative to the positive direction of the x axis. If the seed is moved to the xyz coordinates ( 3.4 m, 0 m, 0 m), what is its ...

English
8 Sentences, packed with descriptions, details, and examples. A verbal video of your room. i am trying to write about my daughters room. need help. my daughters room has a wide closet filled with clothes. frozen pink carpet in front of her white bed. medium oak brown wooded ...

physics
An athlete performing a long jump leaves the ground at a 27.1∘ angle and lands 7.72m away 1.What was the takeoff speed? 2.If this speed were increased by just 5.0%, how much longer would the jump be?

physics- vectors
In the sum Vector A plus Vector B equals vector C, vector A has a magnitude of 11.6 m and is angled 36.5° counterclockwise from the +x direction, and vector C has a magnitude of 14.0 m and is angled 17.1° counterclockwise from the -x direction. What are (a) the ...

art

Physics
A dog running in an open field has components of velocity vx = 3.0m/s and vy = -1.1m/s at time t1 = 11.7s . For the time interval from t1 = 11.7s to t2 = 22.2s , the average acceleration of the dog has magnitude 0.55m/s2 and direction 34.5∘ measured from the +x−...

My son has to solve equations with mixed numbers in them. we are in dispute about the problem below: 6 3/8 = t - 4 3/4 - 2 1/16 I solved it by adding 2 1/16 to both sides, then adding 4 3/4 to both sides. My answer was 13. My son solved it by subtracting he mixed numbers on ...

Math
A 13.5 gallon tank is 4/5 full. How many gallons will it take to fill the tank?

English
NEVERMIND. What I mean by giving examples is I have to explain what he means by each of 1 a kind of measles of the spirit, 2 a mumps of the psyche, 3 a disfiguring chicken pox of the soul. I KNOW THAT THEY ARE ALLLL personification. ah thank you.. I can tell that you are ...

English
Because I didn't want to give examples for all three lines. I can do that however. and RHYTHM & RHYME, see i don't know..?

English
*then I have to

English
For personification I used "a kind of measles of the spirit" For metaphor I used "But now when I fall upon the sidewalks of life, I skin my knees" Then I explained them, now I just need one more and the I have to explain how he used the figurative language ...

English
The whole idea of it makes me feel like I'm coming down with something, something worse than any stomach ache or the headaches I get from reading in bad light-- a kind of measles of the spirit, a mumps of the psyche, a disfiguring chicken pox of the soul. You tell me it is...

CAL
Consider the function y = 3x5 – 25x3 + 60x + 1. Find the absolute maximum value of y on the interval [0, 3]. What do you get I got -322, but I'm not 100% on how to find the absolute maximum.. so is that right?

marketing
1.Which option did you choose for Our Town Photography? What rationale did you use to select the option you chose? I went with the second option Joe's proposal

Fandango Furniture Manufacturing, Inc., has 40 employees on the assembly line, each with gross earnings of \$325 per week. a. What are the total social security and Medicare taxes that should be withheld from the employees' paychecks each week? Social security: \$806 ...

English
Astronauts are learned, taught to survive in space. I think learned? ?

physics
A 0.59 kg rubber ball has a speed of 1.50 m/s at point A and kinetic energy of 7.0 J at point B. (a) Determine the ball's kinetic energy at A Correct: Your answer is correct. J (b) Determine the ball's speed at B

physics
A 58.0 kg pole vaulter running at 8.9 m/s vaults over the bar. If the vaulter's horizontal component of velocity over the bar is 1.0 m/s and air resistance is disregarded, how high was the jump?

Chemistry
Given cell Cd | CdCl2 (0.55M) || NaBrO3 (0.34M), NaBr (0.12M), pH=1.20 | Pt 1. How many electrons are transferred? 2. What is E° for the cell? 3. What is E for the cell?

physics
A simple harmonic oscillator consists of a block of mass 1.20 kg attached to a spring of spring constant 190 N/m. When t = 1.80 s, the position and velocity of the block are x = 0.124 m and v = 3.190 m/s. (a) What is the amplitude of the oscillations? What were the (b) ...

Microsoft Excel
The order of precedence is very important when building formulas in Excel. Which of the following formulas will produce 778 as the result? A. =(25*(27/9)+5+309)*2 B.=25*((27/9+5)+309*2) C.=25*(27/9+5)+309*2 D. =25*27/9+5+309*2 Even understanding the basics of Excel was ...

Biology*STUCK*
A group of students was asked to list some of the similarities and differences between prokaryotic cells and eukaryotic cells. They created the table shown above. The students made a mistake in creating their table. Which statement best describes their mistake? a) Both ...

Math Help