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Posts by Nan

Total # Posts: 101

Math
(4,57)(3,20)(2,1)(5,?) What is the missing number?

math
Problem Page Translate this sentence into an equation. 96 is the product of Han's height and 6 . Use the variable h to represent Han's height.

Calculus
Which of the following is the general solution of the differential equation dy/dx = 2x/y? y2 = x2 + C y2 = 2x2 + C <- my answer y2 = 4x2 + C x2 − y2 = C

Calculus
The slope of the tangent line to a curve at any point (x, y) on the curve is x/y. What is the equation of the curve if (4, 1) is a point on the curve? x2 − y2 = 15 x2 + y2 = 15 x + y = 15 <- my answer xy = 15

Calculus
The temperature of a pan of hot water varies according to Newton's Law of Cooling: dT/dt=-k(T-A), where T is the water temperature, A is the room temperature, and k is a positive constant. If the water cools from 90°C to 85°C in 1 minute at a room temperature of 30...

Calculus
Find the specific solution of the differential equation dy/dx = 4y/x^2 with condition y(−4) = e. y equals negative 1 minus 4 divided by x <- my answer y equals negative 1 times e raised to the 1 over x power y equals e raised to the negative 4 over x power None of these

Calculus
The particular solution of the differential equation dy/dt=2*y for which y(0) = 60 is y = 60e2t y = 60 e0.5t y = 59 + et <- my ansswer y = 30et

Calculus
The particular solution of the differential equation dy/dt=2*y for which y(0) = 60 is y = 60e2t y = 60 e0.5t y = 59 + et y = 30et

Calculus
The slope of the tangent line to a curve at any point (x, y) on the curve is x/y. What is the equation of the curve if (4, 1) is a point on the curve? x2 − y2 = 15 x2 + y2 = 15 x + y = 15 xy = 15

Calculus
The temperature of a pan of hot water varies according to Newton's Law of Cooling: dT/dt=-k(T-A), where T is the water temperature, A is the room temperature, and k is a positive constant. If the water cools from 90°C to 85°C in 1 minute at a room temperature of 30...

Calculus
Find the specific solution of the differential equation dy/dx = 4y/x^2 with condition y(−4) = e. y equals negative 1 minus 4 divided by x y equals negative 1 times e raised to the 1 over x power y equals e raised to the negative 4 over x power None of these

Biology
Multicellular organisms use a variety of communication methods to coordinate cell function. Choose ONE of the following examples below and describe the cell-to-cell communication that occurs, and then describe the types of responses that result from this communication. ...

Biology
Define a protein kinase and explain its role in a signal transduction pathway. Then describe what can happen if an organism's cells experience abnormal protein kinase activity.

Biology
Describe the G protein receptor system and the tyrosine-kinase receptor system. Explain how these two systems are similar and how these two systems are different, in terms of structure and function please.

Calculus
Express the given integral as the limit of a Riemann sum but do not evaluate: the integral from 0 to 3 of the quantity x cubed minus 6 times x, dx.

Calculus
Use the Fundamental Theorem to evaluate the integral from 0 to 3 of the quantity x cubed minus 6 times x, dx. (Your answer must include the antiderivative.) Use a graph of the function to explain the geometric meaning of the value of the integral.

Calculus
Evaluate the Riemann sum for (x) = x3 − 6x, for 0 ≤ x ≤ 3 with six subintervals, taking the sample points, xi, to be the right endpoint of each interval. Give three decimal places in your answer and explain, using a graph of f(x), what the Riemann sum in ...

Calculus
Evaluate the Riemann sum for (x) = x3 − 6x, for 0 ≤ x ≤ 3 with six subintervals, taking the sample points, xi, to be the right endpoint of each interval. Give three decimal places in your answer.

Chemistry
Explain, in terms of collision theory, how and why a reaction’s rate changes as the reaction progresses.

Chemistry
Determine the rate law, including the values of the orders and rate law constant, for the following reaction using the experimental data provided. Q + X yields products Trial [Q] [X] Rate 1 0.12 M 0.10 M 1.5 × 10-3 M/min 2 0.24 M 0.10 M 3.0 × 10-3 M/min 3 0.12 M 0....

Chemistry
A match must be struck against an object to produce a spark to start the burning process. Once the match starts burning, it releases a large amount of energy. Describe, in detail, what the potential energy diagram would look like for the burning of a match, and explain how ...

Chemistry
How does the potential energy of the reactants compare to the potential energy of the products in an exothermic reaction, and where does the energy that is given off come from? Explain your answer in complete sentences.

Chemistry
NEVER MIND PLEASE DISREGARD THIS QUESTION

Chemistry
Which reaction did you perform in the hands-on activity? Describe the chemical combination that you investigated. Also describe any observations from the investigation, including the temperature change of the container.

Biology
Describe what you observed in the hands-on animal behavior lab. What conclusions did you draw from the data? Explain your answer.

Biology
Describe a specific type of chemical or audible communication used by animals to respond to an external stimulus and the resulting change in behavior. Explain how this type of communication may relate to natural selection within a population.

Biology
In one signaling pathway, cyclic AMP (or cAMP) acts as a second messenger in a series of reactions that result in the relaxation of smooth muscle cells in artery walls. Define cyclic AMP and describe the role and properties of a second messenger. Then explain how a medication ...

Biology
Multicellular organisms use a variety of communication methods to coordinate cell function. Choose ONE of the following examples below and describe the cell-to-cell communication that occurs, and then describe the types of responses that result from this communication. ...

Biology
Define a protein kinase and explain its role in a signal transduction pathway. Then describe what can happen if an organism's cells experience abnormal protein kinase activity.

Biology
Explain how cell membranes and their components participate in intercellular signaling. Give a specific example of cell membrane involvement in one particular type of cellular signaling.

Biology
Describe the G protein receptor system and the tyrosine-kinase receptor system. Explain how these two systems are similar and how these two systems are different, in terms of structure and function please.

Quick calc question
Find the distance, in feet, a particle travels in its first 2 seconds of travel, if it moves according to the velocity equation v(t)= 6t2 − 18t + 12 (in feet/sec). 4 5<-my answer 6 −1

Quick calc question
For an object whose velocity in ft/sec is given by v(t) = −t2 + 6, what is its displacement, in feet, on the interval t = 0 to t = 3 secs? 9.000 <- my answer −9.000 10.596 −3.00

Quick calc question
Find the average value of f(x) = 1 over x over the interval [e, 2e]. the natural logarithm of 2 over e negative 1 over 2 times e squared Ln2 <- my anser Ln3

Quick calc question
Find the velocity, v(t), for an object moving along the x-axis if the acceleration, a(t), is a(t) = 2t + sin(t) and v(0) = 4. v(t) = t2 + cos(t) + 3 v(t) = 2 + cos(t) + 1<- my answer v(t) = t2 − cos(t) + 5 v(t) = t2 + sin(t) + 4

Quick calc question
An elementary student kicks a ball straight into the air with a velocity of 16 feet/sec. If acceleration due to gravity is −32 ft/sec2, how many seconds after it leaves his foot will it take the ball to reach its highest point? Assume the position at time t = 0 is 0 feet...

Calculus
Find the area of the region bounded by the graphs of y = 2 − x2 and y = −x.Find the area of the region bounded by the graphs of y = 2 − x2 and y = −x.

Calculus
Find the area of the region bounded by the graphs of y = x, y = −x + 4, and y = 0. 1 2 4 None of these

Calculus
Find the number b such that the line y = b divides the region bounded by the curves y = x2 and y = 4 into two regions with equal area.

English
Has the cat got your_______?

Maths
A 73kg worker needs to transport concrete bricks using a trolley to the construction area via an elevator. The trolley weighs 1000kg while 5 concrete bricks weigh 330kg. If the elevator has a maximum capacity of 1500kg, how many bricks can the worker transport at one time?

Maths
A 73kg workers need to transport concrete bricks using a trolley to the construction area via an elevator. The trolley weighs 100kg while 5 concrete bricks weigh 330kg. If the elevator has a maximum capacity of 1500kg, how many bricks can the worker transport at one time?

Math payment calculation
What isrequired monthly payment for 30-years $100,000 mortgage at 12% APR. What formula?

Algebra 2
A species of bees make hexagonal, 6 sided, honeycombs.The bees begin with on hexagonal cell then make successive rings of hexagonal cells around the initial cell. Make a table of values for the number of cells in each of the first 8 rings (1st ring, 2nd ring, etc..) after the ...

Algebra 2
Is this sequence arithmetic, geometric, or neither? 3,10,31...

Algebra 2
Is this sequence arithmetic,geometric, or neither? -111,2.5,115.5

Algebra 2
The sequence is defined by a recursion formula. Write the first four terms of the sequence; a_1=0; a_n=5a_n-1 +7

Algebra 2
The sequence is defined by a recursion formula, write the first four terms of the sequence; a_1=100; a_n=1/2a_n-1 +4

Algebra 2
The sequence is defined by a recursion formula.Write the first four terms; a_1=-5; a_n=2a_n-1 +7

Algebra 2
The sequence is defined by a recursion formula. Write the first four terms of the sequence: a_1=9; a_n=3a_n-1

Algebra 2
Year: 1, 2, 3, 4, 5 Sale:.48,1.032,2.198,4.726,10.208 (in millions) -If the sales growth pattern continues, what will be the sales for ABC Company in year 12? -What will be the total sales for ABC Company for years 1 through 12? I know that this is a geometric sequence with a ...

Algebra 2
For the following sequence, determine the indicated geometric means; 180,_,_,_,_,-5.625,... I could hardly even calculate this! Anyone have a better idea?

Algebra 2
-S_16 for the series 5+20+80+...

Algebra 2
Recursion formula for a given population for each interval,n, at a time, and k is a constant called the Malthusian factor: a_n=ka_n-1(1-a_n-1) - Assuming n is measured in weeks, calculate the insect population for weeks 2, 3, and 4 if the initial population is 112, and the ...

Algebra 2
I just calculated again and got that. Thank you!

Algebra 2
Find the sum of the first 12 terms of this sequence: 9,4.5,2.25,... I believe that the pattern is dividing the term by 2,and I keep getting 7.9956 for the sum, but that is incorrect. Anyone understand this?

Algebra 2
For each sequence, write the next four terms 1. 36,12,4,4/3... I know that the pattern in that the term is divided by 3, but I have no idea how to calculate/write the next four terms.

america gov
Which of the following goods would you guess that the American colonies did not export to England?

critical thinking
I am struggling with deciding which evaluation criteria best fits for writing a critical essay on the passage written by Stephen Chapman...Legal Drugs Unlikely to Foster Nation of Zombies. I believe that this is a non-deductive argument. I was considering it to be a convergent...

Business
Assume that WilyMarketer is running an email campaign to acquire new customers. It is considering two options: Option A would use a high quality rental list of 100,000 email addresses. Direct costs under this option would be the rental list at $250/m and creative, program ...

math
The Recall Computer Company has six territories, each represented by one salesperson. After extensive planning, the company determines that each territory would be expected to achieve the following percentages of total company sales for 2008: Territory 1=27% Territory 4=12% ...

business
The Recall Computer Company has six territories, each represented by one salesperson. After extensive planning, the company determines that each territory would be expected to achieve the following percentages of total company sales for 2008: Territory 1=27% Territory 4=12% ...

BIOLOGY
Describe the processes of transcription and translation and correctly identify the anticodon for the following DNA template strand-ACG TGG GCA TGA ACG TGG. Which amino acids do these anticodon represent?

math
Please someone show me how to work this one out? Suppose Caroline is a cinephile and buys only movie tickets. Caroline deposits $3000 in a bank acct that pays an annual interest rate of 20%. You can assume that this interest rate is fixed-that is, it won’t change over ...

economics
Suppose Caroline is a cinephile and buys only movie tickets. Caroline deposits $3000 in a bank acct that pays an annual interest rate of 20%. You can assume that this interest rate is fixed-that is, it won’t change over time. At the time of her deposit, a movie ticket is ...

economics
Suppose that there are three beachfront parcels of land available for sale in Asilomar and six people who would each like to purchase one parcel. Assume that the parcels are essentially identical and that the minimum selling price of each is $600,000. The table below reflects ...

calculus
Find the volume of the solid generated by revolving the region bounded by the graphs of the equations about the x-axis. (Round your answer to three decimal places.) y = e^−x y=0 x=0 x=7 I got the answer ~10.783 Idk why it's wrong

chemistry
Which HPLC mode can you choose to separate a micture of alkanes? ( Normal-phase, reversed-phase, ion-exchange, or size-exclusion)

chemistry
Calculate the ionic strength of 100mM solution of Mg3(PO4)2 in 10 mM acetic buffer (CH3COONa)

Chemistry
The fusion of nuclei requires 1. slow moving (thermal) neutrons 2. a critical mass 3. heavy nuclei 4. plasma at extremely high temperatures I have another question that I do not have the answer in the back of my book. I need help. THank you

Chemistry
Exhibit 8-1 For the following questions, consider the equation below. Zinc will react with a solution of hydrochloric acid to produce hydrogen gas: Zn(s) + 2 HCl(aq) ® ZnCl2(s) + H2(g) Refer to Exhibit 8-1. How many moles of hydrochloric acid react with one mole of zinc? 1...

Physics
A brass trombone

Chemistry
Fermentation of carbohydrates is a source of 1. ethanol 2. MTBE 3. methanol 4. ethers I am working on self test in the book, but the answer is not in the back of the book for this. Any help??

Chemistry
How much heat is released when 10 g of steam at 100°C is cooled to 10 g of liquid water at 100°C? I am working on a practice test and the answer is not in the back of the book. Can some one help me. 1. 10 cal 2. 5400 cal 3. 800 cal 4. 6200 cal

Chemistry
Which equation does not fit the definition of oxidation? 1. Na ® Na+ + e- 2. C2H6 ® H2 + C2H4 3. C + O2 ® CO2 4. Ag+ + e- ® Ag Can some one help. I do not know which one. I am working on a practice test and there are no answers in the back of the book.

computer science 104
Create a method areaOfaTrapeziod when given a, b, and h (all doubles), will return the area (double) of a trapezoid. Use the equation pictured below In the code, i should 1. Create the prototype for the method 2. create the method 3. call it from the main()

Computer science
THIS IS C PROGRAMMING I NEED TO CREATE A METHOD! Create a method areaOfaTrapeziod when given a, b, and h (all doubles), will return the area (double) of a trapezoid. Use the equation pictured below. THANKS IN ADVANCE :)

math
What is the future, rounded to whole dollars, of $25,000 after 7 1/2 years, if money earns at an annual rate of 5.75% compounded continuosly?

math
What is the future, rounded to whole dollars, of $25,000 after 7 1/2 years, if money earns at an annual rate of 5.75% compounded continuosly?

math pre cal
Your industry currently employs 3,800,000 workers. If this labor force is growing expotentially at an annual rate of 2.3% how long will it be before the number of employees reaches 5,000,000?

math
Your industry currently employs 3,800,000 workers. If this labor force is growing expotentially at an annual rate of 2.3% how long will it be before the number of employees reaches 5,000,000?

math
What is the future, rounded to whole dollars, of $25,000 after 7 1/2 years, if money earns at an annual rate of 5.75% compounded continuosly?

business pre-cal
Find the annual rate, r that produces an effective annual yield of 6.3% when compounded continuosly.

math ratio
The ratio of the distances a driver and a 2 iron can propel a golf ball is 5 to 4. If a golfer averages a distance of 200 yards with a 2 iron, how far should she average with a driver. I get 250 yards is that right? 5/4=x/200 is ratio set-up

Chemistry
A solution with pH = 4 has 1. relatively high concentration of OH- 2. relatively low concentration of H3O+ 3. relatively high concentration of H3O+ 4. zero concentration of OH- Some of the answers people are giving me are confusing. I just need to know if it 1,2,3 or 4?

Chemistry
I am still lost? What is the answer 1, 2, 3 or 4?

Chemistry
A solution with pH = 4 has 1. relatively high concentration of OH- 2. relatively low concentration of H3O+ 3. relatively high concentration of H3O+ 4. zero concentration of OH-

physics
A father racing his son has 1/3 the kinetic energy of the son, who has 1/3 the mass of the father. The father speeds up by 1.4 m/s and then has the same kinetic energy as the son. What are the original speeds of (a) the father and (b) the son?

Algebra 2-Probability
1. What is the theoretical probability of rolling a sum less than 5 using two number cubes? a.1/6 b.1/4 c.1/2 d.3/4 2. Segments parallel to the sides are used to divide a square board 3 ft on each side into 9 equal-size smaller squares. If the board is in a level position and ...

fractions
what is 5 3/7 x 1/11 equal

Chemistry
How many liters of Chlorine at STP will react with 35L of 02 at STP given the following reaction? 2Cl2(g) + 7O2(g) - 2Cl2O7(l)

pyschology
classical an d operant conditioning both result in learning, but are quite different in that:

Psy
Complate the following chart. The first column shows the name of a research method used in psychology.In the second column, write a brief description of that research method. In the column, provide a situation when this method could be applied. Scientific method, Case study ...

4th grade
What is the correct punctuation in the following sentences. Do I need quotation marks? Sarah: I am going to the game tomorrow. Mary: Okay. Do you want to ride with me?

geography
what city is anabijd scrambled?

math
is there any number that doesn't have a reciprocal?

math
By me

MAT 116 Algebra 1A
Answer the following questions. Use Equation Editor to write mathematical expressions and equations. First, save this file to your hard drive by selecting Save As from the File menu. Click the white space below each question to maintain proper formatting. 1. Suppose you are at...

Trig
Given: cos u = 3/5; 0 < u < pi/2 cos v = 5/13; 3pi/2 < v < 2pi Find: sin (v + u) cos (v - u) tan (v + u) First compute or list the cosine and sine of both u and v. Then use the combination rules sin (v + u) = sin u cos v + cos v sin u. cos (v - u) = cos u cos v + ...

music
can you give me words that correspond to the count of a half-note and words that correspond to the count of a quarter note? half note (two beats) "one and, two and" quarter note (one beat) "one, two, three, four" Quarter Note: Sit, Pat, Lit Half Note: ...

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