# Francesca

Most popular questions and responses by Francesca
1. ## Thermal Physics

Two cars collide head on while each is travelling at 80 km/hr. Suppose all of their kinetic energy is transformed into thermal energy. What is the temperature increase of each car? [You may assume that the specific heat capacity of each car is that of

2. ## chemistry

Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.150 M HClO(aq) with 0.150 M KOH(aq). The ionization constant for HClO is 4.0x10^-8. pH before the addition of any KOH? pH after the addition of 25 mL of KOH? Please show the

3. ## Discrete Math

A factory makes automobile parts. Each part has a code consisting of a letter and three digits, such as C117, O076, or Z920. Last week the factory made 60,000 parts. Prove that there are at least three parts that have the same serial number.

4. ## CHemistry

Calculate the pH at the equivalence point for the titration of 0.140 M methylamine (CH3NH2) with 0.140 M HCl. The Kb of methylamine is 5.0× 10–4.

5. ## Science

Please suppose that the actual temperature is above 32 degrees F but the wind chill or real feel temperature is below 32 degrees F. Could water still freeze on the roadway surfaces?

6. ## Math

1.) Find the producers' surplus if the supply function is: S(q) = q^7/2+3q^5/2 + 54. Assume the supply and demand are in equilibrium at q= 25. 2.) S(q) = q^2 + 12q and D(q) = 900 - 18q - q^2 The point at which the supply and demand are equilibrium is (15,

7. ## Computing in Security (Conversion Help)

1.) Express each decimal number as an 8-bit binary number in the 2's complement form and then find the negative of the representation of that number in two’s compliment a.) +18 b) -117 Thanks for any help!

8. ## Discrete Math

Theorem: For every integer n, if x and y are positive integers with max(x, y) = n, then x = y. Basic Step: Suppose that n = 1. If max(x, y) = 1 and x and y are positive integers, we have x = 1 and y = 1. Inductive Step: Let k be a positive integer. Assume

9. ## Physics

An archer shoots an arrow horizontally at a target 14 m away. The arrow is aimed directly at the center of the target, but it hits 59 cm lower. What was the initial speed of the arrow? So, I am trying to find find v₀x. . .

10. ## Math

1.) Find the producers' surplus if the supply function is: S(q) = q^7/2+3q^5/2 + 54. Assume the supply and demand are in equilibrium at q= 25. 2.) S(q) = q^2 + 12q and D(q) = 900 - 18q - q^2 The point at which the supply and demand are equilibrium is (15,

11. ## Discrete Math

Is this correct? • Using the Principle of Inclusion-Exclusion, find the number of integers between 1 and 2000 (inclusive) that are divisible by at least one of 2, 3, 5, 7. A = {n| 1 ≤ n ≤ 2000, 2 |n} B = {n| 1 ≤ n ≤ 2000, 3 |n} C = {n| 1 ≤ n

12. ## chemistry

Data given are related to the Born-Haber cycle for HCl Calculate the amount of energy lost when the ionic species return to their molecular form. Atomization of ½H2(g)=217.6KJ/mol 1st Ionisation of ½H2(g)=1312KJ/mol Atomization of ½Cl2(g)=121 KJ/mol 1st

13. ## Discrete Math

Find f(1), f(2), and f(3) if f(n) is defined recursively by f(0) = 1 and for n = 0, 1, 2, . . . • f(n+1) = f(n) + 2 So, would it be f(n) = f(n+1) + 2? Or would I just keep it like the original and plug in 1, 2, 3. Thanks for any helpful replies.

14. ## Discrete Math

An arithmetic sequence begins, 116, 109, 102 Find the 300th term of this sequence.

15. ## Discrete Math

Solve the recurrence relation a_n = -6a_n - 1 + 7a_n-2, n ≥ 2, given a₀ = 32, a₁ = -17. This is what I have figured out so far: polynomial: x² + 6x - 7 distinct roots: 1 and -7 I do not understand how to find C₁ and C₂. How do I complete this

16. ## Discrete Math

Congruence True or False: (give reason) _ __ 2 ∈ 18 (mod 8) Can someone please help with this problem? I'm confused. . . Thanks for any helpful replies.

17. ## Finance

An income-producing property is priced at \$600,000 and is expected to generatethe following after-tax cash flows: Year 1: \$42,000; Year 2: \$44,000; Year 3:\$45,000; Year 4: \$50,000; and Year 5: \$650,000. Would an investor with arequired after-tax rate of

18. ## Math

Can someone please help me find the derivative of the following: y = (-9e^7x) / (5x+3) Thank you!

19. ## Discrete Math

Use mathematical induction to establish the following formula. n Σ i² / [(2i-1)(2i+1)] = n(n+1) / 2(2n+1) i=1 Thanks for any helpful replies :)

20. ## Social Studies

The effectiveness of Roman rule can easily be seen in the fact that the fall of Rome led to 1) political chaos and economic collapse in western Europe 2) the rapid rise of a new European empire

21. ## Accounting

Sierra Company is considering a long-term investment project called ZIP. ZIP will require an investment of \$121,200. It will have a useful life of 4 years and no salvage value. Annual revenues would increase by \$79,180, and annual expenses (excluding

Imagine that you are a system administrator for a company, and that the company operates from two locations Phoenix and Boston. Phoenix has 350 hosts and Boston has 2100. Given that the following class C IP addresses have been assigned to your company as a

23. ## Chemistry

Calculate the morality of a solution that contains a 4.0 mol of a solute dissolved in 12.0L of solution

24. ## CIS

1.) Encrypt the hexadecimal message F9E8 using the Rail Fence cipher for binary numbers with 3 Rails. [Give answer in hexadecimal encrypted message] 2.) Decrypt the hexadecimal encrypted message CDEF created by the Rail Fence cipher for binary numbers with

25. ## Discrete Math

Use mathematical induction to prove the truth of each of the following assertions for all n ≥1. n³ + 5n is divisible by 6 I really do not understand this to much. This is what I have so far: n = 1, 1³ - 5(1) = 6, which is divisible by 6 Then I really

26. ## Discrete Math

So, I uploaded the figure in photobucket, and if you type flutegirl516 in the search bar you will see it's the first photo. F:B→C, h:C→B, and G:A→C Is F°h°G defined? If so, what is its domain and range? Yes it is defined. And I thought that the

27. ## Discrete Math

f: A→B, g :B→A Is g ° f defined? If so, what is its domain and range? Any suggestions?

28. ## Discrete Math

I want to verify that this is correct: An arithmetic sequence begins, 116, 109, 102 • Determine whether -480 belongs to this sequence, if it does, what is its term number? -480 = 116 + (n - 1)(-7) n - 1 = 85.142. . . So, that means -480 does not belong

29. ## Science

What is water treatment? Is it also the same with water filtration? Please answer! Thanks

Neville Corporation, an amusement park, is considering a capital investment in a new exhibit. The exhibit would cost \$174,777 and have an estimated useful life of 9 years. It will be sold for \$69,200 at that time. (Amusement parks need to rotate exhibits

31. ## Discrete Math

Use mathematical induction to prove the truth of each of the following assertions for all n ≥1. 5^2n – 2^5n is divisible by 7 If n = 1, then 5^2(1) - 2^5(1) = -7, which is divisible by 7. For the inductive case, assume k ≥ 1, and the result is true

32. ## Discrete Math

Hi, I need help with interpreting a figure. You can find it one photobucket. First, type in flutegirl516 in the search bar and then click on the message that says: "Are you looking for the Photobucket user flutegirl516? Click here to see this user's

33. ## Discrete Math

Find g ° f f(x) = {(1, 2), (2,1), (3,1), (4, 4)} g(x) = {(1, 2), (2,4), (3, 1), (4, 3)}

34. ## social studies

what are the best desciiptions of both push and pull facors?

35. ## Math

Use the definite integral to find the area between the x-axis over the indicated interval. f(x) = 36 - x^2; [-1,13] So, what does be the area between the x-axis and f(x) equal? Thank you for any help! I'm really confused with this problem!

36. ## Math

How do I solve for negative modular arithmetic? Here is an example: -45 mod 13 = 7, but how?

37. ## Computing in Security (Conversion Help)

1.) Encrypt the hexadecimal message F9E8 using the Rail Fence cipher for binary numbers with 3 Rails. [Give answer in hexadecimal encrypted message] 2.) Decrypt the hexadecimal encrypted message CDEF created by the Rail Fence cipher for binary numbers with

38. ## Physics of materials

Gaseous nitrogen has a density of 1.17 kg/m3 and liquid nitrogen has a density of 810 kg/m3. [The relative molecular mass of nitrogen is 28.0] What is the mean volume per nitrogen molecule in each case? What is the mean separation between nitrogen

39. ## Discrete Math

isisDOTpolyDOTedu/courses/discretemath/problemsDOTpdf Link is above can you please take a look? Specifically #21 on pg. 345. [There are 900 3DN], I need help with g-h. Thank you.

40. ## Discrete Math

Can someone help? Very confused. . . John Sununus was once the governor of New Hampshire, and his name reminds one of the authors of a palindrome (a words which is spelt the same way forwards as backwards, such as SUNUNUS). How many seven-letter

41. ## Discrete Math

Solve the recurrence relation a_n = -2a_n-1 + 15a_n-2, n ≥ 2, given a₀ = 1, a₁ = -1. x² + 2x - 15, the distinct roots 3 and -5, so a_n = C₁(3^n) + C₂(-5)^n. The initial condition gives a₀ = 1 = C₁ - C₂, a₁ = -1 = 3C₁ - 5C₂. We obtain

42. ## Discrete Math

Determine the domain and range of: y = 5 – [1/ (1 + x)] So, would the domain be all real numbers except -1? And would the range be all real numbers except zero? I'm really confused. . .

43. ## Geometery

I need to know the laws of triangle inequality. i need help what is triangle in equality?

44. ## maths

on an island without squirrels some squirrels are introduced. a mathematical model of the population growth of squirrels on the island is given by the function f defined by f(x)= 1320/(1 + e^(5,1-0.66x)) where x is the time in years after the introduction

45. ## Physics

A baseball is hit off the edge of a cliff horizontally at a speed of 30 m/s. It takes the ball 3 seconds to reach the ground, with no air resistance. How high is the cliff wall?

46. ## Math

what is 18 percent of 240?

47. ## Math

how do you solve: 4=1(2)/(x-2) Thank you!

48. ## Math

Solve for x. .006x^3=8889 x = approx 114, but I don't understand how to get that answer. Can anyone help me solve? Thank you!

49. ## Accounting

The balance sheet of Burger King reports current assets of \$30,500 and current liabilities of \$15,800. Calculate the current ratio of Burger King and detemine whether it will increase or decrease as a result of the following transactions: -Paid \$2,030 cash

50. ## Math

Find the value of x: 20x ≡ 9 (mod 15)

51. ## Math

How do I solve for negative modular arithmetic? Here is an example: -45 mod 13 = 7, but how?

52. ## Discrete Math

Why use mathematical induction to get the sum of a sequence? Also, if there are any websites you can recommend that will be a help too. However, I need an explanation rather than examples. Thank you for any helpful replies.

53. ## Math

Let f(x^2/3). Find f(S) if S = {1,5,7,11}.

54. ## Discrete Math

Find the inverse of f: R→R given by f(x) = x³ – 2

55. ## Math

Can someone please calculate this: 48(-1/2)^6 The answer is 3/2, but I get 3/4. What am I dong wrong?

1. ## Math

She’s correct

posted on April 11, 2018
2. ## Science

Thank you!

posted on November 3, 2017
3. ## math

sign a pastition

posted on September 13, 2016
4. ## Physics

The given are (a) the speed of sound, which is 395 m/s, (b) the velocity of the moving source, which is 12 m/s, and (c) the frequency of the sound both cars are emitting, which is 395 Hz. Let's assume that f{o} is the frequency the observer can hear and

posted on October 19, 2015
5. ## Ecology

BYWEEE

posted on March 17, 2015
6. ## Finance

Also, how would you calculate the IRR? Thank you for any help!

posted on December 6, 2012
7. ## Math

it is a

posted on October 2, 2012
8. ## Math

Thank you!

posted on June 17, 2012
9. ## Math

1.) Find the producers' surplus if the supply function is: S(q) = q^7/2+3q^5/2 + 54. Assume the supply and demand are in equilibrium at q= 25. 2.) S(q) = q^2 + 12q and D(q) = 900 - 18q - q^2 The point at which the supply and demand are equilibrium is (15,

posted on June 15, 2012
10. ## Math

posted on June 14, 2012
11. ## Math

588 is the correct answer? But, I don't understand how to get to that number. How did you calculate that? Sorry, that may be a lot to type out

posted on June 14, 2012
12. ## Math

Thank you!

posted on June 7, 2012
13. ## Math

Thank you guys!

posted on June 3, 2012
14. ## Accounting

Any help?

posted on January 15, 2012
15. ## Math

Thanks for your help! Also, I am kind of confused about finding the value of x. Example: 9x ≡ 1 mod 10 How do I solve this?

posted on October 11, 2011
16. ## CIS

Sorry it's computing in security, so I guess that would fall under computers. . .

posted on September 16, 2011

Yea I tried doing a google search, but nothing good explaining where to start. Thnx for the reply though

posted on September 14, 2011
18. ## Discrete Math

THANK YOU! :)

posted on April 21, 2011
19. ## Discrete Math

Basically for the MPD problem I have to make it more precise.

posted on April 13, 2011
20. ## Discrete Math

Ok now I am confused again with 5:08, it seems the same as the first subpart of the problem. They can't be the same answer, for this one: How many seven-letter palindromes contain at most three different letters one of which is S? And for the MPD problem

posted on April 13, 2011
21. ## Discrete Math

Can you at all help with this? Multiple personality disorder (MPD) is a condition in which different personalities exist within one person and at various times control that person’s behavior. In a recent survey of people with MPD, it was reported that

posted on April 13, 2011
22. ## Discrete Math

Oh ok so there are 13800 that contain at most three different letters one of which is S.

posted on April 13, 2011
23. ## Discrete Math

So, how many seven-letter palindromes contain at most three different letters one of which is S? We would start out with 26^3, but I don't understand how to make sure S will be included as one of the different letters. Any suggestions? Thank you.

posted on April 13, 2011
24. ## Discrete Math

Oh okay I think I am following. . .

posted on April 13, 2011
25. ## Discrete Math

To be honest I haven't started yet, but your method sounds like a step in the right direction. . .I'll play around with it for a little and see what I get. . .If you figure out anything post. Hopefully someone who knows something will post cuz I'm lost

posted on April 12, 2011
26. ## Discrete Math

Any suggestions?

posted on April 12, 2011
27. ## Discrete Math

Okay I continued the first problem: |A ∩ B| = [2000/6] = 333 |B ∩ C| = [2000/15] = 133 |C ∩ D| = [2000/35] = 57 |A ∩ D| = [2000/14] = 142 |A ∩ B ∩ C ∩ D| = [2000/210] = 9 1000 + 666 + 400 + 285 - 333 - 133 - 57 - 142 + 9 = 1695

posted on April 12, 2011
28. ## Discrete Math

Hey thanks a lot for help!

posted on April 6, 2011
29. ## Discrete Math

Well a_1 = 37 not 31

posted on April 6, 2011
30. ## Discrete Math

So, going back to the previous 9:05. The solution is a_n = 40(1)^n - 3(1)^n, is this correct or way off?

posted on April 6, 2011
31. ## Discrete Math

How about this: Solve the recurrence relation a_n+1 = -8a_n – 16a_n - 1, n ≥ 1, given a₀ = 5, a₁ = 17. Characteristic polynomial is: x^2 + 8x + 16 with distinct roots -4. Since the roots are equal a0 = 5 = C1(-4)^0 + C2(0)(-4)^0 making C1 = 5,

posted on April 6, 2011
32. ## Discrete Math

So the characteristic roots are 1?

posted on April 6, 2011
33. ## Discrete Math

Idk what happened at 7:24 I think my computer had a glitch or something and it reposted. This one is throwing me for a loop: Solve the recurrence relation a_n = 2a_n - 1 – a_n -2, n ≥ 2, given a₀ = 40, a₁ = 37. Characteristic polynomial: x^2 - 2 +

posted on April 6, 2011
34. ## Discrete Math

Oh I feel dumb. . . Ok so now a_n = C_1(1)^n + C_2(-6)^n a0 = C_1 + C_2 = 5 (1) a1 = C_1 - 6C_2 = 19 (2) So to find C1 I eliminated it by 6(1) + (2)

posted on April 5, 2011
35. ## Discrete Math

Thank you so much for your help! I think I am getting the hang of it better. Can you please check: Solve the recurrence relation a_n = -5a_n - 1 + 6a_n - 2, n ≥ 2, given a₀ = 5, a₁ = 19. characteristic polynomial is x^2 + 5x - 6 it has the distinct

posted on April 5, 2011
36. ## Discrete Math

Oops posted twice. . .Sorry

posted on April 5, 2011
37. ## Discrete Math

If you don't mind can you help with this problem? Solve the recurrence relation an+1 = 7an – 10an - 1, n ≥ 2, given a₁ = 10, a₂ = 29. The characteristic polynomial is x^2 - 7 + 10 with characteristic roots 2 and 5. Once again I get confused when I

posted on April 5, 2011
38. ## Discrete Math

Sorry I still don't get it. Can someone please explain?

posted on April 5, 2011
39. ## Discrete Math

REVISED QUESTION: Why use mathematical induction to prove the sum of a sequence is valid?

posted on April 2, 2011
40. ## Math

So, this is how far I got. . .I getting weird numbers. . . -3072(1 - (-1/2)⁹) ------------------- = 1 - (-1/2)

posted on March 29, 2011
41. ## Math

Thank you for responding. Hmm... IDK. . .I'll have to ask if that's a typo on the other end. Hey do you mind seeing if this is correct, and helping with the second part? Consider the geometric sequence that begins -3072 and common ratio –1/2. Find the

posted on March 29, 2011
42. ## Discrete Math

Thank you!

posted on March 29, 2011
43. ## Discrete Math

OK thank you!

posted on March 29, 2011
44. ## Discrete Math

Yes, they both follow the same recursive definition. I was just trying the second part on my own to see if I understand. Sorry about the misunderstanding. . .

posted on March 26, 2011
45. ## Discrete Math

f(n) is defined recursively by f(0) = 1 and for n = 0, 1, 2, . . . Find f(1), f(2), f(3)

posted on March 26, 2011