Francesca
Most popular questions and responses by Francesca
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
asked on May 20, 2011 
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
asked on March 10, 2015 
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.
asked on April 20, 2011 
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.
asked on March 10, 2015 
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?
asked on March 8, 2019 
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,
asked on June 14, 2012 
Computing in Security (Conversion Help)
1.) Express each decimal number as an 8bit 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!
asked on September 8, 2011 
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
asked on March 25, 2011 
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. . .
asked on February 16, 2011 
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,
asked on June 15, 2012 
Discrete Math
Is this correct? • Using the Principle of InclusionExclusion, 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
asked on April 12, 2011 
chemistry
Data given are related to the BornHaber 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
asked on March 28, 2012 
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.
asked on March 26, 2011 
Discrete Math
An arithmetic sequence begins, 116, 109, 102 Find the 300th term of this sequence.
asked on March 28, 2011 
Discrete Math
Solve the recurrence relation a_n = 6a_n  1 + 7a_n2, 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
asked on April 5, 2011 
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.
asked on March 14, 2011 
Finance
An incomeproducing property is priced at $600,000 and is expected to generatethe following aftertax 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 aftertax rate of
asked on December 6, 2012 
Math
Can someone please help me find the derivative of the following: y = (9e^7x) / (5x+3) Thank you!
asked on June 3, 2012 
Discrete Math
Use mathematical induction to establish the following formula. n Σ i² / [(2i1)(2i+1)] = n(n+1) / 2(2n+1) i=1 Thanks for any helpful replies :)
asked on March 22, 2011 
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
asked on January 10, 2009 
Accounting
Sierra Company is considering a longterm 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
asked on July 15, 2012 
IP address assignment
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
asked on September 14, 2011 
Chemistry
Calculate the morality of a solution that contains a 4.0 mol of a solute dissolved in 12.0L of solution
asked on March 4, 2013 
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
asked on September 15, 2011 
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
asked on March 21, 2011 
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
asked on February 19, 2011 
Discrete Math
f: A→B, g :B→A Is g ° f defined? If so, what is its domain and range? Any suggestions?
asked on February 17, 2011 
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
asked on March 29, 2011 
Science
What is water treatment? Is it also the same with water filtration? Please answer! Thanks
asked on November 3, 2017 
Business Finance
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
asked on July 3, 2012 
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
asked on March 23, 2011 
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
asked on February 22, 2011 
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)}
asked on February 15, 2011 
social studies
what are the best desciiptions of both push and pull facors?
asked on January 19, 2010 
Math
Use the definite integral to find the area between the xaxis over the indicated interval. f(x) = 36  x^2; [1,13] So, what does be the area between the xaxis and f(x) equal? Thank you for any help! I'm really confused with this problem!
asked on June 14, 2012 
Math
How do I solve for negative modular arithmetic? Here is an example: 45 mod 13 = 7, but how?
asked on October 10, 2011 
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
asked on September 18, 2011 
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
asked on May 18, 2011 
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 gh. Thank you.
asked on April 19, 2011 
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 sevenletter
asked on April 12, 2011 
Discrete Math
Solve the recurrence relation a_n = 2a_n1 + 15a_n2, 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
asked on April 5, 2011 
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. . .
asked on February 15, 2011 
Geometery
I need to know the laws of triangle inequality. i need help what is triangle in equality?
asked on January 6, 2010 
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^(5,10.66x)) where x is the time in years after the introduction
asked on November 8, 2017 
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?
asked on October 12, 2015 
Math
what is 18 percent of 240?
asked on October 2, 2012 
Math
how do you solve: 4=1(2)/(x2) Thank you!
asked on June 17, 2012 
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!
asked on June 7, 2012 
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
asked on January 13, 2012 
Math
Find the value of x: 20x ≡ 9 (mod 15)
asked on October 11, 2011 
Math
How do I solve for negative modular arithmetic? Here is an example: 45 mod 13 = 7, but how?
asked on October 10, 2011 
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.
asked on April 2, 2011 
Math
Let f(x^2/3). Find f(S) if S = {1,5,7,11}.
asked on February 24, 2011 
Discrete Math
Find the inverse of f: R→R given by f(x) = x³ – 2
asked on February 15, 2011 
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?
asked on March 29, 2011

Math
She’s correct
posted on April 11, 2018 
Science
Thank you!
posted on November 3, 2017 
math
sign a pastition
posted on September 13, 2016 
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 
Ecology
BYWEEE
posted on March 17, 2015 
Finance
Also, how would you calculate the IRR? Thank you for any help!
posted on December 6, 2012 
Math
it is a
posted on October 2, 2012 
Math
Thank you!
posted on June 17, 2012 
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 
Math
588 is the correct answer!**
posted on June 14, 2012 
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 
Math
Thank you!
posted on June 7, 2012 
Math
Thank you guys!
posted on June 3, 2012 
Accounting
Any help?
posted on January 15, 2012 
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 
CIS
Sorry it's computing in security, so I guess that would fall under computers. . .
posted on September 16, 2011 
IP address assignment
Yea I tried doing a google search, but nothing good explaining where to start. Thnx for the reply though
posted on September 14, 2011 
Discrete Math
THANK YOU! :)
posted on April 21, 2011 
Discrete Math
Basically for the MPD problem I have to make it more precise.
posted on April 13, 2011 
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 sevenletter palindromes contain at most three different letters one of which is S? And for the MPD problem
posted on April 13, 2011 
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 
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 
Discrete Math
So, how many sevenletter 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 
Discrete Math
Oh okay I think I am following. . .
posted on April 13, 2011 
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 
Discrete Math
Any suggestions?
posted on April 12, 2011 
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 
Discrete Math
Hey thanks a lot for help!
posted on April 6, 2011 
Discrete Math
Well a_1 = 37 not 31
posted on April 6, 2011 
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 
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 
Discrete Math
So the characteristic roots are 1?
posted on April 6, 2011 
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 
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 
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 
Discrete Math
Oops posted twice. . .Sorry
posted on April 5, 2011 
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 
Discrete Math
Sorry I still don't get it. Can someone please explain?
posted on April 5, 2011 
Discrete Math
REVISED QUESTION: Why use mathematical induction to prove the sum of a sequence is valid?
posted on April 2, 2011 
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 
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 
Discrete Math
Thank you!
posted on March 29, 2011 
Discrete Math
OK thank you!
posted on March 29, 2011 
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 
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