Wednesday
August 20, 2014

Posts by Rachel


Total # Posts: 1,173

Fibonacci Numbers
I need to find f24. I know F23=28657 and f25=75025. I have figured out that F24 is 46368 using F(n)=F(n-1)+F(n-2). My problme is asking me for two values of n for which Fn=n. I do not understand what it is asking.
October 17, 2011

calculus
water is poured into a conical paper cup so that the height increases at the constant rate of 1 inch per second. if the cup is 6 inches tall and its top has a radius of 2 inches, how fast is the volume of water in the cup increasing when the height is 3 inches?
October 16, 2011

calculus
the cross section of a 5-ft long trough is an isosceles trapezoid with a 2 foot lower base, a 3-foot upper base, and an altitude of 2 feet. water is running into the trough at a rate of 1 cubic foot per minute. how fast is the water level rising when the water is 1 foot deep?
October 16, 2011

math
A ladder is resting against a wall. the foot of the ladder is 8 feet from the wall, and the top of the ladder is 19 feet from the ground. FIND THE slope of the ladder
October 16, 2011

Fibonacci Numbers
I posted the question several days ago and Mathmate helped to guide me along. I am just unsure if I do not understand what he is saying or if I did complete the problem right. I would appreciate any input. 1.618034 - -.618034 = 2.236068/sqrt 5 = 1.00000 I understand how to use...
October 15, 2011

calculus
a large ferris wheel is 100 feet in diameter and rises 10 feet off the ground. each revolution of the wheel takes 30 seconds. A) express the vertical distance "H" of the seat off the ground as a function of time "t" if t=0 corresponds to a time when the ...
October 13, 2011

Biology
What is the first step in replication?
October 12, 2011

Fibonacci Numbers: Understand one part not another
I understand how to use a calculator to write the decimal point using the golden ratio which is 1.618034 and the conjugate is -.618034. I also know that the relationship between the decimal expansions is that everything to the right of the decimal is the same except one is neg...
October 12, 2011

Check Fib. Number problem please
For any prime number p except 2 and 5, either Fp-1 or fp+1 is divisible by p. If I showed that this is true for p=7, the answer should be F8---is this correct because f8 is 21. P=11 would be divisible by 55 which is F10.
October 10, 2011

physics
is the speed of the cannon ball relative to the car or the ground??
October 10, 2011

Chemistry
A .1360 g sample of a mixture of magnesium and calcium carbonates when treated with HCL evolves 32.25 cm cubed of carbon dioxed measured dry at STP. Calculate the percent of magnesium carbonate in the mixutre.
October 4, 2011

chemistry
What is the pH of a solution prpared by mixing 50.0 ml of .200 M HCLO4 with 10.0 ml of .100 M KOH
October 4, 2011

Physics
A rope attached to an engine pulls a 240 Newton crate up an 14.7 degree ramp at a constant speed. The coefficient of kinetic friction for the surfaces of the crate and ramp is .32. What is the magnitude of the force that the rope exerts on the crate parallel to the ramp? (...
October 4, 2011

math
problem> mystery numbers: Bob is thinking of 2 numbers their sum is 26. their product is 165. what numbers is bob thinking about?
October 3, 2011

Geology
What is the defining characteristic of the troposphere? (Straight forward answers please & thank you)
October 2, 2011

Geology
A thunderstorm tends to be more severe and have a longer duration if the axis of the storm is: tilted, perpendicular to the ground, or it makes no difference. (Straight forward answers, if possible use the answer choices provided please & thank you)
October 2, 2011

Geology
How is a mid-latitude cyclone formed: thunderstorms on the west side of an occluded front, frontal systems in association with the Jet Stream, a lot of hot air, or cyclonic circulation around a sub-tropical high? (Straight forward answers, if possible use the answer choices ...
October 2, 2011

Geology
which 2 would create a low pressure at the surface? warm temp., cold temp., air moving through a terrain constriction, or air moving out of a terrain constriction. What is the main reason hail is not associated with tropical thunderstorms: lack of sufficient moisture in the ...
October 2, 2011

Geology
How is a mid-latitude cyclone formed
October 2, 2011

Geology
When will a thunderstorm tend to be more severe and have a longer duration in reference to the axis of a storm.
October 2, 2011

Geology
Winds blow whenever there are: cold temperatures, pressure inequalities in the atmosphere, or the earth rotates on its axis
October 2, 2011

Geology
When a hurricane approches a costal area the damage from the storm surge is greater if it occurs: low tide, high tide, tide makes no difference? The dew point of a prcel of air refers to: its elevation above the surface, the temp. at which condesation will occur, the pressure ...
October 2, 2011

Geology
why do fall winds always warm as they descend the lee side of a mountain
October 2, 2011

redwine
what measures does patrick henry say the colonists have already tried in their dealings with england?
September 29, 2011

Science
I have 2 questions. 1.) Is there a powder that just contains insoluble fiber. I know that Benifiber and many other products contain soluble fiber or both soluble and insoluble fiber. But for the experament I have put together i need an insoluble fiber powder ONLY! I have not ...
September 28, 2011

Math
Find dy/dx by implicit differentiation. cot(y) = 4x − 6y
September 28, 2011

calculus
Let P= (V^2)R / (R+r)^2 Calculate dP/dr, assuming that r is variable and R is constant.
September 26, 2011

Chemistry
Which of the following statements are false regarding using a solid drying agent? (select all that apply) a) Water can be present due to isolation and/or purification conditions b) A good drying agent must be soluble in organic solvent c) One type of drying agent is sodium ...
September 26, 2011

Chemistry
Which of the following statements are true regarding suction filtration? (select all that apply) a) Product should always be rinsed with cold water b) The filter flask can be held in place with your hand c) When filtering is complete you should remove the suction hose and then...
September 26, 2011

physics
A certain car is capable of accelerating at a uniform rate of .94m/s^2. What is the magnitude of the car's displacement as it accelerates uniformly from a speed of 87km/h to one of 97km/h? Answer in units of m.
September 24, 2011

physics
need help with the following question. if earth has a mass of 6.0*10^24 kg and a radius 6.4*10^6 m: a) find the change in gravitational potential energy of a meteorite of mass 150 kg as it moves from an infinite distance to the earth's surface. b) with what speed does the ...
September 24, 2011

math
so what is the opposite of a professional eater
September 22, 2011

chemistryyy
Answer the following two questions about the equivalence point for the titration of 27.8 mL of 0.235 M hypobromous acid (pKa = 8.64) with 0.214 M KOH. 1)Predict if the solution will be acidic, basic or neutral at the equivalence point. 2)Calculate the pH of the solution at the...
September 21, 2011

chemistryyy
Answer the following two questions about the equivalence point for the titration of 27.8 mL of 0.235 M hypobromous acid (pKa = 8.64) with 0.214 M KOH. 1)Predict if the solution will be acidic, basic or neutral at the equivalence point. 2)Calculate the pH of the solution at the...
September 21, 2011

CHEMISTRY
A buffer that is 0.271 M in acid, HA, and 0.150 M in the potassium salt of its conjugate base, KA, has a pH of 2.85. What is the pH of the buffer after 130. mL of 0.155 M LiOH is added to 0.650 L of this buffer? Assume that the volumes are additive.
September 21, 2011

CHEMISTRY
A buffer that is 0.271 M in acid, HA, and 0.150 M in the potassium salt of its conjugate base, KA, has a pH of 2.85. What is the pH of the buffer after 130. mL of 0.155 M LiOH is added to 0.650 L of this buffer? Assume that the volumes are additive.
September 21, 2011

Math: Different Forms of Linear Functions
y< x/2 -6 How do I make this into a table and then into ordered pairs?
September 15, 2011

Math: Different Forms of Linear Functions
The output is 6 less than one-half of the input
September 15, 2011

chemistry
What is Delta H rxn for the following chemical reaction? H2O(l) + CCl4(l)-> COCl2(g) + 2HCl(g)
September 4, 2011

math
cos(2x)
September 1, 2011

math
solve for sinx=cos2x (between 0 and 2pi)
September 1, 2011

calculus
find cosx and sinx if tanx = 4
September 1, 2011

Math
You'ree Welcomee 2nd Graderss![:
September 1, 2011

Math
7th* Hahaha The answer is onee![:
September 1, 2011

Math
Highest number minus the lowest. Which would be 5-4 You're Welcome!(; Btw I'm like a 7h graderr.:P
September 1, 2011

calculus
The side of a square is measured to be 12 inches with a possible error of ±0.02 inch in that measurement. If x is the exact length of the side of the square, express this difference as an absolute value inequality and solve. Then find the interval expressing the range ...
August 29, 2011

Bio
What is it called when b=d and r=0? A. iteroarity B. semelparity C. zero population growth D. cohort E. a survivorship curve I think it is E but I would greatly appreciate a teacher's input!
August 27, 2011

Chemistry
an atom is to an element as a compound is to a?
August 26, 2011

physical science
305
August 19, 2011

English
Thank you! It's really nice that you do this whole homework help for free. A lot of websites charge for stuff like that! I appreciate it immensely:) I'll be keeping this website in mind when I have Algebra 3-4 to keep up with:P
August 2, 2011

English
What tools are in a "writing toolbox"?
August 2, 2011

Medical Terminology
Need help identifying 15 medical terms that would be unfamiliar to non-medical persons. Also providing singular and plural forms of selected medical terms. This is a 47-year-old male who was in his usual state of health until early this evening when he developed an acute ...
August 2, 2011

Trigenometry
VERY URGENT! PLEASE HELP SOLVE! tan(x)+1=sqrt(3)+sqrt(3)cot(x)as well as sin(2x)= 2 cos^(x) 4cos2(x) = 8sin(x)cos(X)
August 1, 2011

algebra
4000
July 27, 2011

intermediate icd 9 cm coding
What are the codes for Intrauterine pregnancy, spontaneous delivery, single live born?
July 25, 2011

Med terms
dysphnea=dyspnea.....oops
July 12, 2011

Med terms
afonia=pneumonia eupnia=apnea dysphnea=dyspnes DOT=DOB ventolator=ventilator
July 12, 2011

Med terms
I am having troubles finding all 10 mistakes and need some help. Inpatient Progress Report Attending Physician: Moreover, Cindy Patient: Stephen R. Peters DOT: 03/01/19XX CHIEF COMPLAINT: This 53-year-old man visited the outpatient clinic for dyspnea and recurrent coughing. ...
July 12, 2011

physics
Physics: maximum force that can be applied to move an object? What is the maximum force F which can be exerted? Given: The friction between the block with mass 14 kg and the wedge with mass 16 kg is 0.19 . The surface between the wedge with mass 16 kg and the horizontal plane ...
June 16, 2011

Life science
True or false, the healthiest position to sleep on for the baby while you're pregnant is on your back
June 5, 2011

Life science
How many teeth does a child have and how many teeth do adults have?
June 5, 2011

Math puzzle
2•2=4, 7•3=21, 4•3=12, 3•2=6 ... 4+21=25, 25+12= 37, 37+3= 40, 40+4=44, 44+6= 50... I'm no math genius but I hope that I helped, the answer is 50.
June 5, 2011

propability
there are 40 tags numbered 1 through 40 in a bag. what is the probability that Glenn will randomly pick a multiple of 5 and than a multiple of 9 without replacing the first one?
June 1, 2011

Physics (Fill in the Blanks)
1. The last stage of a giant star is ____ 2. The path of a satellite is called ____ 3. The size of the Sun is the result of the "tug of war" between two opposing processes, nuclear fusion and ____ contraction Thanks :)
May 13, 2011

Physics
Two students are on a balcony 20.5 m above the street. One student throws a ball (ball 1) vertically downward at 11.1 m/s; at the same instant, the other student throws a ball (ball 2) vertically upward at the same speed. The second ball just misses the balcony on the way down...
May 12, 2011

Chem
Calculate the standard cell voltage, Eo, for the following reactions. Include the sign of the voltage in your answers. (a) Fe2+(aq) + Pb(s) --> Pb2+(aq) + Fe(s)
May 10, 2011

Chemistry
2 Ag+(aq) + Fe(s) --> 2 Ag(s) + Fe2+(aq) Which electrode is the anode, and which is the cathode. and In which directions do the cations and anions migrate through the solution? cations thanks
May 10, 2011

business law
Mary and Celia open a boutique, they hire independent contractors. When they are not selling Mary and Celia want the I.C's to do inventory and clean up the boutique. Mary and Celia also set the working hourse.. does these factors affect theri status as independent ...
May 9, 2011

chemistry
In the reaction 2SO2 (g) + O2 (g) 2SO3 (g), which change would cause the greatest increase in the concentration of SO3?
May 3, 2011

Brief Calculus
its supposed to be 1/v^7
May 3, 2011

Brief Calculus
Evaluate the integral. HINT [See Example 2 and 4.] (Remember to use ln |u| where appropriate.) (1/v7 + 5/v) dv
May 3, 2011

Calc
Find f(x) if f(1) = −1 and the tangent line at (x, f(x)) has slope7ex + 6. F(x)=
May 3, 2011

Calculus
no it is just as the denominator is one with the variable 4x^5 and 2x^7 not 1/25 raised to the 6th or 1/2 raised to the 7th
May 3, 2011

Calculus
Use fundamental theorem of calculus: Int(pi/2_pi) of e^(sin(q))*cos(q)dq
April 28, 2011

Chemistry
In the following reaction, how many grams of ammonia (NH3) will produce 300 grams of N2? 4NH3 + 6NO d 5N2 + 6H2O
April 27, 2011

Algebra
Explain the difference in answers between the following exponential expressions. Include the solutions? 7^2, -7^2,(-7)^2, and 7^-2
April 27, 2011

English (Grade 5)
Well I've got 8,2,9,3,1,6,10,4,7,5. Do you think this is correct?
April 24, 2011

English (Grade 5)
This is not in order. Please put the story about "The wishing well in order" 1. Today is a particularly busy day at the well. 2. This wishing well is very popular 3.It is New Years Day 4.Other People make wishes about their families. 5. For this reason the park will ...
April 24, 2011

Religion and Spirituality
What do you think is the moral of the story Tao of Forgiveness? Thank you :)
April 24, 2011

Math
determine one value of c that allows the trinomial cy^2 + 36y - 18 to be factored over the integers
April 20, 2011

Math
oh and the other rectangle is 1 by 5 ft
April 20, 2011

Math
1 by 8 is the dimensions I drew them both and divided the perimeters and then substitued starting from 1 and it worked the first time, but yeah the answer is 8
April 20, 2011

Geometry
how to you solve: the radius of circle Z is 13.5 units long. Find the length of each arc for the given angle measure. if the angle measure is 120 degrees?
April 19, 2011

Calculus
Hey, we covered limits at the beginning of the year, but I cannot remember how to do them at all. >>>what is the limit, as x approaches 2, of ((1/x )-(1/2))/(x-2)? Please go step by step!
April 18, 2011

math
a cross section of a hollow circular pipe shows that its inner diameter is 2 1/10inches and that the pipe is 3/5inch thick. what is the outside diameter
April 18, 2011

economics
Jerry will receive the following payments: 946 in year 3, 929 in year 5 and 958 in year 9. What is the purchasing power of the present value of these payments if the market interest rate is 17% per year and the inflation rate is 6% per year?
April 17, 2011

economics
Tom plans to gamble each year for the next 20 years, starting at at the end of year 1. If he loses 4.47 dollars in odd years (i.e., years 1, 3, 5, etc) and wins 7.46 dollars in even years (i.e., years 2,4, 6 etc), what will be Tom's (internal) rate of return per year from ...
April 17, 2011

economics
Consider a project with a positive rate of return. Suppose the discount factor solutions to the equation which determines the internal rate of return (ROR) of the project are given by 0.8502, 2.0207, -0.1767. What is the project's ROR?
April 17, 2011

Chem (repost)
Hydrogen and carbon dioxide react at a high temperature to give water and carbon monoxide. H2(g) + CO2(g) --> H2O(g) + CO(g) (b) Suppose 0.052 mol each of H2 and CO2 are placed in a 1.5 L container. When equilibrium is achieved at 986°C, what amounts of CO(g) and H2O(g...
April 17, 2011

Chemistry(check my work)?
An equilibrium mixture of the following reaction was found to have [COF2] = 0.255 M and [CF4] = 0.118 M at 1000°C. What is the concentration of CO2? 2 COF2(g) ---> CO2(g) + CF4(g) Keq = 2.00 at 1000°C I know I need to put the numbers in the equation so this is what ...
April 17, 2011

How many sig figs?
Thanks:)
April 17, 2011

How many sig figs?
An equilibrium mixture of the following reaction was found to have [H2] = 0.020 M and [I2] = 0.020 M at 340°C. What is the concentration of HI? H2(g) + I2(g)--> 2 HI(g) Keq = 69 at 340°C I got .166 but it said check number of sig figs so im guessing its 2 sig figs ...
April 17, 2011

chem
Sorry I am soo confussed right now O.O. is there anyway u can explain this in simplier form?
April 16, 2011

chem
ok so I did (x)(x)/(.03466)(.03466)= 1.6. I solved for x and got .0438. Do I have to do anything with this number to get the correct answer? Can you check my work? Thanks:)
April 16, 2011

chem
thanks Would you get the same answer for both parts of b?
April 16, 2011

chem
Hydrogen and carbon dioxide react at a high temperature to give water and carbon monoxide. H2(g) + CO2(g) --> H2O(g) + CO(g) (a) Laboratory measurements at 986°C show that there are 0.11 mol each of CO and H2O vapor and 0.087 mol each of H2 and CO2 at equilibrium in a 1...
April 16, 2011

Chemistry
Nevermind I got it:)
April 16, 2011

Chemistry
An equilibrium mixture of SO2, O2, and SO3 at 1000 K contains the gases at the following concentrations: [SO2] = 3.77 10-3 mol/L, [O2] = 4.30 10-3 mol/L, and [SO3] = 4.13 10-3 mol/L. Calculate the equilibrium constant, K, for the following reaction. 2 SO2(g) + O2(g) ---> 2 ...
April 16, 2011

science
I am really confused on this too. I'm pretty sure you come from Connections Academy. What I did was gon on google and search saturated and unsaturated. It should help a bit?
April 11, 2011

Chemistry (repost)
Which of the following pairs of substances, when mixed in any proportion you wish, can be used to prepare a buffer solution? 1)NaCN and NaOH 2) HCl and NaOH 3) HCN and NaOH 4)HCl and NaCN 5) NaCN and HCN is the answer 1 and 5?? chem - DrBob222, Sunday, April 10, 2011 at 1:28am...
April 10, 2011

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