# Posts by john

Total # Posts: 8,589

Math
Cosmic ray bombardment of the atmosphere produces neutrons, which in turn react w/ nitrogen to produce radioactive carbon-14. Radioactive carbon-14 enters all living tissue through carbon dioxide. As long as it is alive, carbon-14 is maintained in the organism at a constant ...

Physics
31 m/s 23 ° north of east

Program Design and Development
Very basic pseudo code is what we're dealing with. New to OOP and I do not understand it. I'm not asking anyone to simply solve these problems but rather help walking me through them if possible. These are not assignments, just exercises from the book that I'm ...

Program Design and Development
Design a class called SimpleCalculator using psudoecode that contains public methods named add(), subtract(). Each of the methods accepts two numeric arguments and returns a number that represents the result of the appropriate arithmetic operation. Design a sub-class of ...

Alabama
gaseous butane reacts with gaseous oxygen gas to produce gaseous carbon dioxide and gaseous water. Suppose 38.9 g of butane is mixed with 35. g of oxygen. Calculate the maximum mass of water that could be produced by the chemical reaction. Round your answer to 2 significant ...

ENGLISH
In about (500 words)write a composition ending with "when i woke up i realised that it was only a dream"

Math, Algebra (fast help would be nice)
I would have assumed that you used paper to work out the problems before entering them into the computer. I would think doing it on paper would be the only way to do these problems.

math
(8,5) The best way to find this is to draw the other 3 points on a graph and it becomes quite clear that you need (8,5)

Math
q+ 3 = d .25q + .10d = 2.75 .25q + .10(q + 3) = 2.75 The above is a substitution. If you don't like working with decimals, multiply through by 100 25q + 10(q+3) =275 35q + 10q + 30 = 275 Can you finish from here?

Math
The square root of number that is two bigger than k is twice as big as the square root of the number one less than k. What is k?

math
A vertical mast is on top of building and is positioned 6 ft from the front edge. The mast casts a shadow perpendicular to the front of the building and the tip of the shadow is 90 ft from the front of the building. At the same time, the 24 ft building casts a 64 ft shadow. ...

geometry
A vertical mast is on top of building and is positioned 6' from edge of building. The mast casts a 90' shadow from front of building. Another building 24' tall casts a shadow 64'. What is the height of the mast?

maths
if the geometric mean of two numbers x and y is 6 find the geometric mean of the four numbers x,y,9x,9y

statistics
suppose a car is driven from town A to town B from town B to town C and from town C to town D which have equal distances at average speeds 20km/hr,60km/hr and 120km/hr respectively,what is the average speed for the whole journey

statistics
explain clearly the three meaning of "statistics" contained in the statement below "you compute statistics from statistics by statistics"

Math
particle P of mass m kg is attached to two fixed points A and B by two identical model springs, each of stiffness k and natural length l . The point A is at a height / l above the point B. The particle is free to oscillate vertically under gravity. The stiffness of each spring...

maths
if the arithmetic mean of four numbers is 20 and the arithmetic mean of other six numbers is 10 then,find the arithmetic mean of all the numbers taken as one group

maths
let the harmonic mean of two numbers x and y be 9.find the harmonic mean of the four numbers x,y,2x,2y

Throughout the season, drew scored 18 touchdowns. He scored 10 in the first 6 games. How many did he score in the last 4 games? Write the equation and solve.

Chemistry
Based on the ratio of mean moles of O2/mol KClO3 what is the chemical equation for the reaction that occurred? Why? Is this conclusion in accord with the mass of the solid product that you obtained? Explain Moles of O2/mol KClO3 = 1.95x10^-2

economics
if the CPI for the year 2004 is calculated as 96.5. compared to the base year what can we say about the general price of goods and services at 2004

Math
Carol has 8 3/4 yards of material. She needs to use 1/3 of the material to make a dress. How many yards of material will she need to make the dress?

health
what are nuts

Maths
The diagram shows a tent which has a rectangular base with vertical sides of height 2m, width 6m and length 8m, surmounted by a pyramid. The vertex,v, of the pyramid is 3m above the centre of the base of the tent Calculate the area of the triangular face VEF Calculate the area...

ICT
consider an organization as a computer system and identify its components

Science - hyperthyroidism
Hello, Can someone explain to me how does negative feedback loop work with a person whose condition is hyperthyroidism? How does graves disease effect the homoeostasis of the thyroid function and its production of hormones I am reading the book but it does not make sense at all.

Electricity and Magnetism
When you apply a magnetic field to a material it is observed that the magnetic field inside decreases. What material property have you observed? a) Paramagnetism b) Diamagnetism c) Ferromagnetism

MATHEMATICS
Find the curved and total surface area of a right circular cone,of base radius 8cm and height 10cm

Information Technology
what did Microsoft do to prevent viruses like Melissa virus?

Pre-cal
Determine two positive integers such as 5 less than two times the first number is the second number. The sum of the second number and the square of the first is 115.

Maths
What is the capacity of a cylinder tank of diameter 3.5m and height 4m in litres (pie22/7)

Math
a) the center is (5,-3) and the radius is the square root of 49 = 7. (x-a)^2+(y-b)^2 = r^2 is the formula for the circle. This is why the center values are the opposite of what is in the formula above.

Math
A + S=120 6A +4S = 600 Use substitution A= 120-S 6(120-S) + 4s = 600 720 -6S + 4S = 600 720 -2S = 600 Can you finish from here?

Algebra Susie is wrong
It says to evaluate. Therefore, just put the -4 in for the x^2 and simplify. (-4)^2 - 18 simplifies 16 -18 simplifies to -2 If this is an expression there should not be an = sign. I am assuming the -10 wouldn't be there.

Calculus - Derivatives
Use implicit differentiation to find the second derivative y'' of the function given. x^2 + 5y^3 = 8

Electricity and Magnetism
Consider free protons following a circular path in a uniform magnetic field with a radius of 1m. At t =0s, the magnitude of the uniform magnetic field begins to increase at 0.001 T/s . Find the tangential acceleration of the protons .

Government
Does Japan have a stronger civil society than South Korea?

physics
idk

maths for management
suppose a retail business sells its commodity at a margin of 25% on all items purchased and sold.moreover the company used a 5% commission as saving expense and 12000 at a fixed cost.find the breakeven revenue

maths for management
suppose a retail business sells its commodity at a margin of 25% on all items purchased and sold.moreover the company used a 5% commission as saving expense and 12000 at a fixed cost.find the breakeven revenue

Math Help
Melanie would like to have \$25,706.30 in an ordinary annuity in 5 years. The annuity has a 10.8% annual interest rate, and she plans on making quarterly deposits. How much should she deposit per quarter? Would this be the way I solve the question? (1+.108/4)^5-1 [.108/4] = ....

Physics
Consider classical electron orbit with radius 53pm (picometers) that has a magnetic moment equal to sqrt(2)*?B (the Bohr magneton). What is the current of that orbiting electron in A?

math
arrange the following fractions starting with lowest 1.2/4,3/9,3/15,25/100 2.5/15,2/8,3/6 3.2/10,4/12,4/20 4.4/16,20/100 5.4/8,3/12,5/10,6/18 6.2/5,6/10,13/20,31/50 7.11/25,1/4,3/50

Math
There are 24 kids and 1152 cookies. When distributed evenly, how many cookies would each kid receive?

Pre Calculus 30
1. 6!/(2!2!) 2.(9!/(2!3!)-8!/2! 3.3x(5!/3!2!)x3 4.9!/3!4!2! 5. 3! 6!/3! 6.8!/2!x3! 7.1x(5!/3!2!)X1 8.7!/4!3!

Pre Calculus
Am I correct? Please show me how if I am wrong 1.How many 6 digit numbers can be made using each of the digits {8,8,9,5,5,6} exactly once? 6!=702 2.How many more arrangements are there from all of the letters of the word MARMALADE than there are from all of the letters of the ...

Pre Calculus 30
for number 3 why do you times both?

Pre Calculus 30
1.How many positive integers five-digit integers end with the digit 0? 9x10x10x10x? what number would represent zero 2.Using the digits {1,2,5,6,7,9} and not allowing repetition of digits, how many positive three-digit integers can be made that are larger than 500? 9x5x4 3....

Math Need Help!!
Which Number Is A Perfect Square? A. 32~~~~ B. 144 C. 1000 D. 36000

science
D)

math
IT division budget for the current year is \$300,000. they already spent 10% of the budget on equipment, 66% on salaries, 8% on training and 31/2% on supplies. How much money does division have left in its budget for the remainder of the year?

Pre Calculus 30
For number 4 will it be 8999 but times it by two since its asking integers so negative numbers count?

Pre Calculus 30
1.How many positive four-digit integers can be formed that are even?9x9x9x5=3645 2.Three differently colored six-sided dice are rolled. In how many different ways can the dice turn up? 6x6x6=216 3.How many positive integers five-digit integers start with the digit 1?1x9x9x9x9=...

Science
Which material is the densest air,water,plastic,or iron

Math
What Is the measure of an angle that is complementary to a 47 degrees angles? A. 43 degrees B 53 degrees~~~ C. 153 Degrees D. 180 Degrees

Math
Explain How To Construct A Perpendicular bisector

Math
5229

math
f(x)=ax^3+bx^2+cx+d and f(0)=-18 determine the equation of f

English
I need help on these four questions. I was sick from class one day and now I am very confused about what is happening in Romeo and Juliet. Here are the questions in need help with: 15. A foil is a character that highlights, through sharp contrast, another character's ...

Pre Calculus 30
1.How many positive three-digit integers can be made from the digits {3,4,5,6,7} if digits may be repeated? 5x4x3=60 2.In how many ways can all of the letters of the word HEXAGON be arranged if the arrangement must start with a consonant and end in a vowel? 4x3x1x2x3x4x5=1440 ...

Pre Calculus 30
I'm having a hard time understanding the fundamental counting principal and I don't even know where to start on some of the questions.Here are a few questions I'm having trouble with. 1.Andrea, Brian, Carol, David, Emmalee, Floyd, and Gloria are to stand in a line ...

Vectors
1.7 km wide. Srry

Vectors
A boat is capable of 20 km/h in still water. You wish to cross the river downstream so that the angle the boat's push makes with the bank is 50 degrees. At what angle to the bank should the boat steer if the current is 8 km/h? How long will it take to cross if the river is...

chemistry
You have 1683.8 g of a bleach solution. The percent by mass of the solute sodium hypochlorite, NaOCl, is 3.62%. How many grams of NaOCl are in the solution?

chemistry
What are the molality and mole fraction of solute in a 25.5 percent by mass aqueous solution of formic acid (HCOOH)?

chemistry
What is the molality of a solution containing 11.1 g Na2SO4 dissolved in 2269.2 g of water?

chemistry
What volume of a 3.90 M KI stock solution would you use to make 0.430 L of a 1.25 M KI solution?

chemistry
i got this one wrong

chemistry
How many grams of CaCl2 would be dissolved in 1.1 L of a 0.17 M solution of CaCl2?

math
a cyclist rides for 5 hours at a certain speed and then for 4 hours at a speed 6 km/h greater than her original speed. If he rides 294 km altogether, what was her initial speed?

Math Help
If 4 cards are drawn randomly from the standard deck of 52 cards, what is the probability that all 4 cards are red cards? How would I set this up? there are 26 red cards So I would take 26/52 and 48/52? If this is correct, would I multiply them? Thanks

Math
The diagonal of a square garden 17ft. Determain the perimeter of the garden, rounded to 3 decimal places.

Math (Algebra 2)
Ann and Tom want to establish a fund for their? grandson's college education. What lump sum must they deposit at a 9.39?% annual interest? rate, compounded annually?, in order to have ?\$20,000 in the fund at the end of 10 ?years? I cannot get the right answer.

Algebra
What is the value of n such that 2^n=4^4 x 8^8 x 16^16?

Cmax
Thanks Steve. How would I use the ln function instead of e on the calculator? It's been ahile since I took algebra. So e equals ln?

Cmax
How do I solve for Cmax= 8.5/ e(-0.257 * (1-0.5))? Also, how would I input 'e' in my calculator?

Continuity Calculus Help
Find the value of constants c and d that make the function below continuous at x = 4. f(x) = x2 ? 3x x < 4 c x = 4 d + x x > 4 c = d = 8 I got d=8, but finding c is giving me trouble.

Continuity Calculus Help
9.0/1 points | Previous Answers SSTCalc6 2.3.046.My Notes Question Part Points Submissions Used Let f(x) = 4x2 if x > 2 4x + 3 if x ? 2. Show that f is continuous from the left at x = 2, but not from the right. lim f(x) = n?2? f(2) = lim f(x) = n?2+

Physics
Car A is 12 m ahead of car B on a straight stretch of road. Car A starts from rest and accelerates away from B at 4.0 m/s2. Two seconds later B starts from rest and accelerates after A at 6.0 m/s2. How long will it take B to catch A? How far will B have travelled?

math
You find a sales receipt from a store that shows the total price as \$40, and the total amount paid including sales tax as \$42. a. Write an equation you can use to find the sales tax rate rr. An equation is 42=42= .What should the equation be?

Math
Prove that limit(z -> z_0) z^2 = z_0^2 I must show that for any positive number E that there exists a positive number delta so that whenever this is true: 0 < |z - z_0| < delta then this is true: |z^2 - z_0^2| < E

Pre-Calculus
u dot v / |v| (1.6*-2.1 + 3.3*-0.5) / sqrt(2.1^2 + 0.5^2) -2.32

Chemistry
Consider a one step reaction. Which of the following does not describe the activation energy of the process? The minimum amount of energy needed for a reaction to occur The energy difference between the starting point and the transition state The energy difference between the ...

Physics
A hollow sphere has a uniform volume charge density of 4.61 nC/m3. The inner radius is a = 14.6 cm and the outer radius is b = 43.8 cm. What is the magnitude of the electric field at 21.9 cm from the center of the sphere? What is the magnitude of the electric field at 140. cm ...

Science
Loleris is right.

Science
The doctor ordered an IV infusion of NaCl at 125 ml/hr for the next 48 hours. THe drop factor for the IV tubing is 10. 1) calculate the gtts/min Answer: 23 gtts/min 2) calculate the total amount of IV fluid the client will receive in 48 hours. I got 6000 ml.... Anyone check ...

Calculus can you please show me the step by step s
The intensity of light varies inversely as the square of the distance from its source. If two searchlights are 600 meters apart and one light is 8 times as strong as the other, where should a man cross the line between them in order to be illuminated as little as possible

Calculus
The intensity of light varies inversely as the square of the distance from its source. If two searchlights are 600 meters apart and one light is 8 times as strong as the other, where should a man cross the line between them in order to be illuminated as little as possible

Maths
0.38

chemistry
an over the counter pain reliever melts at 78degree celcius. convert this temperature to f and k

chemistry
how many fluid ounces are contained in 1qt of milk. 2.how many cups are contained in 1l of soda

chemistry
how many fluid ounces are contained in 1qt of milk how many cups are contained in 1l of soda

chemistry
a woman was told to take a dose of 1.20g of calcium daily ,how many 200mg tablets should she take^

Math
A dessert recipe calls for2 1/2 cups of milk how. Many cups of milk are needed for 8 servings?

math
An investment of 25,000 earns interest at an annual rate of 8.4% compounded continuosly a. find the instantaneous rate of change of the amount in the account after years b. find the instantaneous rate of change of the amount in the account at the time the amount is eqaul to 30...

Chemistry
Calculate deltaH for the reaction NO (g) + O (g) ----> NO2(g) given following NO + O3 ----> NO2 + O2 deltaH=-198.9 kj O3 ---> 3/2 O2 deltaH= -142 kj O2 -----> O2(g) deltaH=495

physics
A hoodlum throws a stone vertically downward with an initial speed v0 from the roof of a building, a height h above the ground. (a) How long does it take the stone to reach the ground? (b) What is the speed of the stone at impact? Give your answers in terms of the given ...

physics
A hoodlum throws a stone vertically downward with an initial speed v0 from the roof of a building, a height h above the ground. (a) How long does it take the stone to reach the ground? (b) What is the speed of the stone at impact? Give your answers in terms of the given ...

Math Help
I am trying to work this problem out. I know that the systematic counting principle is used. However, I cannot get the right answer. For the first part, I took R=2 N=6 6!/(6-2)! (Permutation). Answer: 30 choices for the Chair/Vice The second part, I took R=2 N=8 Combination ...