Thursday
August 21, 2014

Posts by anonymous


Total # Posts: 69,766

calculus
Suppose strontium-90 decays at a rate of 2 percent per year. (a) Write the fraction P of strontium remaining, as function of t, measured in years. (Assume that at time t=0 there is 100 % remaining.) Answer: P(t) = (b) Estimate the half-life of strontium. Answer: Hint: Use your...
June 27, 2014

Math
a) In order to express the function y = 1311 x − 4, as a composition of two functions the outer of which is an exponential function, we would let u be equal to the inner function, u = , and then write y as a function of u, as follows: y = . (b) In order to express the ...
June 27, 2014

Math
Redo problem 13 from section 1.8 of your textbook (page 62), but use the functions in the questions below rather than the functions in your textbook: (a) In order to express the function y = 1311 x − 4, as a composition of two functions the outer of which is an ...
June 27, 2014

Math
Choice 1: Payments of $ 2600 now, $ 3200 a year from now, and $ 3880 two years from now. Choice 2: Three yearly payments of $ 3200 starting now. Modification: Interest is compounded continuously instead of annually. (a) If the interest rate on savings were 4.86 %, which would ...
June 27, 2014

Math
A culture of bacteria grows exponentially. It doubles in size every 81 hours. How long will it take to triple from its original size? Answer: hours.
June 27, 2014

Math
Suppose strontium-90 decays at a rate of 2 percent per year. (a) Write the fraction P of strontium remaining, as function of t, measured in years. (Assume that at time t=0 there is 100 % remaining.) Answer: P(t) = (b) Estimate the half-life of strontium. Answer: Hint: Use your...
June 27, 2014

English
the only car for him is one of those new GTO's.
June 27, 2014

calculus
Pretend the world's population in 1989 was 5 billion and that the projection for 2017 is 7.5 billion. What annual rate of growth is assumed in this prediction?
June 27, 2014

calculus
Pretend the world's population in 1989 was 5 billion and that the projection for 2017 is 7.5 billion. What annual rate of growth is assumed in this prediction?
June 27, 2014

physics
140
June 27, 2014

math
find if 6 box have.they each having60,30,20 and 15 what next two
June 27, 2014

math
Share 7m in the ratio 32:3
June 27, 2014

math
The sales goal for your store this week $22,682. The sales goal for your store this week last year was $20,128. Your store has averaged 1775 transactions perweek or the last four weeks. What is the percent change in your sales goal from this week last year to this week this year?
June 27, 2014

Algebra
Find the GCF 12x^3 and 20x^2. 4x^2????
June 26, 2014

science
Thank you ;)
June 26, 2014

science
This what I am stuck on, what specific policies might the United States enact to reduce its impact on global climate change? The rest I know how to complete.
June 26, 2014

science
As the United States is one of the largest contributors to atmospheric carbon emissions, what specific policies might the United States enact to reduce its impact on global climate change? Using at least two scholarly or reputable resources and your textbook, discuss the ...
June 26, 2014

psychology
humans rely heavily on the sense of because evolution designed us to be more active during the day time than at night
June 26, 2014

math
The cost of a regular price ticket to Saint Louis Cardinal baseball game as $60. During the world series, the price increased by 2/5. What did the fans pay?
June 26, 2014

english 2
Either you can eat or talk, but you can't do both at the same time.
June 26, 2014

english 2
People who attract a lot of friends are neither negative nor needy.
June 26, 2014

math psp
A number is300 when rounded off to the nearest hundred.what is the greatest possible value of the number
June 26, 2014

math
swimming pool 50 m x 20 m. how many 10 cmx 10 cm tiles needed for pool?
June 26, 2014

math
How much is 7.25 kg at $20 per kilogram?
June 26, 2014

Algebra
x^3 -5x-6=0 can you please tell me how to solve this algebraically? I tried using grouping method x(x^2-5)-6=0, I'm not sure what to do next.
June 26, 2014

statistics
A sample of 40 CDs from a student's collection showed a mean length of 52.74 minutes with a standard deviation of 13.21 minutes. Construct a 95% confidence interval for the population standard deviation. (Round your answers to 4 decimal places.)
June 26, 2014

physics
A 90 kg box is pushed by a horizontal force F at constant speed up a ramp inclined at 28°, as shown. Determine the magnitude of the applied force. when the ramp is frictionless. when the coefficient of kinetic friction is 0.18.
June 25, 2014

lwtech
In order to build a bridge across a river, a surveyor is hired to find the distance across the river. The surveyor places a stake on either side of the river. As shown in the diagram below (the diagram is not drawn to scale). He measures the bearing to the first stake as 16 ...
June 25, 2014

algebra
Thirteen times a number m is greater than or equal to three hundred. Is this statement True or False
June 25, 2014

physical
Two forces FA and FB are applied to an object whose mass is 9.39 kg. The larger force is FA. When both forces point due east, the object's acceleration has a magnitude of 1.40 m/s2. However, when FA points due east and FB points due west, the acceleration is 0.950 m/s2, ...
June 25, 2014

math
coppertone sport ultra sweatproof-spf 15 dry lotion contains 1.2 mg of otylmethoxycinnamate per fluid oz. how many micrograms of this chemical would be in 1/2 pint of the sunblock lotion?
June 24, 2014

statistics
Facebook reports that the average number of Facebook friends worldwide is 150 with a standard deviation of 90. If you were to take a sample of 25 students, what is the probability that the mean number Facebook friends in the sample will be 165 friends or more?
June 24, 2014

Math
8x8x8x8 base 2
June 24, 2014

Math
Give the standard "f(x)" definition of the function. Subtract one and then take the absolute value My answer : f(x)= |x|-1 is it correct?
June 24, 2014

chemistry
a student weighs out 37.0 grams worth of an unknown liquid into her graduated cylinder while preparing an experiment. Her formerly empty 100 mL graduated cylinder now contains exactly 25mL of liquid. She then adds 3.25 ml of H2O and according to her instructions the graduated ...
June 24, 2014

chemistry
Microwave ovens emit radiation with an energy of 2.05x10^-24 J for every photon released. What is the wavelength in nm for tis energy?
June 24, 2014

physics
A baseball pitcher throws a baseball horizontally at a linear speed of 50.6 m/s. Before being caught, the baseball travels a horizontal distance of 24.9 m and rotates through an angle of 54.5 rad. The baseball has a radius of 3.43 cm and is rotating about an axis as it travels...
June 23, 2014

Music
The time signature is 4/4 and so how can I figure out the value of an eighth note? Sixteenth note?
June 23, 2014

Math
i)When an identity is stated in terms of "x" what does say about the number x? ii)(generally) what are identities about? please help !!!!!
June 23, 2014

calculus
the weight of a person on or above the surface of the earth varies inversely as the square of the distance the person is from the center of the earth. if a person weighs 180 pounds on the surface of the earth and the radius of the earth is 3900 miles, what will the person ...
June 23, 2014

physics
If you have 2 objects of diferrent densities and you want them to have equal masses,what ratio of the volume to each other The answer I think the object with the greater density must have low volume compared to the other with small density
June 23, 2014

Leadership
How do you handle yourself when someone gets mad at you for punishing them when they clearly deserve it? (No multiple choices)
June 23, 2014

math
Six years after buying 100 shares of xyz stock for $40 per share you sell the stock for 6400. 6400-4000/4000=0.6 6400/4000=1.6 yx exponent in parentheses (1/4)=1.12468265 -1=0.12468265 =12.5
June 23, 2014

HELP!!!
Given the area of ABC=7.52m^2. Find a to the nearest hundredth meter when m<B=40 degrees and c=6m
June 22, 2014

Algebra 2
Every day, there are 5 times more likes on an internet video of a dog which is modeled by the function c(n) = (5)n − 1, where n is the number of days since the video posted. On the first day, there were 103 likes. What is the function that shows the number of likes each ...
June 22, 2014

math
Brett has been studying a type of bacteria that doubles every month. Originally, there were 5 bacterial cells. He wants to know how many there will be after 42 months. Which equation should he use? a42 = 5(2)42 − 1 a42 = 5(2)(42) a42 = 5(2)42 a42 = 5(2)(42 − 1)
June 22, 2014

Trig laws
Given the area ABC=7.52m©÷. Find a, when m¡ÐB=40¡Æ and c=6m.
June 22, 2014

Trig laws help
mÚA=15.52, c=18ft, b=16ft, then a=? ft
June 22, 2014

Physics
A plate carries a charge of -2.0 µC, while a rod carries a charge of +3.0 µC. How many electrons must be transferred from the plate to the rod, so that both objects have the same charge?
June 22, 2014

Physics
A plate carries a charge of -2.0 µC, while a rod carries a charge of +3.0 µC. How many electrons must be transferred from the plate to the rod, so that both objects have the same charge?
June 22, 2014

math
Find the simple interest on N280.00 for 2 and half years at 3% per annum.
June 22, 2014

Trigonometry help
A boat drops an anchor to the bottom of a lake. The anchor rope makes a 15 degree angle with the boat. The anchor rope is 24 feet long. To the nearest foot how deep is the lake? Would I use the cos function giving me 23 or the sin function giving me 6 but how would my set up be?
June 21, 2014

Algebra/Steve
thank you. and it keeps my mind on something else instead of crying Thank you for the prayers
June 21, 2014

chemistry
Can anyone explain to me the rate of disappearance and appearance? I had two problems and ive figured them out but i dont understand why they were solved this way. If the rate of appearance of Cr(SO4)3 is 1.24mol/min then what is the disappearance of C2H6O? 2 K2Cr207 + 8 H2SO4...
June 21, 2014

programming oop
I need a help regarding this. Compute and display the sum o 1st and 2nd number, Difference of sum and 3rd number, product of difference and 4th number, Quotient of product and 5th number using Eclipse Helios. My subject is OOP
June 21, 2014

programming
I need a help regarding this. Compute and display the sum o 1st and 2nd number, Difference of sum and 3rd number, product of difference and 4th number, Quotient of product and 5th number using Eclipse Helios. My subject is OOP
June 21, 2014

math
Create an equation you could use to calculate the cost one person spends on food for a year (assume no tax on the food), using this site. Your equation must work for any age range, and any gender
June 21, 2014

geometry
Find the image of P(–2, –1) after two reflections; first , and then . A. (–2, –1) B. (–1, –6) C. (4, –9) D. (1, –5)
June 21, 2014

business
You have just received good news. You have inherited $1,000,000 from a distant relative. You have to meet two goals with the money: one, start a small business and not spend more than $250,000 in total in the next 2 years, and two, save for your retirement in 30-35 years. How ...
June 21, 2014

chemistry
thank you
June 21, 2014

chemistry
What is the magnitude change in pH when 1.8g of NaOH is added 1L of a solution that is 0.100M in NH3 and 0.100 in NH4Cl? Kb for NH3 1.8 * 10^-5
June 21, 2014

algebra
To repair his kitchen subfloor, John cut a rectangular piece of plywood such that width and length were two consecutive odd integers. If the product of the length and width is 99, what were the dimensions of the piece of plywood?
June 20, 2014

math
I want to make a recipe which calls for 4/7 cup of granola. I only want to make 3/8 of the recipe. How much granola do I need to use.
June 20, 2014

health
Can someone help explain these directions?? For the energy-yielding nutrients, please convert the amount (grams) consumed to calories.  This can be done by multiplying the amount of that nutrient consumed by the respective number of calories it provides (protein and ...
June 20, 2014

health
I am having difficulty with calculating the energy-yielding nutrients to gram and calories in order to figure out percent of energy contributed by that nutrient.
June 20, 2014

stats
A random sample of 50 households in community A has a mean household income of X =Rs. 44,600 with a standard deviation s =Rs. 2,200. A random sample of 50 households in community B has a mean of X = Rs. 43,800 with a standard deviation of Rs. 2,800. Estimate the di&#...
June 20, 2014

Math
A radioactive material takes 60 days to cut its radiation in half. If it starts at 100%, when will it be at 5%?
June 19, 2014

chemistry
what would the written chemical reaction be to this problem? How many grams of hydrochloric acid should we use so we have exactly enough to react with 40g of sodium hydroxide? You'll need to write a chemical reaction, balance it, and then perform your calculation.
June 19, 2014

math
Jefferson Bank made a loan at 6% interest for 146 days. If the amount of interest was $36.50, use the ordinary interest method to find the amount of principal borrowed. Round to the nearest whole dollar amount
June 19, 2014

physics
Find the work done by 2.32 moles of an ideal gas if its volume doubles at a constant temperature of 22.6°C.
June 19, 2014

Chemistry
A solution of KCI is saturated at 50 degrees C. How many grams of solute are dissolved in 100g of water?
June 19, 2014

chemistry
A solution contains 72.0 g of HCl and 468 g of (C6H6). What is the mole fraction of benzene?
June 19, 2014

Physics
You have a grindstone with a mass of 90.0 kg, 0.340-m radius, and is turning at 90.0 rpm. You press a steel ax against it, bringing it to a stop in 36.0 s. (a) What is the change in kinetic energy of the grindstone? (b) If the tangential force due to the friction between the ...
June 19, 2014

english
1. Give two examples of each of the following elements of fiction and nonfiction from the texts you’ve read in Units 1, 2, and 3. Characters: Plot: Conflict: Setting: Point of View: Theme: Style: Tone: Perspective: Bias: Purpose:
June 19, 2014

physics
Physics? Looks like elem calculus to me.
June 19, 2014

math
From a survey of 100 college students, a marketing research company found that 55 students owned iPods, 25 owned cars, and 15 owned both cars and iPods. (a) How many students owned either a car or an iPod (but not both)?
June 19, 2014

geometry
The angle of depression from D to F measures 25°. If EF = 10 yd, find DE
June 19, 2014

Trigonometry
solve: sec x-2^.5=0
June 19, 2014

physics
an electric hot water heater takes in cold water at 13.0 degrees celsius and delivers hot water. the hot water has a constant temperature of 45 degrees celsius when the "hot" faucet is left open all the times, and the volume flow rate is 5.0 x 10 ^-6 m^3/s. what is ...
June 18, 2014

Math
146 pound
June 18, 2014

Math
How much will it cost to carpet a room that's 12ft by 15ft if the carpet cost $25 per square yard
June 18, 2014

Finance
1. (Covered Interest Arbitrage) Harry Norman, a foreign exchange trader at UBS’s office in Tokyo has $2,000,000 or its yen equivalent to invest. He faces the following exchange rates and interest rates. Show how can he profit from the covered interest arbitrage? Spot rate...
June 18, 2014

Finance
1. (Covered Interest Arbitrage) Harry Norman, a foreign exchange trader at UBS’s office in Tokyo has $2,000,000 or its yen equivalent to invest. He faces the following exchange rates and interest rates. Show how can he profit from the covered interest arbitrage? Spot rate...
June 18, 2014

Physics
46 mph
June 18, 2014

algebra
the quotient of g and 9
June 18, 2014

Chemistry
If 4.168 kJ of heat is added to a calorimeter containing 75.40 g of water, the temperature of the water and the calorimeter increases from 24.58°C to 35.82°C. Calculate the heat capacity of the calorimeter (in J/°C). The specific heat of water is 4.184
June 18, 2014

algebra
If John stands near a 30 foot tall tree and leans a 50 foot tall ladder against the tree that reaches to the top of tree, then how far is John standing away from the tree? (Round to the nearest hundredth)
June 18, 2014

physical chemistry
I DONT KNOW
June 18, 2014

math
Lily designed a deck in her backyard that is in the shape of a quadrilateral that has only 1 pair of parallel sides. What is the shape of the deck?
June 17, 2014

organic chemistry
1. Arrange the following in order of decreasing reactivity toward nitration. Fully explain please I could use some help!! A. acentanilide, b. bromobenzene, C. acetophenone, D. toluene 2. Explain why p-nitrophenol is a stronger acid than phenol itself? Would p-methoxyphenol be ...
June 17, 2014

algebra
a rise of 4 meters and a rise of 6 meters
June 17, 2014

Math
Thanks ...its easy for you because your good in math. IM not.
June 17, 2014

Math
Use back substitution to solve the system of linear equations x-2y+z=8 y+z=5 z=2 **I tried to solve it eventho im still confused/lost. 1=3 idk ugh
June 17, 2014

algebra
Select the approximate values of x that are solutions to f(x)=0, where f(x) = -2x^2+8x+5
June 17, 2014

chemistry
"To save on production costs, most automobile bumpers are never coated with more than 200 g of chromium. Determine how much time a standard bumper should be immersed in a chromium vat." This is what I have so far- 96,485 coulombs are required to plate 1 Cr; 52/6 = 8....
June 17, 2014

MATH
Solve the system of linear equations 2x+y-3z=4 4x+2z=10 -2x+3y-13z=-8 *im so lost (all these numbers are in one problem)
June 17, 2014

algebra
scs paid $4400 to buy desks.it bought d desks all together.What algebric statement shows the cost for one desk?
June 17, 2014

medical billing
if an institutional review board is involved in a request information, the information is likely by a
June 17, 2014

Organic Chemistry
These questions are somewhat difficult. I believe I am on the right track, but I want to make sure. 1. List these compounds in order of decreasing reactivity towards nitration. Explain your answer. a) acetanilide b) bromobenzene c) toluene d) acetophenone 2. a) Which is the ...
June 17, 2014

physics
A person sitting quietly in a room on a winter day may lose heat primarily by radiation from the outer surface of her clothes to the walls of the room. If the walls are at 11.5° C and the rate of radiation is 75.2 kcal/h (a typical basal metabolic rate), what is the ...
June 17, 2014

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