Friday
November 28, 2014

Posts by sam


Total # Posts: 4,077

Math
how to solve polynomiels?
February 11, 2013

Pre Algebra
I have to design new dice for a board game. I have to use two standard cubes each with six faces and number then in such a way the the probability of rolling the numbers 1-12 are the same
February 11, 2013

Math
Write a number sentence. Marshall sleeps 8 hours each day. How many hours does Marshall sleep in one week? How many hours is Marshall awake each day
February 11, 2013

physics
A crane is used to hoist a 500kg crate vertically at a constant velocity of 4 meters per second. Ignore the effects of friction. a) calculate the magnitude of the net force experienced by the crate b) calculate the magnitude of the force applied by the cable on the crate
February 11, 2013

math
how many square feet are there in an area of 1.00 square meters(1ft=0.305m)?
February 10, 2013

geometry
Got it! A) Write a variable expression for the area of the picture. x² <==ANSWER B) Write a variable expression for the total area of the poster. (x + 15)(x + 6) <==ANSWER C) Use your solutions to parts A & B to write a variable expression for the area of the border...
February 8, 2013

geometry
a poster art exhibition is to display a square picture with a white border around it. The border must be 10 in. wide at the bottom, 5 in. wide at the top, and 3 in. wide on each side. Using x to represent the length of a side of the picture. A) Write a variable expression for ...
February 8, 2013

Solving linear equations
You need to look at the differences between each number. At some point a pattern will repeat, and you follow the differences to determine the next number in a sequence. Do you have an example you can post? Example: 2,5,6,8,11,12 The difference between 2 & 5 is 3 The difference...
February 8, 2013

math
how many square feet are there in an area of 1.00 square meters(1 ft=0.305)
February 8, 2013

Chemistry
At a certain temperature, the solubility of gas in water at 2.04 is 48.0 . Calculate the solubility of gas in water, at the same temperature, if the partial pressure of gas over the solution is increased from 2.04 to 6.00 .
February 8, 2013

physics
From a height of 2.15 m above the floor of Boston's Fleet Center, forward Paul Pierce tosses a shot straight up next to the basketball hoop with a KE of 5.40 J. If his regulation-size. basketball has a mass of 0.600 kg, will his shot go as high as the 3.04 m hoop? Use the ...
February 7, 2013

world history
The development of an atomic bomb by the United States did which of these? A. pressured German leaders to surrender B.increased tensions between Truman and Stalin C. worried the leaders of France and Great ritain D.led Stalin to postpone a Soviet invasion of Japan
February 7, 2013

U.S History
The development of an atomic bomb by the United States did which of these? A. pressured German leaders to surrender B.increased tensions between Truman and Stalin C. worried the leaders of France and Great ritain D.led Stalin to postpone a Soviet invasion of Japan
February 7, 2013

Math
How to divide4/5 divide 7/8
February 5, 2013

Algebra 1 I need help!!!!!!!!!!!!!!!!
8.A number raised to a negative exponent is negative. Is it always , never, or sometimes. 7. Evaluate 1/2a^-4b^2 a = -2 and b = 4 remember a^to the negative 4 6. Simplify. Write in scientific notation. (9 x 10^-3)^2 Thanks to anyone who helps right away and need right answer ...
February 4, 2013

Physics
A particle is traveling in a straight line at a constant speed of 28.5 m/s. Suddenly, a constant force of 12.0 N acts on it, bringing it to a stop in a distance of 61.9 m. (a)Determine the time it takes for the particle to come to a stop. s (b) What is its mass? kg
February 4, 2013

math
The graph of a function is horizontally compressed by a factor of 5 and vertically compressed by a factor of 2 Find an equation for this compressed function in terms of the function f(x)
February 4, 2013

Calculator Question
how do I input ln7/ln2/5600 correctly in my calculator to get 2900 as my answer?
February 4, 2013

Chemistry
What is the activity coefficient of H^+ in a solution containing 0.073 M HCl and 0.0090 M Ca(ClO4)2? What is the pH of the solution? I believe I have to find the ionic strength of the solution first, but I don't know how to find it when 2 solutions are involved.
February 4, 2013

Chemistry
Thank you! That was the correct answer. Plus I finally figured out why that was the correct answer :)
February 4, 2013

Chemistry
Complete the charge balance equation for an aqueous solution of H2CO3 that ionizes to HCO3^- and CO3^2- ______ = ______ + _______ + _______ Given choices: [HCO3^-],[CO3^2-], [OH^-], 2[H^+], [H2CO3], 2[CO3^2-], 3[H^+], {H^+] I don't understand how to do charge balance :(
February 4, 2013

Chemistry
Thank you for answering! I got .0099 for the ionic strength. I just don't understand how to calculate the activity coefficient though. We just learned the concept and I'm confused.
February 4, 2013

Chemistry
Find the Concentration of CrO4^2- in 0.0033M Ba(NO3)2 saturated with BaCrO4. Include activity coefficients in your solubility-product expression. Ksp of BaCrO4 = 1.17 x 10^-10 I have no idea what to do to solve this :(
February 4, 2013

physics
Tarzan swings through the jungle by hanging from a vine. At the lowest point of a swing, Tarzan's acceleration is.... A. zero B. not zero C. one cannot be sure whether it's zero or not zero without additional information.
February 2, 2013

math
Identify the solution(s) of the system of equations, if any. -4x - 4y = 4 4y = -4x - 4 A) no solution B) (0, -1) C) (-1, 0) D) infinitely many solutions
January 31, 2013

Health
what 2 categories does ecstasy belong to? Name five body organs that can be damaged by drug abuse?
January 30, 2013

physics
90 g of water at 25C mixed with 50g of another substance at 100C result in 45C what is specific heat of that substance
January 29, 2013

Ms. Sue
Ms. Sue did you need help on that question? If it's a division problem i could help...the answer to that math problem is...1.50..DON'T BELIEVE ME? WRITE THE ANSWER DOWN AND TAKE IT TO SCHOOL AND SEE IF YOUR CORRECT..just saying!!
January 28, 2013

Calculus/Algebra
Let the demand and supply functions be represented by p=D(q) and p=S(q), respectively, where p is the price per item in dollars and q is the quantity of items. D(q) = 42-.03q S(q) = .02q -20 Find the equilibrium price. Hint: you will first find the equilibrium quantity (q) and...
January 28, 2013

Calculus/Algebra
your company produces designer dog-leashes. the marginal costs are $4.50 per leash and each leash is sold for $12.00. You need to produce and sell 75 dog leashes per month in order to break even. Based on this information, what are your monthly fixed costs?
January 28, 2013

Calculus
Grain is being dropped into a silo from a tall conveyor belt forming a right circular cone with diameter at the base equal to the height. The grain is being added at the rate of 10 cubic inches per second. How fast is the height changing when the height is 80 inches
January 27, 2013

Math
Give the domain of the following functions. Give your answer in interval notation. a) f(x)= 5x-2/x^2-5x+6 and b) square root of 5-2x
January 26, 2013

Math
your company produces designer dog-leashes. the marginal costs are $4.50 per leash and each leash is sold for $12.00. You need to produce and sell 75 dog leashes per month in order to break even. Based on this information, what are your monthly fixed costs?
January 26, 2013

Introduction to management
young innovative or high tech firms often adopt the strategy of ignoring history of attempting to do something radically new.in what ways will this strategy help them?in what ways will this strategy hinder them/
January 24, 2013

ALLIED HEALTH
If you work in a hospital or doctor's office and assign numeric values to procedures and diagnoses for the purpose of reimbursement, you are a
January 24, 2013

math
where N is the number of millions of passenger cars in the United States and t is the number of years after 1940. In what year was the number of passenger cars triple the number of cars in 1940?
January 24, 2013

chemistry
3. Find the molarity of a solution made from 734 g of Li2SO4 and 2.5 L of water
January 24, 2013

algebra
the number of locust doubles every minute and the skies were full after one hour, when were the skies half full?
January 22, 2013

Chemistry
How many equivalents are in 1.75L of a 8.2M solution of sulfuric acid.
January 22, 2013

Chemistry
How many equivalents are in 1.75L of a 8.2M solution of sulfuric acid.
January 22, 2013

Maths
Find The altitude of a right circular cone of maximum curved surface which can be inscribed in a sphere of radius 'r'.
January 22, 2013

math
Use the quadratic equation
January 20, 2013

Math
Sorry to the right
January 18, 2013

Math
100, 23.55 200, 27.6 998, 65.6 999, 69,1 and you can find points in between to make your graph, It will be an upward graph to the left
January 18, 2013

Math
#5. If a rancher has one cow with a contagious disease in a herd of 1000, then the time in days “t” for “n” of the cows to become infected is modelled by: t= -5ln((1000-n)/999n where “ln()” stands for natural logarithm function. a) Find the number...
January 18, 2013

Math
111. Cold Water Survival When a person falls through the ice on a lake, the cold water removes body heat 25 times faster than air at the same temperature. To survive, a person has between 30 and 90 seconds to get out of the water. How long could a person remain in air at the ...
January 18, 2013

Math
Suppose f is a function with range (-∞,∞) and g is a function with domain (0, ∞). Is it possible that g and f are inverse functions? Explain.
January 18, 2013

Math
How do I put this into the calculator: 4sqrt-1
January 18, 2013

math
what is the answer to 6x+4=34
January 17, 2013

Physics
a) 1336.36 b) 1.04 m/s c) o.o6 m
January 14, 2013

health
The ________the concentration of HIV in semen or genital fluids, the more likely it is that HIV will be transmitted to a sex partner. A. Lower B. Weaker C. Higher D. All of the above
January 13, 2013

Chemistry
SnCl4 PF3 H2O
January 11, 2013

Chemistry
(a) 10^-12*27*(x)^4 replace x with the solubility you have
January 11, 2013

4th grade math
We know each board is divided into 5 pieces, so the total number of pieces can be represented by 5x. Three-fifths of each board is taken away and 2/5 is left. That's 2/5 of the total number of pieces...2/5(5x). The leftover pieces equal the total length of four boards from...
January 9, 2013

math
How can 89/100 be writen in a decimal
January 7, 2013

Physics
An arrow was shot vertically upward at a velocity of 50.0 m/s. What was its velocity after 2.00 seconds?
January 5, 2013

Chemistry
what is the bond length of sulfur trioxide?
January 4, 2013

health
i think is c.four pairs
January 3, 2013

health
There are ________ of muscles that are responsible for chewing movements or mastication. A. Two pairs B. Three pairs C. Four pairs D. Five pairs
January 3, 2013

math
jenny opened a new loaf of bread to make a sandwiches for her friends. She needed 8 slices out of the 20 slices in the loaf. What percent of the loaf did she use?
December 29, 2012

Astronomy
Also Assuming that D is much greater than Rm find an approximate expression for the same tidal force, using Newton's approximation method
December 23, 2012

Astronomy
Suppose the Moon is at a (center-to-center) distance D from Earth. Find an exact expression for the magnitude of the tidal force applied by Earth to our rock of mass m in terms of D, m, the mass of Earth Me (input as M_e), and the lunar radius Rm (input as R_m).
December 23, 2012

Astronomy
Darwin proposed that the Moon formed far closer to Earth than it is now. Let’s see just how close it could possibly be to Earth and survive. In particular, in the next 4 problems you will find the distance from Earth at which the tidal force due to Earth is sufficient to ...
December 23, 2012

Astronomy
Consider the same asteroid initially in the asteroid belt at a distance 3 AU from the Sun, and 2 AU from Earth, which collides with Earth. As it falls towards Earth, it acquires kinetic energy (neglect its initial motion) both by being accelerated towards the Sun and towards ...
December 23, 2012

Astronomy
Consider an asteroid of radius 2 km and density 2,500 kgm3 impacting the Earth. When it collides with the surface its kinetic energy is, to a large extent, dumped into the environment, some as heat vaporizing rock and some as mechanical energy throwing rock to great distance ...
December 23, 2012

Astronomy
The volume of a ball is given in terms of its radius by V=4π3R3. Use this to find the average density of Saturn, i.e. the mass per unit volume. Use Earth’s mass in kg from the Table of Constants to express your answer in kgm3. Note for comparison that water has a ...
December 23, 2012

Astronomy
Saturn’s Moon Janus is observed to orbit the planet with period 0.695 days, grazing the planet with an orbital radius only 2.64 times the radius of the planet itself. Use this information to find the mass of Saturn. Express your answer as a multiple of the mass of Earth M...
December 23, 2012

Astronomy
At opposition, Saturn is observed to subtend an angular radius of 9.16 arcseconds (not including the rings). Use this and the conversion factors in our Table of Constants to find the radius of Saturn in km, rounded to three significant digits.
December 23, 2012

Astronomy
We observe that oppositions of Saturn repeat every 378 days. Use this information to find the sidereal period of Saturn. Express your answer in years and round to two significant digits.
December 23, 2012

Physics
82.2%?
December 19, 2012

Physics
If a drummer at a gig hits his a drum that has a diameter of .2m with a stick that has a mass of 0.5kg at .03m from the center. What percentage radial region is impacted with a force twice as great as the initial impact force?
December 19, 2012

PHISIC
I think kinetic energy is converted into gravitational potential then into strain energy .how about this is it correct plz help
December 19, 2012

PHISIC
A bouncy rubber ball is dropped from a height of about a metre above the ground .it falls to the ground, bounces and then rises back to almost the height from which it was dropped. Describe the main energy transformations that take place from the point at which the ball first ...
December 19, 2012

calculus
tysm
December 17, 2012

calculus
it says lim as x>-3 x+3/ x^2+7x+12 I need to find the limity using subsitution, a table, or by graphing...
December 17, 2012

science
A bouncy rubber ball is dropped from a height of about a metre above the ground .it falls to the ground, bounces and then rises back to almost the height from which it was dropped. Describe the main energy transformations that take place from the point at which the ball first ...
December 17, 2012

physics
A bouncy rubber ball is dropped from a height of about a metre above the ground .it falls to the ground, bounces and then rises back to almost the height from which it was dropped. Describe the main energy transformations that take place from the point at which the ball first ...
December 17, 2012

English - Ms. Sue help
I need help with this question, I can't find the internal.
December 17, 2012

Physics
Its a balloon filled with the nitrogen gas balloon and its about the flow of nitrogen through a hole. The thickness of the balloon, total surface area and the diffusion coefficient is given. I am bit confused about the problem as well.
December 15, 2012

Physics
Hello I am trying to solve this physics problem related to effusion of gases. The following data is given and I am asked to calculate the rate of effusion The data given; depth/thickness (t) Surface area (A) diffusion coefficient (D) Can someone help me out? The only law ...
December 15, 2012

physics
wf^2 = wi^2 + 2 (alpha) * (angle of rotation (delta theta)) delta theta = (1.76^2 - 0.77^2) / 2*0.29 delta theta = 2.36 (check me on my math))
December 13, 2012

Algebra help
Dave buys 3 green peppers and 2 red peppers for $3.45. Ruth buys 4 green peppers and 3 red peppers for $ 5.00. Find the price of each variety of pepper.
December 13, 2012

physic
A bouncy rubber ball is dropped from a height of about a metre above the ground .it falls to the ground, bounces and then rises back to almost the height from which it was dropped. Describe the main energy transformations that take place from the point at which the ball first ...
December 13, 2012

geometry
an arrow pointing down
December 10, 2012

math pre-calc h
It says which expressiion is equivalent to sec T + csc T / 1+tan T a. sin t b. cos t c. tan t d. csc t I'm not sure what to do first to find it out.
December 9, 2012

precalc h
okay I get it now, thanks so much. I have another one at the bottom of this question.. could you help me with it? But THANKYOU SO MUCHCHCH! I get it. :--)
December 9, 2012

precalc h
OH nevermind about that .
December 9, 2012

precalc h
How would x'ing the right side of the plus side by sin give you (1-cos)^2
December 9, 2012

precalc h
I don't understand what you did?
December 9, 2012

precalc h
Theta = argument..
December 9, 2012

precalc h
The parenthesis were for the arguments.. My question was how do I verify this indentity
December 9, 2012

precalc h
sin(theta)/1-cos(theta) + 1-cos(theta)/sin(theta) = 2csc(theta) That question makes absolutely no sense.. could someone help me? or lead me in the direction to figuring it out? and.. (Beside the trig functions is theta) 1+1/cos = tan^2/sec-1
December 9, 2012

English
How coypu use duke in a sentence ?
December 6, 2012

chemistry
The vapor pressure of benzene, C6H6, is 60.0 mm Hg at 13.5°C. The molar heat of vaporization of benzene is 30.8 kJ/mol and R = 8.31 10-3 kJ/mol·K. What is the vapor pressure of benzene at 70.0°C?
December 5, 2012

Physics
dont know
December 5, 2012

chemistry
I keep getting 469, but that's apparently not the answer...
December 5, 2012

chemistry - still need help
Never mind that one. I figured it out. But please help me with this one. The vapor pressure of benzene, C6H6, is 60.0 mm Hg at 13.5°C. The molar heat of vaporization of benzene is 30.8 kJ/mol and R = 8.31 10-3 kJ/mol·K. What is the vapor pressure of benzene at 70.0&...
December 5, 2012

chemistry
The vapor pressure of methanol is 84.0 mm Hg at 27.0°C. The ΔHvapor of methanol is 39.2 kJ/mol and R = 8.31 10-3 kJ/mol·K. Calculate the normal boiling point of methanol in Kelvin.
December 5, 2012

math
I say.........2 and 5/5
December 5, 2012

math 6th grade
does anyone know what y=x is
December 4, 2012

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