Saturday
April 19, 2014

Posts by Melissa


Total # Posts: 1,106

Physics-Please check
We're just learning this and I think I mixed up G=6.673E-11 from another problem and what my brother was telling me to simply do mass of electron * 9.8N/kg. I was accidentally combining two differnet things and not doing it correctly sorry for not understanding it right aw...

Physics-Please check
I'm trying to find the gravitational force of an electron at earth's surface. I know I say Fg = mass electron * gravity Gravity in this case is 6.673*10-11 m^2/kg^2 correct, not 8.93 * 10^-30N that we used for force of acceleration, right. I use the universal constant ...

Statistics
What score in a distribution that has a mean of 500 and a standard deviation of 100, would identify the top 60% of scores?

math
If there are only two cards left it would be a 50% chance of picking the Queen of Hearts.....

calculus
f(x)= x^3/(2x-5)^4

calculus
find the derivatives F(x)=8ln(x^5-2x)

math
The table shows the amount of marbles brandon has in each bag. Brandon's Marbles bag) 1,2,3,4,5,6 marbles)12,11,12,20,21,20. What is the range?

Physics
A square steel plate is 9.00 cm on a side and 0.600 cm thick. Assume that the plate is oriented with the square faces horizontal to the ground. A. Find the shear strain that results if a force of magnitude 1.00×106 N is applied to the top square face of the plate, parall...

grade 7 math
how can you figure out the length of a shadow if you walk closer to a lamppost?

Interest Rates
Homer won a prize in the lottery of $1000, payable $500 immediately and $500 plus 4% simple interest payable in 250 days. Getting impatient, Homer sells the promissory note to Moe for $450 cash after 130 days. Using a nominal 360 day year, find the simple interest rate, rounde...

calculus
find the derivative of F(x)=x^2-4/1+lnx

calculus
find the derivative of s(t)=(1+e^t)ln t

Math(Probability)
**Describe the outcome space** (a)If a Families that have three children each and select one such family at random. Describe the sample space S in terms of their children as 3-tuple, agreeing for example that "gbb" would indicate that the youngest is a girl and two o...

Chemistry
A 30 mL sample of 0.150 M KOH is titrated with 0.125 M HClO4 solution. Calculate the pH after the following volumes of acid have been added: 30 mL, 35 mL, 36 mL, 37 mL, and 40 mL.

Chemistry
A 30 mL sample of 0.150 M KOH is titrated with 0.125 M HClO4 solution. Calculate the pH after the following volumes of acid have been added: 30 mL, 35 mL, 36 mL, 37 mL, and 40 mL.

math
In math class, students must randomly draw a card that contains an equation that they must graph on the board. If the cards contain the equations 2y = 4x + 2, x(x + 1) = 0, 2x + y = 0, x = 2y , x2 + 1 = 0, and y - 2x = 0, then what is the probability that a student will graph ...

Math
What is the shape of the schoolyard if four sides measure 40feet each and the fifth side measures 50 feet?

Math- Linear Programming
A dog food is to be mixed from three kinds of ingredients: rolled oats, beef parts, and whey. The cost of each is 20 cents, 40 cents, and 35 cents per lb. Each ingredient contains 50, 450, and 200 units of protein and 350, 65, and 100 units of carbohydrate respectively. The mi...

calculus
a company maufacturing surfboards has fixed costs of $300 per day and total costs of $5100 per day for a daily output of 20 boards. Assume the total cost per day C(x) is linearly related to the total output per day x. write an equation for the cost function, and write an equat...

calculus
solve x^6<16x^4

math
how do u figure that out

math
thanks k so what about this... thirty percent of what number is 120?

math
so if u had 4% of 56 it would be o.o4 *56=the answer

math
thanks so u move the decimal two to the left on the first #

math
how do u figure out what 18% of 34 is?

math
Perform the indicated operation and, if possible simplify. 7/12+(-3/5)

Physics
The force on an object is described as a function of time equation: F(t) = 3t^2+7t What is the impulse delievered by the force over a period of time from 0 to 5.0s? What is the average force exerted on an object over this time period? If the object has a mass of 2.0kg and is i...

English
I am trying to analyze Wendi Kaufman's "Helen on Eighty-Sixth Street." I do not understand what Vita's mother means when she says "Truth is beauty and beauty is truth..." Please explain the meaning of this quote.

social studies
were the british justified using that amount of force against the french in 1837? use examples from 2011 to help explain your awnser

Math
Consider a polygon ABCDE with coordinates A(0,4), B(3,0), C(7,2) , D(11,6) and E(8,15) Choose all possible pairs from below at which a maximum over the region can be attained by a non constant linear function. [(0,4),(7,2)] [(0,4),(8,15)] [(7,2),(11,6)] [(11,6),(8,15)] [(0,4),...

12th grade English
do the bib and note cards for elizabeth barret browning and robert browning

physics
A 214 kg boat is sinking in the ocean. The boat's weight is partially offset by the 790 N buoyant force of the water. What is the net acceleration of the boat?

mangement science the art of modeling w/ spreadshe
Five years ago, an automobile manufacturer started offering an extended warranty to buyers of its sport-utility vehicle.  The extended warranty covered defects occurring after the initial three-year warranty expired.  Of the 10,0...

business
discuss the ways in which a business might respond to growing awarness of environmental issues among its customers?

introduction to business
retailing has undergone a major change in technology in the past few years with the introduction of internet trading. many customers now order their goods online. discuss the benifits and drawbacks for retailers in this growing line of business?

spanish
do any of these words have accents? (if so please identify them): - abrigo - rapido - sabado - vez - menu - operacion - impermeable - ademas - regatear - antipatico - farmacia - esqui - pension - pais - perdon

math
using only whole numbers, how to can i draw 3 rectangles with perimeter of 12 units

chemistry
a sample of gas has a volume of 12liters at 0 degrees celcius and 380 torr. what will be its volume whent the pressure is changed to 760 torr at a constant temperature?

Chemistry
do I use the Ksp of MfF2 and plug it in the equation?

Chemistry
Calculate the molar solubility of MgF2 in 0.08M MgCl2 at 25 degrees C.

Chemistry
I'm not to sure what you mean by "the same"

Chemistry
I'm not to sure what you mean by "the same"

Chemistry
If a saturated solution prepared by dissolving solid BaSO4 in water has [Ba2+]= 1.04*10^5M, what is the value of Ksp for BaSO4?

Biochemistry
Complete hydrolysis of 25 mM ethyl acetate in an enzyme esterase catalyzed reaction is carried out in a 40 mM NaCl solution buffered by 0.2 M Tris-Cl, pH 9.1. What is the pH at the end of the reaction? (For Tris base, which is the abbreviation for Tris (hydroxymethyl) aminomet...

math
Angle U and Angle V are complementary angles. If Angle U is three less than twice Angle V, what are the measures of the angles?

Math-Equations
I haven't posted this before. I've been working on this for 2 days and I didn't search the website for this problem again today. Someone else must have posted it. I just couldn't figure out the equations. Thanks anyway.

Math-Equations
A building contractor is planning to build an apartment complex with one, two or three bedroom apartments. Let x,y,z respectively denote the number of apartments of each type to be built. Suppose that the builder will spend a total of $6,885,000, and that the costs for the thr...

Chemistry
A 119.2mL sample of 0.105M methylamine (CH3NH2, Kb=3.7*10^-4) is titrated with 0.255M HNO3. Calculate the after the addition of each of the following volumes of acid. 49.1mL and 73.6mL. Please help.

Chemistry
A 23.0mL sample of a diprotic acid is titrated with 0.260M KOH. If 55.5mL of base is required to reach the second equivalence point, what is the concentration of the acid? I'm not sure how to do this.

Algebra
The area of the top of a triangular corner desk must be at least 7 sq. ft. If the base of the triangular desk top needs to be four feet, what should the height be?

new age math
Please someone help

new age math
A value of the number k for which there is either no solution or an infinite number of solutions for (y,v) to the system of equations show below 7y-9v=-9 Ky+7v=7

geometry
if 32 degrees is less than three times its supplement, how large is the angle?

AP Chem
I figured out the first part but don't understand the second part still. I looked at the response you had for someone else, but still couldn't get the right answer.

AP Chem
The formula for epson salts is MgSO4*7H2O. If 1.250 g of the compound is dissolved in water, calculate the number of milliliters of 0.200 M Ba(NO3)2 that would be required to precipitate all of the sulfate ions as barium sulfate. Make the same determination for 1.000 g of alum...

English
How can I rewrite this sentence: A boy and his bog sat by a house?

math
joseph is planning a 2500 mile cross-country trip in his new sports utility vehicle. he uses the following information about his vehicle to figure out how much money to budget for gas: . the vehicle has a 15 gallon tank . the vehicle gets 25 miles per gallon if the gasoline co...

math
sandra is making 3 gallons of lemonade reception.If each scoop of powdered lemonade mix dissolves in enough water to make 3 quarts of punch,how many scoops of powdered mix will she use? ( hint: 4 quarts = 1 gallon

Supply/Math
The suppliers will supply 3,300 units if the price is $350.00 and 3,800 units if the price becomes $410.00. Then the linear supply equation is p = ? s + ? .

math
The question says .. match the equivalent addition and subtraction expressions a) -6 -9 b)-10 - (-12) c)6-9 d)10-12 e)-12-10 A)10+(-12) B)-6+(-9) C)-12 + (-10) D)6+(-9) E)-10+12

math
The question says .. match the equivalent addition and subtraction expressions a) -6 -9 b)-10 - (-12) c)6-9 d)10-12 e)-12-10 A)10+(-12) B)-6+(-9) C)-12 + (-10) D)6+(-9) E)-10+12

Place Value
Choose between the numbers 0, 2, 3, 4, 5, and 6 to make the largest four digit natural number in terms of value that you can. The number 078 has two digits. The number 00045 has two digits. Choose between the same numbers to make the smallest four digit number in terms of valu...

physics
Find a vector with a magnitude of 1.00 that bisects the angle between the vectors 5.00i + 11.0j and 2.00i − 1.00j. Give your answer in rectangular coordinates. Please explain how you arrived at the solution. Thanks!

Algebra
Using the following six digits, 1, 2, 4, 6, 8, and 9, fill in the blanks below to make the maximum product that you can. Use each digit only once. How does an understanding of place value help determine the best solution to this problem?

economics
what are the non-monetary benefits of growing tobacco, of working as a plumber's assistant, and of working as a carpenter during the spring and summer and storing travel trailers for a local campground and selling oysters during the fall and winter?

Principles of Macroeconomics
What are the non-monetary benefits of growing tobacco, of working as a plumbers assistant, and of working as a carpenter during the spring and summer and storing travel trailers for a local campground and selling oysters during the fall and winter?

physics
How many uniform, identical textbooks of width 25.0 cm can be stacked on top of each other on a level surface without the stack falling over if each successive book is displaced 3.00 cm in width relative to the book below it? If the books are 5.00 cm thick, what will be the he...

statistics
For a population that has a standard deviation of 10, figure the standard deviation of the distribution of means for samples of size 3

Math: Algebra 2
Factor Completely with respect to the intergers. 2x^3-3x^2+4x-6

physics
Two masses are suspended from a pulley as shown in the figure below (the Atwood machine). The pulley itself has a mass of 0.20 kg, a radius of 0.15 m, and a constant torque of 0.35 m·N due to the friction between the rotating pulley and its axle. What is the magnitude o...

physics
well i dont really know how to explain the first part sorry.. but a negative acceleration for a car means the car is stopping.

social studies
thanks for all the help!!!(:

social studies
no i am not

social studies
how do you learn how to cook or do a job in medieval times? how do u get the job to be a cook in medieval times?

social studies
how many outfits did cooks have in the medieval times

social studies
but how do people treat the cook in medieval times

social studies
how do people treat cooks in medieval times

social studies
how often do cooks in medieval times speak to the lord?

social studies
can cooks in medieval times get married and if so who to?

social studies
what would the materials be as a cook in medieval times?

social studies
in medieval times as a cook where on the manor estate is your shelter

social studies
how do cooks get a job in medieval times?

social studies
who would cooks in medieval times work for?

social studies
where did people work if they were a cook in medieval times

math
a.u.s nickel contains 3.9g of copper and 1.2g of nickel. how many kilograms of copper must be combined with 500 kg of nickel to make nickel coins?

Grammar
omg thank u soooooooooooo much

physics
A rope goes over a circular pulley with a radius of 6.3 cm. If the pulley makes four revolutions without the rope slipping, what length of rope passes over the pulley?

Economics
explain why the cost tructure associated with many kinds of information goods and services might imply a market supplied by a small number of large firms. At the same time, some internet businesses such as grocery home deliveries have continually suffered steeplosses regardile...

Math
Mark each of the following True or False. ___ a. All vectors in an orthogonal basis have length 1. ___ b. A square matrix is orthogonal if its column vectors are orthogonal. ___ c. If A^T is orthogonal, then A is orthogonal. ___ d. If A is an n*n symmetric orthogonal matrix th...

Spanish
Thank you-I understand it now more clearly

Spanish
How do I say I'm wearing black pants? "Llevo pantalones negro." or do I have to add an "s" to negro? Thank you

Spanish
Could someone help me please? Which of the following says "some strong men" in Spanish los hombres fuertes unos hombres fuertes I think it is unos hombres fuertes becuase the los hombres fuertes states the strong men, doesn't it

physics
Four identical masses of 2.7 kg each are located at the corners of a square with 1.4 m sides. What is the net force on any one of the masses?

physics
someone pleaaaase answer my question! i have no clue how to do it!

physics
A 70 kg man weighs 686 N on the Earth's surface. How far above the surface of the Earth would he have to go to "lose" 14% of his body weight?

Physics
A 3.90×10^2kg cube of ice at an initial temperature of -18.0degreesC is placed in 0.480kg of water at 41.0degreesC in an insulated container of negligible mass. Calculate the change in entropy of the system. I found the equilibrium temperature to be at 304.9K, then used ...

chemistry
what is the molarity of 275mL of a solution containing 23.83 mg of Mg Cl(2)<small 2

Statistics
A group of doctors is trying to see if a vaccine causes a certain type of disease. They take individuals with the certain disease and individuals without the disease. They then use research to estimate the relative incidence of the onset of the disease after the vaccination. W...

physics
An air puck of mass m1 = 0.45 kg is tied to a string and allowed to revolve in a circle of radius R = 1.0 m on a frictionless horizontal table. The other end of the string passes through a hole in the center of the table, and a mass m2 = 1.10 kg is attached to it. The suspende...

physics
A light spring of spring constant k = 160 N/m rests vertically on the bottom of a large beaker of water. A 5.00 kg block of wood (density D = 700 kg/m3) is connected to the spring, and the block ? spring system is allowed to come to a static equilibrium

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