
math
use implicit differentiation to find dy/dx and then d^2y/dx^2. y^2=ye^x^2+2x ans for dy/dx= [2(xye^x^2 + 1)]/(2ye^x^2) after that i don't know how to proceed. can someone show me the steps(x need for calculation) and final answer. i try to use wolfram but
asked by ifi on December 10, 2012 
physics
A particle executes simple harmonic motion with an amplitude of 10 cm and time period 6 s. At t=0 it is at position x=5 cm going towards positive x direction . Write the equation for the displacement x at time t. Find the magnitude of the acceleration of
asked by Pronab on November 18, 2010 
Prealgebra
I have some practice problems, and I need to have them worked out, showing your work. I will gain a better understanding of these problems by practicing them. Thank you. (6x+1)(x^29x+5) (2x^4+3)(4x^3+2) (12y^3+8y^2+20y)divided 2y (6x^225x10) divided by
asked by Sherrie on December 10, 2011 
Modern World History
where can i find a glossry of key people on here? Key people like Pericles, Plato, Socrates, Locke, and Michelangelo. Brief description of what they did and their accomplishmnents? Your best source is an encyclopedia like Wikipedia or Encarta. You can also
asked by Bryan on January 8, 2007 
Maths
if there is a cylindrical ride (radius r) and when it rotates the person feels pinned tot he wall and then the floor drops away. how would i start to find the equation of the angular speed needed to keep the person against the wall????
asked by Sarah on October 22, 2011 
art
i am doing a project about franz marc an i need some info on one of his animal paintings this info consists of: name: when it was made: how it was made: what it was about: does it tell a story: what is in it: is it happy sad boreing etc: how you feel: and
asked by sophie on February 12, 2009 
physics
An object is moving in the xdirection at 1.1m/s when it undergoes an acceleration a⃗ =0.56j^m/s2. Find its velocity vector after 4.8s . Express your answer as a commaseparated pair of components. Express your answer using two significant figures
asked by Anonymous on January 18, 2015 
MathREALLY CONFUSED
Ok, so this worksheet says that a regular heptagon has 7 sides. So, would it have 7 angles, 4 diagonals, 5 triangles, and that the angle sum of the figure is 900 degrees. Am I right on those? But then it says to find the "Measure of each angle". Wouldn't
asked by Catherine on March 21, 2011 
physics
Three charges are arranged in a line. From left to right, the charges are: Q1= 8mC, Q2 = +3mC and Q3 = 4mC. The distance between Q1 and Q2 is 0.3 m, and the distance between Q2 and Q3 is 0.2 m. Calculate the net electrostatic force on Q3. how can you
asked by seb on January 3, 2011 
Math
Show all work You have 92 feet of fencing to enclose a rectangular plot that borders on a river. If you do not fence the side alongthe river, find the length and width of the plot that will maximize the area.
asked by Liz on October 25, 2011 
art
Ancient native Americans chose willow strips to make baskets because there were easy to bend and to. A. easy to find B. rare and valuable C. multi colored D. waterproof I chose A is this correct
asked by jake on January 23, 2015 
English
Hello! Can anybody find me universities, where I can study law? in Europe...... I want to study in german language, but not necessarely in Germany or Austria:) Austria and Wien would be the best, because I live in Hungary, and thios country is close to my
asked by Lulu on October 30, 2009 
Physics
Two rods of equal length have same temperature differences between their ends. If their thermal conductivities are K1 & K2 & their areas of cross section are A1 &A2 respectively,find the condition that will ensure equal rates of flow of heat through both
asked by Megha on June 3, 2013 
math
Ted takes out a student loan to pay for his college tuition this year. Find the interest on the loan if he borrowed $2,500 at an annual interest rate of 6% for 15 years. What is the formula to figure this out ?
asked by sam on March 23, 2015 
Math
A piece of wire is 76cm long.it is cut into two unequal parts and each part is bent into a square.the sum of the areas of two squares is 205cm^2.find the length of the shorter part of the wire.
asked by Lili ming on June 5, 2016 
physics, HELP ASAP PLEASE!
a car starts and accelerates uniformly at a rate of 2.0 m / s ^ 2 in 6.0 s. Then, it maintains its constant speed for 30 seconds. Finally, the shrinkage slows down uniformly and stops to 5.0 s. find the total distance traveled by the car.
asked by sarah on October 13, 2011 
chemistry
The Ka values of maleic acid, HOOCCHCHCOOH, are shown below. Ka1 1.5 102 Ka2 2.6 107 A 50.0 mL sample of 0.11 M of maleic acid is titrated with 0.14 M NaOH. Calculate the pH at the following points in the titration curve. find the first and second eq
asked by Amy on March 8, 2009 
Math
Family wants to buy van in 2 years, they want to make a down payment of 25% of the estimated purchase price of $29,000. Find the amount they need to invest to make the down payment if funds earn 10% compounded semiannually.
asked by Vivianne on July 4, 2016 
chemistry
pls help. A weak acid HA (pKa = 5.00) was titrated with 1.00 M KOH. The acid solution had a volume of 100.0 mL and a molarity of 0.100 M. Find the pH at the following volumes of base added and make a graph of pH versus Vb: Vb = 0, 1, 5, 9, 9.9, 10, 10.1,
asked by Joycelyn on December 1, 2012 
statistics
The GPAs of all students enrolled at a large university have an approximately normal distribution with a mean of 3.02 and a standard deviation of .29. Find the probability that the mean GPA of a random sample of 20 students selected from this university is
asked by lol on April 16, 2013 
Algebra
Need help with these 21. Find the possible values of a, of the distance between the points is 5, and the coordinates are (1, 1) and (4,a) 22. The Pythagorean Theorem works only for _______ triangles. Right? 25. Three sides of a triangle are 2, 4, and 8.
asked by mysterychicken on June 21, 2010 
PreCal
[Note: This one... is super hard for me :( I really need help. please. I only have 2 hours left and I have no idea what I'm doing!! Suppose that cosx= 3/5 and x is in the third quadrant, and that siny= 2/9 and y is in the second quadrant. Find the exact
asked by Amber on July 12, 2016 
Maths
Bacteria in a culture grow 15 per thousand in an hour. If the count of bacteria in a sample is 1000000,after 2 hours it will be (a)1030225 (b)1080225 (c)1030125 (d) 1030200 The correct answer is option (a) help me to find the answer.
asked by Dipti Singh on October 24, 2017 
solid mensuration
Find the area of a cyclic quadrilateral whose 2 sides measure 4 & 5 units, & whose diagonal coincides with a diameter of the circle. Suppose the radius of the circumscribing circle is 2 sq.root of 3 units. Please include solution. Thanks.
asked by Cathy on December 1, 2012 
math
Compute the following costs of services problems. Hourly rate of labor = $12.00 Duration of job = 3 1/2 hours Overhead rate = 66 2/3% Price of parts = $112.50 Find total cost of job. $
asked by C on July 1, 2016 
calcules
cylindrical box will be tied up with ribbon as shown in the figure. The longest piece of ribbon available is 130 cm long, and 10 cm of that are required for the bow. Find the radius and height of the box with the largest possible volume.
asked by jasmine22 on March 25, 2014 
Physics please help!!
The mass of a star is 1.49·1031 kg and it performs one rotation in 26.1 days. Find its new period (in /days) if the diameter suddenly shrinks to 0.59 times its present size. Assume a uniform mass distribution before and after.
asked by Megan on March 14, 2011 
Math
The floor areas of a living room on a house plan measures 3 1/2 inches by 4 5/8 inches. If the scale is 1/4 inch = 1 foot, find the length of the longest side of room in feet. ________
asked by Mike on February 11, 2008 
algebra
The period of a pendulum is the time it takes to swing from left to right and back again. The period T seconds, of a pendulum is directly proportional to the square root of its length, Lcm. When L=25, T=1 Find a formula for T in terms of L.
asked by beth on March 20, 2012 
Math
A student sarts for her school at the speed of 12 km / hr & reaches school 4 mins earlier than the asembily.next day she cycles at 10 km / hr & is late by 6 mins & missed assembly . Find distance b / w herschool & home
asked by Sanjana on November 28, 2017 
STAT
A student takes a tenquestion truefalse quiz, but did not study and randomly guesses each answer. Find the probability that the student passes the quiz with a grade of at least 70% of the questions correct
asked by Cathy on February 20, 2015 
Statistics
Below are the numbers of games played in the World Series from 1903 to 2012. Find the mean, variance and standard deviation. Games played Probability 4 0.186 5 0.231 6 0.203 7 0.341 8 0.039
asked by E.man on February 20, 2015 
Physics help please
In an experiment done by scattering 5.5 MeV α particleson a thin gold foil, students find that 10,000 α particles arescattered at an angle greater than 90 degrees. How many α particles will be scattered between 60 degreesand 80 degrees?
asked by Sarah on September 30, 2014 
calcules
The price of beef in the United States has been found to depend on the demand (measured by per capita consumption) according to the equation q=342.5/p^0.5314 Find the elasticity. Is the demand for beef elastic or inelastic?
asked by Merfit on March 30, 2014 
math
What is the minimum value of N that will make this statement true: If we pick any N composite numbers from 1 to 1000, then we can find 2 numbers whose greatest common divisor is not 1. Details and assumptions You may use the fact that there are 168 primes
asked by harsh on February 13, 2013 
Physics
A horizontal spring is fixed at one end, then stretched 3.0 cm by a force of 6.0 N. Afterwards, a 0.50 kg body is attached, pulled 2.0 cm from its rest position, and released. Find (a) spring constant, (b) angular frequency, (c) frequency and (d) period.
asked by Dia on December 18, 2011 
Statistics and Probability
Commuters were asked how many times a week they stop for coffee on their way to work. A survey found a mean of 3 times a week with a standard deviation of 0.55. Find the probability that the sum of 100 values is more than 290.
asked by Alley on December 3, 2012 
biology
Aquatic organisms: A. have a waxy coating to prevent water loss B. may experience problems with water balance C. typically have a plentiful supply of nitrogen. D. never find light to be in short supply
asked by cc on October 9, 2014 
algebra
angela ate at the same restaurant four times each time she ate a salad and left a 5 dollar tip she spent a total of 54 dollars write and solve an equation to find the cost of each salad
asked by drew decker on October 19, 2011 
statistics
The average middledistance runner at a local high school runs the mile in 4.5 minutes, with a standard deviation of 0.3 minute. Find the percentage of a runners that will run the mile in less than 4 minutes?
asked by dw on March 5, 2012 
algebra
John wants to hire an editor to check his thesis paper. The editor charges a flat rate of $50 and $2 per page. Write a polynomial to describe the cost. Find the cost of editing 75 pages.
asked by billy on March 9, 2014 
statistics
Ramdom sample of 41 car owners results in a mean of 7 years. Population standard deviation of 3.75 years. Find a 95% confidence interval for the true population mean..My answer is (5.9, 8.1) but having problems with margin of error
asked by Anonymous on December 8, 2012 
math
A boat traveled downstream a distance of 9090 mi and then came right back. If the speed of the current was 88 mph and the total trip took 66 hourscomma nbsp, find the average speed of the boat relative to the water.
asked by taylor on January 31, 2017 
linear algebra
Determine whether {v1, v2, v3} is a basis for R3 v1 = [1] [3] [1] v2 = [3] [8] [4] v3 = [2] [2] [2] Put the vectors as rows or columns in a matrix and perform Gaussian reduction to determne the row or column rank. In this case you should find that the
asked by zinnia on August 5, 2007 
trig
the terminal side of angle theta in standard position lies on the line that travels through point (9,1), find sin of theta, cos of theta, tan of theta. (give exact values)
asked by ardian gashi on May 1, 2011 
Statistics
Given the following set of numbers: x=7.1, 1.8, 2.1, 1.5, 2.1. Find the median, mean and standard deviation. State the formulas (or procedure) for these values, plug the numbers into the formula and evaluate the results. Compare the mean and median. Which
asked by Maryan on November 18, 2010 
pre cal
Find the exact values for the lengths of the labeled segments a, b and p drawn in green, red, and blue, respectively. Note that r=9 is the radius of the circle, and s=8 is the arc length from the point (9,0) around the circle to the indicated point. *i
asked by tor on August 1, 2016 
statistics
The number of grams of carbohydrates in a 12ounce serving of a regular soft drink is listed here for a random sample of sodas. Find the 99% confidence interval for the mean number of carbohydrates in all brands of soda. 48 37 52 40 43 46 41 38 41 45 45 33
asked by Carolyn on November 21, 2012 
Statistics
Commuters were asked how many times a week they stop for coffee on their way to work. A survey found a mean of 3 times a week with a standard deviation of 0.55. Find the probability that the sum of 121 values is less than 350.
asked by Alley on December 3, 2012 
Precalc Math
Use the Law of Sines to solve for all possible triangles that satisfy the given conditions. (If an answer does not exist, enter DNE. Round your answers to one decimal place. Below, enter your answers so that ∠B1 is smaller than ∠B2.) a = 78, b = 109,
asked by Anthony on December 23, 2016 
geometry
not sure if youll understand but ill try and explain the picture is a trapezoid i believe b1 is 7cm, and do not have the height but the numbers on the long side is 8cm and the side of b2 is 4cm this part of the pic looks like a right triangle am not able
asked by kevin on March 31, 2012 
phsyics
A 8.0×10−2{\rm kg} toy airplane is tied to the ceiling with a string. When the airplane's motor is started, it moves with a constant speed of 1.30 m/s in a horizontal circle of radius 0.41 m, Find the angle the string makes with the vertical.
asked by Lisa on December 16, 2010 
Math
Two investments are made totaling $4800. In the first year they yield a total of $412 in simple interest. Part of the money is invested at 8% and the rest at 9%. Find the amount invested at each interest rate.
asked by Kate on April 11, 2013 
Physics
In figure, the mass m2 = 10 kg slides on a frictionless shelf. The coefficients of static and kinetic friction between m2 and m1 = 5 kg are µs = 0.6 and µk = 0.4. (a) What is the maximum acceleration of m1? (b) What is the maximum value of m3 if m1 moves
asked by Eric on October 17, 2011 
HCA
What can be considered the most problomatic factor that influences patient communication? Fow the most substantial I chose listening skills. I just need a lead, I am having trouble coming up with a problomatic factor.. I will elaborate on it once I find
asked by Jen on January 6, 2010 
cultural diveral
What differentiates the act of simply grouping people from the act of stereotyping? How can stereotyping effect group relations? Give an example of a stereotype you find in your everyday life. Comment on the experiences of your classmates—are they the
asked by brandy on February 17, 2009 
maths
a box is to be made from the piece of cardboard at right, where square corners of side x are to be cut out, and sides folded up, and top enclosed. Find the possible heights x of the sides when the volume of the box is 10, within the interval of length 1
asked by bob on March 10, 2011 
calculus
Construct a window in the shape of a semicircle over a rectangle.If the distance around the outside of the window is 12 feet.What dimensions will result in the rectangle having the largest possible area? We need to find Amax I know the circmfrence is 12
asked by fareha on December 13, 2011 
algebra
you receive a $25 gift card card to a sporting goods store for your birthday. you are looking at skateboards and want to spend no more than $85 of your own money. a. write and solve an inequality to find the prices(p)in dollars of skateboards you can buy
asked by blue13 on January 5, 2011 
physics
one nucleus decays by emitting an alpha aprticle of KE x Mev. if such alpha particle goes directly toward another nucleus of the same atom, what is the distance of closest approach? i don't quite get this question.am i supposed to find r since r=r0A^(1/3)?
asked by Emma on May 28, 2009 
Physics
A box of books weighing 328N moves with a constant velocity across the floor when it is paged with a force of 385N exerted downward at an angle of 25.3 below the horizontal. Find muK between the box and the floor
asked by Andy on November 6, 2012 
math
Commuters were asked how many times a week they stop for coffee on their way to work. A survey found a mean of 3 times a week with a standard deviation of 0.55. Find the probability that the sum of 100 values is more than 290.
asked by brewser on July 12, 2014 
math
what are inverse operations,ratios and proportions what is the formula to find the area of a cone, rectangular prism ,triangular prism, cylinderpyramid square pyramid They all have the same formula: Volume= 1/3 areabase*height
asked by ahmed on June 9, 2007 
geometry
The Transamerica Pyramid in San Francisco is shaped like a square pyramid. It has a slant height of 856.1 feet and each side of its base is 145 feet. Find the lateral area of the building.
asked by Hannah on May 15, 2013 
7th grade math help 2 question
#11 The coordinate of rectangle ABCD are given. Find the coordinates of its image after a dilation with the scale factor of 2. * A (2,4) B (3, 1) C (0,9) D (6,4) #10 On a blueprint, 1 inch = 13 feet. If the dimensions of the playroom on the blueprint
asked by Delilah on November 5, 2012 
Calculus
The region enclosed by the graph e^(x/2), y=1, and x=ln(3) is revolved around the xaxis. Find the volume of the solid generated. I don't understand if we have to use the washer method or the disk method for this one because when I drew it out on a graph
asked by Dave on March 1, 2017 
Calculus
The region enclosed by the graph e^(x/2), y=1, and x=ln(3) is revolved around the xaxis. Find the volume of the solid generated. I don't understand if we have to use the washer method or the disk method for this one because when I drew it out on a graph
asked by David on March 1, 2017 
Maths
£2000 is invested at x% interest over three years. At the end of three years the money has grown to £2963. To the nearest percentage find the rate of interest. If you could help me out I would greatly appreciate it. I've tried to figure it out numerous
asked by Steph on February 3, 2014 
math
The Transamerica Pyramid in San Francisco is shaped like a square pyramid. It has a slant height of 856.1 feet and each side of its base is 145 feet. Find the lateral area of the building.
asked by Hannah on May 16, 2013 
MATH
Two planes leave an airport at the same time, one flying east, the other flying west.The eastbound plane travels 100 mph slower. They are 3040mi apart after 4hrs. find the speed of each plane
asked by PLEASE HELP!!! on January 26, 2011 
stats
Commuters were asked how many times a week they stop for coffee on their way to work. A survey found a mean of 3 times a week with a standard deviation of 0.55. Find the probability that the sum of 100 values is more than 290.
asked by brewster on July 10, 2014 
physics (PLEASE READ)
when a chameleon captures an insect its tingue car extend 16 cm in 0.10 s. (a) Find the magnitude of the tongue's acceleration, assuming it to be constant.(b) In the first 0.050 s, dones the tongue extend 8.0 cm, more than 8.0 cm, or less than 8.0 cm?
asked by taylor on November 18, 2011 
social civics
the three basic types of government: mayorcouncil plan, the commission, and the mangercouncil plan. give at least one strength and one weakness for them . and size of city where most effective thanks alot i cannot not seem to find this in my book
asked by kc on April 9, 2010 
PHYSICS work on a ramp!!!
How much work is it to push a box (mass 190 kg) up an incline (angle 16 degrees with the horizontal) that is 8.3 meters long, if the coefficient of kinetic friction between the box and the incline is 0.6? My doubt is how do I find force?
asked by Matt on April 10, 2016 
physics
A child sits down on one end of a horizontal seesaw of negligible weight, 1.96 m from the pivot point. No one balances on the other side. Find the instantaneous angular acceleration of the seesaw and the tangential linear acceleration of the child.
asked by john hide on April 3, 2018 
PHYSICS
There is a mass at the end of a 0.6 m string, being swung around overhead at constant acceleration of(3/4)pi rad/sec^2. mass is 39.84 G. Tensile strength is 12.4 newtons need to find how many revolutions there will be before the string breaks, and the time
asked by Jan on February 28, 2013 
College Physics
If one micrometeorite (a sphere with a diameter of 1.8 106 m) struck each square meter of the Moon each second, estimate the number of years it would take to cover the Moon with micrometeorites to a depth of one meter? Find how long it would take to fill
asked by Myriam on January 18, 2011 
math
Numbers that are palindromes read the same forward and backward. For example, 30203 is a five digit palindrome. If a single number is chosen randomly from the set of all threedigit numbers, find the probability that it will be palindromic. Answer 1/10??
asked by timmy on April 14, 2015 
Physics
When a man in a cage whose weight is 1000N pulls a rope that is attached on a cage around a fixed pulley,the force he exerts on the floor of the cage is 450N ,if the cage weigh 250N ,find the acceleration
asked by Pretender on March 12, 2013 
physics
when a chameleon captures an insect its tingue car extend 16 cm in 0.10 s. (a) Find the magnitude of the tongue's acceleration, assuming it to be constant.(b) In the first 0.050 s, dones the tongue extend 8.0 cm, more than 8.0 cm, or less than 8.0 cm?
asked by taylor on November 18, 2011 
math
The stiffness of a given length of beam is proportional to the product of the width and the cube of the depth. Find the shape of the stiffest beam which can be cut from a cylindrical log (of the given length) with crosssectional diameter of D
asked by manjeet on April 7, 2018 
science
a stone is thrown at an angle of 30* with the horizontal direction which strikes the tip of the building 2 m height ,if the distance of the building from the point of observation is 10 metre .find the velocity of the projectile of the stone. ans...
asked by nirmal kumar on November 4, 2016 
social studies
is this correct and true? Why did Jefferson send Lewis and Clark on an expedition out west? 1. To explore the Louisiana purchase 2. Find the northwest passage 3. To research the plants and animals of the Louisiana Purchase
asked by Jenny on January 21, 2014 
science
A marble at rest is dropped from the top of a building. Find the marble’s velocity after it has fallen for 3 s. Ignore air resistance. Use the formula: v = g x t, where v = average velocity, g = acceleration due to gravity and t = time
asked by Charlies Timbs on March 23, 2017 
English composition
1. We can print out the script so that we may study English sentences. 2. We can find a lot of useful writings in the English textbooks. 3. Speaking to oneself is a good way to improve speaking abilities. ================================= Thank you for
asked by John on October 22, 2007 
Chemistry
The antifreeze in a car is a 50% by weight solution of ethylene glycol, C2H6O2 in a water solvent. Calculate the boiling point and freezing point of this solution. (For H2O, Kb=0.52 C/m Kf= 1.86 C/m I can't even find the formula for this in my book, please
asked by Christine on January 24, 2013 
Chemistry
How much heat (in kilojoules) is evolved or absorbed in the reaction of 2.90g of Fe2O3 with enough carbon monoxide to produce iron metal? Fe2O3 + 3CO > 2Fe + 3CO2 dH=24.8kJ How do you find q (of the 2Fe in kJ).
asked by Chris on April 6, 2011 
Chemistry
Aspirin is a weak acid with a Ka of 3.0x10^5. Find the pH of a solution by dissolving .65g of aspirin in water and diluting it to 50mL. You can use RCOOH to represent aspirin. Molecular weight of aspirin is 180g/mol
asked by Jessica on November 26, 2011 
calculus
in a time of t seconds, a particle moves a distance pf s meters from it's starting point, where s=3t^2 Find the ave velocity between t =1 and t=1+h if.... a) h=.1 b)h+.01 c)h=.001 Which approximation is closest to the EXACT derivative at ...t=1? Estimate
asked by anthony on February 17, 2011 
algebra
Problem Page The volume V of a fixed amount of a gas varies directly as the temperature T and inversely as the pressure P. Suppose that V=42 cm to the 3,when T=84 kelvin and P= 8kg over cm squared. Find the temperature when V=74 cm cubed and P= 10 kg over
asked by rebecca on March 14, 2017 
Physics
a point 22 caliber rifle fires a 1.8 gram bullet at a 400m/s into a block of wood. If the bullet penetrates to a depht of 10cm find the desaceleration of the bullet. The force exerheted on the bullet, and the time.
asked by Guelmy on November 5, 2014 
Calculus
Verify that the function satisfies the three hypotheses of Rolle's Theorem on the given interval. Then find all numbers c that satisfy the conclusion of Rolle's Theorem. (Enter your answers as a commaseparated list.) f(x) = sqrt(x) − (1/9)x, [0, 81] c=?
asked by Anonymous on May 11, 2018 
Economics
Suppose a firm faces a downward sloping demand curve givven by the equation 1=1001/3P. The firm's cost function is given by the equation C=30+1/4Q^2. Find the profit maximizing level of output.
asked by mandy on October 19, 2007 
math
A bank offers a 24month installment loan with an APR of 10%. Alicia wishes to use the loan to finance a sailplane for $42,800. After first using Table 131 to find the finance charge, calculate the monthly payment.
asked by Ricky on May 15, 2018 
math
The number of days, d, it takes for a construction crew to repave a certain road varies inversely as the number of workers, w, that work on the project. So my equation is d = k/w If w = 16, how do I find d? d = k/16 Also, why is Y = 2x^2 + 3√x not a
asked by Carly on November 9, 2016 
psychology (information booklet)
I am required to do an information booklet on Cognitive Development in Childhood by Jean Piaget. What should be put inside this information booklet? Where can I find journals, pictures and other materials regarding this topic on the internet? Your help is
asked by mic_ on June 29, 2009 
college
Find the 90% confidence interval for the variance and the standard deviation of the ages of seniors at Oak Park College if a sample of 24 students has a standard deviation of 2,3 years. Assume the variable is normally distribution
asked by bjacobs on February 16, 2011 
math
A boat traveling downstream a distance of 39 miles then came right back.If the speed of the current was 12 mph and the total trip took 4 hours 20 minutes,find the average speed of the boat relative to the water.
asked by russ on February 1, 2014 
Math
The IQ scores are normally distributed with a mean of 100 and a SD of 15. A) What is the probability that a randomly person has an IQ b/t 85115? Show work B) Find the 90th percentile of the IQ distribution? C) If a random sample of 100 people are
asked by Sandy on March 8, 2013 
PHYSICS
There is a mass at the end of a 0.6 m string, being swung around overhead at constant acceleration of(3/4)pi rad/sec^2. mass is 39.84 G. Tensile strength is 12.4 newtons need to find how many revolutions there will be before the string breaks, and the time
asked by Jan on March 3, 2013
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