# Jon

Popular questions and responses by Jon-
## Physics

A child throws a snowball at a tree and it sticks to the tree. Does this motion defy the Law of Conservation of Momentum? Explain. I'm thinking yes. Given that p(momentum)= mass x velocity, even though the tree is stationary, it would have a much greater

*asked on November 9, 2009* -
## Physics

A 60.0 kg girl stands up on a stationary floating raft and decides to go into shore. She dives off the 180 kg floating raft with a velocity of 4.0 m/s [W]. Ignore the substantial friction real objects in water experience. a) What is the momentum of the

*asked on November 9, 2009* -
## Physics

A 0.500 kg block is sitting on a horizontal, frictionless surface. The block is connected to a horizontal spring with a force constant of 124 N/m. The other end of the horizontal spring rests against a wall. When a 100.0 g arrow is fired into the wooden

*asked on November 19, 2009* -
## physics

A ball is thrown horizontally at 10.0 m/s from the top of a hill 50.0 m high. How far from the base of the hill would the ball hit the ground? I don't understand the following explained by Quittich (sp)? "Since there is no vertical component, the time to

*asked on April 2, 2008* -
## math

In a company there are 7 executives: 4 women and 3 men. 3 are selected to attend a management seminar. Find these probabilities. A) All 3 selected are men B) all 3 selected are women C) 2 men and 1 woman will be selected. D) 1 man and 2 woman will be

*asked on April 1, 2009* -
## Chemistry

Baking powder is stoichiometrically matched between baking soda and tartaric acid, and 1/3 of the mass of baking powder is baking soda -- this is because the molecular weight of cream of tartar is roughly twice that of baking soda. If the density of baking

*asked on May 12, 2020* -
## Physics

Two identical +9.0 µC point charges are initially spaced 5.2 cm from each other. If they are released at the same instant from rest, how fast will they be moving when they are very far away from each other? Assume they have identical masses of 1.0 mg.

*asked on February 25, 2012* -
## Science

If the specific heat of a marshmallow is 2 J/g, how much heat is given off when it cools from room temp (25C) to its liquid nitrogen bath. Weight of the marshmallow 7.4g

*asked on July 14, 2015* -
## Trig(3 all with work)

1)Find the exact value of cos 105 by using a half-angle formula. A)sqrt 2 - sqrt 3 /2 B)-sqrt 2 - sqrt 3 /2 C)-sqrt 2 + sqrt 3 /2 D)sqrt 2 + sqrt 3 /2 cos 105 cos 105 = cos 210/2 sqrt 1 + 210/2 sqrt 1 + sqrt 3/2 /2 sqrt 2 + sqrt 3/2 which is D 2)Find the

*asked on February 15, 2008* -
## USC

which of the following is true of quotation marks?

*asked on December 28, 2012* -
## Physics - PLEASE HELP

A rod is 2.40 m long and has a diameter of 2.50 mm. A force of 2000 N is applied to the end to stretch the rod by 1.00 mm. What is the tensile modulus for this rod? 7.50 × 1011 N/m2 8.70 × 1011 N/m2 9.78 × 1011 N/m2 10.2 × 1011 N/m2 10.8 × 1011 N/m2

*asked on November 10, 2013* -
## college math

A jet leaves a runway whose bearing is N26E from the control tower. After flying 4 miles, the jet turns 99 degrees and flies on a bearing of s55e for 6 miles. At that time what is the bearing from the jet from the control tower. I have no idea how to solve

*asked on May 9, 2009* -
## Calculus

A section of highway connecting two hillsides with grades of 6% and 4% is to be build between two points that are separated by a horizontal distance of 2000 feet. At the point where the two hillsides come together, there is a 50-foot difference in

*asked on December 4, 2007* -
## math

Robert spins the spinner and rolls a standard number cube. Find the probability that the spinner will stop on purple and the cube will show a six. The spinner has six equal slices, 1 purple, 3 green, 1 yellow, 1 red.

*asked on April 11, 2017* -
## Language

What does the word keen mean in australian?

*asked on December 19, 2007* -
## CHEMISTRY HELP!

Consider the following reactions and their equilibrium constants. (NO(g) + 0.5Br2(g) NOBr(g) Kp = 5.3 2NO(g) N2(g) + O2(g) Kp = 2.1 x 1030 Use these equations and their equilibrium constants to determine the equilibrium constant for the following reaction:

*asked on April 27, 2011* -
## chemistry

The specific heat of ice is 0.5 calories/gram. 60 grams of ice will require _____ calories to raise the temperature 1°C. so i just do 0.5/60 ??

*asked on November 17, 2010* -
## Physics

1)Which of the following statements is true about electric forces? A)electric forces cause objects to only attract each other. B)electric forces cause objects to only repel each other C)electric forces cause objects to repel or attract each other

*asked on April 9, 2008* -
## math

1)Find the sixth term of the geometric sequence for which a1=5 and r=3 A)1215 B)3645 C)9375 D)23 I chose A 2)Write an equation for the nth term of the geometric sequence -12,4,-4/3... A)aN=-12(1/3)n-1 B)aN=12(-1/3)n-1 C)aN=-12(-1/3)-n+1 D)aN=-12(-1/3)n-1 I

*asked on December 12, 2007* -
## Physics

A 0.500 kg block is sitting on a horizontal, frictionless surface. The block is connected to a horizontal spring with a force constant of 124 N/m. The other end of the horizontal spring rests against a wall. When a 100.0 g arrow is fired into the wooden

*asked on November 19, 2009* -
## physics

A student lifts a 1.2 kg bag from her desk, which is 0.59 m high, to a locker that is 2.9 m high. What is the gravitational potential energy of the bag relative to the desk? PE=mgh 1.2(9.80)(2.9) = 34.1

*asked on April 3, 2008* -
## physics repost

A player kicks a football with an initial velocity of 3.00 m/s at an angle of 60.0 above the horizontal. What is the horizontal distance traveled by the football? 2(3.00)(cos60)/9.80 (3.00)(cos60)(.530219635) 0.795m ___________________________________ "The

*asked on April 3, 2008* -
## physics

A missile launched at a velocity of 30.0 m/s at an angle of 30.0 to the normal. What is the maximum height the missile attains? sin 60 = 0.866025404 0.866025404 x 30 = 25.98076211 25.98076211 x 25.98076211 / 2 / 9.8 = 34.4 m

*asked on April 2, 2008* -
## Calc

A rotating beacon is located 1 kilometer off a straight shoreline. If the beacon rotates at a rate of 3 revolutions per minute, how fast (in kilometers per hour) does the beam of light appear to be moving to a viewer who is 1/2 kilometer down the

*asked on November 11, 2007* -
## Gen Chem

At elevated temperatures, solid silicon reacts with chlorine gas to form gaseous SiCl4. At some temperature, the equilibrium constant for this reaction is 0.30. If the reaction is started with 0.10 mol of SiCl4 in a one-liter flask, how much Cl2 will be

*asked on February 29, 2012* -
## Math

A man goes 7m east and then 24m to south. Find his distance from the starting point

*asked on December 28, 2016* -
## Maths

Two identical jars are filled with mixtures of water and vinegar in the ratios of 2 to 1 and 3 to 1 respectively. If both jars are emptied into another container then the ratio of water to vinegar in the resulting mixture is.

*asked on November 8, 2016* -
## chem

if a fractional distillation failed to separate two components efficiently, what alternatives would one consider to effect clean separation by distillation?

*asked on October 7, 2011* -
## science

The current classification system used by biologists is: A)Complex and unchanging. b)universally accepted by all biologists c)based on four generalized types of living organism: the bacteria, archaea, eukarya and protista d) updated and revised whenever

*asked on September 17, 2011* -
## chemistry

Silver chloride can be prepared by the reaction of 100mL of 0.20M silver nitrate with 100mL of 0.15M calcium chloride. after the reaction goes to completion, what concentration of which ion remains in solution?

*asked on March 13, 2011* -
## Physics

A cheetah can maintain its maximum speed of 120 km/hr for 38 seconds. What minimum distance must a gazelle running 74 km/hr be ahead of the cheetah to escape? A) 417.2 m B) 3778 m C) 624.3 m D) 485.6 m E) 1748 m

*asked on September 23, 2010* -
## Chemistry

Sulfur trioxide dissolves in water, producing H2SO4. How much sulfuric acid can be produced from 12.1 mL of water (d=1.00g/mL) and 22.1 g of SO3?

*asked on October 8, 2009* -
## Chemistry

Toy ovens made for children often use incandescent light bulbs as a heat source. Incandescent light bulbs are relatively inefficient at generating light. Approximately 95% of the energy they use is emitted as heat instead of light: that's bad for the

*asked on May 12, 2020* -
## Trig

find the equation for the cosine function that has an amplitude of 3/5, a period of 3pi/2 and a y-intercept of 5.

*asked on May 3, 2016* -
## physics

If a small planet were discovered whose orbital period was twice that of Earth, how many times farther from the Sun would this planet be?

*asked on May 9, 2015* -
## Science

A spherical rock rests at the top of a steep hill. the rock has A)Potential Energy B) Chemical energy C)Kinetic energy or D) no energy i think it's A or B but I'm not sure. thanks

*asked on October 14, 2011* -
## Physics

You have a circuit with a 4 uF capacitor connected in series to 2 capacitors connected in parallel (2 uF and 1.5 uF). The battery is 12 V. The first question asked what the circuit's equivalence capacitance was. I calculated it to be 1.9 uF, which is

*asked on February 19, 2011* -
## Chemistry 3

For each of the following sublevels, give the n and l values and the number of orbitals. (a) 3s (b) 5f (c) 5g

*asked on September 15, 2010* -
## Chemistry 2

How many orbitals in an atom can have each of the following designations? (a) 3p (b) n=1

*asked on September 15, 2010* -
## Physics

A 60.0 kg girl stands up on a stationary floating raft and decides to go into shore. She dives off the 180 kg floating raft with a velocity of 4.0 m/s [W]. Ignore the substantial friction real objects in water experience. a) What is the momentum of the

*asked on November 10, 2009* -
## Algebra 2

1)Find the exact solutions of the system of equations x^2 + 2y^2 = 18 and x = 2y. x=2y x^2+2y^2=18 (2y)^2+2y^2=18 4y^2+2y^2=18 6y^2=18 y^2=3 y=+-ã3 x=2(+-ã3) x=+-2ã3 (+-2sqrt3,+-sqrt3) 2)Simplify, (d/(d^2-9)) + (5/(2d+6)) [d / (d^2 - 9)] + [5 /

*asked on May 20, 2008* -
## Algebra 2

an ice cream store has 31 flavors of ice cream and 10 toppings. A regular sundae has one flavor of ice cream, one topping, and comes with or without whipped cream. How many different ice cream sundaes can be ordered? I'm thinking 310 but how do i figure it

*asked on December 15, 2007* -
## FINANCE

Below is a list of account balances for Currie Hospital as of December 31, 2013. Prepare a balance sheet as of December 31, 2013, in proper form. (Hint: You will need to compute the net assets account. Assume that all net assets at the beginning of the

*asked on March 15, 2015* -
## Accounting

The GoodTaste Club collected recipes from members and published a cookbook entitled Eat 'Em Up. The book will sell for $18 per copy. The chairwoman of the cookbook development committee estimated that the club needed to sell 14,600 books to break even on

*asked on March 8, 2015* -
## Physics

If 200g of water at 20˚ C is combined with 100g of water at 80˚ C, what is the final temperature of the 200g of water? How do you do this??? steps by steps??

*asked on February 7, 2011* -
## Physics

A block with mass M rests on a frictionless surface and is connected to a horizontal spring of force constant k, the other end of which is attached to a wall. A second block with mass m rests on top of the first block. The coefficient of static friction

*asked on January 12, 2011* -
## IPC

Suppose all of the apples have a mass of 0.10 kg. If apple (A) is sitting on the ground, what is its potential energy? A) 0.10 J B) 9.8 J C) 0.0 J D) 1.0 J Would it be A?

*asked on December 8, 2010* -
## Physics

1)When the currents in two parallel metal conductors are in the same direction, the conductors ___ each other. A)attract B)repel C)do not exert any force D)exert forces that are perpendicular to I got A. I couldn't find where it talks about directions of

*asked on April 11, 2008* -
## physics

The melting point of a solid is 90.0 d/C. What is the heat required to change 2.5 kg of this solid at 40.0 d/C to a liquid? The specific heat of the solid is 390 J/kg-K and its heat of fusion is 4000 J/kg. I got 2 different answers 2 different ways:

*asked on April 3, 2008* -
## physics repost

Venus has radius 6.05 x 10^6 m and mass 4.87 x 10^24 kg. Calculate the value of acceleration due to gravity on Venus's surface. don't know this one

*asked on April 3, 2008* -
## Therrell

When measuring distance 12 beads are Approxmately equal to 6 erasers. How many erasers are equal to 18 beads? How many beads equal to 42 erasers?

*asked on December 4, 2015* -
## Algebra

Joan Arlington has twice as much money invested at 5% simple annual interest as she does at 4%. If her yearly income from the two investments is $378, how much does she have at each rate?

*asked on March 5, 2013* -
## Algebra

In a recent school board election, the two candidates for president received 2590 votes. The loser received 1302 fewer votes than the winner. How many votes did the winner receive?

*asked on March 5, 2013* -
## Algebra

Mrs. Boyd has a desk full of quarters and nickels. If she has a total of 31 coins with a total face value of $4.55, how many of the coins are nickels?

*asked on March 5, 2013* -
## algebra

Regrind, Inc. regrinds used typewriter platens. The cost per platen is $1.70. The fixed cost to run the grinding machine is $267 per day. If the company sells the reground platens for $4.70, how many must be reground daily to break even?

*asked on March 5, 2013* -
## Math

Write an inequality for the expression fourteen more than a number is at least 9. a. f+14†9 b. 14f†9 c. f+9†14 d. f-14†9

*asked on March 12, 2012* -
## algebra

An airplane encountered a head wind during a flight between Rontown and Sawburgh which took 4 hours and 24 minutes. The return flight took 4 hours. If the distance from Rontown to Sawburgh is 1700 miles, find the airspeed of the plane (the speed of the

*asked on February 8, 2012* -
## CHEMISTRY

Which of the following solutions contain the greatest total ion concentration? a) one mole of potassium chloride dissolved in 1.0L of solution b)one mole of sodium phosphate dissolved in 1.0L of solution c)one mole of ammonium carbonate dissolved in 1.0L

*asked on March 13, 2011* -
## Biology

A cell that is entering the M phase of the cell cycle is: A. always diploid, either with duplicated or unduplicated chromosomes B. always haploid, always with duplicated chromosomes C. either haploid or diploid, always with duplicated chromosomes D. either

*asked on December 2, 2010* -
## to divide Monomials

Please help me with my paper algebra with Pizzazz! Page 76, objective 3-a. Name of paper is Why are babies like hinges?

*asked on April 16, 2009* -
## Physics

1)Four resistors of 10.0 each are connected in parallel. A combination of four resistors of 10.0 each is connected in series along with the parallel arrangement. What is the equivalent resistance of the circuit? A)80.0 B)40.4 C)40.0 D)42.5 I got C 2)A 2.00

*asked on April 9, 2008* -
## physics

1)A 5.0 cm real object is placed at a distance of 30.0 cm from a concave mirror of focal length 10.0 cm. Find the location of the image. (30)(10)/5.0 15 or (30)(5.0)/10 60 I don't know which one 2)What must be the minimum height of a plane mirror so that a

*asked on April 7, 2008* -
## Math

Find the first five terms of the sequence for which a1=5,and an+1=3an+1. an+1=3an+1 a1+1=3a1+1 a2=3(5)+1 a2=16 a2+1=3a2+1 a3=3(16)+1 a3=49 a3+1=3a3+1 a4=3(49)+1 a4=148 a4+1=3a4+1 a5=3(148)+1 a5=445 so the first five terms are: 5,16,49,148,445

*asked on March 4, 2008* -
## Math

1)The sum of a number and 17 more than twice the same number is 101. Find the number. 17+2n=101 17-17 101-17 2n=84 n=42(answer) 2)Evaluate: 5-/a+5b/ if a=-12 and b=2. 5-/-12+5(2)/ 5-/-12+10/ 5-/-2/ 5-2 3(answer)

*asked on February 24, 2008* -
## math

1)In triangle ABC, C=60 degrees, a=12, and b=5. Find c. A)109.0 B)10.4 C)11.8 D)15.1 I chose B 2)Which triangle should be solved by beginning with the Law of Cosines? A)A=115 degrees, a=19, b=13 B)A=62 degrees, B=15 degrees, b=10 C)B=48 degrees, a=22, b=5

*asked on February 11, 2008* -
## Probabilty/Statistics

1)A coin is tossed 5 times. Find P(at most 4 tails.) A)3/16 B)13/16 C)1/32 D)31/32 I chose D 2)How many different arrangements of the letters of the word doodle are possible? A)180 B)720 C)15 D)90 I chose B For #3-5, use the following tepereatures from

*asked on February 8, 2008* -
## Algebra II

A furniture company displays bedroom sets which require 21 square meters of space and living room sets which require 42 square meters of space. The company which has 546 square meters of available space,wants to display at least 6 bedroom sets and at least

*asked on December 18, 2007* -
## marketing

Suppose I have developed a system for removing carbon dioxide, from the emissions of combustion process. But this process is expensive so that it would not be instantly adopted by all countries. I have to choose a country to start up this business. can you

*asked on September 6, 2007* -
## Economics

Suppose the price elasticity of demand for heating oil is 0.2 in the short run and 0.7 in the long run. c. If the price of heating oil rises from $1.80 to $2.20 per gallon, what happens to the quantity of heating oil demanded in the short run? In the long

*asked on October 6, 2006* -
## chemistry-net ionic equations

Whats the net ionic equation for the decomposition of hydrogen peroxide (H202)? I know that it decomposes into water and O2 but is H202->H20+O2 the net ionic or does the H2 and O2 split up to be H2 + O2 -> H20+O2 and if so is the net ionic then just

*asked on August 28, 2005* -
## Math

In a card game, each player is dealt 5 cards. Make a table to show the total number of cards dealt for each number of players from 3 to 6. Write each ratio of players to cards dealt.

*asked on May 19, 2020* -
## Calculus

A science project studying catapults sent a projectile into the air with an initial velocity of 24.5 m/s. The formula for distance (s) in meters with respect to time in seconds is s = -4.9t2 + 24.5t. Find the time that this projectile would appear to have

*asked on April 16, 2020* -
## English

Can you please tell me what part of speech is the word marshmallow in the following sentence? "We made marshmallow snowmen in class."

*asked on January 8, 2020* -
## chemistry

1. You are given a mixture containing two compounds, A and B. Both compounds have a solubility of 1 g/ 100 mL of solvent at 20 °C and 16 g/ 100 mL of solvent at 100 °C. The sample is composed of 3.5 g of A and 10 g of B. At 100 °C the entire sample just

*asked on March 2, 2015* -
## social studies

what is the greatest challenge facing people in turkey as a result of its diversity? 1. Turks must protect their status as the largest ethnic group 2. Turks must encourage other to follow Turkish traditions 3. Kurds must struggle to keep their cultures

*asked on March 2, 2015* -
## Chemistry

As a purity check for industrial diamonds, a 22 - carat diamond (1 carat = 0.2g) is heated to 63 degrees C and immersed in 26g of water in a constant pressure calorimeter. The initial temperature of the water is 23 degrees C. Calculate the ΔT of the water

*asked on January 12, 2015* -
## Chemistry

2C2H2(g) + 3O2(g) 4CO(g) + 2H2O(g) What is delta G° for this reaction in J/mol? (T = 298.17 K)

*asked on January 12, 2015* -
## probability

We have two fair three-sided dice, indexed by i=1,2. Each die has sides labelled 1, 2, and 3. We roll the two dice independently, one roll for each die. For i=1,2, let the random variable Xi represent the result of the ith die, so that Xi is uniformly

*asked on February 27, 2014* -
## Math

Which isn't equivalent: 3/7, 6/14, 8/21 or 12/28

*asked on January 27, 2013* -
## calculus

Find the equation of the tangent line to the curve y=sqrt(x) at x = c. Put the answer in slope intercept form y=mx+b. Use the definition of the slope of the tangent with no short cuts.

*asked on January 31, 2012* -
## Chemistry

How many grams of NaCl should be added to 1 L of water to make an isotonic solution? (molecular weight of NaCl= 58.5) Can someone please explain to me why the answer is 9 grams.

*asked on January 30, 2012* -
## Science

Hi i have 3 questions I need help with please. Electrons are found A) in the nucleus of an atom. B) only in complex molecules. C) in a shell that surrounds the atom’s nucleus. D) in both the nucleus and inner shell of an atom. I think it's D. Individual

*asked on October 1, 2011* -
## Physics

A parallel-plate capacitor is constructed from two circular metal plates or radius R. The plates are separated by a distance of 1.2mm. 1. What radius must the plates have if the capacitance of this capacitor is 1.1 uF? 2. If the separation between the

*asked on February 21, 2011* -
## chem

The bottom of a box has a surface area of 31.4 cm2. The mass of the box is 47.1 kilograms. Acceleration due to gravity at sea level is 9.80 m/s2. What pressure is exerted by the box where it rests? how do i solve this?

*asked on November 18, 2010* -
## Music

European countries used different styles of colonial rule in the Caribbean. How did differences in colonial rule affect musical development in the Caribbean? Please help me with this question, I am getting really frustrated and don't know how to answer it.

*asked on November 8, 2010* -
## Math

please go step by step to better understand if 2f(x)+f(1-x)=x^2 for all real numbers, the f(x)=?

*asked on October 26, 2010* -
## physics

How center mass affects an arrows distance traveled (include source)

*asked on April 18, 2010* -
## Math

Write the standard form of the equation of the circle that passes through (0,4) and has its center at (-3,-1). (x-h)^2 + (y-k)^2 = r^2 (x+3)^2 + (y+1)^2 = r^2 r^2 = d d = sqrt(x2-x1)^2 +(y2-y1)^2 d = sqrt(-3-0)^2 + (-1-4)^2 d = 3^2 + -5^2 d = sqrt34

*asked on April 22, 2009* -
## Business Plan

I am in need of some help in writing a business plan for a fashion, video game and web design company. The plan will include all the above put together because it's the same company. I know I need: 1)Executive Summary 2)Company Overview 3)Marketing and

*asked on April 13, 2009* -
## organic chemistry

What is the newman projection of meso-2,3-dichlorobutane?

*asked on July 24, 2008* -
## Physics

1)The velocity of sound in air is 332 m/s. If the unit of length is km and the unit of time is hour, what is the value of velocity? m/s bobpursley said he would be happy to check my work but I don't know what they're looking for I thought they are looking

*asked on April 15, 2008* -
## Physics check

1)What can you say about the motion of a body if: a. its displacement-time graph is a straight line inclined with the time axis b. its velocity-time graph is a straight line inclined with the same axis. c. its velocity- time graph is a parabola A)The

*asked on April 14, 2008* -
## Physics repost

A current of 5.0 A flows for 20.0 minutes through a bulb and delivers 15000 J of electric energy to the bulb. What is the potential difference across the bulb? A)2.5 V B)4 V C)100 V D)100 V (book typo) I was told to do this: energy= V*I*time in seconds

*asked on April 9, 2008* -
## Physics(Thank you)

1)Which of the following objects can set fire to a piece of paper in the presence of sunlight? A)doulble concave lens B)convex lens C)convex mirror D)concave lens B, convex lens 2)What happens to a path of a light ray parallel to the principle axis, after

*asked on April 8, 2008* -
## Physics

1)A 5.0 cm real object is placed at a distance of 5.0 cm from a concave mirror of focal length 10 cm. Find the size of the image. di= -10 magnification = |di/do| magnification = |-10/5.0| magnification = 2 image size = (object size)*(magnification) image

*asked on April 8, 2008* -
## Physics

True/False 1)Specular reflection obeys the laws of reflection while diffuse reflection does not. False. drwls said its true but I disagree can you please explain. 2)A convex lens is used to obtain an enlarged virtual image. True.

*asked on April 8, 2008* -
## physics

1)For incomplete cancellation to occur, opposite pulses must have. A)equal amplitudes B)different energies C)equal pulses D)equal displacements I think there is a typo on A because my book reads: if the opposite pulses have unequal amplitudes, cancellation

*asked on April 6, 2008* -
## physics

7)In calculating the force of gravity between two objects, if the mass of one object increased by 4 and the other by 2, how many times would the force of gravity increase? I don't really understand but I got 6 times 8)In calculating the force of gravity

*asked on April 1, 2008* -
## Trig

Should the triangle be solved beginning with Law of Sines of Law of Cosines. Then solve the triangle. Round to the nearest tenth. A=56 degrees, B=38 degrees, a=13. Sines. I get confused on the formula. I know C=86 degrees

*asked on March 7, 2008* -
## Trig

Find the exact value of: sin405. reference angle=225 sin225= -.707106781 = -.71

*asked on March 6, 2008*