
chem lab
0.8100g MgO(s)(40.3g/mol) was reacted with 52.3 ml 1.00M HCl(density= 1.00g/ml) in the coffee cup calorimeter, and the observed temperature change was +10.4 degree Celsius. write the equation for this reaction, determine the limiting reactant and find
asked by mann on February 12, 2014 
physics
A block of mass 1.4kg is placed on a rough surface. the coefficient of friction between the surfaces is 0.58. A constance force of magnitude 10N, making an angle of 37 degrees with the horizontal is acting on the block. the block is given an initial
asked by usha on September 10, 2011 
Mathematics
A cowtrough has a triangular crosssection of height 25cm and base 30cm and is 2m long. A cow is drinking steadily, and when the water level is 5cm below the top it is being loward at the rate of 1cm/min. Find the rate if consumption in litres per minute.
asked by Amos on September 16, 2015 
Algebra 2
A random sample of 5000 people was chosen for a survey. 54% of them said they didn't have children under 18 living at home. Find the 95% confidence interval. Round answer to 4 significant digits and give lowest and highest values of confidence Interval. I
asked by Anonymous on December 2, 2015 
Anatomy
Our biology class is studying the human skeletal system this month, and I need to find some information on the fone bone for my report. Can anyone help me out? Thank you for using the Jiskha Homework Help Forum. Is some one joking with you? "Fone Bone" is
asked by Ali on March 20, 2007 
can someone please help w/ physics?
An object of mass 154 kg moves in a smooth straight tunnel of length 2990 km dug through a chord of a planet of mass 3.19 × 10^24 kg and radius 1 × 10^7 m Find the eﬀective force constant of the harmonic motion. The value of the universal gravitational
asked by michelle on November 16, 2012 
statistics
A politician claims that she will receive 66% of the vote in an upcoming election. The results of a properly designed random sample of 145 voters showed that 80 of those sampled will vote for her. Is it likely that her assertion is correct at the 0.01
asked by Err on December 4, 2014 
chemistry
A. Find and list all of the different half cell combinations. Hint 15 combinations! 1. Copper/ Cu2+ 2. Lead/ Pb2+ 3. Magnesium/ Mg2+ 4. Zinc/ Zn2+ 5. Iron/Fe2+ 6. Aluminum/ Al3+ B. write the half reactions of each combination and the overall redox
asked by Chloe on May 8, 2013 
Trigonometry
Help : To achieve similar weightlessness as NASA's centrifuge, ride the Gravitron at a carnival or fair. The Gravitron has a diameter of 14 meters and, in the first 20 seconds, it achieves zero gravity and the floor drops. Gravitron. If the gravitron
asked by Mags on October 4, 2009 
Physics
A copper (shear modulus 4.2 x 1010 N/m2) cube, 0.331 m on a side, is subjected to two shearing forces, each of magnitude F = 2.17 x 10 6 N (see the drawing). Find the angle (in degrees), which is one measure of how the shape of the block has been altered
asked by Abigail on May 1, 2019 
Math(statisc)
Select a variable (mean, proportion, variance or standard deviation) of interest to you and collect data consisting of at least 30 values. Define the variable. Define the population. Describe how the sample was selected. Use Microsoft Excel (and MegaStat
asked by ibrahim on April 3, 2011 
Physics
a. A prismatic object 8 cm wide by 16 cm long is weighed in water at a depth of 20 cm and found to weigh 11 N. What is its weight in water? b. A light bulb in flashlight is labelled 2.4 V, 0.7 A. Find the equivalent resistance and the current if three of
asked by Sibusiso on May 3, 2012 
Mathematics
Find the work done in moving a particle along the quadrant circle that has radius 2, going from A = (2, 0) to B = (0, 2) in the xy plane through the force field F given by: F = (x  y)i + (x)j No diagram sorry, but the information provided does allow for
asked by Blueberry Tuffin on April 3, 2013 
chemistry
Find the unit cell (simple, bcc, fcc), type of holes where the smaller ions are found (tetrahedral, octrahedral, cubic), and number of cations and anions per unit cell for the following compounds: CdSe CsI Li2O KBr NaCl ZnS(I)
asked by jina on February 12, 2008 
maths
Puzzle Here is a list showing the month and a number for each month. January 7110 February 826 March 5313 April 541 May 3513 June 4610 July 4710 August 681 Decipher the logic and find the number for September = ?
asked by aneesh on December 16, 2014 
Final Project
I need to find 4 children songs/lyrics in between the copyright date of 20042009. I have search the Internet 4 days and I have no luck.I need 2 Spanishand 2 English version. Can someone help me please. I need this today.I have to have the name of the
asked by Cynthia on May 11, 2009 
Rate Problem / College Algebra
Kim rowed 45mph Upstream. The next day she rowed the same distance Downstream taking her 4hrs less. If she can row 7mph in still water, find the speed of the current river. **Note: this question does not state how much time she's been rowing for. That's
asked by WhenSheSmiles on October 23, 2017 
statistics
the assets (in billions of dollars)of the four wealthiest people in a particular country are 46,34,12,10. Assume that the samples of size 2 are randomly selected with replacement from this population of four values. After listing the possible sample and
asked by nannie on December 20, 2011 
Math
Arectangular lawn measuring 8m by 12m is surrounded by apaved path of constant widthw metres.The area of the path is 23m^2. Form aquadratic equation that must be satisfied by width and hence find the width of the path?
asked by Bashir Abdi on October 30, 2017 
U.S. History
I am finding information about Daniel Boone. I have did a google search, but I cannot find the answer to my question still. Would sommeone please help me out? 1. Could Daniel Boone speak Native American languages 2. In the days of Daniel Boone, what was
asked by Anonymous on September 22, 2009 
UrgentGeometry(trig part)
So I am new to sine, cosine, and tangent, so I need some help. Just explain it. No need for the answers unless you want to give it to me. :D Let triangle ABC be a right triangle with angleC=90degrees. Given the tangent of one of the complementary angles of
asked by Anonymous on March 2, 2017 
foundation of mechanics
A particle is released from rest at a point P on an inclined plane. The inclination of the plane is tan"1 (4/3) to the horizontal. If the coefficient of friction between the particle and the plane is 1/3, find i) the speed of the particle when it passes Q,
asked by khairul on December 27, 2011 
Chemistry
1. What does 'the time taken to reach completion decreases if 20cm^3 of hcl containing 4mol/dm^3' means? How to work out to find the concentration? 2(a)What does concentrated hcl means? (b)What does dilute hcl means? Which will react faster or slower / a
asked by StuartKess on October 30, 2011 
Algebra 2
Find the values of the inverse function in radians. sin^1(0.65) a. 0.71+2pi n and 0.71+2pi n b. 0.71+2pi n and 3.85+2pi n c. 0.86+2pi n and 0.86 +2pi n d. 0.61+2pi n and 2.54+2pi n 2. tan^1(0.09) a.0.09+2pi n b. no such angle exists c.1.48+ pi n d.
asked by Fading on May 21, 2017 
Maths
in an examination 50% of the studentspassedin mathematics and 70% of studentspassed in science while 10 % students failed in both subjects .300 students passed in at leastone subject .find total number of students who appeared in the examination if they
asked by Set launguage on June 25, 2018 
business and society
I need to find 3 business in my comunity: one that is formed as a sole proprietory, one that is formed as a general partnership, and one that is formed as a corportion. Identify the business and explain what characteristic of the business form led the
asked by omar on October 7, 2007 
maths
A water tank can be filled up by two pipes together in 30 minutes. One pipe fills up the tank in 32 min sooner than the other pipe when they are used separately. Find the time for each pipe to fill up the tank. Can you explain how you set up the equation
asked by kim jung hee on September 2, 2013 
calculus2
A tank is full of water. Find the work required to pump the water out of the spout. (Use 9.8 m/s^2 for g. Use 1000 kg/m^3 as the density of water. Assume r = 9 m and h = 3 m.) The tank is a spherical shape with r as the radius(9m). On top of the tank is a
asked by A on June 28, 2018 
Physics  Tension Question
A uniform bar of mass 12 kg and length 1.4 m is held by a hinge on a vertical wall. A string is attached to the end so that the bar is in mechanical equilibrium. The angle between the bar and the string is 25o. Find the tension in the string.
asked by Anon on November 11, 2016 
Finance
I calculated the following cash flows for the 5 year project. Can somone help me find the payback period?? year 0 = 80000 year 1= 75000 year2= 105000 year3= 115000 year4=115000 year5=115000
asked by Maya on July 18, 2019 
Trigonometry
Someone please help me!!! I think I've found the correct formula for this but I don't understand exactly why this is a sine function and how to find the days of the year when Portland has 11 and 15 hours of daylight. PLEASE HELP!! The equation I got was: D
asked by french accent on February 27, 2018 
math..please i need your help
Please can you help me to solve and get the solution for these problems. how to get the solution please help me for my homework. question: 1.Find the price of a 10% coupon bond with 10 years to maturity if interest rates: A) increase by 1% B) decrease by
asked by jessie on September 12, 2011 
MS.SUE PLS HELP ME
Please can you help me to solve and get the solution for these problems. how to get the solution please help me for my homework. question: 1.Find the price of a 10% coupon bond with 10 years to maturity if interest rates: A) increase by 1% B) decrease by
asked by jessie on September 12, 2011 
math
find the area of the livingroom the room is 16 feet by 10 feet by 9 feet by 13 feet
asked by Anonymous on January 30, 2012 
math
Onehalf of a number plus threefourths of the number is 2 more than fourthirds of the number. find the number .
asked by paul on August 21, 2016 
algebra
i have to find the slope and the y intercept i don't no how to do slopes f (x)=5x2 the slope is the y intercept is(0, )
asked by help on November 1, 2009 
geometry
IF THE RADIUS OF THE SPHERE IS 26 UNITS AND THE RADIUS OF POINT R IS 26 UNITS FIND CR.
asked by Anonymous on March 8, 2011 
Science,chemistry
The first ionization potential( EV) of Be and B respectively are????? Plz tell me how to find ionization potential of any element???????
asked by Hk on October 20, 2018 
math
You find 30 coins in your drawer. 20 % of the coins are nickels. How much money you have in nickels?
asked by Mely on September 5, 2010 
Algebra 1
Find an equation of the line containing the given pair of points. (1/4,1/2) and (3/4,5). What is the equation of the line? y= Thank you for all your help.
asked by Esther on January 26, 2011 
Math 116a
Find the slope and the y intercept f(x)=2x10 I have the slope as 2 and the y intercept as (0,10) I hope this is correct?
asked by Katie A on September 28, 2011 
algebra
slope of 4 and yintercept of (0,3) find slopeintercept equation that has same characteristics?
asked by lisa on September 10, 2008 
math
Find the equation of the line with the following slope and y intercept. Slope = 3, y intercept = (0, 5)
asked by Jessica on October 14, 2007 
Precalculus
Let z and w be complex numbers such that 2z  w = 25, z + 2w = 5, and z + w = 2. Find z. I need a little help with absolute values on complex numbers.
asked by Aditya on August 16, 2014 
Precalculus
Find the exact value of: Cos(inverse tan 4/3 + inverse cos 5/13)
asked by Thomas on April 21, 2014 
maths
i have got to find the perimeter of a triangle that has one side of 8x7w another that says 3x+9y and then another that says 3y+5w whats the perimeter of the triangle ??? please help
asked by sophie on January 21, 2011 
Math  Sum of a Series
Find the sum of the series 23 + 18 + 13 + . . .+ (82) A) 590 B) 590 C) 649 D) 649
asked by Robo123 on December 11, 2010 
geometry
given H is the midpoint of GI. the length of GH is represented by 4x5 and the length of HI is represented by 3x+20. find the value of x and the measures of GI, Gh, and HI.
asked by Anonymous on September 7, 2010 
precalc
Find the indicated partial sum of the series. infinity E 3(1/2)^i i=1 third partial sum
asked by bbbb on November 11, 2010 
Geometry
the measures of two complementary angles are 16z9 and 4z+3. Find the measures of the angles.
asked by dennis on September 17, 2012 
interesting log problem
log base 2n 1944 = log base n (486* (2)^1/2) find n^6
asked by maya on December 12, 2010 
PreCalculas help
I really need help Find the equation of the hyperbola 1.Vertices(4,0)(4,0) Asymptotes: y=1/3x, y=1/3x 2.Vertices(6,0)(6,0) Asymptotes: y=4/3x, y=4/3x For the first one i got ((x9)^2+y^2(x+9)^2+y^2+16=0
asked by Ryan on December 7, 2015 
algebra
Find the equation of the line With a slope of (1/3) that goes through the point (2, 4) With a slope of 3 that goes through the point (5, 1)
asked by Peter1 on January 14, 2009 
math
Find a cubic polynomial p(x) so that the solution of p(x) ≤ 0 is [2,1] or [4,∞). Is your polynomial the only one that gives this solution? Explain.
asked by Cat on March 8, 2017 
little
how do u find base times the height? You multiply the base and the height together.....
asked by bre on February 22, 2007 
math
The sum of two numbers is equal to 63 and their difference is equal to 12. Find the numbers.
asked by annie on March 17, 2017 
Math
Missing exponent of 1/169=(1/13) please explain how I can find the missing exponent
asked by Brian on December 15, 2015 
Calculus!!
Using the identity: L{f(t)/t}=integral F(p)dp (s >infinity), find the integral of: sin(t)/t dt (0>infinity)
asked by Sara on July 28, 2013 
Geometry
Midpoint of segment UV is 5 + 11 the coordinates of one endpoint are you three and five find the coordinates of endpoint V
asked by Anonymous on September 1, 2016 
algebra
Find an equivalent expression with the given denominator 4/n=?/n 2power. The expression that is equivalent to 4/n is
asked by Maria on June 17, 2011 
trig
please help me. use trig. identities to find the exact value. tan 25° + tan 5° / 1 tan 25° tan 5°
asked by ann on April 30, 2010 
algebra
Find the horizontal asymptote of the graph of y=4x^6+6x+3 / 8x^6+9x+3 please explain i think there is no horizontal asymptote
asked by lee on January 30, 2013 
Tilili
Let Vector "A" Cross With Vector "B" Equal To Ten,then Find (A+B) Cross With (AB) ?
asked by Dereje on December 13, 2015 
Calculus
Find the indicated one sided limits of f. f(x)= (x^2+8)/(x^225) what is the limit as x goes to 5+(from the right side)? What is the limit as x goes to 5+(from the right side?
asked by Anonymous on January 25, 2013 
Math
The shopkeeper has 75 3/4 kg of sugar and sold 1/4 of it, find the amount of sugar sold.
asked by Deepak on April 27, 2018 
Maths
The differencein the measures of 2 complementary angles is 18.Find the measures of angles.
asked by anonymus on December 2, 2011 
Calculus
Let f(x)=x^2+3x on the interval [1,3]. Find the absolute maximum and absolute minimum of f(x) on this interval.
asked by Anonymous on August 5, 2013 
geometry
Y is a point on HR with HO=(19x) miles and OR=48 miles. If HR=(27x) miles, find HO (in miles)
asked by sam on September 16, 2012 
8th grade
Find the equation of the line With a slope of (1/3) that goes through the point (2, 4) With a slope of 3 that goes through the point (5, 1)
asked by kate on January 14, 2009 
algebra
A number is double of another number.If the difference of the number is twenty, find the number.
asked by pranjita on November 23, 2016 
Math
The Perimeter of a right angled triangle is 40 CM. Find the area of the right angled triangle.
asked by Debasish on December 22, 2015 
Calc
Let ∫7to1 f(x)dx=9,∫7to5f(x)dx=9,∫3to1f9x)dx=10. Find ∫5to3 f(x)dx=? and ∫3to5 (9f(x)9)dx=?
asked by Anon. on June 20, 2013 
math homework
find a unit vector in the direction of u u = (5, 12, 9) a. (5, 12, 9) b. 1 / squareroot 26 (5, 12, 9) c. squareroot 26 (5, 12, 9 d. 1/ 5 squareroot 10 (5, 12, 9) e. 1/ 5 squareroot 10 (5, 12, 9)
asked by lottie on August 30, 2016 
maths
The sum of two numbers Is 31.2/3 of one number is eaual to 5/8 of the other number.find the numbers
asked by mma on September 4, 2016 
PreCalculus
Given cos A = 3/5, π
asked by Anonymous on October 24, 2018 
Geometry again
Find the measure of angle T if the measure of angle T is 20 more than 4 times its supplement.
asked by Monique N. on September 27, 2009 
trig
please help me. use trig. identities to find the exact value. tan 25° + tan 5° / 1 tan 25° tan 5°
asked by ann on April 30, 2010 
Math/Algebra
Find each sum or difference (3x^2 + 7x 2)+ (2x^2  3x + 4) Answer: 5x^2 + 4x + 2 (4x + 8y) + (7y + 3x) Answer: 7x+1y (x^2 + 4x  1)+ (9x^2  8x + 9) Answer: 10x^2  4x + 8 (8x + 6)  (2x  1) Answer: 6x+ 11
asked by Cindy on March 24, 2009 
mathematics
The HCF of 2 no. Is 1/28 of their LCM.The sum of the HCF and the LCM is 116.If one of the no. Is 16 , find the other.
asked by nitya on July 30, 2014 
Algebra
I have the equation 5x + 3y = 2 and I am asked to find the rate of change. Is the rate of change 5/3?
asked by Anonymous on January 2, 2014 
math
How do you find the sum of the mode from each set of data? Set A: ( 4,9,7,2,4 ) Set B: ( 11,6,4,6,2 ) Set C: ( 3,2,9,3,3)
asked by Allison on April 23, 2014 
Algebra
Use the rational zero theorem to find all rational zeros, and use those zeros to write f(x) = 2x^4x^39x^2+4x+4
asked by Arneta on October 10, 2015 
Algebra I
Did I do these probelms correctly? Find the intercepts 1. y^2 = x^2  4x y^2 = x(x  4) Y intercepts y^2 = 0(0  4) (0,0) x intercepts 0 = x(x  4) 0 = x  4 4 = x (4,0) 2. y = (x (x + 3))/(3x + 1)^2 y intercetps y = (0(0 + 3))/(3(0) +1)^2 y = 3/1 (0,3) x
asked by Kate on July 21, 2010 
algebra II
Find the equation of the line With a slope of (1/3) that goes through the point (2, 4) With a slope of 3 that goes through the point (5, 1)
asked by kate on January 14, 2009 
Math
How to find the decimal equivalent of the mixed number and the mixed number is 4 2/5
asked by Suzie on April 26, 2008 
mathematics
find the equatn of a circle with (a).centre (1,2) and radius 3.(b) centre (1,3) and radius 2
asked by aminat on May 16, 2010 
Algebra
Find an equation of the line having the the given slope and containing the given point. M=4/5,(7,4) The equation of the line is y=?
asked by Pam on February 13, 2014 
math
Find the probability which odds in favor are given in problem. Odds in favor are 7 to 2. 1 0
asked by Anonymous on August 21, 2012 
geometry
One endpoint of a line segment is (8, −1). The point (5, −2) is onethird of the way from that endpoint to the other endpoint. Find the other endpoint.
asked by Mark on May 31, 2015 
math
Find the exact value of the expression. cos(π/16)cos(3π/16) − sin(π/16) sin(3π/16)
asked by Stella on June 10, 2018 
Math
Find the LCM of 11(s3) and 33(s3). LCM of 11 is 11*1 LCM of 33 is 3*11 LCM is 11*3*1=33 What do I do from here? I put down 33(s3) was the answer but I don't think that is right. Thanks for your help.
asked by B.B. on May 16, 2010 
Re
i need to find eveidence of 3 things that jesus did and 3 things jesus didn`t do. thanks!
asked by david on September 22, 2008 
geometry
in a translation, how can you use the relationship between some points and their images to find the images of other points?
asked by susan on January 28, 2009 
competition
if means '¡Á' ,'q' means'' , 'r' means ' ' 's' means '¡' then find the values of the following expression. 16s64q2p5r10
asked by sagar on November 28, 2014 
G.p.
The sum of three numbers in g.p. is 21 and the sum of their squares is 189. Find the numbers.
asked by Vijay on October 19, 2016 
algebra
I am having trouble with the following : find the slope and the y intercept of the line 7x=6y+12. I have the slope as 3 and the y intercept (0,3)
asked by Marla on September 12, 2010 
geometry
the #'s given are the coordinates of two points on a # line. find the distance between the two points. 3 and 5 what is the distance between these
asked by taz manian on September 22, 2008 
Algebra
Find the equation of the line passing through (5, 4) and parallel to the line passing through (3,2) and (6,8)
asked by Pat on November 9, 2009 
Math
find all the other zeroes of the polynomial x^4+4x^34x^232x32 if two of its zeroes are 2 root 2 and 2 root 2
asked by Prithvi on April 9, 2016 
Algebra
Find an equation of the line having the given slope and containing the given point. m=7/8, (5,6) The equation of the line is y=?
asked by Ann on May 24, 2011
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