# find the derivative of y=(3x+1)^2 y= square root 13x^2-5x+8

97,722 questions, page 736
1. ## Chemistry

I'm trying to figure out the formula for one liter of 1M K2HPO4 (Potassium Phosphate Dibasic). I know the amount of K2HPO4 is 174.18grams and you make it to equal one liter with dH2O, but I can't find where anyone has actually written the amount of dH2O to

asked by JB on June 6, 2011
2. ## Physics

A bullet is fired from a rifle that is held 2.5 m above the ground in a horizontal position. The initial speed of the bullet is 1450 m/s. Find: (a) the time it takes for the bullet to strike the ground and (b) the horizontal distance traveled by the

asked by Matt on October 17, 2014
3. ## physics

A proton that has a mass m and is moving at 250 m/s in the + direction undergoes a head-on elastic collision with a stationary oxygen nucleus of mass 16m. Find the velocities of the proton and the carbon nucleus after the collision

4. ## Algebra

I need help with a few questions, please explain. 1. Write a polynomial function in standard form with zeros -1, -1, 6. 2. Find the roots of the equation x^3 – 3x^2 + x + 5 3. Describe the number and type of roots for the polynomial (how many real and

asked by |-/ on January 31, 2018
5. ## quantitative techniques

a manufacturer of a cotter pins know that 5% of his product is defective if he sells cotter pins in boxes of 100 pins and guarantee that no more than 10 pins will be defective find the probability that a box will fail to meet the guaranteed quality

asked by saloni garg on April 14, 2015
6. ## math

A company uses the function C(x)= 20.50x+2000, where C is the cost and x is the number of units it produces, to determine its daily costs. Find the inverse of the function and determine how many units are produced when the cost is \$625,000.

asked by Anonymous on February 2, 2013
7. ## physics

Find the linear speed of the bottom of a test tube in a centrifuge if the centripetal acceleration there is 5.4×104 times the acceleration of gravity. The distance from the axis of rotation to the bottom of the test tube is 7.9cm.

asked by Anonymous on October 29, 2011
8. ## Physics C

A point charge of 5.5 µC is located at the center of a spherical shell of radius 30 cm, which has a charge −5.5 µC uniformly distributed on its surface. Given: ke = 8.98755 × 10^9 Find the electric ﬁeld for a point inside the shell a distance 12 cm

asked by D on February 1, 2012
9. ## Math

I have tried this problem a few ways, and I am getting frustrating results. Could you help me out by showing me how to set the systems of equations Two angles are complementary The sum of the measure of the first angle and 1/4 the second angle is 82.5.

asked by Sw on December 20, 2009
10. ## Math

Jared can paddle his canoe 1 mile upstream in 1 hour, but it takes only a half hour to paddle back the same distance. Find the speed of water. (Hint: d=rt and the rate or canoe speed, depending on which way he is going.)

asked by Melissa on November 2, 2012
11. ## maths --plse help me..

A man has Rs 50,000.He invests some part of it in one bank @ of 11 p.c.p.a. and the remaining money in another bank @ of 9 p.c.p.a.He gets a combined simple interest of Rs 5,400(i.e the S.I of one bank + S.I of another bank = 5,400).Then find the amount of

asked by Anonymous on December 19, 2012
12. ## physics

An electron and a proton move in circular orbits in a plane perpendicular to a uniform magnetic field. Find the ratio of the radii of their circular orbits when the electron and proton have A. the same momentum B. the same kinetic energy

asked by stoic-rider77 on February 15, 2013
13. ## calculus

Given: y^2+h^2=1 Find h as a function of y. If expression for dy/dx includes h, substitute the expression in terms of y for h. Write dy/dx in terms of y only. Show that x=[(1+sqrt(1-y^2))/y]-sqrt(1-y^2) satisfies the differential equation you found to

asked by Alex on November 3, 2012
14. ## calculus

Given: y^2+h^2=1 Find h as a function of y. If expression for dy/dx includes h, substitute the expression in terms of y for h. Write dy/dx in terms of y only. Show that x=[(1+sqrt(1-y^2))/y]-sqrt(1-y^2) satisfies the differential equation you found to

asked by Alex on November 3, 2012
15. ## statistics

A school adjustment inventory is administered to boys and girls of primary school.Find out weather two groups differ significantly from each other Number mean Std deviation Boys 100 32 10 girls 100 30 6

asked by Bhagya on October 5, 2012
16. ## math: repost with corrections

p. 942 #5 This is a three-part question: a. the graph y = f(x) in the xy-plane has parametrization x=x, y=f(x), and vector formula r(x) = xi + f(x)j. Use this to show that if f is twice-differentiable, then k(x) = ((absvalue f''(x))/[1+((f'(x))^2]^3/2 b.

asked by jaime on December 10, 2007
17. ## physics

Two boxes (b1 = 23 kg and b2 = 57 kg) are being pushed across a horizontal frictionless surface, as the drawing shows. The 48-N pushing force is horizontal and is applied to the 23-kg box, which in turn pushes against the 57-kg box. Find the magnitude of

asked by cody on February 10, 2012
18. ## physics

A tube that is open on both ends is 4 meters long. Assuming that the speed of sound is 340m/s, find the following: a) What is the wavelength of the fundamental standing wave (the first harmonic) b) What is the frequency of the fundamental wave? c) What is

asked by Anonymous on May 8, 2017
19. ## Science

A body initially at distance given an acceleration of 12/s2 (squared2 ). Find the velocity after it travelled 205. Q2. A body moving in linear motion start with an initial acceleration after 205 was 12m/s2. What's the velocity at this instance?

asked by Dorothy on January 26, 2016
20. ## trig

A man standing 9 meters above the ground observes the angles of elevation and depression of the top and bottom,of the top of the monument in luneta 6 degrees and 50 minutes and 7 degrees and 30 minutes respectively.Find the height of the monument?

asked by wenjelin on February 14, 2011
21. ## Calculus

A water tank has a shape of an inverted circular cone with base radius 3 m and height of 5 m. If the water is being pumped into the tank at a rate of 2 m^3 /min, find the rate at which the water level is rising when the water is 3 m deep.

asked by Jay on November 22, 2010
22. ## Physics

A body initially at distance given an acceleration of 12/s2 (squared2 ). Find the velocity after it travelled 205. Q2. A body moving in linear motion start with an initial acceleration after 205 was 12m/s2. What's the velocity at this instance?

asked by Dorothy on January 26, 2016
23. ## calculus

(Compute all instantaneous rate of change using the limit of the difference quotient) 2) A football's path is represented by the function h(t)=-4.9t^2 +10t+2, where h is its height, in meters, after t seconds. Find the rate of change of the football's

asked by matt on October 15, 2016
24. ## Chemistry

Given that 20 ml of a weak acid (HA) was titrated with NaOH and the titration curve of pH vs titrant volume in ml is given, find the initial concentration of the acid? The problem gives the full titration curve starting at pH=2.2 at 0 ml added and with the

asked by Anonymous on March 21, 2014
25. ## maths

find the gradient and y ntercept of the line with equation: y = 9 - 4x choose the one option which gives the gradient and one option which gives the y intercept from the list below. -9, -4, -9/4, -4/9, 4/9, 9/4, 4, 9 can any1 help me this is very

asked by sarah on May 19, 2007
26. ## math am i right?

the polynomial 0.041h - 0.018a - 2.69 can be used to estimate the lung capacity, in liters, of a female with height h, in centimeters, and age a. find the lung capacity of a 60 year old women who is 190 centimeters tall 9.04 liters

asked by sam on May 21, 2011
27. ## Chemistry

What is the mass of MgCl2 required to make 500mL if 1.200 M of MgCl2 Solution? I'm having trouble figuring out what the equation looks like. I believe the answer is 57.127g but if so i would like to know why. I did (1.200M*.500mL)/1000* mass of MgCl2. How

asked by Lemi on March 13, 2016
28. ## Precalculus

A woman standing on a hill sees a flagpole that she knows to be 60 ft tall. the angle of depression to the bottom of the pole is 14 degrees and the angle of elevation to the top of the pole is 18 degrees. find her horizontal distance to the flagpole.

asked by Mojo on May 21, 2011
29. ## math

a road crew must clear a hill that is 110.0 feet tall so that a new road can be built, they are to clear 11 1/2 feet of the hill each day, find the equation in slope intercept on the line that represent to height

asked by Anonymous on April 22, 2015
30. ## chemistry

calculate the energy requiered to raise the temp of 1.0 mol Ag by 1.0 degrees celsius (molar heat capacity of silver) answer in j/mol(degrees celsius) what are the steps to this problem? how do I find the second temp value?

asked by Avonlea on November 6, 2007
31. ## Math

Suppose k is a continuous function so that k(-2)=3 and k'(-2)= -4 . a. Use the given information to approximate the value of k(-1.4). b. If k''(x)

asked by Sarah on April 12, 2017
32. ## Economics

Who can raise the required reserve ratio? How does raising the required reserve ratio lead to a reduction in the money supply? do a little research then take a shot. Hint: find "money multiplier" on the web or in your text.

asked by Economics student on April 24, 2007
33. ## statistics

A random sample of 20 hogs on farmer Brown's hog farm had an average weight of 350 pounds and a SD of 70 pounds. Find 95% confidence interval estimate of the mean weight of all farmer Brown's pigs.

asked by Lacey on December 8, 2010
34. ## Physics

when a .187 kg mass is attached to a vertical spring it causes the spring to stretch distance d. if the mass is now displaced slightly from equilibrium, it is found to make 223 oscillations in 157s. Find the stretch distance d.

asked by Anon on February 28, 2011
35. ## Precalculus

A woman standing on a hill sees a flagpole that she knows to be 60 ft tall. the angle of depression to the bottom of the pole is 14 degrees and the angle of elevation to the top of the pole is 18 degrees. find her horizontal distance to the flagpole.

asked by Mojo on May 21, 2011
36. ## CHEK MATH PLZ!!!

The sample space for a roll of two number cubes is shown in the table. (1,1)|(1,2)|(1,3)|(1,4)|(1,5),(1,6) (2,1)|(2,2)|(2,3)|(2,4)|(2,5)|(2,6) (3,1)|(3,2)|(3,3)|(3,4)|(3,5)|(3,6) (4,1)|(4,2)|(4,3)|(4,4)|(4,5)|(4,6) (5,1)|(5,2)|(5,3)|(5,4)|(5,5)|(5,6)

asked by Agala on May 11, 2017
37. ## physics

A bullet is fired at an initial velocity of 300 m/s from the top of a cliff 150 m high. Find the initial horizontal and vertical components, horizontal and vertical displacement, displacement upon reaching the ground.

asked by ellah on January 9, 2012
38. ## Math

a satellite traveling in a circular orbit 2000 kilometers above the earth completes one orbit every 3 hours. assume the earth is a sphere and its radius is 6400 kilometers. find the angular velocity of the satellite

39. ## science

Find and save a piece of junk mail. What is this piece of mail trying to persuade you to do? Were you at all tempted by the offer? Why or why not? What principles of social psychology does it use to accomplish its goals? How could you use your social

asked by eid2013 on October 22, 2013
40. ## math, physics

A motorboat goes upstream on a river and covers the distance between two towns on the riverbank in 6 hours. It covers this distance downstream in 5 hours. If the speed of the stream is 1.5 km/h, find the speed of the boat in still water. [This problem is

asked by sophie on November 10, 2015
41. ## organic chemistry

Determine the percent composition of your unknown mixture. My data for refractive indexes for acetone is 1.365 and water is 1.330. This is what my unknown mixture was composed of. How do I use this info to find percent composition of each compound?

asked by Jenn on November 8, 2008
42. ## math

a ferris wheel has a radius of 8m and rotates every 12 hrs. THe bottom of the ferris wheel is 1m above the ground. draw a graph describing how a person's height above the ground varies with time. Find an qeation for your graph.

asked by linda on November 15, 2008
43. ## physics

1) write the formula to find the magnitude of gravitational force between earth and an object on earth's surface 2) how does the value of gravitational force 'f'change between two objects? 3) what is direction of an object moving with an acceleration due

asked by Charika jakhar on August 20, 2014
44. ## Geometry

A triangular entraceway has walls with corner angles of 50, 70, 60. The designer wants to place a tall bronze sculpture on a round pedestal in a central location equidistant from the three walls. How can the designer find where to place the sculpture?

asked by Anna on January 13, 2013
45. ## Math

What ratio is equivalent to 4/16? A. 2:4 B. 60 TO 20 C. 8:32 ** D. 12 TO 64 Which typing time was the fastest? A. 320 words in 8 minutes B. 600 words in 12 minutes C. 350 words in 10 minutes ** D. 225 words in 5 minutes If someone could explain how to find

asked by Trix on November 29, 2017
46. ## physics

A particle of mass m and initial velocity v collides elastically with a particle of mass M coming from opposite direction.After collision m has velocity V/2 at right angles to incident direction and M moves at an angle of 45 degree . Find M/m.

asked by Nantu on September 2, 2011
47. ## math

You deposit \$500 in an account that earns 4% simple annual interest. The interest earned each year is added to the principal to create a new principal. Find the total amount in your account after each year for 3 years.

asked by Bengie on January 31, 2019
48. ## calculus inverted cone

A container in the shape of an inverted cone has radius 6 ft and height 12 ft. It is being drained at 2〖ft〗^3/min. Find the rate of change of the height of the liquid in the cone when the height is 3 feet. The ratio of the radius to the height remains

asked by George on November 11, 2014
49. ## Data management

from a group of 6 men and 7 women going on a trip, find the number of a) ways of selecting a female tour guide, a female cook and a driver of either sex b) ways of selecting a commitee of 5 people with 4 or more men

asked by Lisa on January 18, 2008
50. ## math

simplify each expression. write your answer with positive exponents assume that all variables represent positive real numbers.find the decimal value of each expression round approximate answer to four decimal places (a^^1/2b)^1/2(ab^1/2)

asked by Anonymous on March 11, 2013
51. ## algerbra

Find the GCF of each product. (2x2+5x)(7x - 14) (6y2 -3y)( y+7) When the term "Greatest Common Factor" is used, it applies to a pair of numbers. The terms you have liated are polynomials that have already been factored. They could be further factored into

asked by Susie on July 2, 2007
52. ## Math

Could someone answer this question so I understand it. Thanks Given the supply function p = S(x)=5(e^0.02x - 1) find the average price(in dollars) over the supply interval [31,36] only the 0.02x is ^ on the e give the answer as an integer or decimal

asked by Jules on April 27, 2011
53. ## physics

a ball is thrown upward from a bridge with a speed of 48 ft/s. It misses the bridge on way down and lands in water 160 ft. below. Find how long the ball rises, how high it goes, how long it is in the air, and its velocity when it strikes the water.

asked by mia on September 26, 2016
54. ## Dance

Describe how would you execute a bend, wiggle, walk, and skip. Also when it comes to The three qualities of energy/movement collapse, explode, and swinging how would you find that in the enviroment. like what is an example of swiming, whats an example of

asked by Melissa on February 2, 2017
55. ## Math

Create a table for each set of values. Test each table for equivalent ratios to find which set of values describes the proportional relationship of the two quantities. 66 ounces of peanuts to 89.1 ounces of walnuts A) (5, 7)(60, 84)(47, 65.8) B) (36,

asked by Kaleem on September 2, 2015
56. ## Physics

A golfer, standing on a fairway, hits a shot to a green that is elevated 4.72 m above where she is standing. If the ball leaves her club with a velocity of 49.0 m/s at an angle of 42.5 ° above the ground, find the time that the ball is in the air before

asked by Jena on January 29, 2007
57. ## quick social studies question

Can you check my answer? Question: Where did Vasco de Gama go? What motivated him? When did this happen. My answer: Vasco de Gama arrived in Calicut, India on May 20,1498. What motivated him was he tried to find a sea route to East Indies.

asked by Carrie on September 15, 2009
58. ## Math

a satellite traveling in a circular orbit 2000 kilometers above the earth completes one orbit every 3 hours. assume the earth is a sphere and its radius is 6400 kilometers. find the angular velocity of the satellite

59. ## Math 133

when the volume of a cube is given by V=S3, where S, is the lenght of a side. Find the lenght of a side of a cube if the volume is 500 cm3. And round the answer to three decimal places. can you solve this problem and show all steps with the solution?

asked by Robert on July 11, 2010
60. ## Calculus

P(x)= -x^3+15x^2-48x+450, x>/3 is an approximation to the total profit (in thousands of dollars) from the sale of x hundred thousand tires. find the number of hundred thousands of tires that must be sold to maximize profit.

asked by Dan on November 4, 2010
61. ## statistics

A sample of 25 men has a mean weight of 65kg with standard deviation of 8kg. Suppose that the weight of men follows normal distribution with a standard deviation of 10kg. Find a 95% confidence interval for the population mean μ.

asked by Ali on June 3, 2011
62. ## physics

Object 1 has a mass m1 and a velocity vector v 1 = (2.87 m/s)xhat. Object 2 has a mass m2 and a velocity vector v 2 = (3.06 m/s)yhat. The total momentum of these two objects has a magnitude of 18.6 kg · m/s and points in a direction 66.5° above the

asked by aok19 on October 23, 2010
63. ## THEORY OF MACHINE

The principal stresses at a certain point in a strained material are 150 MPa and 48 Mpa both tensile. Find normal and tangential stresses on a plane inclined at 20 degree with the major principal plane.

asked by rajesh jain on January 12, 2013
64. ## MAths algebra

Suppose that there is a rectengular box with a length of 8 centimeters a width of 6 centimeters and a height of 4 centimeters.Find the length of a diagonal from a lower corner to the upper corner diagonally opposite. Answer is 10.8 centimeters

asked by Firdous on April 2, 2013
65. ## chemistry

H2(g) + Cl2(g) HCl(g) Consider the unbalanced equation above. 3.95 L of H2 and 1.00 L of Cl2 are reacted under the same conditions of temperature and pressure. (a) How many liters of HCl will be produced? (b) How many liters of reactant are in excess? i

asked by olivia on October 20, 2014
66. ## physics

A coin is placed on a vinyl stereo record that is making 33 1/3 revolutions per minute on a turntable. In what direction is the acceleration of the coin? Find the magnitude of the acceleration when the coin is placed 18 cm from the center of the record.

asked by colleen on January 31, 2012
67. ## statistics and probability

When a die is rolled and a coin(with heads and tails) is tossed,find the probability of obtaining, (a). Tails and an even number. solution. A={HH,TT,HT,HT} B={HH,TH} (b). A number greater than 3 SOLUTION. let event C=(AuB) P(C)=P(AuB)=P(A)+P(B)-P(AnB) =3/4

asked by masinde on December 3, 2015
68. ## O-Chem

Find the minimum volume of hot water needed to dissolve 100 mg of salicylic acid. Can someone help me how to start this out? I would greatly appreciate it. The data is [temp] [amount of salicylic acid per 100 ml water, g] 0 0.10 10 0.13 25 0.23 50 0.63 75

asked by Christine on August 29, 2009
69. ## math

samina spends three-fourth of her pocket money to buy chocolates and the rest to purchase chewing gum. find the ratio of amount spent on chocolates to that spent on chewing gum

asked by fizza on January 13, 2017

A company uses the function C(x)=20.50+2000, where C is the cost and x is the number of units it produces, to determine its daily costs. Find the inverse of the function and determine how many units are produced when the cost is \$625,000.

asked by Anonymous on January 25, 2013
71. ## Chemistry Help

The most effective buffer solutions have equal concentrations of salt and acid (or base). Find the pH of a buffer solution with equimolar concentrations of: (a) HCOOH and NaCOOH (Ka = 3.5 x 10-4 for HCOOH) (b)CH3NH2 and CH3NH3Cl (Kb = 3.7 x 10-4 for

asked by Luke on February 23, 2017
72. ## com/155

write a 100- word passage to Susan Anker, the author of the course's textbook, in which you describe five details from her book that are good and five details about the book that are well written. Where can I find Susan Anker's books

asked by jo on September 10, 2010
73. ## geometry

I can't figure out this problem, help would be much appreciated! Suppose line BC bisects angle ABE, and D is the interior of angle ABC. If m-angle CBD=28 degrees, and m-angle ABE=136 degrees, find m-ABD.

asked by bleach on April 26, 2012
74. ## chemistry

A galvanic cell consists of a Mn/Mn^2+ electrode (E° = -1.18v) and a Fe/Fe^2+ electrode (E° = -0.44v). Calculate the ratio [Mn2+]/[Fe2+] if E_cell = .78v at 25°C. I know to use the nernst eq. E_cell = E°_cell - RT/nF * ln(Q) where Q is the ratio I'm

asked by ciaociao on December 2, 2012
75. ## geometry

A person who is 5 feet, 6 inches (5.5 feet) tall casts a shadow (from N to S) that is 12 feet long. The distance along the ground from the person (N) to the flagpole (G) is 18 feet. Find the height of the flagpole (FG) showing all calculations. What is the

asked by David on January 14, 2014
76. ## Physics

A coin is projected with speed 6m s-1 (metres per second) along the horizontal surface of a bench. The coefficient of friction between the coin and the surface is 0.7. Modelling the coin as a particle and assuming no air resistance, find the speed of the

asked by Josep on February 19, 2013
77. ## Science

A snooker ball X of mass 0.3kg moving at 5m/s hit a stationary ball Y of mass 0.4kg and Y move at a velocity of 2m/s at angle to the initial direction of X. Find the velocity and direction of X after hitting

asked by MARTIN on September 2, 2016
78. ## maths-urgently needed

A cube or a cuboid had the volume the measurement of the cubiod area in the ratio 1:2:3 if the difference between thee cost of painting the cuboid & cube (whole surface area) at the rate of 5m is rs80 find their volume

asked by Anonymous on January 20, 2013

A photograph measures 20cm by 16cm. A strip of constant width is to be cut off the top and one side of the photo, so the area is reduced to 60% of the area of the original photo. Find the width of the cut. Thank you so much!

asked by Maya on August 17, 2016
80. ## Math

Please solve these word problem. During a triathlon, Sharon swam 1/4 of the total route and cycled 3/5 of the remaining route. She jogged the rest of the route.If she jogged 3600 m, find the total distance of the route.

asked by Tabassum sultana on January 26, 2019
81. ## physics

A toy consisting of two balls, each m = 0.56 kg, at the ends of a l = 0.73 m long, thin light-weight rod is shown below. Find the moment of inertia of the toy. The moment of inertia is to be found about the center of the rod.

asked by Anonymous on January 10, 2013
82. ## Calculus

If 40 milligrams of strontium-90 radioactively decays to 12 milligrams in 30 years, find its half-life (the number of years it takes until half of it remains). Use the formula A = p ⋅ e−kt, where p is the amount and A the (smaller) final amount.

asked by Kimberly on March 26, 2014
83. ## physics

A particle is moving clockwise in a circle of radius 1.54 m. At a certain instant, the magnitude of its acceleration is a = 26.0 m/s2,and the acceleration vector has an angle of θ = 50° with the position vector, as shown in the figure. At this instant,

asked by sara on February 15, 2012
84. ## Essay

Can someone find me an essay on service learning versus community service? These two sites discuss service learning and community service. (Broken Link Removed) http://www.nationalservice.org/

asked by John on December 10, 2006
85. ## math

The position of two towns X and Y are given to the nearest degree as X(45° N, 10° W) and Y (45 N°, 70° W). Find (a) The distance between the two towns in (i) Kilometers ( take the radius of the earth as 63711) (ii) Nautical miles ( take I nautical mile

asked by kudu on February 9, 2015
86. ## Math

A rectangular prism has a width of 92 ft and a volume of 240 ft^3. Find the volume of a similar prism with a width of 23 ft. Round to the nearest tenth, it necessary. I know the answer is 3.8 feet because I got it wrong. But why is that the answer. If you

asked by Anonymous on February 19, 2015
87. ## Reiny/ MATH Help

THANK YOU VERY MUCH!!! I forgot to say thank you for this answer the other night. There are 900 of those counting numbers with no restriction. Let's find all those that DON'T have a 2 in them there are 8 possible in the left spot , (no 2 or 0) but 9

asked by TO: Reiny on February 1, 2012
88. ## Math

The perimeter of a rectangle is 74 centimeters. The width is doubled and the length is halved. The new rectangle has a perimeter of 76 centimeters. Find the dimensions. Okay, so in class we're learning about Systems of Equations. What are the equations for

asked by Sammi on February 15, 2010

A sum of money when invested for a definite period at r% simple interest will yield an interest of rm80 .using the same interest rate, find the interest earned if the sum is tripled and the investment period is doubled

90. ## geometry

I tried to do this problem but the answer doesn't jive. Circle C has a radius of 13. Chord AB is 10. Find the distance from the center of the circle to chord AB which is labeled CD. I labeled CD = x. 1/2 of AB = 5. The line segment CB (13) is the same os

asked by robin on April 24, 2015
91. ## Chemistry

A 38.5 mL sample of HBr is titrated with 112 mL of 1.05 mol/L KOH. The density of the HBr solution is 1.75 g/mL. Calculate the percentage by mass of the HBr in the sample. How come we don't use density*volume to find the moles of HBr?

asked by Sam on December 2, 2015
92. ## Chemistry

0.000333 g fluorescein (332.32 g/mol) is dissolved in 225 mL solution of ethanol. The density of ethanol is 0.785 g/mL. What is the concentration of the solution in molarity (M)? How many ppm? I already know that the molarity is 4.45E-6. I just need help

asked by Vince on July 16, 2012
93. ## Calculus 2 - Series

I am so confused on how to do series problems...especially these. How can you tell the pattern and determining the formula for them? Can someone please help? 26) Write the first five terms of the sequence {an} whose nth term is given. an = (n + 3)/(2n −

asked by Helen on March 29, 2015
94. ## physics

A circular plate of uniform thickness has a diameter of 56cm.A circular portion of diameter 42cm is removed from one edge of the plate .find the position of the center of mass of the remaining portion.

asked by sony on October 13, 2012
95. ## Math

The dissipation of heat through a composite material of width w centimetres can be modelled by the function f(w)=10/w-0.77ln(w)–3.2 You are required to find the width of material that will prevent any heat dissipation. State what equation you will need

asked by Sam on February 14, 2015
96. ## Calculus

A medicine is administered to a patient. The amount of medicine M, in milligrams, in 1 mL of the patient’s blood, t hours after the injection, is M(t)=-1/3t^2+t where 0

asked by Morris on February 17, 2016
97. ## math

Shane invests \$7,000 in bonds that earn simple interest of 3%. The interest is payable at the maturity of the bonds after 5 years. Find the total amount that Shane will receive at the end of 5 years.

asked by kim on January 25, 2012
98. ## Human services

find at least three examples of mission statements for human services organizations. show how each one of the mission statements does or does not meet the requirements of a good mission statement. Then determine what other purpose or function the mission

asked by Martha on February 14, 2008
99. ## Physics

Two forces act concurrently on a point P. One force is 60nt due east. The second force is 80nt due north. (a) Find the magnitude and direction of their resultant. (b) What is the magnitude and direction of the equilibriant?

asked by Elise on January 17, 2011
100. ## math

The perimeter of a rectangle is 68 f. Find the dimensions of the rectangle if the ratioof the length to the width is 9:8 I am sorry that nobody has responded earlier. The perimeter is the sum of the length of the four sides. Therefore: 2(9X) + 2(8X) = 68

asked by mukesh on February 10, 2007