Wednesday

August 24, 2016
Number of results: 118,476

**Chemistry**

The pH of a 0.065 M solution of a weak base is 11.70. What is the value of Kb for this base?
*February 27, 2011 by Brian*

**Chemistry**

A certain weak base has a Kb of 8.10 10-7. What concentration of this base will produce a pH of 10.00?
*October 25, 2011 by Dana*

**chemistry**

A certain weak base has a Kb of 9.00 10-7. What concentration of this base will produce a pH of 10.34?
*October 21, 2012 by Kelly*

**Chemistry**

A 0.010M solution of base B is 15% dissociated. Calculate the Kb for base B.
*February 24, 2013 by James*

**chemistry**

A certain weak base has a Kb of 8.40 10-7. What concentration of this base will produce a pH of 10.34?
*March 26, 2013 by Anonymous*

**chemistry**

A certain weak base has a Kb of 8.40 10-7. What concentration of this base will produce a pH of 10.34?
*March 28, 2013 by Anonymous*

**chemistry**

A certain weak base has a Kb of 7.80 10-7. What concentration of this base will produce a pH of 10.17?
*May 19, 2013 by Lana*

**Chemistry**

If the pH of a 0.46 M aqueous solution of a weak base is 9.2, estimate the Kb of the base:
*August 1, 2016 by Damon*

**algebra 1**

the base of isosceles triagle is 5 m less than 4 times the length of a side. The perimeter is 67, find the length of each side and the base
*September 30, 2013 by Mayi*

**Algebra**

the base of isosceles triagle is 5 m less than 4 times the length of a side. The perimeter is 67, find the length of each side and the base
*September 30, 2013 by Mayi - In need of help - Please :) *

**Physics**

3 charges sit on vertical equilateral triangle the side of each is 30.0 cm. if the triangle are A= +4.0 uC B=+5.0 uC and C=+6.0 uC (clockwise from top) what is the force on each charge? Can someone please explain me in detail i am really confuse :(((
*August 19, 2012 by sara*

**math problem triangle inequality help**

Two sides of a triangle are 11 and 17. How many possible lengths are there for the third side, if it is a positive integer? I tried listing them all but I get confused...Please help thank you!
*December 26, 2012 by Knights*

**Calculus**

Q. An open-top box with a square base is to have a volume of 62.5 square inches. What dimensions will yield the box of minimum surface area? I am getting 5" by 2.5" but not sure.
*March 3, 2012 by Casey*

**Calc**

We assume that an oil spill is being cleaned up by deploying bacteria that consume the oil at cubic feet per hour. The oil spill itself is modeled in the form of a very thin cylinder as depicted below. Its height is the thickness of the oil slick. We assume that an oil spill ...
*February 25, 2008 by Anonymous*

**maths (trigonometry)**

The angle of elevation and angle of depression of the top and base of a mobile tower from a mobile handset are 60 degree and 30 degree respectively. If the distances of the top and the base of the tower from the mobile handset are 15m and 8m respectively, find the height of ...
*December 11, 2015 by keya*

**geometry**

How many square inches are in the lateral surface area and total surface area of an aluminum can with 2 1/2 in. diameter and 4 3/4 in. height? I've worked on this until I'm crossed-eyed and it's not coming out right!
*March 9, 2013 by tmouery*

**Physics**

From the edge of the rooftop of a building, a boy throws a stone at an angle 24.0 above the horizontal. The stone hits the ground 4.40 s later, 104 m away from the base of the building. (Ignore air resistance.) Find the initial velocity of the stone. What's the magnitude and ...
*February 8, 2010 by Max*

**Math**

The sum of the lengths of the sides of triangle ABC is 38in. The length of sides AB and BC are 14 inches and 11 inches. Find the length of side AC and classify the triangle.
*March 5, 2012 by Elaina*

**Algebra**

The hypotenuse of a right triangle is 13 inches long. The shorter leg is 7 inches shorter than the longer leg. Find the side lengths of the triangle.
*March 23, 2016 by Jewls*

**math**

triangle abc is reflected over the y-axis. What are the coordinates of the reflected triangle? Describe in words what happens to the x-coordinates and y-coordinates of the original triangle's vertices as a result of this reflection? I can't figure out how to describe what ...
*March 15, 2016 by Amanda*

**Math**

The shorter edges of a 36 cm x 20 cm metalsheet are joined to form the vertical surfaces of a square base prism. What is the volume of the prism? what is the area of metal sheet required to make the top and the bottom of the prism.
*July 17, 2016 by John*

**maths**

Choose three options which are true: a) an angle of 150 degrees is equivalent to 2pie/3 radians. b) Cos 0 = cos (0 pie/2) for al values of 0. c) Sin 0 = cos (0 pie/2) for all values of 0. d) If triangle ABC has a right angle at B, then sin A = cos C e) In any triangle ABC...
*June 8, 2007 by kat*

**math**

can anyone help please, i need a simple formula for working out taxes.if i had any number i need to know what the base was before 16% tax was added. i know the formula if the tax was 17.5%,what ever the total is if you divide that by 47 then x that by 7 that will give you the ...
*April 15, 2007 by simon*

**Math **

I am doing a project, are my answers correct? 1. Find and simplify the volume-to-surface-area ratio for each of the three possible ice cube shapes. You can use this chart. |Shape| S/A Formula|Volume Formula Cube | S.A=6s^2 | V=s^3 6/s Sphere|S.A+4 pi r^2|V=4/3 pi r^3 3/r ...
*March 4, 2016 by Alexia Smith*

**Math please help! Urgent **

Find the height of an equilateral triangle with sides of length 6 cm ' please show ur work
*November 25, 2012 by Jessica *

**Math: Functions**

A circular oil slick is expanding with radius, r in yards, at time t in hours given by r=2t-0.1t^2, for t in hours, 0<t<10. find a formula for the area in square yards, A= F(t), as a function of time.
*October 7, 2011 by Savana*

**log graph**

How do you graph y= -log (base 5)(-x)? The written question is: Sketch above equation by first describing the transformations performed on the equation y= log (base 5)(x) And what is the inverse function? x=log (base 5)(y)?
*November 1, 2010 by Ali*

**Math**

The circular area A in square centimetres of a healing wound is given by A(r)=πr^2 Where r =the radius in centimetres. Find the rate of change of the area with respect to the radius. My work: I'm not really sure if this is correct but I gave it a try. Dy/dx =π*2r^2-1...
*February 24, 2016 by Nicki*

**Math**

Sam wants to find the height of a window in a nearby building but it is a cloudy day. Sam puts a mirror on the ground between himself and the building. He tilts it so that when he is standing up he sees the reflection of the window. The base of the mirror is 1.22 meters from ...
*March 10, 2016 by Ashley*

**trig**

find the value of x when: x= 5 log base 2 (1/16)+ 8 log base 3 (27)
*August 26, 2011 by pat*

**Calculus**

Suppose that the region between the x-axis and the curve y=e^-x for x>=0 has been revolved around the x-axis. Find the surface area of the solid. I got 3*pi The book shows an answer of pi * [sqrt(2) + ln(1 + sqrt(2))] Where do I go wrong? For the sides of the surface, I ...
*January 13, 2008 by mathstudent*

**math**

A baseball player reaches base 35% of the time. How many times can he expect to reach base in 850 at-bats?
*April 30, 2012 by Jessica*

**Math**

In chemistry class, each of the 82 students needs 72 mL of base. How many one- liter bottles of base need to be available? Help?
*November 28, 2015 by kristine*

**geometry**

word problem You and 3 friends order a 24 in pizza (the diameter is 24 inches) what is the area of the pizza? Round to the nearest tenth. If you and 3 friends spit the pizza evenly, how much do you get to eat? What is total area? and what is your area? for total area i got 452...
*May 6, 2012 by marko*

**Algebra**

Identify the triangle PQR as isosceles ( two sides equal length) equilateral (three sides of equal length) a right triangle, or a scalene triangle (three sides of different length)
*September 18, 2011 by Amanda*

**Math**

The length of the hypotenuse of a right triangle is 2m more than the longer leg. The longer leg is 7m longer than the shorter leg. Find the perimeter of the triangle. ( please explain as you go)
*March 31, 2016 by Julia*

**Calc**

Consider the Dosage Formula y=(S/1.73 where y = childfs dosage, a = the adult dosage, and S = the surface area of the body in square meters. The Surface Area Formula is S(w,h)=0.0101w^(.425)*h^(.725) where S = the surface area of the body in square meters, w = the weight in ...
*February 16, 2012 by Fatih*

**CALCULUS **

a. for y= sinx y=0 and x=pie/2 if each cross section is an equilateral triangle perpindicular to the x axis what is the total area? b.also same question except triangles are perpindicular to y axis answer's are appreciated but i need the work more.
*February 3, 2011 by Little*

**science**

three point electric charges q,2q,4q are placed at the three vertices of an equilateral triangle inscribed in a circle. find the net elect ric field at the centre of the triangle. answer : I think the answer is( 910^9 q√10)/r^2 ,where r is the radius of circle
*May 4, 2016 by shivansh*

**calculus**

Find the area bounded by {y=x2−4 y=4−x2 sketch the region described determine any intersection point(s) for the curves (show work!!) write out the integral(s) that will calculate the area determine the area (may use a calculator)
*October 3, 2013 by Will*

**physics**

From the edge of the rooftop of a building, a boy throws a stone at an angle 30.0 above the horizontal. The stone hits the ground 4.10 s later, 112 m away from the base of the building. (Ignore air resistance.) (a) Find the initial velocity of the stone. magnitude _____ ...
*February 14, 2010 by jenn*

**MATH HELP PLEASE!!**

1. Mandy kept track of the trade-in value of a collectors coin for several months through February of this year. She determined the line of best fit for the data was y = 4x + 12, where y is the trade-in value, in dollars, x months after February of this year. According to the...
*May 23, 2014 by kelsey *

**calculus(Lab)**

Well, first graph the graph of f(x)=-1/10x^2 + 3 2. We are going to approximate the area between f and the x-axis from x = 0 to x = 4 using rectangles (the method of Riemann sums). This is not the entire area in the first quadrant, just most of it. Draw four inscribed ...
*January 25, 2012 by Yoona*

**math**

A right circular cone stands on a hemisphere. The base radius of the cone is equal to the radius of the hemisphere. If the base radius of the cone is 10 centimeters and its height is 15 centimeters,calculate the total volume of the solid.
*January 6, 2016 by Dennis*

**Chemistry**

Use the Bronsted-Lowry definitions to identify the two conjugate acid-base pairs in the following acid-base reaction: H20 + H20 <-> H30^+ + OH^- Let's see what you think on this after the previous post. Just remember, the acid is the one that HAS the H and the base is ...
*May 26, 2007 by Raj*

**PLEASE HELP TANGENTS AND CIRCLES PROBLEM GEOMETRY**

PLEASE HELP I REALLY NEED HELP. Each of the three circles in the figure below is externally tangent to the other two, and each side of the triangle is tangent to two of the circles. If each circle has radius three, then find the perimeter of the triangle. The figure is ...
*February 2, 2013 by Knights*

**physics**

A 66.0 kg base runner begins his slide into second base when he is moving at a speed of 4 m/s. The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just as he reaches the base. (a) How much mechanical energy is lost due to ...
*October 4, 2008 by Sandhya*

**Physics**

A 67.0 kg base runner begins his slide into second base when moving at a speed of 3.5 m/s. The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just as he reaches the base. How much mechanical energy is lost due to friction ...
*November 14, 2010 by Marcus*

**Physics**

A 69-kg base runner begins his slide into second base when he is moving at a speed of 3.7 m/s. The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just as he reaches the base. (a) How much mechanical energy is lost due to ...
*May 3, 2013 by Abdul A.*

**Physics**

A 69-kg base runner begins his slide into second base when he is moving at a speed of 3.7 m/s. The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just as he reaches the base. (a) How much mechanical energy is lost due to ...
*May 7, 2013 by Abdalla A.*

**Physics **

A 66.0 kg base runner begins his slide into second base when moving at a speed of 4.4 m/s. The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just as he reaches the base. (a) How much mechanical energy is lost due to friction...
*October 25, 2014 by Caitlin *

**pre-calc**

a farmer wants to make a rectangular enclosure using a wall as one side and 120 m of fencing for the other three sides. a) express the area in terms of x and state the domain of the area function b)find the value of x that gives the greatest area. my teacher didn't explain how...
*October 1, 2007 by INEEDHELP!!!*

**math**

The base of a rectangular prism is 6 inches - 9 inches. what is the lateral area of the prism
*July 16, 2014 by hannah*

**Maths-Vectors Assistance PLZZ!**

Prove that the vectors u=3i+j-2k , v= -i+3j=4k, and w=4i-2j-6k can form the sides of a triangle They will form a triangle if they are linearly dependent, that is, if (3,1,-2)= m(-1,3,4) + n(4,-2,-6) from which we get 3 equations in two unknowns. -m + 4n = 3 #1 3m - 2n = 1 #2 ...
*April 16, 2007 by Babanla*

**geometry**

Given: AC perpendicular BD and AB congruent CB. Prove AD congruent CD. It is a kite figure. I need statements and reasons. Problem states Plan: prove triangle ABE congruent CBE. The use congruent corresponding parts AE and CE to show right triangle AED congruent CED. AD and CD...
*April 10, 2015 by eric*

**Math**

Water is flowing into a trough at a rate of 100 cubic centimeters per second. The trough has a length of 3 meters and cross sections in the form of a trapezoid, whose height is 50 cm, whose lower base is 25 cm and whose upper base is 1 meter. At what rate is the water rising ...
*May 12, 2014 by Hao*

**GEOMETRY**

Which statement is contrapositive of the conditional: If a triangle is isosceles, then it has 2 congruent sides. 1. If a triangle does not have 2 congruent sides, then it is not isosceles. 2. If a triangle is isosceles, then it does not have 2 congruent sides. 3. If a triangle...
*February 20, 2012 by Tyler*

**math**

triangle abc angle A+B=166 degree and angle b+c=126 degree find the measure of each angle of the triangle
*August 6, 2016 by kukut*

**differential calculus**

a right circular cylinder has a fixed height of 6 units. Find the ratio of change of its volume(v) with respect to the radius(r) of its base.
*July 27, 2011 by wen*

**differential calculus**

a right circular cylinder has a fixed height of 6 units. Find the ratio of change of its volume(v) with respect to the radius(r) of its base.
*July 27, 2011 by wen*

**math (check please)**

find the volume of a square pyramid with a base length of 9cm and a height of 4cm. ANSWER: 108 cm^3 (is it right?)
*March 20, 2014 by luna*

**math**

What do they mean when they say given angle and given side of a triangle???? I dont get this
*May 30, 2011 by Traveling Girl*

**4th grade**

what is the formula to find the area of a garden lot.
*March 23, 2010 by towonna*

**algebra equation**

How do I find a formula for the area of a circle with a circumference c?
*September 16, 2010 by mike*

**math**

what is the formula used to find the area of a composite figure
*March 30, 2011 by paskelly*

**maths --plse help me..**

can we prove the formula to find the area of an octagon
*December 22, 2012 by Anonymous*

**algebra 1**

how do you find the area or geometric sequence of the explicit formula
*April 10, 2015 by Dakota Rodriguez*

**Math**

A man owns a rectangular piece of land. The land is divided into four rectangular pieces, known as Region A, Region B, Region C, and Region D. One day his daughter, Nancy, asked him, what is the area of our land? The father replied: I will only tell you that the area of Region...
*May 7, 2014 by Josh*

**Geometry**

the area in a circle of each shaded region is given. Find x The given is 66 the angle is 180
*March 31, 2011 by shannon*

**Help!!!!!!!!!**

Calculate Triangle G, free energy change, that occurs when 12g of Shila react with excess And at 298k according to the following reaction: N2(g)+3H2(g)<======>2NH3(g) Triangle G=-34KJ/mole
*December 19, 2012 by Lost Girl!!*

**math,trigonometry**

solve each triangle described below using Δ ABC : 1)a = 10, A = 16, B = 49 2)a = 8, b = 7, A = 88 I dont know how to do this i forgot ... could u help (Steve, or Mrs.Sue, or Writeteacher plz help) this topic is Oblique triangle
*January 5, 2015 by Anonymous*

**interesting log problem**

log base 2n 1944 = log base n (486* (2)^1/2) find n^6
*December 12, 2010 by maya*

**Geometry **

A right cylinder has a radius of 2 feet and a height of 5 feet. Find the surface area of the cylinder. What formula should I be using ? My answer should be 28pi ft^2 I didn't get this using 2pi.h + 2pir^2
*May 25, 2011 by Mary *

**math**

A wire is stretched from the ground to the top of an antenna tower. The wire is 20 feet long. The height of the tower is 4 feet greater than the distance from the tower's base to the end of the wire. Find the height of the tower. 20 ft.= w x.4 = height of tower something like ...
*September 25, 2008 by jennifer*

**geomitry**

the first angle of a triangle is complementry to the third angle. the second angle is 16 degrees less than five times the first angle. find the measure of the largest angle of the triangle.
*January 20, 2011 by gabriel*

**geometry**

in a triangle the middle length side is 3 more than the shortest side, and the longest side is double the middle lenght side the perimeter of the triangle is 45cm find the lenghts of the side
*February 15, 2011 by Anonymous*

**Math**

1. Find the value of Sin^-1(-1/2) a. -30 degrees b. 30 degrees c. 150 degrees d. 330 degrees 2. Find the exact value of cos(-420 degrees) a. -1/2 b. 1/2 c. sqrt of 3/2 d. -sqrt of 3/2 3. p(-9/41, 40/41) is located on the unit circle. Find sin theta. a. 40/41 b. -9/41 c. -9/40 ...
*April 5, 2008 by Belden*

**science**

Calculate the Molar Enthalpy of Neutralization (Hn) in kJ/mol of the reaction between a monoprotic acid and a monoprotic base, given the following information: The temperature change equals 5.30C, 50.0 mL of 1.00 M concentration of Acid 50.0 mL of 1.00 M concentration of ...
*November 17, 2013 by brittany sheats*

**Math**

Two triangles are similar. The measure of the shortest side of the first triangle is 12 and the measure of the shortest side of the second triangle is 5. If the longest side of the first triangle measures 15, what is the measure of the longest side of the second triangle? A.2....
*January 3, 2010 by S *

**math**

Can someone please help me with the following problems Determine if the triple numbers are can be sides of a right triangle? sqrt(10)sqrt(13)sqrt(23) The length of thy hypotenuse of a right triangle equals the length of one of legs of the triangle A) always true B) sometimes ...
*May 22, 2010 by Nicole*

**Algebra 2 ..**

Simplify. 1. (1/log base 3 of 60)+ (1/log base 4 of 60)+ (1/log base 5 of 60) 2. (log base 16 of x)+ ( log base 4 of x) + (log base 2 of x)=7
*April 21, 2013 by Anonymous*

**geometry**

The sum of the lengths of the sides of triangle ABC is 25 in. The lengths of sides AB and BC are 9 inches and 8 inches. Find the length of side AC and classify the triangle.
*March 15, 2011 by Portia*

**Geometry **

A triangle is enlarged by a factor of 3. The perimeter of the new triangle is 36 feet. What could be the lengths of the sides of the original triangle? A. 3 feet, 4 feet, and 5 feet B. 1.5 feet, 1.25 foot, and 1.25 foot C. 2 feet, 0.5 feet, and 1.8 feet D. 4 feet, 4 feet, and ...
*March 2, 2014 by anon*

**Math**

Please Help A body consists of a solid hemisphere of radius r joined to a right circular cone of base radius r and perpendicular height h. The plane surfaces of the cone and hemisphere coincide and both solids are made of the same material. Show that the centre of gravity of ...
*July 24, 2016 by Joe*

**physics,plz.....give me answer as soon as possible**

a pond of water filled with water apto 60m. 1)write formulato find the pressure of water exerted on the base of pond. 2)calculate the pressure exerted by the water on the base of pond?density of water is 1000kg/m3 3)half of the water was removed from the pond.what could be the...
*November 24, 2010 by sweetie*

**ap calculus**

The height s of a ball, in feet, thrown with an initial velocity of 112 feet per second from an initial height of 6 feet is given as a function of time t (in seconds) by s(t)=-16t^2+112t+20. 1. What is the maximum height of the ball? 2. At what time does the maximum height ...
*September 18, 2009 by muffy*

**Math**

A base ball diamond is square. The distance from home plate to first base is 90 feet. In feet, what is the distance from home plate to second base? (1 point) 127 81 19 13
*October 2, 2012 by Sunbird*

**College Algebra**

You have 100yds. of fencing to enclose a rectangular area. Find the dimensions which maximize the area. What is the maximum area? I know that A=L times W. I know that 100 = 2L+2w Subtract 2L from both sides: 100-2L=2W Divide by two: 50-L=W Substitute in original equation: A=LW...
*March 15, 2011 by Brooklyn*

**science**

the ph of a 0.280m solution of a weak base. B has been measured ph --8.69. using this information. calculate the base ionisationconstant kbof b
*September 14, 2012 by Emily*

**Chemistry**

Aniline, C6H5NH2, is a weak base. If the hydroxide ion concentration of a 0.223 M solution is 9.7 10-6 M, what is the ionization constant for the base?
*May 1, 2014 by John*

**Chemistry**

Aniline, C6H5NH2, is a weak base. If the hydroxide ion concentration of a 0.201 M solution is 9.2 10-6 M, what is the ionization constant for the base?
*May 5, 2014 by Harry*

**physics**

What is the velocity of a baseball thrown 40m from third base to first base in 1.9s? Show your work, and simplify please.
*October 28, 2014 by Sabrina*

**Algebra II**

The shape of a supporting arch can be modeled by h(x)= -0.03^2+3x, where h(x) represents the height of the arch and x represents the horizontal distance from one end of the base of the arch in meters. Find the maximum height of the arch.
*March 1, 2008 by Jon*

**Math**

Brilli the ant has a block of cheese that is in the shape of an equilateral triangle. She is hosting a party, and has invited her two-legged house mates. She insists that all of her guests get a piece of cheese that is in the shape of an isosceles triangle. What is the maximal...
*July 15, 2013 by Mark*

**Math**

Brilli the ant has a block of cheese that is in the shape of an equilateral triangle. She is hosting a party, and has invited her two-legged house mates. She insists that all of her guests get a piece of cheese that is in the shape of an isosceles triangle. What is the maximal...
*July 16, 2013 by Mark*

**Physics HELP!**

A 85.0 kg base runner begins his slide into second base when he is moving at a speed of 2.10 m/s. The coefficient of friction between his clothes and Earth is 0.570. He slides so that his speed is zero just as he reaches the base. (a) How much mechanical energy is lost due to ...
*October 5, 2012 by Samm*

**Physics HELP!**

A 85.0 kg base runner begins his slide into second base when he is moving at a speed of 2.10 m/s. The coefficient of friction between his clothes and Earth is 0.570. He slides so that his speed is zero just as he reaches the base. (a) How much mechanical energy is lost due to ...
*October 7, 2012 by Anonymous*

**Physics**

A 85.0 kg base runner begins his slide into second base when he is moving at a speed of 2.10 m/s. The coefficient of friction between his clothes and Earth is 0.570. He slides so that his speed is zero just as he reaches the base. (a) How much mechanical energy is lost due to ...
*October 7, 2012 by Anonymous*

**College Math**

12 base 5 divide by 4021 base 5
*December 11, 2007 by Pumpkin*

**chemistry**

The pH of a 1.2 M solution of an unknown weak base is 10.65. What is the Kb for the base?
*February 19, 2010 by rodrigue*