
math
An archaeologist in Turkey discovers a spear that contains 80% of its original amount of C14. Find the age of the spear head to the nearest year.
asked by Anonymous on August 31, 2018 
Chemistry
If the wavelength of an electron is equal to the radius of the n=2 orbit in He+, what must the velocity of the electron be? The answer is 6.88 x 10^6 m/s How do I find this? I tried E = Z^2hcRh/n^2 and E= 1/2mv^2 with Z = 1, n=2, m=9.109E31
asked by Shaniquaa on December 7, 2008 
Precalc
1. Find the equation for a quadratic function whose vertex is (2,5) and whose graph contains the point (8,15). 2.What are the x and y intercepts for y=2x^2+x6 Plesee explai. I want to learn to learn how to do them.
asked by Leslie on July 12, 2010 
math
a sum of money at certain rate of interest of amount to 8320 in 2years and 9685 in 3 and half years.find the sum ?
asked by mahe on October 16, 2018 
cal3
Find and classify all local minima, local maxima, and saddle points of the function f(x,y)= 3yx^23xy^2+36xy
asked by Lucy on February 27, 2012 
probability
If a number is chosen at random from the integers 5 to 25 inclusive, find the probability that the number is a) multiple of 5 or 3 b) even or prime numbers c) less or greater than 18
asked by Anonymous on May 31, 2016 
Calc
Hi! Please help :) Find an equation for the circle of the curvature of the curve r(t) = ti + (sint)j at the point (pi/2, 1) (The curve parametrizes the graph of y = sinx in the xyplane)
asked by Sadie on December 9, 2007 
Maths
In the triangle ABC, AD is perpendicular to BC. Angle CAD=y and angle DBA=x. AC=17 and BD=25 units Find the value of 5cosx 17siny+tanx
asked by Rachana on September 12, 2016 
statistics
Suppose that a coin is tossed 100 times. Let X be the number of times that it shows heads. Find the mean and standard deviation of X.
asked by Mschribe on December 13, 2010 
english
Which is the best place to find more info about the development of photography in the mid 1800/s. photography manual  history textbook .encyclopedia
asked by Anonymous on May 10, 2014 
science
a particle moves 1/3rd of the distance in aspeed of 6km/hr and rest with a speed of 18km/hr.find the average speed?
asked by sidharth on September 9, 2015 
math
From a rectangular sheet of acrylic of dimensions 32 cm by 24 cm 64 circular buttons, each of diameter 3.5 cm , have been cut out. Find the area of the remaining sheet.
asked by avinash on August 22, 2016 
Physics
2 forces acting at a point make angles of 25 and 65 degrees respectively with their resultant which has a magnitude of 150 N .Find the magnitude of the two components.
asked by Joseph on December 31, 2010 
geometry
the lengths of the diagonal of a rhombus are 2 in and 5 in. find the measure of the angles of the rhombus to the nearest degree. if it helps, we are learning how to use tangent right now!
asked by Lily on February 14, 2011 
Precalc
Find a rectangular equation for the plane curve defined by the parametric equations. x = sin(theta) y = 3cos(theta)
asked by Heather on June 10, 2015 
english
where can i find some reason to support this opinion "high schools should not only prepare students for college, they also need to help them prepare future possibilities."
asked by 000 on December 13, 2010 
differential calculus
A bulldozer costs $120,000 and each year it depreciates 8% of its original value. Find a formula(equation) for the value V of the bulldozer after t years.
asked by christine on September 13, 2016 
Math
A cylindrical soup can has a radius of 4.1 inches and a height of 2 inches. Find the volume of this can. a.In terms of pi b. Also.To the nearest cubic inch
asked by MP on January 18, 2013 
math
Find equations for the asymptotes of the hyperbola x2/9  y2/81 = 1 Rewrite the equation as (x/3)^2  (y/9)^2 = 1 When both x and y are very large in absolute value, the "1" on the right is negligible in comparison, so y/9 approaches +/ x/3 The asymptotes
asked by zinnia on August 5, 2007 
Eastern Religion
I am looking for reliable link on Dogen Kigen  a Zen monk. Can someone provide a link or suggestion to find information about this philosopher? Thanks!
asked by Onlin Bus on February 10, 2010 
Math 172
Find the breakeven point for the firm whose cost function C and revenue function R are given. C(x) = 14x + 9,000; R(x) = 23x (x, y) = (_________)
asked by Leyla on September 12, 2016 
geometry
A hemispherical dome holds a volume of 486π..find the surface area (omit the area of the circle)? I just need the formulas id use
asked by Jane on May 30, 2014 
physics
find the magnitude and direction needed to accelerate a 100g mass with an acceleration = .255 m/s squared+.650 m/s squared
asked by Trini on October 9, 2013 
Quadratics
The parabola with the general equation y= ax^2 + bx+ 9 where0 < a < 10 and 0 < b < 20 touches the xaxis at one point only. The graph passes through the point (1, 25). Find the values of a and b. Please help.
asked by Kevin on June 29, 2018 
Math
Two right angled triangles are joined with a common height and the height is 12m and base of each triangle = 5m.Find out the perimeter of whole figure
asked by Shikha on September 5, 2015 
algebra/I appreciate your help
Find the future value, using the future value formula. Round the answer to the nearest cent. $625 @ 5.5% compounded quarterly for 3 years.
asked by Mary Ann on May 18, 2014 
Math
Find the sales necessary to break even (R = C) when the cost C of producing x units is C = 2.24x + 6100 and the revenue R from selling x units is R = 3.49x.
asked by Anonymous on August 22, 2018 
Algebra
f(x) = 4x2; x = 2, x = 2 + h this is telling me to find the average rate of change and the net change? I found one but my answer is disapproved from a friend.
asked by miriam on July 20, 2015 
math
Show how to find the quotient 18 divided by (6) by using the following: a) the idea of division as finding a missing factor. b) the procedures for integer division.
asked by m on October 19, 2010 
Physics
A light ray in air is incident on a water surface at a 44° angle of incidence. Find each of the following angles. (b) the angle of refraction °
asked by DCM on March 5, 2012 
ALB 2
1.Find the greatest common factor in this problem. 12a3b2, 18a2b3, 6a4b4 2.Factor each of the following polynomials. 4s _ 6st _ 14st2
asked by JANE on February 13, 2008 
maths
A tree casts a shadow 4 metre long on the ground, when the angle of elevation of the sun is 45°.find the height of the tree
asked by Anjali on March 4, 2017 
Calculus
Can someone show how this question is solved. Consider the curve given by the equation 2y^3 + y^2  y^5 = x^4 2x^3 +x^2 Find all points at which the tangent line to the curve is horizontal or vertical. Thanks!
asked by Henry on July 18, 2015 
Math
TheTemperature of midnight is 14°c,The roomtemperature increases at the rate of3°C per room .Find the temperature of the room At 7am and 12 noon
asked by Satyam on May 22, 2019 
elementary math for teachers
The letters LACSIPE fell off a billboard. How many different ways can the letters be arranged, hoping to find the correct spelling of SPECIAL?
asked by jen on October 15, 2009 
Calculus
Find the equation for a line which passes through the points (–1, 1) and (3, –7). Write the equation in slopeintercept form. Show work.
asked by Brian on March 10, 2012 
Math
Of 20 scores, 19 are less than or equal to 10. Find the percentile rank of 10. They don't give you the exact number of tens so i don't really know how to do this? Could someone please explain?
asked by Angela on September 23, 2015 
Math
How do you find decreasing intervals of 6x^363x^2144x2? I found my increasing intervals from placing the derivatives i just can't seem to solve for the decrease
asked by Alessandra on November 4, 2014 
science
a ball is dropped from the roof of a building. it takes 10 seconds to reach the ground. find the height of the building.(g=9.8/s square)
asked by swagster on August 8, 2013 
Math
Can someone help me find the technique or techniques used in this problem? 146 divided by 68. I thought that 14 and 7 are easy to divide, so I used 140 divided by 70, which is 2. The quotient is about 2.
asked by B.B. on June 12, 2009 
Math
For each point in a set of points, its distance from (2,4) is three times its distance from the line x=6 1. find the equation 2. tell which conic section the graph will be.
asked by Steven on March 1, 2012 
physics
If a proton is accelerated from rest through a potential difference of 1500 V, find its final velocity. proton mass = 1.67 x10−27 kg
asked by angela on October 15, 2010 
math 11
Is it possible for a rectangle with a perimeter of 44cm to have the area of 125cm^2 ? If so, find the dimensions of the rectangle. Figure out the equation in general form.
asked by riley on October 21, 2010 
calculus
Can someone please help explain these two questions for me. For the first one my guess is that it is infinity and for the second question it would be at 0. Find the limit. lim_(x>infinity) (x^(3)  2x + 3)/(4  5 x^(2)) Locate the discontinuities of the
asked by Tersa on October 15, 2010 
management
I need help on where to find information on the effectiveness of walmarts control mechanisms. The mechanisms are: price, communication, power and trust.
asked by patiance on October 21, 2010 
Math
Using nonperfect square method,find the square root of 418 correct to two decimal places, showing workings.
asked by Ebun on February 13, 2011 
Physics
Two charges are placed on the x axis. One of the charges (q1 = +8.71C) is at x1 = +3.00 cm and the other (q2 = 28.6C) is at x2 = +9.00 cm. Find the net electric field (magnitude and direction given as a plus or minus sign) at (a) x = 0 cm and (b) x =
asked by Alex on September 28, 2012 
physics
The 20kg object is dropped from a height of 2 meters. Find its speed when it hits the ground. Give your answer in meters per second.
asked by Darcie on February 26, 2012 
statistics
Assume that a set of test scores is normally distributed with a mean of 80 and a standard deviation of 25. Use the 689599.7 rule to find the following quantities. The percentage of scores less than 80 is?
asked by nicole on May 24, 2011 
algebra 1
f(x) = 2x^2+4x+1 Can someone explain how the f(x) is worked into this function? I am supposed to graph the function and find the vertex and the axis of symmetry.I'm a little lost no major.
asked by Paige on March 11, 2017 
college physics
Two charges are placed on the x axis. One of the charges (q1 = +8.71C) is at x1 = +3.00 cm and the other (q2 = 28.6C) is at x2 = +9.00 cm. Find the net electric field (magnitude and direction given as a plus or minus sign) at (a) x = 0 cm and (b) x =
asked by Alex on September 28, 2012 
Math
Find the amount of the regular payments needed to amortize a $90000 debt at 7% compounded annually with 12 annual payments.
asked by Kristen Morris on December 13, 2011 
CHEMMMMM
Find the Electron DOMAIN GEOMETRY & the MOLECULAR GEOMETRY of the following compounds: 1) ICl3 2) PCl3 3) XeF4 4) SF6 5) TeCl4
asked by BMW on March 30, 2012 
math
1.find the future value for the following investment : a) RM19999 at 4.5% COMPOUNDED every 2 months for 2 year b) RM 120000 at 5 3/4 percent compounded monthly for 3 1/4 years
asked by fizz on April 24, 2014 
English
What is an example of morbidity in "The Fall Of the House of Usher" by Edgar Allan Poe ? I know what morbidity is but it's hard finding an example in the story so can you please help me find an example of it.
asked by Jessica on November 24, 2014 
geometry
Two circles of equal radius intersect each other such that each circle passes through the center of the other circle. Find the equation for the perimeter of this figure.
asked by Leah on February 1, 2011 
Math
How long is a rectangle field with a width of 3/5 mile and an area if 21/50 square mile? Use the formula A=lw to find the missing length.
asked by Amy on November 11, 2014 
science
a particle is projected vertically upward from ground with velocity 10 m/s. Find which time particle reaches highest point?
asked by Anonymous on June 18, 2016 
MATH
The odds in favor of Carl beating his friend in a round of golf are 7 : 4. Find the probability that Carl will lose. would the answer be 7/11?
asked by Maddie on February 6, 2017 
poetry
What is the poem The Jumblies by Edward Lear about? What words and/or phrases do you find interesting? How is the poem structured? What did he want us to think about? plz help thanks in advance :)
asked by Geoff on October 30, 2008 
Physics
A particle is projected vertically upward from ground with velocity 10 m/s. Find which time particle reaches highest point?
asked by Pragya on June 18, 2016 
math
The decay of 333 mg of a radioactive substance is given by A(t) = 333e0.024t, where t is time in years. Find the amount left after 17 years.
asked by allison on April 8, 2011 
science
An iron cylinder with radius 1.0 cm and length 25 cm has one end held at 250°C and the other at 20°C. Find the heatflow rate through the cylinder
asked by Pam on October 8, 2015 
math(compunded interest )
1.find the future value for the following investment : a) RM19999 at 4.5% COMPOUNDED every 2 months for 2 year b) RM 120000 at 5 3/4 percent compounded monthly for 3 1/4 years
asked by fizz on April 24, 2014 
PreCALC
Can anyone help me with this problem step by step please... Find the area inside the ellipse in the xyplane determined by the given equation x^2 y^2 ____ + ___ =1 10 25
asked by Amy on December 7, 2010 
calculus
find linear approximations for each of the following and put a bound on the error of the estimate. 1. (7.985)^1/3 using f(x)=x^1/3 and a=8 2. (.9997)^100 using f(x)=x^100 and a=1 please help explain please too
asked by C on December 9, 2010 
Pre Algebra
I am having a problem with slopes and intercepts problems. Write each equation in slopeintercept form. Find slope and yinercept. 3x  y = 14
asked by Rosalind on November 28, 2011 
Math?
I have to do this portfolio and I have read back and can’t find what I am suppose to be writing or doing help!! Misleading Media Watchdog Portfolio 6th grade
asked by Angie on September 6, 2018 
Trigononometry and plaine sperical
Find the exact values of the six trigonometric functions for each of the following angles.draw the angles in standard position 1.300 degree
asked by Jomar castillo on November 30, 2014 
ALGEBRA!!
calculate P(i) for the following polynomial p(x)=x3+2x25x+8 Find  z  for each of the following complex numbers and represent them on a complex plane. a. z=34i b. v=512i c.u=7+24i d.w=9+40i e.p=1+3i f.t=2i g.n=4 h.m=0 i.s=(√3i)2
asked by natali on October 7, 2010 
Physics
You walk 25 m south and 40 m east. Find the magnitude and direction of the resultant displacement both graphically and algebraically. Magnitude is 47.16 What is the degree?
asked by HS Senior on October 1, 2018 
Math
Plz help me to solve this Find the time in which an amount of rs.6250 amount to rs.6760 at 4% per annum,if the intrest is compounded anually.
asked by Simran on January 9, 2013 
Physics
forces of 185N and 245N act east and south respectively on an 80 kg mass.If the force of friction is ZERO , find the accleration of the mass.
asked by Jo on December 9, 2010 
college calculus
find a and b so that f(x)=x^2+ax+b has a local min at (6,5) i found the derivative: f'=2x+a then i found a 0=2x+a 0=2(6)+a 0=12+a a=12 but i can't seem to get the correct value for b. i plugged 5 into the original function, but my book says the answer
asked by kate on October 23, 2008 
precalculus PLEASE HELP!!
Find a simplified expression for cos(tan^(1)(x/5)) Evaluate cos(sin^(1)(1/11)), giving your answer as an exact value (no decimals)
asked by Anonymous on April 3, 2013 
Math
a pine tree casts a shadow that is 7.9 feet long when the sun is 80 degrees above the horizon find the height of the tree
asked by Katelynn on December 14, 2010 
calculus
Find the absolute maximum and absolute minimum values of f on the given interval [π/4, 7π/4]. (Round all answers to two decimal places.) f(t) = t + cot(t/2)
asked by Michael on March 2, 2012 
physics
A 50.0 g sample of lead starts at 22 degrees Celsius and is heated until it absorbs 8.7 X 10^2 of energy. Find the final temperature of the lead
asked by Jiskha Help on November 15, 2014 
prealg
In a pattern, the # of colored tiles used in row x is 3 to the power of x. Find the number of tiles used in rows a, 5, & 6. i don't get this problem & could use a little help, plz!
asked by kathryn on December 11, 2007 
PreCalc
Find the values of the trigonometric functions of è from the information given. (sin è, cos è, csc è, sec è, cot è) tan è = −2, sin è > 0
asked by Kelvin on March 24, 2012 
math
if three sides of a triangle are 6cm ,8cm and 10cm then find the altitude of the triangle using the largest side as base.... really need help with this question
asked by mahira on June 7, 2019 
math
In my book, it says to use a number line to find the sum of the equations. Should I draw a numberline on my paper, or just write down the answer on the paper?
asked by lily on October 22, 2009 
algebra
a window is shaped like a rectangle whose perimeter is 294 in. The length is 6 times as long as the width. Find the lengthnand the width.
asked by shelia on February 10, 2011 
Algebra
Two hikers are 22 miles apart and walking toward each other. They meet in 5 hours. Find the rate of each hiker if one hiker walks 2.2 mph faster than the other.
asked by Pat on February 24, 2017 
calculus
Find the distance, in feet, a particle travels in its first 4 seconds of travel, if it moves according to the velocity equation v(t)= −t2 + 4 (in feet/sec).
asked by Anonymous on June 15, 2015 
physics
A 50.0 g sample of lead starts at 22 degrees Celsius and is heated until it absorbs 8.7 X 10^2 of energy. Find the final temperature of the lead
asked by Princess on November 14, 2014 
Pre Algebra
Which special version of the Pythagorean Theorem can you use to find the length of any square's diagonal, d, using only the length of its side, s? plz tell me the equation!!!
asked by Labbayk on October 3, 2015 
calculusderivatives
Hello, please help me. I needed to find the derivative of f(x)= x^4 2x^3 + x +1. I got f'(x)= 4x^3 6x^2 +1. I would like to figure out the critical numbers so I can figure out where it increases and decreases, but I have no idea how to factor it... Is it
asked by mary on March 15, 2012 
calculus I
find a and b so that f(x)=x^2+ax+b has a local min at (6,5) i found the derivative: f'=2x+a then i found a 0=2x+a 0=2(6)+a 0=12+a a=12 but i can't seem to get the correct value for b. i plugged 5 into the original function, but my book says the answer
asked by kate on October 23, 2008 
Algebra
The area of a rectangular blanket in square centimetersis 40x^2+2x65. The width is 4x5cm^2. Find the dimensions of the blanket in terms of x.
asked by bailey on January 8, 2007 
geometry
A cone has a volume of 36pi cubic meters. Its height is four times its radius. Find the surface area of the cone.
asked by Piggy on March 2, 2012 
physics
A horizontal plank (m = 2.0 kg, L = 1.0 m) is pivoted at one end. A spring. (k = 1.0 x 10. 3. N/m) is attached at the other end find the angular frequence for small oscillations?
asked by shan on December 11, 2007 
Precalc
The question is solve for cosx= 0.60 on the interval [0,2pi). The answer is to be posted in radians. I don't understand how to find the answer.
asked by Katie on October 7, 2010 
math
Explain two ways that you can solve for R in the following division statement. Then, use one of your methods to find R. x^3+4x^23x=(x1)(x^2+5x+2)+R could you divide x^3+4x^23x by (x1) to get the quotion of (x^2+5x+2)+ the remainder which would be r?
asked by Matt on July 7, 2016 
Math
"Carlos started at sea level, climbed a cliff to a height of 14 m, then dived 19 m. Find the level at which his dive ended."
asked by Ali on June 11, 2016 
Math St. John's Academy
A room 5 M long and 4 m wide is surrounded by a wonder if the verandah occupies an area of 22 metre square find the width of the verandah
asked by Pragya Singh on December 27, 2017 
Math
Here is the problem: Find the missing parts of 1/200. Here are my answers: Percent= 1/2% Fraction= 1/200 Decimal= .005. Is this correct?
asked by B.B. on July 14, 2009 
Calculus!
For the function y=(e^2x)+(3x)(10), use Newton's method and the calculator method to find the x value for which y=15. Please show your work so that I can understand the question! Thank you so much!! it means alot!!
asked by Sam on March 17, 2011 
Math
Find the loss percentage if Banrap incurred a loss of RS. 310 when he sold cosmetic for RS. 1550. (In book answer is given as 25%.)
asked by Deepak on August 1, 2018 
intermediate math
the length of a rectangular plot of land is 4 times the width. of the perimeter is 600 feet, find the dimensions of the plot
asked by mary on January 28, 2013
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