Sunday
November 23, 2014

Posts by Angel


Total # Posts: 889

MATH
If C dollars are deposited in an account paying r percent annual interest, the amount after x years is A+C(1+r)*. Approximate the amount in the account after x years, when C=$100.00, r=19%, and x-15 years.
April 29, 2012

MATH
The cumulative number of car accidents from 2000 to 2010 can be modeled by the quadratic expression, C=-42x^2+924x+14,112, where x=1 corresponds to 2001, and so on until x=11 corresponds to 2010. Find the number of cumulative car accidents in 2003. Use the table of values to ...
April 29, 2012

MATH
A rectangle pen for a pet is 5 feet longer than it is wide. Give possible values for the width W of the pen if its area must be between 266 and 750 square feet, inclusively. The width of the pen from the smaller value of the width is how many feet to the larger value of the ...
April 29, 2012

math
If C dollars are deposited in an account paying r percent annual interest, approximate the amount in the account after X years if c=$250, r=2.4% and x=23 years?
April 20, 2012

math
The population P in 1995 for a state is given along with r, its annual percentage3 rate of a continuous growth. P=16 millions, r=1.2% Write the formula f(x) =Pe^yx, where r is in a decimal notation, that models the population in millions x years in 1995.
April 19, 2012

math
In 2000 the population of a state was 5 million and growing continuously at a rate of 3.4% per year. a) Write a function that models the state’s population in millions x years after 200. b) Graph f in 0,10,1 by 4,7,1 c) Estimate the state’s population in 2007.
April 19, 2012

math
Biologist have have found that the weight W of a bird and the length L of it’s wing span are related by L=kW1/3, where k is a constant. The following list L and W for one species of bird. What is the value of k? W kilograms0.1 0.4 0.8 1.1 L meters 0.399 0.634 0.798 0.888
April 19, 2012

math
The total hang time T in seconds, is given by T(h)=^h/2. Where h is the maximum height. If a person jumps 6 ft off the ground, determine for how many seconds the person is in the air.
April 19, 2012

math
find function values f(x)=9x^2+10x-8
April 19, 2012

word problem
A farmer decides to enclose a rectangular garden, using the side of a barn as one side of the rectangle. What is the maximum area that the farmer can enclose with 80 feet of fence? What should the dimensions of the garden be to give the area?
April 18, 2012

Algebra
For what values of x is x/[x(3x-4)] undefined?
April 16, 2012

Physics
Light falls on a double slit with slit separation of 2.19 × 10 −6 m, and the first bright fringe is seen at an angle of 12.7 ◦ relative to the central maximum. What is the wavelength of the light? Answer in units of nm Can the person post the steps and ...
April 10, 2012

Physics
It says incorrect. Can you explain the process?
April 10, 2012

Physics
Light falls on a double slit with slit separation of 2.19 × 10 −6 m, and the first bright fringe is seen at an angle of 12.7 ◦ relative to the central maximum. What is the wavelength of the light? Answer in units of nm
April 10, 2012

Physics
Im sorry to ask again but what equation did you use? Can you list the steps you did please? So I can answer the next few questions by myself.
April 10, 2012

Physics
A pair of narrow parallel slits separated by a distance of 0.253 mm are illuminated by the green component from a mercury vapor lamp (λ = 545.1 nm). What is the angle from the central maximum to the first bright fringe on either side of the central maximum? Answer ...
April 10, 2012

Physics
And where did you get those numbers?
April 10, 2012

Physics
Excuse me what was the equation you used? Because the answer is wrong.
April 10, 2012

Physics
A double-slit interference experiment is performed with light from a laser. The separation between the slits is 0.58 mm, and the first-order maximum of the interference pattern is at an angle of 0.060 ◦ from the center of the pattern. What is the wavelength of the ...
April 10, 2012

calc
Let f(x)=x^3-3x^2 find the absolute maximum value of f(x) on the interval [1,4]? 22 hours ago - 3 days left to answer
April 5, 2012

calc
A____________B 9 miles is between A and B? at 3pm Andy began travelling South at a rate of 4mi/hr from point A at the same time Bill began travelling West at a rate of 5mi/hr from point B to A both stop wlking when Bill reaches point A What time will the distance between Bill ...
April 5, 2012

11th grade algebra 2
(1-7) write each function in vertex form (8-10) write each funtion in standard form? 1) Y=x^2+3x-10 2) Y=x^2-9x 3) Y=X^2+x 4) Y=x^2+5x+4 5) Y=4x^2+8x-3 6) Y=(3/4)x^2+9x 7) Y=-2x^2+2x+1 8) Y=(x-3)^2+1 9) Y=2(x-1)^2-3 10)Y=-3(x+4)^2+1
April 5, 2012

Algebra 2
(1-7) write each function in vertex form (8-10) write each funtion in standard form? 1) Y=x^2+3x-10 2) Y=x^2-9x 3) Y=X^2+x 4) Y=x^2+5x+4 5) Y=4x^2+8x-3 6) Y=(3/4)x^2+9x 7) Y=-2x^2+2x+1 8) Y=(x-3)^2+1 9) Y=2(x-1)^2-3 10)Y=-3(x+4)^2+1
April 5, 2012

Physics
Sherlock Holmes examines a clue by holding his magnifying glass (with a focal length of 29.8 cm) 10.4 cm away from an object. Find the image distance. Answer in units of cm Find the magnification.
April 1, 2012

physics
disregard
April 1, 2012

physics
A ray of light of vacuum wavelength 550 nm traveling in air enters a slab of transparent material. The incoming ray makes an angle of 37.4◦ with the normal, and the refracted ray makes an angle of 22.0◦ with the normal. Find the index of refraction of the ...
April 1, 2012

Physics
An object 3.35 cm tall is placed 10.8 cm in front of a mirror, which creates an upright image that is 5.61 cm in height. a) What is the magnification of the image?
April 1, 2012

Physics
disregard
April 1, 2012

Physics
The image of a crayon appears to be 20.6 cm behind the surface of a convex mirror and is 1.64 cm tall. The mirror’s focal length is 54.3 cm. a) How far in front of the mirror is the crayon positioned? Answer in units of cm I keep on getting it wrong so the answer & ...
April 1, 2012

physics
I keep getting error
April 1, 2012

physics
do I put my calculator in degrees?
April 1, 2012

physics
A ray of light traveling in air strikes the surface of a liquid. If the angle of incidence is 33.5◦ and the angle of refraction is 19.8◦, find the critical angle for light traveling from the liquid back into the air. Answer in units of◦
April 1, 2012

Physics
do I have to convert GHz?
April 1, 2012

Physics
What is the wavelength of a radar signal that has a frequency of 30 GHz? The speed of light is 3 × 10^8 m/s. Answer in units of m Giving me the formula is just fine
April 1, 2012

Physics
Consider a concave mirror with a focal length of 14.04 cm. b) Find the image distance when the object distance is 7.02 cm c) Find the magnification of the image for part b Giving me the formulas is just fine
April 1, 2012

Global History
Sorry this is not very detailed...I checked my textbook but couldn't find any information. How did the Islamic Conquest impact India? Thanks so much in advance :)
March 31, 2012

Physics
A spherical glass ornament is 7.00 cm in diameter. An object is placed 11.8 cm away from the ornament. a) Where will its image form? b) What is the magnification of the image
March 29, 2012

Physics
A concave makeup mirror is designed so that a person 25.3 cm in front of it sees an upright image at a distance of 54.0 cm behind the mirror. a) What is the radius of curvature of the mirror? Answer in units of cm
March 29, 2012

physics
How did you get 20.6?
March 28, 2012

Physics
The image of a crayon appears to be 20.6 cm behind the surface of a convex mirror and is 3.32 cm tall. The mirror’s focal length is 52.6 cm. a) How far in front of the mirror is the crayon positioned? b) Calculate the magnification of the image
March 27, 2012

Physics
Consider a concave mirror with a focal length of 14.98 cm. a) Find the image distance when the object distance is 14.98 cm. (Answer with −1000 if the image does not exist.) That's the whole question..
March 27, 2012

Physics
Why is it infinity?
March 27, 2012

Physics
Consider a concave mirror with a focal length of 14.98 cm. a) Find the image distance when the object distance is 14.98 cm
March 27, 2012

Physics
Gamma-ray bursters are objects in the universe that emit pulses of gamma rays with high energies. The frequency of the most energetic bursts has been measured at around 3.0 × 10 21 Hz. The speed of light is 3 × 10 8 m/s. What is the wavelength of these gamma rays?
March 27, 2012

Physics
What is the frequency of an electromagnetic wave if it has a wavelength of 1.4 km? The speed of light is 3 × 10 8 m
March 27, 2012

English
what kind of sentence is this? Arabic numbers were being used for the first time the concept "0" was baffling to many they wondered how a zero could for standing.
March 27, 2012

math
google it
March 20, 2012

AP History
What was the Talented Tenth? Who proposed it & why?
March 20, 2012

AP History
What was the impact of Eli Whitney's interchangeable parts concept and what impact did Eli Whitney's cotton gin have? Why was the cotton gin so important?
March 20, 2012

math
20 divided by 4
March 20, 2012

math
one fourth of the childern in room 20 have dogs how many kids have dogs
March 20, 2012

Chemistry
Dinitrogen tetroxide decomposes according to N2O4 (g) = 2NO2 (g) In a certain experiment, N2O4(g) at an initial pressure of 0.554 bar is introduced into an empty reaction container; after equilibrium is established, the total pressure is 0.770 bar. A quantity of NO2(g) is ...
March 19, 2012

6 grade math
120lb _ _ $15 = $1
March 19, 2012

geometry
she probably meant bases
March 18, 2012

Political Science
True.
March 14, 2012

chemistry
what type of reaction is Al+S8=Al2S3
March 14, 2012

geometry
Well, across line L, it would be just the opposite. It would basically be a backwards D. Then across line M it would be a regular looking D again.
March 13, 2012

rosemont
a pizza was sliced 10 pieces. bill ate 2/10 of the pizza how much of the pizza was left?
March 10, 2012

math
The answer is D 5ft by 6ft.
March 6, 2012

13
c. is wrong!
March 4, 2012

Statistics
Suppose that the birth weight of newborn babies in the U.S is normally distributed with a mean of 7 pounds and a standard deviation of 1.6 pounds. Let the random variable X be the birth weight of a randomly selected record of live birth. a) What is the distribution of X? b) ...
March 2, 2012

Statistics
Suppose it is observed that, on average, 35 people are admitted to the intensive care unit of a particular hospital every week. Let the random variable X represent the number of people admitted to this intensive care unit on any particular day. a) What is the distribution of X...
March 2, 2012

Statistics
Suppose a basketball player, Player A, made 80% of her free throw attempts last season and that she continues to shoot free throws at the same rate. Assume that free throw attempts are independent. Let the random variable X be the number of free throws that player A makes in ...
March 2, 2012

Statistics
a) What is the distribution of X? b) Find the mean and standard deviation of X. c) Find the probability that player A makes exactly 10 free throws. d) Find the probability that player A makes at least 8 free throws.
March 2, 2012

Statistics
Suppose a basketball player, Player A, made 80% of her free throw attempts last season and that she continues to shoot free throws at the same rate. Assume that free throw attempts are independent. Let the random variable X be the number of free throws that player A makes in ...
March 2, 2012

physics please help :/
A 0.50-kg block, starting at rest, slides down a 30.0° incline with kinetic friction coefficient 0.30 (the figure below). After sliding 84 cm down the incline, it slides across a frictionless horizontal surface and encounters a spring (k = 33 N/m). (a) What is the maximum ...
March 1, 2012

physics
A 0.50-kg block, starting at rest, slides down a 30.0° incline with kinetic friction coefficient 0.30 (the figure below). After sliding 84 cm down the incline, it slides across a frictionless horizontal surface and encounters a spring (k = 33 N/m). (a) What is the maximum ...
February 29, 2012

physics
A ski trail makes a vertical descent of 77 m. A novice skier, unable to control his speed, skis down this trail and is lucky enough not to hit any trees. If the skier is moving at 17 m/s at the bottom of the trail, calculate the total work done by friction and air resistance ...
February 29, 2012

physics
A 0.50-kg block, starting at rest, slides down a 30.0° incline with kinetic friction coefficient 0.30 (the figure below). After sliding 84 cm down the incline, it slides across a frictionless horizontal surface and encounters a spring (k = 33 N/m). (a) What is the maximum ...
February 28, 2012

physics
A ski trail makes a vertical descent of 77 m. A novice skier, unable to control his speed, skis down this trail and is lucky enough not to hit any trees. If the skier is moving at 17 m/s at the bottom of the trail, calculate the total work done by friction and air resistance ...
February 28, 2012

engineering
A steady, two-dimensional velocity field is given by V = (u, v) = (1.35 + 2.78x - 0.896y)i + (3.45x + cx - 2.78y)j Calculate constant c such that the flow field is irrotational.
February 27, 2012

Chemistry
If you can show me an example of one problem, I have no idea how to approach this. Calculate where the number 40.67 came from. Use the Clapeyron-Clausisus equation. Assuming that delta H vap does not change with temperature, this equation relates the change in vapor pressure ...
February 26, 2012

science
a ball rolls 5cm in 5 seconds what is the speed of the ball?
February 25, 2012

math
what does 7/10 mean
February 24, 2012

Business Math
Model the data using an exponential function f(x) = Ab^x. x ,0 ,1 ,2 f(x) ,800 ,480 ,288 Like 800-480=320 and 480-288=192 How do I find the exponential form? Thank you.
February 22, 2012

Algebra
As Sales Manager for Montevideo Productions, Inc., you are planning to review the prices you charge clients for television advertisement development. You currently charge each client an hourly development fee of $2,600. With this pricing structure, the demand, measured by the ...
February 21, 2012

College Math
Only 43% ofthe carbon-14 in an artifact remains. How old is the artifact? Would the answer be less than the half life?
February 19, 2012

Physics
it says it was incorrect
February 16, 2012

Physics
The body of a 1297 kg car is supported on a frame by four springs. The spring constant of a single spring is 1.24 × 10 4 N/m. Four people riding in the car have a combined mass of 259 kg. When driven over a pothole in the road, the frame vibrates and for the first ...
February 16, 2012

Physics
this is da girl angel bro ~~~
February 16, 2012

Physics
A mass of 0.40 kg is attached to a spring and is set into vibration with a period of 0.15 s. What is the spring constant of the spring? Answer in units of N/m
February 16, 2012

Physics
A harmonic wave is traveling along a rope. The oscillator that generates the wave completes 50.0 vibrations in 26.6 s. A given crest of the wave travels 355 cm along the rope in a time period of 12.1 s. What is the wavelength? Answer in units of m
February 16, 2012

Physics
The body of a 1269 kg car is supported on a frame by four springs. The spring constant of a single spring is 2.75 × 10 4 N/m. Four people riding in the car have a combined mass of 256 kg. When driven over a pothole in the road, the frame vibrates and for the first ...
February 16, 2012

Physics
What is the free-fall acceleration in a location where the period of a 0.594 m long pendulum is 1.55 s s? Answer in units of m/s
February 16, 2012

Physics
The distance between two successive crests of a certain transverse wave is 1.42 m. Eight crests pass a given point along the direction of travel every 19.5 s. Calculate the wave speed. Answer in units of m/s
February 16, 2012

Physics
Microwaves travel at the speed of light, 3.00× 108 m/s. When the frequency of microwaves is 3.67× 109 Hz, what is their wavelength? Answer in units of m
February 16, 2012

Physics
Part(1 of 3) You dip your finger into a pan of water twice each second, producing waves with crests that are separated by 0.17 m. Determine the frequency of these water waves. Answer in units of Hz Part(2 of 3) Determine the period of these water waves. Answer in units ...
February 15, 2012

Physics
Oh I'm sorry. Really stressed and can't think straight.
February 15, 2012

Physics
What would be the wavelength of the wave produced by this tuning fork in water in which sound travels at 1500 m/s?
February 15, 2012

Physics
A tuning fork produces a sound with a frequency of 277 Hz and a wavelength in air of 1.21 m. What value does this give for the speed of sound in air? Answer in units of m/s
February 15, 2012

Physics
A piano emits frequencies that range from a low of about 28 Hz to a high of about 4200 Hz. Find the maximum wavelength in air attained by this instrument when the speed of sound in air is 336 m/s. Answer in units of m
February 15, 2012

Physics
I keep getting the question wrong. I think I put it wrong in my caculator. I put (2<Pie>.594)^2.594/(1.55^2)
February 15, 2012

Physics
Last question.. sorry PL = Pie?
February 15, 2012

Physics
By following your equation I got: 5.797880106 If I rearrange it would be: T^2 = 2(Pie)L/G then what?
February 15, 2012

Physics
I kinda have no clue what you responded. The equation I have is: T=2(Pie)*Sqt(L/G) I need to re-arrange that..
February 15, 2012

Physics
What is the free-fall acceleration in a location where the period of a 0.594 m long pendulum is 1.55 s s? Answer in units of m/s^2 Show equation too please.
February 15, 2012

Statistics
A manufacturer of a low-tar cigarette claims that their cigarettes contain an average of 16.3 mg of tar with a standard deviation of 3.1 mg per cigarette. How many sample cigarettes must the manufacturer observe to be 99% confident that the width of the confidence interval is ...
February 12, 2012

Algebra
Nevermind I figured it out. Thanks for noting people. So called "tutors".
February 2, 2012

Algebra
Solve this quadratic eqution: 6a^2 + 13a + 6=0 (^2 means squared...sorry for confusion...)
February 2, 2012

Physics
A worker drives a 0.509 kg spike into a rail tie with a 2.08 kg sledgehammer. The hammer hits the spike with a speed of 63.3 m/s. If one fifth of the hammer’s kinetic energy is converted to the internal energy of the hammer and spike, how much does the total ...
February 1, 2012

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