# Shelby

Popular questions and responses by Shelby-
## Algebra

An aircraft factory manufactures airplane engines. The unit cost C (the cost in dollars to make each airplane engine) depends on the number of engines made. If x engines are made, then the unit cost is given by the function =Cx+−0.2x248x21,748 . What is

*asked on March 17, 2017* -
## Geometry

c. Given angle ABC has angle bisector BD, where AB = CB, find the value of x if AD = 5x + 10 and DC = 28 - x. Do I just set them equal to each other ?

*asked on July 4, 2019* -
## Physics

1. The figure shows a 100-kg block being released from rest from a height of 1.0 m. It then takes 0.53 s for it to reach the floor. What is the mass m of the block on the left? There is no friction or mass in the pulley, and the connecting rope is very

*asked on December 11, 2016* -
## economics

Suppose that people consume only three goods, as shown in this table: (5 Marks) Tennis Balls Tennis Racquets Gatorade 1998 price $2 $40 $1 1998 quantity 100 10 200 1999 price $2 $60 $2 1999 quantity 100 10 200 What is the percentage change in the price of

*asked on September 25, 2006* -
## PHYSICS HELP!

A typical propeller of a turbine used to generate electricity from the wind consists of three blades as in the figure below. Each blade has a length of L = 33 m and a mass of m = 415 kg. The propeller rotates at the rate of 21 rev/min. 120degree angle

*asked on October 31, 2012* -
## Statistics

A university has 1,000 computers available for students to use. Each computer has a 250-gigabyte hard drive. The university wants to estimate the space occupied on the hard drives. A random sample of 100 computers showed a mean of 115 gigabytes used with a

*asked on October 27, 2013* -
## math

The area of a parallelogram is 420 centimeters squared and the height is 35 cm. Find the corresponding base. Be sure to show all work and label your answer

*asked on May 4, 2013* -
## College algebra

Find an nth degree polynomial. N=4, 2i and 3i are zeros, f (-1)=50

*asked on April 15, 2018* -
## physics

A ball is thrown upward at a speed v0 at an angle of 52.0˚ above the horizontal. It reaches a maximum height of 7.3 m. How high would this ball go if it were thrown straight upward at speed v0?

*asked on February 18, 2012* -
## Chemistry

The density of dry air measured at 25 degrees Celsius is 1.19x10 to the negative 3rd power. What is the volume of 50.0g of air?

*asked on September 23, 2012* -
## Geometry

a. Find the length of the midsegment of an equilateral triangle with side lengths of 12.5 cm. b. Given that UT is the perpendicular bisector of AB, where T is on AB, find the length of AT given AT = 3x + 6 and TB = 42 - x. c. Given angle ABC has angle

*asked on July 4, 2019* -
## geometry

Find angle A if angle A is supplementary to angle B, angle B is supplementary to angle C, angle B equals 12x plus 8, and angle C equals 8x minus 8

*asked on September 10, 2012* -
## Trigonometry

Graph the function y=2sin(x-2pi/3). To draw the graph, plot all x-intercepts, minima and maxima within on period. I need to graph at least 5 points. I have -pi, 0, pi, 2pi, 3pi, and 4pi along the x-axis

*asked on March 24, 2014* -
## physics

A flat (unbanked) curve on a highway has a radius of 220m. A car rounds the curve at a speed of 25m/s. What is the minimum coefficient of friction that will prevent sliding?

*asked on March 28, 2015* -
## Math

Given that force 1=60 pounds and force 2=90 pounds, find the angle between the forces if the magnitude of the resultant force is 50 pounds. Round answer to the nearest degree and show work.

*asked on April 27, 2011* -
## phyics

Suppose a runner completes one lap around a 400-m track in a time of 50 s. Calculate the average velocity of the runner. Express your answer in meters per second to the nearest integer.

*asked on September 12, 2015* -
## math

Jon begins jogging at a steady 3m/sec down the middle of lane one of a public track. Laura starts even with him in the center of lane two but moves 4m/sec. At the instant they begin, Ellie is located 100 meters down he track in lane four, and is heading

*asked on October 2, 2012* -
## math

answers to what kind of shoes does a frog wear(the coordinate thingies only)

*asked on January 18, 2011* -
## MUSIC

1. What is the difference between composition and improvisation? Choose the correct. A. Composition is the art of making music spontaneously, while improvisations are carefully planned. B. Improvisation is the art of making music spontaneously, while

*asked on February 22, 2016* -
## Math

You are buying a fence to enclose a garden that has an area of 360 square feet. x + 9 The bottom of garden x side of garden a) What is the width of the area to be enclosed? Answer in units of ft b) How much fencing do you need? Answer in units of ft

*asked on January 28, 2015* -
## geometry

a tree grew at a 3 degree slant from the vertical. at a point 60 feet from the tree, the angle of elevation to the top of the tree is 14 degrees. find the height of the tree to the nearest tenth of a foot.

*asked on December 11, 2012* -
## biology

i need a short story about a ecosystem that is disturbed and undergoes succession

*asked on May 17, 2011* -
## Algebra

Consider the following matrix. A = 7, -5 -4, 3 Choose the correct description of A Find A^−1 if it exists. Answer either Choice 1, or Choice 2: CHOICE 1: A is nonsingular; that is, it has an inverse. A^-1 = _________ or CHOICE 2 : A is singular; that is,

*asked on March 17, 2017* -
## Calculus

A farmer has 120 meters of wire fencing to make enclosures for his pigs and cows. The rectangular enclosure he is considering will have one side up against a barn (in the center of one side that is 150 meters long, so the enclosure won't require fencing

*asked on October 30, 2012* -
## College Chemistry

Two moles of Mg and five moles of O2 are placed in a reaction vessel, and then the Mg is ignited to produce Mg (F.W.= 40.31 g/mole). What is the actual mole ratio, the calculated mole ratio, how many moles of MgO are formed, and what is the weight of MgO

*asked on October 21, 2012* -
## Physics

A car slows from 17 m/s to 2.0 m/s at a constant rate of 2.1 m/s2. How many seconds are required before the car is traveling at 2.0 m/s?

*asked on September 13, 2012* -
## math

out of 32 students in a class 5 said they ride their bikes to school based on these results predict how many of the 800 students in the school ride their bikes to school

*asked on November 30, 2011* -
## calculus

find the area of the regions enclosed by the lines and curves. x+y^2=0 and x+3y^2=2 i know the answer is 8/3, but i don't know how to get it.

*asked on April 29, 2010* -
## 12th grade math

What is the distance between the origin and the point (5, 12)? If necessary, round your answer to two decimal places.

*asked on March 10, 2010* -
## Physics

1. The figure shows a 100-kg block being released from rest from a height of 1.0 m. It then takes 0.53 s for it to reach the floor. What is the mass m of the block on the left? There is no friction or mass in the pulley, and the connecting rope is very

*asked on December 11, 2016* -
## Physics

A VW Beetle goes from 0 to 46.0 mi/h with an acceleration of +2.35 m/s2. (a) How much time does it take for the Beetle to reach this speed? (b) A top-fuel dragster can go from 0 to 46.0 mi/h in 0.750 s. Find the acceleration (in m/s2) of the dragster.

*asked on September 12, 2016* -
## math

A car traveled 63 miles on 3 gallons of gas. What proportion can you set up to determine how many miles, m, the car can travel on 7 gallons of gas?

*asked on March 7, 2016* -
## physics

A car with a mass of 2,000 kg has a kinetic energy of 900,000 J. How fast is it traveling?

*asked on May 21, 2014* -
## Calculus Rate of Change

Find the average rate of change h(x)=2x^2-4 from x=2 to x=6 Simplify your answer as much as possible

*asked on March 25, 2014* -
## Alg 3

Put the following equations in standard form. State the center and the radius. x^2-5x+y^2+4y=-3 I get how to end up with (-2.5,2), what is the radius?

*asked on April 3, 2013* -
## MATH

Radical equation, with a graphing calculator to the nearest thousandth?? 1 over /pi x-3+ sq2over/ 2.7x = 1.8??

*asked on March 11, 2013* -
## Physics

A force of 20 N acts toward the west. Another force acts at the same point so that the resultant of the two forces is zero. What is the magnitude and direction of the second force?

*asked on March 4, 2013* -
## physics

A bus is moving at 30 m/s when the driver steps on the brakes and brings the bus to a stop in 2.6 s. What is the average acceleration of the bus while braking?

*asked on September 16, 2012* -
## Biochemistry

In naming polypeptides, if asparagine is the second peptide from the N terminal, would it be named asparagyl? Would aspartate be aspartyl if it is the second peptide from the N terminal of a polypeptide?

*asked on July 25, 2012* -
## child care management

According to leeds,at snack time,children sould be given _ of each food foreach yea of theie lives.

*asked on June 15, 2012* -
## physics

A 2490 kg demolition ball swings at the end of a 35.9 m cable on the arc of a vertical circle. At the lowest point of the swing, the ball is moving at a speed of 7.26 m/s. Determine the tension in the cable.

*asked on February 19, 2012* -
## physics

Boat A negotiates a curve whose radius is 336 m. Boat B negotiates a curve whose radius is 160 m. Each boat experiences the same centripetal acceleration. What is the ratio of the speed of boat A to that of boat B?

*asked on February 19, 2012* -
## physics

A golfer hits a shot to a green that is elevated 3.0 m above the point where the ball is struck. The ball leaves the club at a speed of 19.4 m/s at an angle of 45.0˚ above the horizontal. It rises to its maximum height and then falls down to the green.

*asked on February 18, 2012* -
## physics

After leaving the end of a ski ramp, a ski jumper lands downhill at a point that is displaced 44.5 m horizontally from the end of the ramp. His velocity, just before landing, is 15.4 m/s and points in a direction 35.1 ° below the horizontal. Neglecting

*asked on February 18, 2012* -
## geometry

find the measures of the interior angles.. (triangle) 110-x , 3x-10, 2x write equation too .

*asked on November 2, 2011* -
## math

when a child flying a kite has let out 50 m of string the string makes an angle of 55 degrees with the ground. how high is the kite

*asked on January 20, 2011* -
## Math

The average of the first 4 numbers is 14. The average of the next 6 numbers is 25. What is the average of all 10 numbers. Can you explain how to calculate this please.

*asked on January 21, 2010* -
## English 1

Communism was the form of government used on the farm. Using communist ideals of your model redesign the administration at your school. In a labeled diagram, show the government in your school for the next ten years

*asked on November 2, 2009* -
## Grammar

Are these sentence's punctuated correctly? Differential diagnoses include: Diabetes, adult-onset Cholelithiasis, acute Endocarditis, subacute This year she'll have a breast augmentation, and next year she will have an abdominoplasty. It should snow in the

*asked on July 13, 2009* -
## math

Evaluate 27^ -4/3 Thanks- We're stumped- missing something

*asked on January 19, 2009* -
## math

Water is leaking out of an inverted conical tank at a rate of 11400 cm^3/min at the same time that water is being pumped into the tank at a constant rate. The tank has height 8.0m and the the diameter at the top is 3.5m. If the water level is rising at a

*asked on March 25, 2008* -
## physics

The cable of an elevator of mass = 5320 kg snaps when the elevator is a rest at one of the floors of a skyscraper. At this point the elevator is a distance = 31.6 m above a cushioning spring whose spring constant is = 11700 N/m. A safety device clamps the

*asked on March 7, 2008* -
## Chemistry- Stoichiometry

"Why must a chemical reaction be balanced before it can be used in stoichiometry?" I mean, I get it, that the equation will be off if it doesn't start out balanced, but, why? How do I phrase that?

*asked on September 27, 2007* -
## math..percents

Craig wants to buy some software for his computer. The company that makes the software sells it to a software distributor for $30. The distributor adds 15% to the price and then sells it to the store. The store adds 25% on top of the price they pay for it

*asked on June 16, 2006* -
## Math

I bought 10 bananas. Each weighed 50 grams. If the price for bananas was 6.00 per kilogram, how much did I pay

*asked on April 21, 2020* -
## algebra 2

use the matrix tool to solve the system of equations choose the correct ordered pair 4x-7y=-12 -2x+6y=11

*asked on March 11, 2020* -
## algebra

h = -16t2 + 32t + 84. find the maximum height how many seconds will it take to reach the ground

*asked on May 10, 2019* -
## social studies

The addition of which territories increased Spanish power under Charles V? A. the Holy Roman Empire and the Netherlands B. Turkey and Egypt C. Italy and Great Britain D. France and northern Africa Which of the following supported the arts in Spain, leading

*asked on November 9, 2018* -
## Math

i need help with the global convergence practice can someone please help?

*asked on October 25, 2018* -
## History

can someone please help me with this test I am stuck:(

*asked on October 12, 2018* -
## Apush History

Under the Articles of Confederation, why was the government unable to maintain order and regulate activities in the states? In what ways did the new U.S. Constitution seek to fulfill these functions of government

*asked on September 11, 2018* -
## Funny

I can be just one or I can be many. I can be most annoying.

*asked on July 3, 2018* -
## chem

1. Since the gas in your graduated cylinder is a mixture of butane and water vapor, you must determine the partial pressure of the butane, Pbutane, alone. To do this, consult a reference and record the partial pressure of the water vapor, Pwater, at the

*asked on March 8, 2018* -
## Math

The width of a rectangular garden is 2 feet more than 1/3 of its length. The perimeter is 52 feet. Find the dimensions of the rectangle.

*asked on November 15, 2017* -
## Algebra

The Peterson family takes their clothes to the local cleaners. The table below gives the number of coats, shirts, and dresses they had cleaned over the course of three months. They had no other items cleaned there. (January) 5 coats, 5 shirts, 6 dresses

*asked on March 16, 2017* -
## Math

in a fifth grade class, 3/4 of the students like to go to the movies. of the students who like to go to the movies, 2/3 of them like action movies. of the students who like to go to action movies, 4/5 of them also like comedies. what fraction of the

*asked on January 27, 2017* -
## science

What causes the current to move through a battery?

*asked on November 19, 2016* -
## Physics

The captain of a plane wishes to proceed due west. The cruising speed of the plane is 255 m/s relative to the air. A weather report indicates that a 39.0-m/s wind is blowing from the south to the north. In what direction, measured with respect to due west,

*asked on September 12, 2016* -
## Physics

In the absence of air resistance, a projectile is launched from and returns to ground level. It follows a trajectory similar to that shown in Figure 3.10 and has a range of 29 m. Suppose the launch speed is doubled, and the projectile is fired at the same

*asked on September 12, 2016* -
## Physics

A horizontal rifle is fired at a bull's-eye. The muzzle speed of the bullet is 640 m/s. The gun is pointed directly at the center of the bull's-eye, but the bullet strikes the target 0.028 m below the center. What is the horizontal distance between the end

*asked on September 12, 2016* -
## Physics

A bird watcher meanders through the woods, walking 1.13 km due east, 1.01 km due south, and 3.95 km in a direction 49.8 ° north of west. The time required for this trip is 1.965 h. Determine the magnitudes of the bird watcher's (a) displacement and (b)

*asked on September 12, 2016* -
## Science

It can be inferred from the passage that radioactive dating is important for estimating the age of A) all known meters B) all existing planets C) the earth D) the trees

*asked on August 11, 2016* -
## physics

In a city grid, each block on the east-west streets is 180 meters long. Each block on the north-south streets is also 180 meters long. A walker walks 4 blocks north and then 3 blocks east. How much farther did the walker travel than the actual distance

*asked on June 27, 2016* -
## penn foster

1. A 30 kg dog is receiving fluids at a rate of 40 mL/hour. It needs a drug added to 500 mL of fluids so that it receives 2 mg/kg each hour. The drug has a strength of 2%. What volume of drug will you add? A.15ml B.37.5ml C.12.5ml D.3ml

*asked on May 25, 2016* -
## Latin

Translation Help: Where do Ablatives and Genitives fit into a Latin sentence? How do you tell if a prepositional phrase is with an Ablative or Accusative?

*asked on May 22, 2016* -
## Physics

The figure (Figure 1) shows a model of a crane that may be mounted on a truck.A rigid uniform horizontal bar of mass m1 = 80.0 kg and length L = 5.30 m is supported by two vertical massless strings. String A is attached at a distance d = 1.90 m from the

*asked on March 22, 2016* -
## physics

You throw a 0.15 kg ball straight upward from ground level with an initial speed of 15 m/s. (Yes, from ground level. This is to make the calculations easier. If it bothers you, imagine you are standing in a dugout.) Your friend throws a 0.09 kg lump of

*asked on February 28, 2016* -
## Politics

The nerve center of the American Presidency is

*asked on June 15, 2015* -
## Algebra

Find the following sum: 9 + 10 + 11 + ... + 87

*asked on January 29, 2015* -
## Chemistry

How many mL of 0.122 M Na2CO3 would be needed to precipitate all of the copper ions in 23.7 mL of 0.167 M CuSO4? How many grams of CuCO3 could be recovered?

*asked on November 4, 2014* -
## Math

A kitchen floor measures 10ft by 12 ft. Calculate the minimum area and maximum area using the greatest possible error

*asked on October 27, 2014* -
## Algebra

The cost for a student ticket to a basketball game is $1 and a non student ticket is $2. The total sales for the game were $460 with 360 tickets sold, how many student tickets were sold?

*asked on October 20, 2014* -
## physics

At the top of a hill, a roller coaster has 67,500 J of kinetic energy and 290,000 J of potential energy. Gradually, the roller coaster comes to a stop due to friction. If the roller coaster has 30,000 J of potential energy when it stops, how much heat

*asked on May 21, 2014* -
## math

missing dimension, 14yd, v=489yd3

*asked on April 2, 2014* -
## west morgan

find missing dimension cone, r=5in, v=487in3

*asked on April 2, 2014* -
## Chemistry

What is the molarity of an aqueous solution that is 6.44% glucose (C6H12O6) by mass? (Assume a density of 1.03 g/mL for the solution.)

*asked on March 16, 2014* -
## physics

A 12.0 g bullet is fired into a 13.9kg wooden block that is hanging straight down, suspended by a 2.00 m length of light line. The bullet has a muzzle velocity of 94.2 m/s. When the bullet hits the block, the bullet stays in the block. The block swings

*asked on March 15, 2014* -
## English

A verb phrase that acts as a noun is called a? participial. adverbial. infinitive. gerund. Which of the following is the prepositional phrase in the sentence below? Applause came from the bleachers. A) Applause came B) came from C) from D) from the

*asked on January 12, 2014* -
## Physics

When the end of a particular garden hose is held at a height of 1m, water flows out of it at 8 cm/s. What is the difference in fluid pressure between the end of the hose and a portion resting on the ground? Suppose I cover half of the area at the end with

*asked on December 5, 2013* -
## Physics

Seawater has a density of about 1024 kg/m^3. In fresh water, the water line on a certain rectangular raft (8.8cm thick) moves 3.2 cm when a load of cargo is placed on it. How much will the same load of cargo move the water line in seawater? What is the

*asked on December 5, 2013* -
## Physics

The gravitational acceleration on the surface of Mercury is 0.38 times that of Earth. Its radius is also about 0.38 times that of the Earth. What is the ratio of the density of Mars to that of Earth?

*asked on December 5, 2013* -
## Physics

A particular asteroid has a circular orbit about the Sun with a radius of 450 million miles. How long does it take to go around the sun? Compare the prediction of Kepler's 2nd law to a direct computation with Newton's 2nd law. How much area does the line

*asked on December 5, 2013* -
## Physics

Placing a 215 g mass on a vertical spring causes a stretch of 5.1 cm. The mass is released at t=0 with y=0.15m (higher than the equilibrium hanging length) with a velocity of v=-1.3 m/s. What is the spring constant of the spring? What is the amplitude of

*asked on December 5, 2013* -
## Physics

A particular piano wire has middle C (261.7 Hz) for its second harmonic. The wire's length is 2.7m. What is the speed of the wave in the wire? If the wire has 270 lbs of tension what is its linear density? What is the wavelength of this tone emitted into

*asked on December 5, 2013* -
## biology

Which provides more energy for the cell to perform its functions, cellular respiration or fermentation? Explain.

*asked on December 3, 2013* -
## science

Explain the following statement: "scientific knowledge is the result of a great deal of debate and confirmation within the science community."

*asked on October 18, 2013* -
## Physics

A dock worker applies a constant horizontal force of 80.0N to a block of ice on a smooth horizontal floor. The frictional force is negligible. The block starts from rest and moves 10.0m in the first 6.00s. What is the mass of the block of ice?

*asked on October 2, 2013* -
## math

a rectangle with a perimeter 70 feet can have an area of 150 ft^2. use A(x) to demonstrate this fact algebraically and graphically.

*asked on August 15, 2013* -
## Math

What descriptive statistical information is needed in order to determine if a current temperature of 75-degree is a departure from the average temperature of 65 for that date of the year in that particular location, if the record low is 35 and record high

*asked on June 11, 2013* -
## chemistry

If 15 grams of table salt is used how many moles of sodium sulfate are produced

*asked on May 14, 2013*