# a

Popular questions and responses by a-
## statistics

In the game of roulette, a wheel consists of 38 slots numbered 0, 00, 1, 2,..., 36. To play the game, a metal ball is spun around the wheel and is allowed to fall into one of the numbered slots. If the number of the slot the ball falls into

*asked on October 11, 2017* -
## calculus2

Use cylindrical shells to find the volume V of the solid. A sphere of radius r

*asked on June 24, 2018* -
## math

A man makes a simple discount note with a face value of $2,200, a term of 140 days, and a 9% discount rate. Find the discount.

*asked on May 16, 2015* -
## Calculus

Sketch the vector field F⃗ (r⃗ )=2r⃗ in the plane, where r⃗ =⟨x,y⟩. Select all that apply. A.All the vectors point away from the origin. B. The vectors increase in length as you move away from the origin. C. All the vectors point toward the

*asked on October 10, 2015* -
## math

A circular coffee table has a diameter of 5 ft. What will it cost to have the top refinished if the company charges $3 per square foot for the refinishing? $15.00?

*asked on September 16, 2009* -
## Calculus

Find the surface area of the part of the sphere x2+y2+z2=81 that lies above the cone z=√(x2+y2)

*asked on December 6, 2015* -
## math

For what value of k does the equation x2 + kx + 9have: Two distinct real roots One real root No real root

*asked on March 6, 2019* -
## ALGEBRA CHECK ANSWERS

Solve each equation by graphing the related function. If the equation has no real-number solution, write no solution. NOTE: when I write + it has a minus on the bottom too x^2+7=0 a. x= +7 b. x = +3.5 c. x= 0 d. no solution *** 3x^2=0 a. +3 b. +1/3 c. 0

*asked on April 4, 2017* -
## phy

A blue ball is thrown upward with an initial speed of 20.6 m/s, from a height of 0.8 meters above the ground. 2.5 seconds after the blue ball is thrown, a red ball is thrown down with an initial speed of 8.2 m/s from a height of 23.7 meters above the

*asked on September 13, 2011* -
## precalc

what is the value of cot 2π/5? how do i find the answer?

*asked on September 14, 2015* -
## Calculus

Determine a quadratic function f(x)=ax^2 + bx + c if its graph passes through the point (2,19) and has a horizontal tangent at the point (-1, 8)

*asked on July 14, 2020* -
## calculus

For which value of x on the graph of 𝑓 (𝑥) = (x+1)(x+2) is parallel to the line 3𝑥 − 𝑦 − 5 = 0 a. −1 b. 1 c. 3 d. 0

*asked on July 14, 2020* -
## physics

Two cars start from rest at a red stop light. When the light turns green, both cars accelerate forward. The blue car accelerates uniformly at a rate of 4.6 m/s2 for 4.4 seconds. It then continues at a constant speed for 8.5 seconds, before applying the

*asked on September 13, 2011* -
## Math

(a) What is the escape speed on a spherical asteroid whose radius is 503 km and whose gravitational acceleration at the surface is 0.464 m/s2? (b) How far from the surface will a particle go if it leaves the asteroid's surface with a radial speed of 523

*asked on July 14, 2020* -
## science

A small hockey puck slides without friction over the icy hill and lands 6.20 m from the foot of the cliff with no air resistance.What is its initial speed v0 at the bottom of the hill?

*asked on September 27, 2012* -
## Physics

A 62kg cyclist changes the speed of a 12kg bicycle from 8.2m/s to 12.7m/s. Determine the work done. Not sure how to start ! Do I calculate the difference or what and which formula

*asked on June 11, 2020* -
## Calculus

A company manufactures x units of one item and y units of another. The total cost in dollars, C, of producing these two items is approximated by the function C=7x^2+xy+1y^2+600. A) If the production quota for the total number of items (both types combined)

*asked on October 18, 2015* -
## Please help CHEM

What is the Kc for the following equilibrium at 500∘C, N2(g)+3H2(g)⇌2NH3(g) [H2] = 0.50M , [N2] = 0.50M , [NH3] = 2.0M ?

*asked on July 28, 2013* -
## physics

An electron experiences an electric force of 0.70 nN . What’s the field strength at its location?

*asked on March 3, 2018* -
## physics

he index of refraction of crown glass is 1.53 for violet light, and it is 1.51 for red light. (a) What is the speed of violet light in crown glass? (b) What is the speed of red light in crown glass?

*asked on May 14, 2013* -
## physics

A white-crowned sparrow flying horizontally with a speed of 1.65 m/s folds its wings and begins to drop in free fall. (a) How far does the sparrow fall after traveling a horizontal distance of 0.550 m? (b) If the sparrow's initial speed is increased, does

*asked on April 18, 2012* -
## calculus2

Use cylindrical shells to find the volume V of the solid. A right circular cone with height 9h and base radius 5r. The answer is 75πhr^2 but my answer is 39πhr^2. How???

*asked on June 25, 2018* -
## Life Span Development

1. Levels of social cognitive __________ do not always match __________. A. reasoning / behavior B. attributions / behavior C. behavior / biases D. attributions / reasoning

*asked on January 6, 2017* -
## calculus2

A manufacturer of corrugated metal roofing wants to produce panels that are u = 48 in. wide and 2 in. thick by processing flat sheets of metal as shown in the figure. The profile of the roofing takes the shape of a sine wave with equation y = sin(πx/12).

*asked on July 21, 2018* -
## calculus2

Evaluate the integral. ∫[0,1](12/4x^2+5x+1)dx

*asked on July 8, 2018* -
## Trig/pre-calc

r=8cos(theta)+5sin(theta), convert the polar equation into a rectangular equation and then complete the square and determine the center radius...? Help?! I missed the section, and am not getting anywhere with the text...

*asked on August 12, 2011* -
## chemistry

Ka for hypochlorous acid, HClO, is 3.0*10^(-8). Calculate the pH after 10.0, 20.0, 30.0, and 40.0 mL of 0.100M NaOH have been added to 40.00mL of 0.100M HClO.

*asked on March 10, 2011* -
## college physics

If the amplitude of a sound wave is tripled, A.) by what factor will the intensity increase? B.) by how many dB will the sound level increase?

*asked on May 6, 2010* -
## Trigonometry

State the quadrant in which theta lies. sin(theta) > 0 and cos(theta) > 0 How can I determine this? Please explain.

*asked on June 4, 2017* -
## Physics

Similarities between distance and displacement similarities between speed and velocity

*asked on February 18, 2014* -
## math

A hot water heater measures 20" in diameter. What is the area of a metal base for the water heater, assuming a four-inch overhang for the base beyond the edge of the heater? (Round to the nearest tenth.)

*asked on May 28, 2013* -
## AlgebraII

A bag contains 5 pictures of Paris and 7 pictures of London. Determine whether the events of selecting the picture of London and another picture of London with replacement is independent or dependent. Then identify the indicated probability.

*asked on April 9, 2012* -
## Math

A features that displays only the data in column (s) according to specified criteria *

*asked on August 31, 2019* -
## Engineering

6. classical mechanics depends heavily on A. quantum leaps B. ancient theories C. general observations * D. mathematical solutions 7. a virus is a parasite because A. it hunts its prey * B. it only impacts plants C. it lives of other organisms D. it is the

*asked on January 17, 2019* -
## calculus2

A tank is full of water. Find the work required to pump the water out of the spout. (Use 9.8 m/s^2 for g. Use 1000 kg/m^3 as the density of water. Assume r = 9 m and h = 3 m.) The tank is a spherical shape with r as the radius(9m). On top of the tank is a

*asked on June 28, 2018* -
## math

a man gets an invoice for $460 with terms 2/10, 1/15, n28 ow much would he pay 25 after the invoice date? help a little confused?

*asked on April 22, 2015* -
## chem TITRATION

1. If a student fails to remove a large air bubble in the buret before beginning the titration, what will be the effect on the volume of titrant required to reach the titration endpoint? A. The student will record a volume that is SMALLER than it should be

*asked on May 25, 2018* -
## Calculus

The total stopping distance T of a vehicle is shown below, where T is in feet and x is the speed in miles per hour. T = 2.5x + 0.5x^2 Approximate the change and percent change in total stopping distance as speed changes from x = 15 to x = 18 miles per

*asked on March 3, 2018* -
## English

Which one is correct? did you go to the class yesterday? OR did you went to the class yesterday?

*asked on October 14, 2016* -
## Physics

An arrow is shot from a height of 1.4 m toward a cliff of height H. It is shot with a velocity of 28 m/s at an angle of 60° above the horizontal. It lands on the top edge of the cliff 3.6 s later. a) What is the height of the cliff (in m)? I got 25.191 m

*asked on September 23, 2016* -
## Philosophy

The Omega watch company withdrew its ads from Vogue magazine in protest over what it called distasteful pictures of an emaciated model in the June 1996 issue. The brand director of Omega argued as follows: “Since Vogue presumably targets an audience that

*asked on November 21, 2015* -
## statistics

supposed that two balanced dice are rolled. let Y denote the product of the two numbers. use random variable notation to represent the event that the product of the two numbers is greater than 4 a {5,6} b {XY>4} c{Y>4} d P(Y>4)

*asked on October 7, 2015* -
## Math

Write a ratio for the situation in three ways, comparing the first quantity to the second quantity. A zoo has 19 monkeys and 10 chimpanzees. 19 to 10, 19:10, (This) 10 to 29, 10:29, 19 to 29, 19:29, 10 to 19, 10:19, Write three ratios equal to 5/40. 2/14,

*asked on January 10, 2013* -
## ms.sue

who is ms.sue? i've seen her a lot on the answers and she's EVERYWHERE!! is there only 1 ms.sue?

*asked on December 15, 2016* -
## History

What impact did imperial Spain have on the Americas? Spanish culture came to dominate and replace native cultures. Local leaders were replaced by Spanish parliamentary assemblies. Financing from Spain started the industrialization of the Americas.

*asked on August 3, 2018* -
## Chem

A dilute aqueous solution of Na2SO4 is electrolyzed between Pt electrodes for 3.70 h with a current of 2.77 A . Part A What volume of gas, saturated with water vapor at 25∘C and at a total pressure of 742 mmHg , would be collected at the anode? The vapor

*asked on March 31, 2018* -
## Probability

A defective coin minting machine produces coins whose probability of Heads is a random variable Q with PDF fQ(q)={3q2,0,if q∈[0,1],otherwise. A coin produced by this machine is tossed repeatedly, with successive tosses assumed to be independent. Let A be

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

1. Which of the following is TRUE regarding this situation: Solution A has a pH of 7.38, and Solution B has a pH of 7.42? a.Solution B is more acidic than Solution A b.The pH of Solution A falls within the homeostatic pH range for extracellular body

*asked on January 28, 2013* -
## stats

A company that manufactures and bottles apple juice has a machine that automatically fills 16-ounce bottles. There is some variation, however, in the exact amount of juice dispensed into each bottle. From a large number of observations taken over a long

*asked on January 29, 2011* -
## math

Can hours of daylight data be modeled as a sinusoidal function for every location on earth? Explain

*asked on February 24, 2020* -
## math

Upon amassing a fortune as a rock star, your uncle Zephaniah gives you $1 000 000. You decide to invest the whole lot into Canada Savings bonds (CSB's). The CSB's pay simple interest at a rate of 3.78% per year, and mature after fifteen years (that is, you

*asked on July 21, 2019* -
## math

ou are a pirate captain trying to determine how long it will take you to get to an island where you expect to find buried treasure. You are heading due North, toward the island. 60° West of North, you spot a light house. According to your sea chart, the

*asked on March 24, 2019* -
## Physics

The binding energy of a nucleus is the amount of energy needed to A.Remove a proton from the nucleus. B.Remove a neutron from the nucleus. C.Disassemble the nucleus. D.Fragment the nucleus. E.Fuse or join two of the nuclei together. Please help!

*asked on March 29, 2018* -
## Physics

On a cold winter day, the outside temperature is –5.0 °C while the interior of a well-insulated garage is maintained at 20.0 °C by an electric heater. Assume the walls have a total area of 75 m2, a thickness of 0.15 m, and a thermal conductivity of

*asked on March 18, 2018* -
## la

The speaker in "Birches" compares the boy's climbing to a. girls dying there hair b. sweeping up broken glass c. a forest full of spiderwebs d. filling a cup to the top I think D

*asked on September 17, 2017* -
## Math

In an examination of a certain class, at least 70% of the students failed in Physics, at least 72% failed in Chemistry, at least 80% failed in Mathematics and at least 85% failed in English. How many at lest must have failed in all the four subjects ?

*asked on May 26, 2017* -
## math percent

Find the percent of markup. Round to the nearest tenth $31.00 to $35.00

*asked on December 18, 2015* -
## probability

The lifetime of a type-A bulb is exponentially distributed with parameter λ. The lifetime of a type-B bulb is exponentially distributed with parameter μ, where μ>λ>0. You have a box full of lightbulbs of the same type, and you would like to know

*asked on April 3, 2014* -
## calculus

find the equation of the tangent line at the given value of x on the curve 2xy-2x+y=-14, x=2

*asked on August 3, 2010* -
## Math

At Canada's Wonderland, a thrill seeker can ride the Xtreme Skyflyer. This is essentially a large pendulum of which the rider is the bob. The height of the rider is given for various times: Time(s) 0 1 2 3 4 5 6 7 8 9 Height(m) 55 53 46 36 25 14 7 5 8 15

*asked on October 21, 2019* -
## finance

A lottery offers two options for the prize. Option A: $1000 a week for life. Option B: $600 000 in one lump sum. The current expected rate of return for large investment is 3%/a, compounded monthly. a. At what point in time is Option A better than Option

*asked on September 2, 2019* -
## math

A lottery offers two options for the prize. Option A: $1000 a week for life. Option B: $600 000 in one lump sum The current expected rate of return for large investment is 3%/a, compounded monthly. a.Which option would the winner choose if s/he expects to

*asked on August 29, 2019* -
## math

State the period, amplitude, max/min values, range, domain, horizontal phase shift and vertical displacement. y = -3cos (2x - 30°) + 1

*asked on April 15, 2019* -
## Math

Write the equation in vertex form: y= -3x^2+12x+15

*asked on February 25, 2019* -
## Language Arts *Last One I Promise*

1. If you were writing a brief profile of Rosa Parks explaining why you admire her, which of the following sentences would make the best thesis statement? In 1955, Rosa Parks refused to give up her seat on a bus. Rosa Parks's refusal to give up her seat

*asked on May 25, 2018* -
## Language Arts

n Edgar Allan Poe's "The Cask of Amontillado," the literary device of foreshadowing is used to create mystery when Montressor tells Fortunato a. "You are a man to be missed." b. "A draught of this Medoc will defend us from the damps." c. "You were not to

*asked on May 25, 2018* -
## Science

A fungus called stem rust penetrates the cells of a wheat plant, causing water loss, destruction of food-producing parts, and retarded root developemtn. Both the yield and quality of the grain are reduced. This relationship of stem rust to wheat would best

*asked on April 13, 2017* -
## J

the decimal expansion of 147/120 will be terminate after how many decimal

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

the amount of jens month phone bill is normally distributed with a mean of $69 and a standard deviation of $10. what is 68.26% of phone bill between?

*asked on December 3, 2015* -
## chemistry

Hydrogen gas produced by this reaction is typically collected via water displacement, during which time the hydrogen gas becomes saturated with water vapor. If 238.4 mL of gas with a total pressure 1.27 atm was collected via water displacement at 29.4 °C,

*asked on September 27, 2014* -
## physics

A diamond's index of refraction for red light, 656 nm, is 2.410, while that for blue light, 434 nm, is 2.450. Suppose white light is incident on the diamond at 32.2°. Find the angles of refraction for red and blue light. red light? blue light?

*asked on May 14, 2013* -
## Science

Classification of fibres

*asked on July 1, 2011* -
## Physics

Make an analogy between heat capacity and density. Describe which quantities correspond to one another. Thanks!

*asked on March 3, 2011* -
## Math

What other phenomena can be modeled using sinusoidal functions?

*asked on February 19, 2020* -
## science

Is a lily a composite flower?

*asked on February 7, 2020* -
## Math

n 2001, Windsor, Ontario will receive its maximum amount of sunlight, 15.28 hrs, on June 21, and its least amount of sunlight, 9.08 hrs, on December 21. a. Determine an equation that can model the hours of daylight function for Windsor, Ontario. b. On what

*asked on October 23, 2019* -
## math

The third-tallest Ferris Wheel in the world is the London Eye in England. The height (in metres) of a rider on the London Eye after t minutes can be described by the function h(t) = 67sin [12(t + 0.0223)] + 70. At what time(s) will the rider be at the

*asked on September 16, 2019* -
## math , probability

Let X and Y be two independent and identically distributed random variables that take only positive integer values. Their PMF is px (n) = py (n) = 2^-n for every n e N, where N is the set of positive integers. 1. Fix at E N. Find the probability P

*asked on August 29, 2019* -
## Finance

Vanna has just financed the purchase of a home for $200 000. She agreed to repay the loan by making equal monthly blended payments of $3000 each at 4%/a, compounded monthly. a. How long will it take to repay the loan? b. How much will be the final payment?

*asked on August 15, 2019* -
## triggggg

How does the graph of y = –3cos (2θ + 45°) + 3 differ from the graph of y = cos (θ)

*asked on April 22, 2019* -
## trig

Describe how the graphs of y + 3 = 2sin (3x + 90°) compares to the graph of y = sin (x).

*asked on April 16, 2019* -
## math

The graph of y = –3sin (2x) is shifted to the left by 30° units and up 5 units. Write the new equation. My answer y= -3sin (2x- 30°) +5 Is this correct?

*asked on April 15, 2019* -
## math

Canadian soldiers are practicing maneuvers in the Arctic, and all soldiers are starting at the same location. Platoon 1 is ordered to maintain their present location, Platoon 2 is ordered to march due north 1000 m, and Platoon 3 is ordered to march 800 m

*asked on March 24, 2019* -
## calculus2

Evaluate the integral using the indicated trigonometric substitution. (Use C for the constant of integration.) ∫√((x^2-4)/x)dx x=2sec(t)

*asked on July 6, 2018* -
## chem

Why does temp of water used for transferring and washing the precipitate matter? 1. to maximize evaporation 2. to minimize evaporation 3. to maximize the amount of product that dissolves in water

*asked on June 5, 2018* -
## physics

an 85.0kg mountaineer remains in equilibrium while climbing a vertical cliff. the tension force in the supporting rope is 745 N. Find the magnitude of the reaction force F, which the cliff exerts on the mountaineer's feet.

*asked on October 3, 2017* -
## Trigonometry

Point P is located at the intersection of the unit circle and the terminal side of angle theta in standard position. Find the coordinates of P to the nearest thousandth. theta = -105degrees Please explain the steps. I'm completely stuck.

*asked on June 1, 2017* -
## Physics

A bungee jumper runs off a platform and falls 40m before his bungee cord begins to stretch. Once the bungee cord begins to stretch his velocity slows by 20 m/s in 12m. If the mass of the bungee jumper is 55kg, what is the average force the bungee applies

*asked on December 6, 2016* -
## Pre-cal

Solve (in radians) sec x = 2csc x When I work it out, it gets to 2cot x - 1 = 0 cot x = 1/2 Would it be ok to use tan^-1 (2) ? I must demonstrate it with a graph as well... would the line go through Q I/III or II/IV ? Thank you!

*asked on November 15, 2016* -
## Math

Yin's cellphone plan costs $30 a month. She used 12.5 hours in May. What was her cost per minute? About how many call can she make? Yin's average call lasted 3.25 minutes. How much did an average call cost?

*asked on January 29, 2016* -
## Calculus

Set up a double integral for calculating the flux of the vector field F⃗ (r⃗ )=r⃗ , where r⃗ =⟨x,y,z⟩, through the part of the upward oriented surface z=9(x^2+y^2) that lies above the disk x^2+y^2≤25.

*asked on December 6, 2015* -
## Physics

At the moment when a shotputter releases a 7.26 kg shot, the shot is 2.0m above the ground and travelling at 15.0 m/s. It reaches a maximum height of 8.0m above the ground and then falls to the ground. Assume that air resistance is negligible. What is the

*asked on November 19, 2015* -
## Chem pls!!!!!

1) name one specific instance in which single displacement reactions can be useful. 2) zn + cucl --> cu + zncl2 in this reaction, a solid would be formed from the copper. what is the solid known as a ___________ please help me

*asked on April 2, 2015* -
## college physics

When a thin 12.0cm iron rod moves with a constant velocity of 6.50m/s perpendicular to the rod, the induced emf across its ends is measured to be 0.300V. What is the magnitude of the magnetic field?

*asked on March 13, 2015* -
## physics

A swimmer can swim in still water at a speed of 9.47 m/s. He intends to swim directly across a river that has a downstream current of 4.24 m/s. a) How many degrees from straight across the river should he head? Let upstream be a positive angle. Answer in

*asked on October 21, 2014* -
## chem

Three of the primary components of air are carbon dioxide, nitrogen, and oxygen. In a sample containing a mixture of only these gases at exactly one atmosphere pressure, the partial pressures of carbon dioxide and ni- trogen are given as PCO2 = 0.285 torr

*asked on May 30, 2014* -
## Probability

For each of the following sequences, determine the value to which it converges in probability. (a) Let X1,X2,… be independent continuous random variables, each uniformly distributed between −1 and 1. Let Ui=X1+X2+⋯+Xii,i=1,2,…. What value does the

*asked on April 23, 2014* -
## Probability

Alice has two coins. The probability of Heads for the first coin is 1/3, and the probability of Heads for the second is 2/3. Other than this difference, the coins are indistinguishable. Alice chooses one of the coins at random and sends it to Bob. The

*asked on April 2, 2014* -
## Physics Classical Mechanics

A uniform steel beam of mass m1= 300.0 kg is held up by a steel cable that is connected to the beam a distance L= 5.0 m from the wall, at an angle θ= 40.0∘ as shown in the sketch. The beam is bolted to the wall with an unknown force F⃗ exerted by the

*asked on November 26, 2013* -
## 8th grade science

How does altitude affect the freezing, melting and boiling points of water?

*asked on September 29, 2013*