# A

Most popular questions and responses by A-
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## Probability

Let Θ be a Bernoulli random variable that indicates which one of two hypotheses is true, and let P(Θ=1)=p. Under the hypothesis Θ=0, the random variable X is uniformly distributed over the interval [0,1]. Under the alternative hypothesis Θ=1, the PDF

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

The random variable X is uniformly distributed over the interval [θ,2θ]. The parameter θ is unknown and is modeled as the value of a continuous random variable Θ, uniformly distributed between zero and one. Given an observation x of X, find the

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

We have k coins. The probability of Heads is the same for each coin and is the realized value q of a random variable Q that is uniformly distributed on [0,1]. We assume that conditioned on Q=q, all coin tosses are independent. Let Ti be the number of

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

The vertical coordinate (“height") of an object in free fall is described by an equation of the form x(t)=θ0+θ1t+θ2t2, where θ0, θ1, and θ2 are some parameters and t stands for time. At certain times t1,…,tn, we make noisy observations Y1,…,Yn,

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

Consider a Poisson process with rate λ. Let N be the number of arrivals in (0,t] and M be the number of arrivals in (0,t+s], where t>0,s≥0. In each part below, your answers will be algebraic expressions in terms of λ,t,s,m and/or n. Enter 'lambda' for

*asked on May 1, 2014* -
## Probability

Let X=U+W with E[U]=m, var(U)=v, E[W]=0, and var(W)=h. Assume that U and W are independent. The LLMS estimator of U based on X is of the form U^=a+bX. Find a and b. Express your answers in terms of m, v, and h using standard notation. a=- unanswered b=-

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

Let N be a geometric r.v. with mean 1/p; let A1,A2,… be a sequence of i.i.d. random variables, all independent of N, with mean 1 and variance 1; let B1,B2,… be another sequence of i.i.d. random variable, all independent of N and of A1,A2,…, also with

*asked on April 3, 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* -
## 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 percent

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

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

Similarities between distance and displacement similarities between speed and velocity

*asked on February 18, 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* -
## 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* -
## SS

The political movement that brought Africans together in the 1950s was known as ________. a. imperialism b. salt trade c. colonialism d. Pan-Africanism Enslaved Africans from West Africa traveled across the Atlantic Ocean to European Colonies in the

*asked on September 29, 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* -
## Statistics

Problem 6 A histogram shows the number of hours students spent preparing for a test. The table below gives the intervals and the heights of the bars (in percent per hour). Intervals contain the left endpoint but not the right. No student spent 25 hours or

*asked on February 25, 2013* -
## 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* -
## physics

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

*asked on March 3, 2018* -
## 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

A computer is normally $550 but is discounted to$385 what percent of the original price dose mark pay A. 16.5 B. 30% C. 65% D. 70%

*asked on September 18, 2019* -
## 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* -
## Probability

For any given flight, an airline tries to sell as many tickets as possible. Suppose that on average, 10% of ticket holders fail to show up, all independent of one another. Knowing this, an airline will sell more tickets than there are seats available

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

Let U, V, and W be independent standard normal random variables (that is, independent normal random variables, each with mean 0 and variance 1), and let X=3U+4V and Y=U+W. Give a numerical answer for each part below. You may want to refer to the standard

*asked on April 20, 2014* -
## 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* -
## Probability

We are given the following statistics about the number of children in the families of a small village. There are 100 families: 10 families have no children, 40 families have 1 child each, 30 families have 2 children each, 10 families have 3 each, and 10

*asked on May 1, 2014* -
## LA

. Which of the following quotes from "The Morning of June 28, 1948" Best describes the aversion that the public felt toward Shirley Jackson's short story "The Lottery?" A) “As a matter of fact, when I read it over later I decided that except for one two

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

Let T1,T2,…,Tn be i.i.d. observations, each drawn from a common normal distribution with mean zero. With probability 1/2 this normal distribution has variance 1, and with probability 1/2 it has variance 4. Based on the observed values t1,t2,…,tn, we

*asked on April 2, 2014* -
## 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

Identify the incorrectly punctuated sentence The child wore a pink cotton shirt. We had a tiring, hot day outdoors. She cooked a delicious healthy meal.**** (I think it's missing a comma) The game was a suspenseful, exciting experience.

*asked on May 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* -
## 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* -
## chemistry

Imagine there is a tank of unknown gas that contains 53.31% carbon, 35.51% oxygen, and 11.18% hydrogen by mass. At 35.0 °C and 0.470 bar, 2.0 L of the gas has a mass of 3.3 g. Using this information, answer the following questions. a.) What is the

*asked on September 27, 2014* -
## 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* -
## 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* -
## Social Studies

Compare and contrast the treatment of different religions by rulers of the Arab empire.

*asked on January 24, 2019* -
## math

A parking lot space is in the shape of a rectangle. If the space has a length of 23 feet and a width of 12 feet, what is the area of the parking space?

*asked on February 14, 2018* -
## 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* -
## Math

What is the simplified version of this expression 28st/-4t the / meaning its a fraction

*asked on September 21, 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* -
## 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* -
## 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* -
## 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* -
## Calculus

For the vector field G⃗ =(yexy+3cos(3x+y))i⃗ +(xexy+cos(3x+y))j⃗ , find the line integral of G⃗ along the curve C from the origin along the x-axis to the point (3,0) and then counterclockwise around the circumference of the circle x2+y2=9 to the

*asked on November 20, 2015* -
## la

chose the meaning that best matches the word in italics. many actors avoid playing superheroes because they fear the ********stereotype******** that comes with success in the role. a label b popularity c persona d restrictions

*asked on December 22, 2015* -
## 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* -
## Managerial Economics

Economists consider which of the following costs to be irrelevant to a short run business decision? A)out of pocket B)historical cost C)opportunity cost D)replacement cost

*asked on November 12, 2007* -
## 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* -
## chemistry

A 8.50-g sample of solid AlCl3·6H2O was heated such that the water turned to steam and was driven off. Assuming ideal behavior, what volume would that steam occupy at 1.00 atm and 100.0 °C?

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

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

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

Pedro is thinking about buying U.S. savings bonds. However, there is a financial institution controlled by the government that may actively discourage Pedro from buying bonds. How and why would such a financial institution do this? A. Stocks on Wall Street

*asked on May 19, 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* -
## Civics

In every stage of these oppressions we have petitioned for redress in the most humble terms: our repeated petitions have been answered only by repeated injury. Which of the following statements best explains this quote from the Declaration of Independence?

*asked on January 10, 2013* -
## chemistry

Air is 78.1% nitrogen, 20.9% oxygen, and 0.934% argon by moles. What is the density of air at 22 °C and 760 torr? Assume ideal behavior.

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

In parts 1, 3, 4, and 5 below, your answers will be algebraic expressions. Enter 'lambda' for λ and 'mu' for μ. Follow standard notation. Shuttles bound for Boston depart from New York every hour on the hour (e.g., at exactly one o'clock, two o'clock,

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

Let Θ be an unknown random variable that we wish to estimate. It has a prior distribution with mean 1 and variance 2. Let W be a noise term, another unknown random variable with mean 3 and variance 5. Assume that Θ and W are independent. We have two

*asked on April 20, 2014* -
## 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* -
## 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* -
## calculus

A small aircraft, on a heading of 225 degrees, is cruising at 150 km/h. It is encountering a wind blowing from a bearing of 315 degrees at 35 km/h. Determine the aircraft's ground velocity.

*asked on May 2, 2010* -
## biology

what is the difference (or is there a difference) between species that go extinct naturally, and species that go extinct because of human activity?

*asked on July 16, 2019* -
## Language Arts

*First off sorry there are so many, I just wanted to check because it's always better safe than sorry* Identify the correctly punctuated sentence in each group. A.) Do you know where Bailey shoes are? B.) Do you know where Bailey's shoes are?* C.) Do you

*asked on May 25, 2018* -
## Algebra2

how do you solve this? A dice is rolled twice. What is the probability of getting a multiple of 3 on the first roll or a total of 7?

*asked on April 10, 2012* -
## Social Studies

How did the end of world war 2 impact Minnesota's economy? How did the GI Bill help encourage economic growth in Minnesota and the rest pf the naiton? How are the growth of highways and suburbs related?

*asked on April 30, 2018* -
## physics

The drawing below shows a person who, starting from rest at the top of a cliff, swings down at the end of a rope, releases it, and falls into the water below. There are two paths by which the person can enter the water. Suppose he enters the water at a

*asked on February 22, 2013* -
## 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* -
## math

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 14, 2019* -
## SOCIAL STUDIES

Business and Investing Quiz 1. suppose that people in your community voted to eliminate all local taxes. Which of these goods and services would most likely disappear. A. interstate highway maintenance B. neighborhood trash pickup C. regional military base

*asked on May 8, 2019* -
## 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* -
## Math

$100 is deposited at the beginning of every week for five years in an account that pays 14%/a, compounded weekly. a. What type of annuity is this? b. Find the future value of the annuity using the formula.

*asked on July 30, 2019* -
## math

An object is launched at 19.6 m/s from a 58.8 m tall platform. The equation for the object's height above the ground (y) at time tseconds is y = –4.9t2 + 19.6t + 58.8 Use the quadratic formula to find the roots of this equation. What do these numbers

*asked on March 6, 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* -
## Physics

A man stands on the roof of a building of height 14.4 m and throws a rock with a velocity of magnitude 28.7 m/s at an angle of 29.9 ∘ above the horizontal. You can ignore air resistance. a) the maximum height above the roof reached by the rock b)

*asked on September 26, 2019* -
## Chemistry

In a gaseous system at equilibrium with its surroundings, as molecules of A(g) collide with molecules of B(g) without reacting, the total energy of the gaseious system 1. decreases 2. increases 3. remains the same

*asked on April 13, 2009* -
## Physics

A girl delivering newspapers travels 1 blocks west, 2 blocks north, then 4 blocks east. What is the magnitude of her resultant dis- placement? Answer in units of blocks. 002 (part 2 of 3) 10.0 points Find the direction (measured from due east, with

*asked on November 19, 2017* -
## math

How much will $8500 be worth if it is invested for 10 years at 6.5%/a, compounded weekly?

*asked on July 23, 2019* -
## 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* -
## Civics

In what way do mixed and market economies support the ideals of democracy? A. Mixed and market economies elect a few farmers and local leaders to choose which goods and services to produce. B. Mixed and market economies do not produce more goods or

*asked on May 19, 2016* -
## Algebra

1. In the formula S=a1(1−r), what restrictions are placed on the variable r? 2. The formula A=12bh can also be expressed as A=bh2. Do you agree? 3. If x and y are real numbers, and xy=0, then either x=0 or y=0. Do you agree? 4. Do the inequalities xlogx?

*asked on September 22, 2019* -
## English

Do these words evoke emotions? If so how? “real reason”, “distrust”, “refusal”, “racial minority youth”, “woo young voters”, “faulty premises.”

*asked on June 21, 2019* -
## Business Math - help needed

Federal Express bought material handling equipment for its hub operations that cost $180,000. Using the MACRS, what is the depreciation expense in year 3 (using a five-year class)? A. $43,560 B. $34,560 C. $15,360 D. $40,000 Answer: B??

*asked on April 10, 2016* -
## Managerial Economics

Diseconomies of scale can be caused by: A)bureaucratic inefficiencies B)increasing advertising and promotional costs. C)the law of diminishing returns D)all of the above

*asked on November 12, 2007* -
## 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* -
## 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* -
## behavior health

According to classical test theory, if the observed variance of a test is 50 and the true variance is 40, what is the estimated reliability of the test? a. 0.40 b. 0.50 c. 0.80 d. 0.90 I selected C for my answer 40/50 is the .80 If the correlation between

*asked on January 22, 2017* -
## 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* -
## 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* -
## Probability

All ships travel at the same speed through a wide canal. Each ship takes t days to traverse the length of the canal. Eastbound ships (i.e., ships traveling east) arrive as a Poisson process with an arrival rate of λE ships per day. Westbound ships (i.e.,

*asked on April 30, 2014* -
## Chemistry

For ethanol, C2H5OH, which is mixed with gasoline to make the fuel gasohol, H°f = -277.63 kJ/mol. Based upon data in Table 6.2, and that the density of ethanol is 0.787 g•cm-3, the number of kilojoules released by burning completely 2.40 gallons of

*asked on October 16, 2011* -
## Geometry Ratios

At the half time show during a football game, a marching band is to form a rectangle 50yards by 16yards. The conductor wants to plan out the band members positions using a 14- by 8.5-in. sheet of paper. What scale should she use to fir both dimensions of

*asked on March 13, 2012* -
## Probability

A single dot is placed on a very long length of yarn at the textile mill. The yarn is then cut into pieces. The lengths of the different pieces are independent, and the length of each piece is distributed according to the same PDF fX(x). Let R be the

*asked on May 1, 2014*