# ALan

Popular questions and responses by ALan-
## Chemistry

What is the colour of: 1. Cu+ 2. Cu2+ 3. Cu3+?

*asked on March 16, 2010* -
## math

The butcher shop sells a 3 lb package of chicken legs for $9.57. The supermarket sells chicken legs for $7.68/kg. Determine the price per kilogram that each store charges. Which store has the lower price per kilogram?

*asked on January 14, 2013* -
## math

From an observation tower that overlooks a runway, the angles of depression of point A, on one side of the runway, and point B, on the opposite side of the runway are 6 degrees and 13 degrees, respectively. The points and the tower are in the same vertical

*asked on August 21, 2011* -
## Language arts

1.Which of the following should be included in your research presentation? Select all that apply (2 answers) ***A.a broad topic **B.details and examples from a variety of sources C.a works cited list D.data from an atlas E.an outline 2.which of the

*asked on March 28, 2018* -
## Algebra II

A train left Podunk and traveled north at 75 Km/h. Two hours later, another train left Podunk and traveled in the same direction at 100 km/h. How many hours had the first train traveled when the second train overtook it?

*asked on October 29, 2007* -
## math

Fred has 15 cows John has twice as many cows as Fred had when Fred had as many cows as John has now how many cows has John?

*asked on September 21, 2014* -
## Physics

A small plane tows a glider at constant speed and altitude. If the plane does 2.00X10^5 J of work to tow the glider 165 m and the tension in the tow rope is 2660 N, what is the angle between the tow rope and the horizontal?

*asked on March 15, 2011* -
## Physics

A room has a volume of 120 m^3. An air-conditioning system is used to replace the air in the room every twenty minutes, using ducts that have a square cross ection. Assuming that air can be treated as an incompressible fluid, calculate the length of a side

*asked on March 16, 2010* -
## Math

1. Which function represents an initial population that increases 22% per year where A represents the initial value and X represents time in years? A. Y=A(0.22)^x B. Y=A(0.68)^x C. Y=A(1.22)^x D. Y=A(1.68)^x I do not get how to solve this problem. Any help

*asked on April 29, 2015* -
## algebra

Mary wants to hang a mirror in her room. The mirror and frame must have an area of 7 square feet. The mirror is 2 feet wide and 3 feet long. Which quadratic equation can be used to determine the thickness of the frame, x? (4 points)

*asked on February 7, 2015* -
## Econ

The New York Times cost $0.15 in 1970 and $0.75 in 2000. The average wage in manufacturing was $3.23 per hour in 1970 and $14.32 in 2000. a. By what percentage did the price of a newspaper rise? b. By what percentage did the wage rise? c. In each year, how

*asked on March 16, 2012* -
## physics

A 55-kg packing crate is pulled with constant speed across a rough floor with a rope that is at an angle of 44.7 degrees above the horizontal. If the tension in the rope is 155 N, how much work is done on the crate to move it 9.0 m? *looking for W=__J

*asked on March 15, 2011* -
## Chemistry

Which of the following statements must be True? Check all that apply. The number of Adenines in single-stranded DNA equals the number of Thymines. The number of Guanines in single-stranded DNA equals the number of Adenines. The number of Thymines in

*asked on November 21, 2013* -
## chemistry

An enzyme-catalyzed reaction is carried out in a 50-mL solution containing 0.1 M TRIS buffer. The pH of the reaction mixture at the start was 8.0. As a result of the reaction, 0.002 mol of H+ were produced. What is the ratio of TRIS base to TRIS acid at

*asked on February 4, 2008* -
## Math (check answers)

1) Given that p(-3), p(-1), and p(5)=0, which expression could be p(x)? A)x^3-x^2-17x-15 B)x^3+x^2-17x+15 C)x^3-3x^2-13x+15** D)x^3-9x^2+23x-15 2) Coaches in a football conference had the option to vote for or against a rule change. The table below shows

*asked on April 29, 2015* -
## Physics

Early one October, you go to a pumpkin patch to select your Halloween pumpkin. You lift the 2.8 kg pumpkin to a height of 1.4 m, then carry it 50.0 m (on level ground) to the check-out stand. Calculate the work you do on the pumpkin as you lift it from the

*asked on March 15, 2011* -
## Physics

A ball rolling with initial velocity of 40m/s(W) undergoes an acceleration of 5.0m/s^2(N) for a period of 6.0seconds. (A) what is the final velocity of the ball? (B) what is the displacement of the ball in the 6.0 sec

*asked on October 7, 2014* -
## Math

Find the x-intercept and the y-intercept of the linear equation 3x + 4y = 12. Write each intercept as an ordered pair.

*asked on November 18, 2013* -
## physics

what is the maximum torque on a rectangular coil 5 cm x 12 cm and with 600 turns when carrying a current of 0.0700A in a uniform field with magnitude 0.300T?

*asked on August 8, 2016* -
## geometry

A cone is created from a paper circle with a 90° sector cut from it. The paper along the remaining circumference of the circle is the base of the cone. Find the radius of the base of the cone. Round to the nearest hundredth.

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

A 3.00 uF and a 5.00 uF capacitor are connected in series cross a 30.0V battery. A 7.00 uF capacitor is then connected in parallel across the 3.00 uF capacitor. a)Calculate the equivalent capacitance of the circuit I think the answer is 3.33 uF.

*asked on February 16, 2010* -
## Math help Steve?

1) Given that p(-3), p(-1), and p(5)=0, which expression could be p(x)? A)x^3-x^2-17x-15 B)x^3+x^2-17x+15 C)x^3-3x^2-13x+15 D)x^3-9x^2+23x-15 Hi Steve, I got what you said, but how would I solve this equation then?

*asked on April 29, 2015* -
## business

18. Which of the following is not a ramification of too much or too little status in an organization? a. it inhibits communication b. solidarity is not developed c. it interferes with work d. it causes resentment and conflict e. it causes communication

*asked on November 28, 2010* -
## Math

1) Malene rented a compact car for 10 days and drove it 620 miles for a total cost of 412$. Patrick rented a compact car at the same rental car company for 6 days and drove it 850 miles. His total cost was 295. Which system of equations could be used to

*asked on April 29, 2015* -
## Physics

Three blocks are connected on the table as shown below. The coefficient of kinetic friction between the block of mass m2 and the table is 0.345. The objects have masses of m1 = 3.25 kg, m2 = 1.25 kg, and m3 = 2.50 kg, and the pulleys are frictionless. The

*asked on February 11, 2015* -
## Physics 30

An object located in front of a concave mirror with a radius of curvature of 80 cm produces an invert image that is three times the size of the object. Calculate the distance between the object and the mirror.

*asked on November 11, 2009* -
## College Algebra

Mendoza Manufacturing plans to producea one compartment vertical file by bending the long side of a 10-in. by 18-in. sheet of plastic along two lines to form a U-shape. How tall should the file be in order to maximize the volume that it can hold?

*asked on October 4, 2009* -
## chemistry

An enzyme-catalyzed reaction is carried out in a 50-mL solution containing 0.1 M TRIS buffer. The pH of the reaction mixture at the start was 8.0. As a result of the reaction, 0.002 mol of H+ were produced. What is the ratio of TRIS base to TRIS acid at

*asked on February 2, 2008* -
## geometry

Rewrite the statement in if-then form. All equilateral triangles have three congruent sides. a. a figure has three congruent sides if and only if it is an equilateral triangle. b. a figure is an equilateral triangle if and only if it has three congruent

*asked on October 2, 2007* -
## Chemistry

What is the Net Ionic Equation for Nitric Acid and Potassium Carbonate?

*asked on October 12, 2016* -
## Math

Evaluate the expression for the given value. x = 3; y = -5; z = -2 x(yz)^2 - 3(xyz)^0 + 2x^2yz^2 = 3(-5 * -2)^2 - 3(3 * -5 * -2)^0 + 2(3)^2(-5 * -2)^2 = 3 * 100 - 3 * 30 + 2 * 9 300 - 90 + 18 = 228

*asked on November 25, 2013* -
## Math

Perform the indicated operation. Write your answer as a simplified fraction. 1. 1/3 + 0.25 = 7/12 2. 0.3125 - 1/4 = 1/16 3. -7/10 + 0.2 = -9/10

*asked on November 13, 2013* -
## Math

You and your friend ordered a 12 inch pizza to split for lunch. How many square inches of pizza do you each get to eat? Round answer to 2 decimal places. 37.68 square inches

*asked on November 13, 2013* -
## calculus

find the rms value of the function i=15(1-e^-1/2t) from t=0 to t=4

*asked on November 20, 2011* -
## physics

A 70 kg person sits on a 3.6 kg chair. Each leg of the chair makes contact with the floor in a circle that is 1.5 cm in diameter. Find the pressure exerted on the floor by each leg of the chair, assuming the weight is evenly distributed.

*asked on May 12, 2011* -
## Geometry

What is the sum of the measures of the interior angles of a convex octagon? What is the sum of the measures of the interior angles of a convex decagon? What is the measure of one interior angle of a regular polygon with 20 sides? Thank You! (:

*asked on February 3, 2010* -
## Term paper Research

i don't know if you remember me. But I am the one that is doing the term paper over hydroponics. I have found a couple of really good sites thanks to one of the homework helpers. but i really need magazine articles about hydroponics. I have found a couple

*asked on April 5, 2009* -
## Geometry

Which best describes the relationship between the lines with equations -16x+2y=0 and -x-8y=-2? a. neither parallel nor perpendicular b. parallel c. same line d. perpendicular

*asked on October 26, 2007* -
## geometry

Name the property which justifies the following conclusion: given: 3q+9r conclusion: 3(q+3r)

*asked on October 3, 2007* -
## chemistry

Determine the molarity of 30% (w/w) KOH of specific gravity 1.29. Thanks for any help.

*asked on September 10, 2007* -
## Conics

What type of conic is represented by the polar equation? r= 1 / 4-6cos theta Ellipse Hyperbola Parabola Circle Help! Homework help needed

*asked on April 26, 2018* -
## chemistry

A 8.408 gram sample of an organic compound containing C, H and O is analyzed by combustion analysis and 12.53 grams of CO2 and 3.849 grams of H2O are produced. In a separate experiment, the molar mass is found to be 118.1 g/mol. Determine the empirical

*asked on February 19, 2017* -
## Chemistry

7. A student conducts an experiment on a different hydrate. The empty crucible is heated to a constant mass of 24.330. A sample of the unidentified hydrate is placed in the crucible, and the total mass is 31.571 g. The crucible and hydrate are heated to

*asked on September 28, 2016* -
## History

What were the major changes in sciences view of the nature of the universe and humanity's place in it between 1850 and 1914? How did these developments contribute to the age of anxiety? How are these changes reflected in philosophy, psychoanalysis, and

*asked on December 18, 2014* -
## Organic Chemistry

What ketone or aldehyde would be reduced to produce each alcohol, respectively: a. 3,3-Dimethyl butan-2-ol b. 3-Methyl butan-1-ol c. Benzyl alcohol

*asked on May 24, 2014* -
## Chemistry

Consider the heterogeneous equilibrium process shown below. C(s) + CO2(g) 2 CO(g) At 700.°C, the total pressure of the system is found to be 3.87 atm. If the equilibrium constant KP is 1.52, calculate the equilibrium partial pressures of CO2 and CO.

*asked on February 23, 2013* -
## Pre-Calculus

A jet leaves an airport on a bearing of N 77* W and travels for 243 mi. It then turns and continues on a bearing of S 13* W for 104 mi. Find how far the jet is from the airport to 3 decimal places.

*asked on December 30, 2012* -
## Calculus

If 27 J of work are needed to stretch a spring from 18 cm to 24 cm and 45 J are needed to stretch it from 24 cm to 30 cm, what is the natural length of the spring?

*asked on December 4, 2011* -
## Math

From an observation tower that overlooks a runway, the angles of depression of point A, on one side of the runway, and point B, on the opposite side of the runway are, and , respectively. The points and the tower are in the same vertical plane and the

*asked on August 21, 2011* -
## physics

A 1.1 kg block is held against a spring of force constant 2.0×10^4 N/m, compressing it a distance of 0.20 m. How fast is the block moving after it is released and the spring pushes it away? v=____m/s

*asked on March 15, 2011* -
## Physics

Two waves are combined to form this standing wave equation of y(x,t) = (3 mm)sin[x/(2 m]cos[(100 rad/s)t] a. What's the amplitude of the right moving wave and left moving wave? b. What's the wavelength of the right moving wave and left moving wave? c.

*asked on February 11, 2011* -
## Chemistry

In the reaction: Protection of 1-Phenylethanol by 3,4-Dihydro-2H-pyran, 1-phenylethanol, 3,4-Dihydro-2H-pyran and anhydrous ether were added first and stirred in ice-water bath before acid catalyst p-toluenesulfonic acid monohydrate was added. The reaction

*asked on September 4, 2010* -
## math

I calculated the average number of crashes over a 240 week period to be .0875... what formula do I use to calculate the probability that at least 19 crashes would occur over that 240 week period?

*asked on March 16, 2010* -
## Physics, help please!

A hypothetical spherical planet consists entirely of iron (p=7860 kg/m^3). Calclate the period of a satellite that orbits just above its surface. I started out with the pressure formula P=M/V, but i kept subbing in other formulas, but i get stuck..can

*asked on March 2, 2010* -
## Phyics

A resistor has a resistance R, and a battery has an internal resistance r. When the resistor is connected across the battery, ten percent less power is dissipated in R than would be dissipated if the battery had no internal resistance. Show that the ratio

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

A cathode ray tube operates at 80 kV with a current of 875 uA. Calculate the a)Intesity (# of photons per second f the x-rays b)Minimum wavelength of the x-rays produced by the CRT thanks in advance

*asked on December 7, 2009* -
## Global History

Identify Jacobins

*asked on September 28, 2009* -
## Algebra Need answers ASAP

What is the factored form for a Quadratic Function with it vertex at the origin?

*asked on March 28, 2008* -
## GEOMETRY AGAIN

THIS IS ANOTHER QUESTION I HAVE BEEN STUCK ON FOREVER. I THINK IT REQUIRES TOO MUCH THINKING. PHILLIP WALKED 100 YARDS TO THE EAST WHILE SHONDRA WALKED 155 YARDS TO THE SOUTHEAST. MEANWHILE, 200 YARDS TO THE NORTH, JOSE WALKED 155 YARDS TO THE WEST AND

*asked on November 20, 2007* -
## geometry

Wrtite the slope intercept form of the equation of the line passing through point (5,1) and parallel to the line y=-4x-2.

*asked on October 30, 2007* -
## geometry

Which is the slope of a line perpendicular to the line 4x-2y=5?

*asked on October 26, 2007* -
## geometry

Decide which one of the following statements is false. a. any three points lie on a distinct line. b. three noncollinear points determine a plane. c. a line contains at least two points. d. through any two distinct points there exists exactly one line. my

*asked on October 2, 2007* -
## Algebra

A pollster conducts a survey by phone. The probability that a call does not result in a person taking this survey is 85%. What is the probability that the pollster makes 4 calls and none result in a person taking the survey?

*asked on April 2, 2020* -
## Algebra

Of 20 test scores, seven are less than or equal to 81. What is the percentile rank of a test score of 81?

*asked on April 2, 2020* -
## World History

The British naval blockade of the North Sea Contributed to?

*asked on April 4, 2019* -
## Trig

For parametric equations x=a cos t And y=b sin t Describe how the values of a and b determine which comic section will be traced.

*asked on May 16, 2018* -
## science

How are white and yellow produced by the opponent process?

*asked on February 3, 2018* -
## algebra

Here are yesterday's high temperatures (in Fahrenheit) in 13 U.S. cities. 50 , 56 , 56 , 58 , 60 , 61 , 63 , 66 , 67 , 71 , 71 , 80 , 83 Notice that the temperatures are ordered from least to greatest. Give the five-number summary and the interquartile

*asked on December 11, 2017* -
## Precalculus

Suppose H(X)=(6x-5)^3 Find two functions f and g such that (f•g)(x)=H(x) Neither function can be the parent/ identity function

*asked on September 27, 2017* -
## Physics, Calculus

if an aircraft flying at 250km/h at bearing N 45East for 1 hour meets a wind from the NW at 50km/h, then how long will it take to fly the full 550km maintaining its N45E bearing to the ground with this wind blowing?

*asked on June 25, 2017* -
## Math

There are 36 books on a bookcase.there are 9 nonfiction,12 fiction,and 15 science fiction. What is the probability of choosing a nonfiction book of choosing a fiction book of choosing a science fiction book?

*asked on May 20, 2017* -
## Math

2 2/4 divide by 1 1/4

*asked on April 18, 2017* -
## Chemistry

What is the concentration in each of the following solutions? A) 240 mL of 0.200 M KNO3 is added to 160 mL of water. B) 2.25g of NaCl is dissolved in 250 ml of water.

*asked on October 12, 2016* -
## Chemistry

The quantity of Cl- in a water supply is determined by titrating the sample with Ag+. What mass of chloride ion is present in a 10,0g sample of the water if 20.2 ml of 0.100 M Ag+ is required to react with all the chloride in the sample?

*asked on October 12, 2016* -
## maths

Gunpowder contains 75%nitre and10% sulphur.find the amount of gunpowder which carries 9 kg nitre . what amount of gunpowder would contain 2.5kg sulphur

*asked on September 26, 2016* -
## Maths

-3x+2y=-6

*asked on August 22, 2016* -
## Chemistry

5 grams of H2 reacts with 16 g of O2, which in excess? 2H2(g)+O2(g)=2H2O(g)

*asked on May 21, 2016* -
## math

If the store purchases an item at a wholesale cost of $3.50 per item, and it is sold at a retail value of $5.00 per item. What is the gross profit percentage of the item?

*asked on April 20, 2016* -
## Geometry

A wheel 2ft wide rolls a distance of .015 miles in .005 hours. What is the wheels speed in rpm's?

*asked on March 31, 2016* -
## Geometry

The diagonals of rectangle ABCD intersect at point E. If AE=2x+5, and BD=5x+2, what is AC?

*asked on February 24, 2016* -
## Chemistry

Nicotine is a basic substance and its dissociation constant is about 1.0 x 10-6. To prepare a solution water with 0.01 mol L-1, calculate the PH

*asked on January 22, 2016* -
## Chemistry

An amount of 25ml of a 0.8 Molar solution of pure KNO3 and placed in a volumetric flask. Is added water until the thin volume reaches exactly 500ml. which the final concentration?

*asked on January 21, 2016* -
## Chemistry

An aluminum sheet used for food preservation weighs about 0.05 g/cm-2 How many electrons are in a 1 cm2 of this sheet?

*asked on January 21, 2016* -
## Math

Hello again! I would appreciate help very much on this. Thank you! 1) For which values of x is y equal to 16 in the equation y=|3x+4|? A) -60 and 36 B) -36 and 60 C) -20/3 and 4 D) 20/3 and 4

*asked on April 29, 2015* -
## Math

1)If the roots of a quadratic equation are -2 and 3, the equation can be written as A) (x+2)(x+3) B) (x-2)(x+3)** C) (x+2)(x-2) D) (x-2)(x-3) Is the answer B? If someone could help me that would be great.

*asked on April 29, 2015* -
## Physics

A constant retarding torque of 12 N*m stops a rolling 0.80 m diameter wheel in a distance of 15 m. How much work does the torque do?

*asked on April 4, 2015* -
## AP Calc

The US Post Office has a limit on the size of packages it will accept for mailing. The length plus the girth must be 84 inches or less. Find the dimensions of the rectangular package with a square end, which will maximize the volume of the package.

*asked on December 1, 2014* -
## MATH

Mimi's Market sold 24 heads of lettuce one morning. That afternoon 2/7 of the remaining heads of lettuce were sold. The number of heads left was now 1/2 of the number the market had at the beginning of the day. How many heads of lettuce were there at the

*asked on November 17, 2014* -
## math/set theory

120 quilts were entered into a quilt show. (Traditionally, all quilts were hand stitched but now many are stitched on machines. Appliques are additional pieces of cloth that are sewn on top of the quilt.) In this show, 86 were machine stitched. 44 had

*asked on November 13, 2014* -
## Social Studies

What are some lifestyles for the following countries: -Kazakhstan -Kyrgyzstan -Latvia -Liechtenstein

*asked on October 9, 2014* -
## Physics

A ball rolling with initial velocity of 40m/s(W) undergoes an acceleration of 5.0m/s^2(N) for a period of 6.0seconds. (A) what is the final velocity of the ball? (B) what is the displacement of the ball in the 6.0 sec

*asked on October 7, 2014* -
## Maths

Mathew is attending a very loud concert by the discarded. To avoid permanent ear damage he decides to move farther from the stage. Sound intensity is given by the formula I=k/d*d where k is the constant and d is the distance in metres from the listener to

*asked on October 1, 2014* -
## ch

A 0.160-g sample of unknown metal (X) reacts with hydrochloric acid to produce 66.5 mL? Help please

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

Evaluate the expression for the given value. x = -2; y = 3; z = -1 -2x^2y - 3xy^2z - xz =

*asked on November 24, 2013* -
## Chemistry

In a double-stranded DNA molecule, the percentage of Guanine can never be more than ___%. Why?

*asked on November 22, 2013* -
## Math

Solve the following: -6x + 3

*asked on November 19, 2013* -
## Math

Solve the following. 2(x + 1) - 4

*asked on November 19, 2013* -
## Math

Evaluate when x = 2, y = -5, z = 3. x^2 - y = 3 3z - 4(y + 1) - y^2 = 0 x - yz = -13

*asked on November 19, 2013* -
## Math

Simplify or solve as appropriate. Enter ns if there's no solution or all if the solution is all real numbers. 2 - 3(x + 5)) = 10 X = -7.6 7z + 6 - 2(z + 3) 5 * z 1/2x - 5 = 3/4x + 7 X = -48

*asked on November 19, 2013* -
## Math

Using the linear equation y = -3x + 5, complete the table of values (T-Chart) and choose the correct graph. X = -2 Y = _ X = -1 Y = _ X = 0 Y = _ X = 1 Y = _ X = 2 Y = _

*asked on November 19, 2013*