Tuesday

November 25, 2014

November 25, 2014

Total # Posts: 74,627

**Orgo Lab**

Recrystallization is often used at the end of a synthesis. Choose the most accurate answer/s to explain the purpose of recrystallization and how it is done effectively? Note there may be more than one correct answer. 1.Dissolve the crude product in the minimum amount of cold ...
*October 19, 2014*

**science**

What is the visual reaction when CuSO4 and NaCO3 is combined? I know what to do, I just forgot the info at school and I need this done by tomorrow. I would prefer to figure it out on my own but I don't have the chemicals at my house and I can't find anything online to ...
*October 19, 2014*

**psychology**

Ms sue I tried.. I will try again then post
*October 19, 2014*

**statistics**

what is the percentage of the area under the curve is above the mean of the normal curve
*October 19, 2014*

**physics**

a soldier climbs a cliff with a pull of 750N on the rope and th rope is 22 degrees to the cliff . how much is he pulling.'
*October 19, 2014*

**physical chem**

calculate work when 1mol of H2O is heated from 0-100 degrees C at fixed pressure of 1atm.
*October 19, 2014*

**Algebra**

Angel service club is selling flowers. Cost if flower is .50. Sales price is cost of flower plus 40%. How many flowers do they need to sell to make profit of $500
*October 18, 2014*

**physics**

What is the velocity of the fallen ball that has 5kg
*October 18, 2014*

**calculus**

use differentials to determine by approximately how many centimeters does the diagonal of a square table increase if its area is increased from 50 square centimeters to 54.45 square centimeters? Area= s^2 Diagonal= sqrt(2s^2) so, D= sqrt(2A) dD=A^(-1/2) dA dD= 50^(-1/2)* 4.45 ...
*October 18, 2014*

**Music**

Is Sonata by Domenico Cimarosa in binary form?
*October 18, 2014*

**math**

it is a 3 digit number all the digits are different the first and second digits are multiple of 3 the first digit is greater than the second digit. the sum of the first two digits is 7 more that the third digit the number is not a multiple of 5 the third digit is greater than 3
*October 18, 2014*

**Physics **

Sanjay's air boat starts from rest and accelerates at 8.7 m/s2 for a distance of 176 meters. How fast is it moving at the end of the 176 meters?
*October 18, 2014*

**Calculus**

If G(x)=(x)/(1+2x), find G'(a) and use it to find an equation of the tangent line to the curve y=(x)/(1+2x) at the point (-1/4,-1/2). My answer: G'(a)=1/(1+2x)^2 Equation of tangent line: y= 4x+0.5
*October 18, 2014*

**Calculus**

A pebble is dropped from an open window 100 meters above the ground. a) What is the velocity of the pebble after 2 seconds? b) What is the velocity of the pebble when it hits the ground?
*October 18, 2014*

**Calculus**

Find the slope of the curve f(x)=1/(x^2+3). My answer: (-2x)/(x^2+3)^2
*October 18, 2014*

**Calculus**

The number of bacteria after t hours in a controlled laboratory experiment is n=f(t). Suppose there is an unlimited amount of space and nutrients for the bacteria. Which do you think is larger, f'(5) or f'(10)? If the supply of nutrients is limited,would that affect ...
*October 18, 2014*

**Computer Science**

class Employee{ public static void main(String[]args) { float hours; String lastName, firstName; char letter; float rate; boolean Y; boolean N; System.out.println("What is your first name?"); firstName = In.getString(); System.out.println("What is your family&#...
*October 18, 2014*

**Calculus**

The cost of producing x ounces of gold from a new gold mine is C=f(x) dollars. Do you think the values of f'(x) will increase or decrease in the short term? What about the long term? Explain.
*October 18, 2014*

**Art**

I am.
*October 18, 2014*

**Algebra**

(1990,52),(1992,55),(1994,59), (1996,63),(1998,66) With out calculating find a 2-year period that had a greater rate of chsnge than 1990-1992 explain your reasoning
*October 18, 2014*

**Algebra**

find the complex zeros of the polynomial. Write f in factored form: F(x)= 2x^2-5x^3-20x^2+115x-52=0
*October 18, 2014*

**Algebra Help**

Form a Polynomial f(x) Degree: 4, Zeros: 2+2i;-5, Multiplicity:2 f(x)=a(______________)
*October 18, 2014*

**Spanish please?**

to warn people of harm to protect men late at night to drive off evil spirits to care for people's children Discuss different things you can do in Punta del Este, Uruguay. Describe how the Pan American Games were established. 23. Give two reasons why the work of Marí...
*October 18, 2014*

**Spanish Questions?**

16. What makes Pan American Games different from the Olympic Games? some sports are unique, like jai alai they are celebrated every 2 years only Cuba can host them they are celebrated every 6 years 17. Which theory was developed based on observations made on the Galá...
*October 17, 2014*

**algebra 1**

4=18-3w 18 - 3w=4 +18 +18 -3w=22 7 1/3
*October 17, 2014*

**biology**

Part A. Making Visual Connections with the Textbook (5 points) You can answer these in a Word document, indicating the question number followed by your answer. Below is the Absorption Spectrum of Photosynthesis. As your textbook explains, plants have a number of light-...
*October 17, 2014*

**Calculus**

The number of bacteria after t hours in a controlled laboratory experiment is n=f(t). Suppose there is an unlimited amount of space and nutrients for the bacteria. Which do you think is larger, f'(5) or f'(10)? If the supply of nutrients is limited,would that affect ...
*October 17, 2014*

**Calculus**

The cost of producing x ounces of gold from a new gold mine is C=f(x) dollars. Do you think the values of f'(x) will increase or decrease in the short term? What about the long term? Explain.
*October 17, 2014*

**Calculus**

1. If the tangent line to y=f(x) at (4,3) passed through the point (0,2), find f(4) and f'(4). My answer: f(4)=3 f'(4)=1/4
*October 17, 2014*

**computer literacy**

A computer worm is most likely to attack
*October 17, 2014*

**chemistry**

Table salt, NaCl(s), and sugar, C12H22O11(s), are accidentally mixed. A 4.00-g sample is burned, and 3.30 g of CO2(g) is produced. What was the mass percentage of the table salt in the mixture?
*October 17, 2014*

**Language arts **

Which of the following exoresses a main idea from "Always to Remember"? A. Maya Ying Lin was a talented and smart college student who became a designer. B. Maya Ying Lin's family life, travel ecperiences, and education provided er a background necessary for a ...
*October 17, 2014*

**MATH HELP PLEASE**

Which statment is false? A. The number zero is a rational number. B. Some irrational numbers are also rational numbers. C. Every irrational number is a real number D. Every integer is a rational number Is the answer C?
*October 17, 2014*

**Language arts**

Which best describes Maya Ying Lin's design in "Always to remember" A. Place of healing, vertical like other monuments, durably made of stone. B. Harmonious with surrondings, place of healing, quiet memorial. C. Place of healing, political statement, quiet ...
*October 17, 2014*

**physics**

can u help me pleaseeeeee @Damon
*October 17, 2014*

**MATH HELP PLEASE**

Gee ok I get it please dont yell. Damon was sayigng what is the square root of 21 so I got confused
*October 17, 2014*

**MATH HELP PLEASE**

square root 21=4.582575695, so is the answer C? Because I do not understand what you are saying. C is the answer?
*October 17, 2014*

**MATH HELP PLEASE**

So the answer is 100000% D?
*October 17, 2014*

**MATH HELP PLEASE**

Which of these numbers can be classified as both real and irrational? a. 5.85 b. 63.4 c. square root 21 d. square root 36 Is the answer D?
*October 17, 2014*

**Precalculus**

(sinx-cosx+1)/(sinx+cosx-1)=(sinx+1)/(cosx)
*October 17, 2014*

**math**

Which of these numbers can be classified as both real and irrational? a. 5.85 b. 63.4 c. square root 21 d. square root 36 Is the answer D?
*October 17, 2014*

**MATH HELP PLEASE**

So The answer is D?
*October 17, 2014*

**Algebra**

-2+_2
*October 17, 2014*

**SS**

Is agriculture widespread in coniferous forest regions?
*October 17, 2014*

**Pre-Calc/Trig...**

thanks!!
*October 17, 2014*

**Pre-Calc/Trig...**

Helpp needed, this is sort of confusing me. Describe the nature of the roots for this equation. 2x^2-x+1=0 A. Two real, rational roots B. Two real, irrational roots C. One real, double root D. Two complex roots
*October 17, 2014*

**Pre-Calc/Trig...**

oh okay thank you!
*October 17, 2014*

**Pre-Calc/Trig...**

for number 2 the choices are: a. 25i b. 8i√5 c. -8i√5 d. -25i
*October 17, 2014*

**Pre-Calc/Trig...**

wait i just need help with number 2, i got number 1 which is 6i
*October 17, 2014*

**Pre-Calc/Trig...**

Help me please. Simplify 1. √-36 2. -√-625
*October 17, 2014*

**Physics/ Biomechanics**

Compare the vertical jump heights obtained using the vertical velocity at take off and half the flight time. Which one do you think is more accurate in assessing a vertical jump performance? - my vertical jump height using vertical velocity at take off = 0.28m - my vertical ...
*October 17, 2014*

**mathematics**

Fill up the missing values LENGTH=60cm BREADTH =45cm HEIGHT=? Volume=54 dm³
*October 17, 2014*

**psy 103**

Dubois claims that after the civil war, the courts and police forces led to the following outcomes
*October 17, 2014*

**SS**

Where is the Tree Stratum Zone of deciduous forests?
*October 17, 2014*

**SS**

Is the Okanagan in BC a valley?
*October 17, 2014*

**Calculus **

A tray of lasagna comes out of the oven at 200°F and is placed on a table where the surrounding room temperature is 70°F. The temperature T (in °F) of the lasagna is given by the function T(t)=e^94.86753-t)+70 , 0 ≤ t, where t is time (in hours) after taking ...
*October 17, 2014*

**Thermodynamics**

all wrong
*October 17, 2014*

**Thermodynamics**

jj
*October 17, 2014*

**Thermodynamics**

ooo
*October 17, 2014*

**algebra 1**

4=18-3w 18 - 3w=4 +18 +18 -3w=22 7 1/3
*October 17, 2014*

**math**

how many different combinations can you make using pennies, nickels, dimes, quarters, and the half dollar that equal 60 cents?
*October 16, 2014*

**Please Help!!!**

I can't figure it out
*October 16, 2014*

**Science**

Two football players collide head-on in midair while chasing a pass. The first player has a 100 kg mass and an initial velocity of 4.00 m/s in the positive x direction, while the second player has a 130 kg mass and initial velocity of 3.30 m/s in the negative x direction. What...
*October 16, 2014*

**calculus**

Find the point on the plane z = 6x + 9y + 1 closest to the point P = (1, 0, 0). Hint: Minimize the square of the distance. (x, y, z) =
*October 16, 2014*

**calculus**

find the coordinates of the centroid bounded by y=25x^2 and y=4. the region is covered by a thin flat plate
*October 16, 2014*

**physics**

a 1.00x10^3 kg car traveling at 22.5 m/s on level ground undergoes a perfectly inelastic collision with a spring loaded barrier (k= 8.00x10^3 N/m) weighing 1250kg. How much does the spring compress when they come to a stop? can someone help me set this up?
*October 16, 2014*

**English**

He wrote it Pros They could be free of Britain's quarrels with its European neighbors. · ·They would be free of obeying any laws set out by the British, especially the Intolerable Acts. · They could create their own democracy Cons · Some ...
*October 16, 2014*

**science help**

Yes, it's A.
*October 16, 2014*

**physics**

A torque of 12 N ∙ m is applied to a solid, uniform disk of radius If the disk accelerates at what is the mass of the disk?
*October 16, 2014*

**Algebra**

what is the area of a rectangle with a length that is 5 more than triple the width?
*October 16, 2014*

**math**

Equivalent of five thousandths
*October 16, 2014*

**Ions and octet rule**

Element Z3+ contains 31 protons. What is the identity, and how many electrons does Z3+ have.
*October 16, 2014*

**college physics**

two billiard balls of equal mass undergo a perfectly elastic collision. if the speed of one ball was initially 5.72 m/s and the other 1.64 m/s. what will their speeds be after the collision
*October 16, 2014*

**physics**

a net force of 72 n is applied to a 48 kg box starting from rest for 8 s. what is the final velocity of the box? I need someone to show me how to set up. thanks
*October 16, 2014*

**physics**

A 65 kg skateboarder is standing on a stationary .5 kg skateboard. the skateboarder steps off the a skateboard with a horizontal veolicty of 1.5 m/s. what is the recoil velocity of the skateboard ignoring friction?
*October 16, 2014*

**Science-Physics**

A fireworks rocket explodes at height h, the peak of its vertical trajectory. It throws out burning fragments in all directions, but all at the same speed v. Pellets of solidified metal fall to the ground without air resistance. Find the smallest angle that the final velocity ...
*October 16, 2014*

**algebra**

A car be rented for $55 per week plus .25 per mile. How many miles can driven if you have at most $280 to spend for weekly transportation?
*October 16, 2014*

**math **

jills fish weighs 8 times as much as her parakeet. together the pets weigh 63 ounces. how much does the fish weigh
*October 16, 2014*

**physics**

When a jet lands on an aircraft carrier, a hook on the tail of the plane grabs a wire that quickly brings the plane to a halt before it overshoots the deck. In a typical landing, a jet touching down at 240 km/h is stopped in a distance of 95 m. What is the magnitude of the jet...
*October 16, 2014*

**Math**

What is the negative square root to 90 to the nearest integer? A. 3 B. -5 C. 7 D. -9 Is the answer D? Thanks
*October 16, 2014*

**Math**

Thank you
*October 16, 2014*

**Math**

What is the solution to the square root 8 to the nearest integer? A. 3 B. 5 C. 7 D. 9 Is the answer A? Thanks
*October 16, 2014*

**Algebra**

A stagecoach left Drygulch traveling east at 3 km per hour. Two hours later, another stagecoach left Drygulch traveling in the same direction at 40km per hour, How many hours had the first one been traveling when the second one caught up?
*October 16, 2014*

**Algebra**

A train left mooseport traveling west at 50 mph. One hour later, another train left mooseport traveling east at 70 mph. How many hours had the first train been traveling when they were 350 miles apart.
*October 16, 2014*

**english 1 **

the concept of friends proves ironic in the poem
*October 16, 2014*

**Chemistry**

Oh so the decomposition HI is just Ea reverse? So it would be 139kJ?
*October 16, 2014*

**Chemistry**

1/2 H2(g) + 1/2 I2(g) -> HI(g) △H= +28kJ The activation energy for the formation of HI is 167kJ. The activation energy for the decomposition of HI is A. 28kJ B.139kJ C.167kJ D.195kJ I know it is an endothermic reaction.
*October 16, 2014*

**Algebra**

The length of a rectangle is 3 times the width. If the length is increased by 4 cm and the width is decreased by 1 cm,the parimeter would be 102 cm, find the dimensions of the original rectangle.
*October 16, 2014*

**Algebra**

An algebra book weighs 6oz less than twice as much as a grammar book. If 5 algebra books weigh the same as 8 grammar books, how much does an algebra book weigh.
*October 16, 2014*

**Pre-Calc/Trig...**

oh i see, how could i have forgotten!!
*October 16, 2014*

**Pre-Calc/Trig...**

Help me please. Solve the equation: (x-3)(x+2)=0 Enter the solution with the lowest value.
*October 16, 2014*

**math**

Of 320 consumers polled, some purchase Blu-ray movies, some only purchase movies on DVD, and some do both. If 300 people polled purchase Blu-ray discs and 280 purchase DVDs and Blu-ray discs, how many people only buy DVDs?
*October 16, 2014*

**Advanced math**

Find the original generating function in closed form for (1,2,3,4,5,...).
*October 16, 2014*

**Advanced math**

Show the number of partitions of n in which only odd parts may be repeated equals the number of partitions of n in which no part appears more than three times
*October 16, 2014*

**Science-Physics**

A car is moving at a constant 19.3m/s, and rain is falling at 8.9 m/s straight down. What angle does the rain make with respect to the horizontally observed by the driver?
*October 16, 2014*

**arithmetic**

what is the perimeter of a lions cage which is 12mlong and 5.5 wide
*October 16, 2014*

**maths**

320 students have food enough for 80 days. If after 20 days, 20 students leave. How many more days will the food last?
*October 16, 2014*

**Advanced math**

use integration to find the volume of a pyramid with heighs and square base witht of 6 unit and square base with sides of 4 units
*October 16, 2014*

**ca;culus**

Find the volume V of the region bounded by z = 240-60y, z = 0, y = 0, and y = 4 -x2
*October 16, 2014*

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