Thursday

October 2, 2014

October 2, 2014

Total # Posts: 181

**algebra**

x2 = −x + 1
*September 14, 2014*

**algebra**

(z − 1)^2 + 4 = 0
*September 14, 2014*

**algebra**

A company has determined that the profit, in dollars, it can expect from the manufacture and sale of tennis racquets is given by P = −0.01x^2 + 130x − 180,000. How many racquets should the company manufacture and sell to earn a profit of $174,900? (Enter your ...
*September 14, 2014*

**algebra**

A model rocket is launched upward with an initial velocity of 200 feet per second. The height, in feet, of the rocket t seconds after the launch is given by h = −16t2 + 200t. How many seconds after the launch will the rocket be 380 feet above the ground? Round to the ...
*September 14, 2014*

**math**

solve v=1/3TTr2h; h
*September 11, 2014*

**math**

A motorboat left a harbor and traveled to an island at an average rate of 11 knots. The average speed on the return trip was 10 knots. If the total trip took 4.2 hours, how far is the harbor from the island
*September 11, 2014*

**math**

How many liters of water should be evaporated from 110 liters of a 12% saline solution so that the solution that remains is a 20% saline solution
*September 11, 2014*

**math**

Write an equation of a line in standard form with a slope of -8 and passing through the point (-10, 2).
*May 6, 2014*

**Calculus**

A rocket fired straight in the air is being tracked by a radar station 3 miles from the launching pad. If the rocket is travelling at 2 miles per second, how fast is the distance between the rocket and the tracking station changing at the moment when the rocket is 4 miles in ...
*April 9, 2014*

**education**

I beleive the answer is, B!
*March 25, 2014*

**education**

Teacher observations are vital to the promotion and maintenance of children's health status because: A. they provide a baseline of typical behavior and appearance of each child. B. teachers have primary responsibility for children's health care while they are attending...
*March 25, 2014*

**Physics**

Pi = Initial Pressure (Atmospheres) Pf = Final pressure (Atmospheres) V = Volume n = Moles R = That constant number Ti = Initial Temperature (Kelvins) Tf = Final Temperature (Kelvins) Use the Ideal Gas law. PiV=nRTi & PfV=nRTf ----In the problem, half the gas is removes, so ...
*November 30, 2013*

**Calculus**

Consider the function f(x) whose second derivative is f''(x)=5x+2sin(x). If f(0)=3 and f'(0)=3, what is f(3)?
*November 19, 2013*

**Calculus**

A Norman window has the shape of a rectangle surmounted by a semicircle. (Thus, the diameter of the semicircle is equal to the width of the rectangle.) If the perimeter of the window is 25 ft, find the dimensions of the window so that the greatest possible amount of light is ...
*November 18, 2013*

**Calculus**

Answer the following questions for the function f(x)=(x^3-9x^2+27x-27)/(x^2-6x+8) defined on the interval [-14, 22]. Enter points, such as inflection points in ascending order. A. The function f(x) has vertical asymptotes at _______ and ________. B. f(x) is concave down on the...
*November 5, 2013*

**Chemistry**

How many grams of phosgenite can be obtained from 14.0 g of PbO and 14.0 g of NaCl in the presence of excess water and carbon dioxide?
*November 4, 2013*

**Calculus**

Find the absolute maximum and absolute minimum values of the function f(x)=x^3+6x^2-63x+4 on each of the indicated variables. Enter DNE for does not exist. (A) Interval = [-8,0] Absolute maximum = Absolute minimum = (B) Interval = [-5,4] Absolute maximum = Absolute minimum = (...
*October 29, 2013*

**Calculus**

List the critical numbers of the following function in increasing order. Enter N in any blank that you don't need to use. f(x) = (6x+6)/(5x^2+5x+5)
*October 28, 2013*

**Chemistry**

An 80.0 g sample of a gas was heated from 25 degree C to 225 degree C. During this process, 346 J of work was done by the system and its internal energy increased by 7495 J. What is the specific heat of the gas? J/(g∗C)
*October 22, 2013*

**Chemistry**

In a constant-pressure calorimeter, 65.0 mL of 0.330 M Ba(OH)2 was added to 65.0 mL of 0.660 M HCl. The reaction caused the temperature of the solution to rise from 23.85 °C to 28.35 °C. If the solution has the same density and specific heat as water, what is ΔH ...
*October 22, 2013*

**Calculus**

Use continuity to evaluate. as x approaches 2, lim arctan((2x^2-8)/(3x^2-6x))
*October 22, 2013*

**Calculus**

y = tan^-1(sqrt(5x^2-1)) find dy/dx
*October 21, 2013*

**Calculus**

Suppose f(x) = 3x + 4. What is f^-1(x) and what is (f^-1)'(x).
*October 14, 2013*

**Calculus**

Find the derivative of the function y, below. It may be to your advantage to simplify before differentiating. y = 8x(ln(x)+ln(2))-4x+pi
*October 14, 2013*

**Calculus**

The radius of a circular disk is given as 24 cm with a maximal error in measurement of .2 cm. What is the percentage error?
*October 10, 2013*

**Calculus**

The linear approximation to (1/sqrt(9-x)) at x=0. What is y?
*October 10, 2013*

**Math**

Find the pattern 0.8, 0.4, 0.2, 0.1, ?
*October 2, 2013*

**Math**

-(5) to the 2nd power
*September 19, 2013*

**chemistry**

what is the density of an object with a mass of 125g and a volume of 176ml?
*September 17, 2013*

**chemistry**

what is the density of an object with a mass of 125g and a volume of 176ml?
*September 17, 2013*

**math**

the temperature is -10 degrees outside. The temperature inside is 72 degrees. what is the difference between the two temperatures?
*September 5, 2013*

**math**

(-0.9)(-0.64)
*September 5, 2013*

**math**

0.05 + -4.74
*September 5, 2013*

**Phyiscs**

A 40,000 kg jet has a force of 3.9×10^3 newtons. what is the acceleration of the jet
*April 3, 2013*

**Physics**

in a childrens soccer game, one of the children kicks the ball from the ground, giving it an itial velocity of 22m/s a) what height and range does the ball reach? b) How high is the ball 2.25s into flight?
*March 24, 2013*

**Physics**

in a childrens soccer game, one of the children kicks the ball from the ground, giving it an itial velocity of 22m/s a) what height and range does the ball reach? b) How high is the ball 2.25s into flight?
*March 24, 2013*

**Algebra**

What does / Equal in a formula? Such as 2A/3 =8+4A
*March 21, 2013*

**Physics**

same and yea he does this is nuts
*March 16, 2013*

**calculus**

If that is the case, Damon, wouldn't the answer just be 1?
*March 9, 2013*

**probability**

choose a number 1 to 100. What is the probability that the number is not a multiple of 5?
*March 8, 2013*

**Algebra**

In a Quadratic function if -b=-2 and 2a=2/3 do you eliminate the two and x equals negative three or... What would x end up being?
*February 25, 2013*

**6 grade Math**

Should it be 1 1/2
*January 23, 2013*

**6 grade Math**

How do I divide this ... 3 divided by 1/2
*January 23, 2013*

**spanish**

Preparamos because the subject, Sarits y yo, is plural and includes yo. This means that the nosotros conjugation of the verb is needed. Preparan is ellos or ustedes.
*January 4, 2013*

**Calculus**

Find the limit lim x->2 (2x^2 +1)/(x^2 + 6x -4)
*November 30, 2012*

**chemistry**

Use Avogadro's number 6.022 X 10^23.
*October 9, 2012*

**physics**

A 0.73 kg ball is thrown straight up with an initial velocity of 2.50 m/s. Taking the potential energy of gravity to be zero at the height from which the ball is thrown, determine its gravitational potential energy at the balls highest point. Ignore air resistance.
*October 5, 2012*

**physics**

You are planning to build a log cabin in northern Minnesota. You will pull the logs up a long, smooth hill to the building site by means of a rope attached to a winch. You need to buy a rope for this purpose, so you need to know how strong the rope must be. Stronger ropes cost...
*September 27, 2012*

**physics**

You are part of a team to help design the atrium of a new building. Your boss, the manager of the project, wants to suspend a 16.0 kg sculpture high over the room by hanging it from the ceiling using thin, clear fishing line (string) so that it will be difficult to see how the...
*September 27, 2012*

**phsycis**

A tight-rope walker walks across a 30.0 m long wire tied between two poles. The center of the wire is displaced vertically downward by 1.0 m when he is half-way across. If the tension in both halves of the wire at this point is 3675 N, what is the mass of the tight-rope walker...
*September 20, 2012*

**phsyics**

To move a large crate across a rough floor, you push on it with a force F at an angle of 21¨¬ below the horizontal. The mass of the crate is 31 kg, ¥ìs is 0.57, and ¥ìk is 0.45. Find the force necessary to start the crate moving
*September 19, 2012*

**Math**

If you had a new business and you had 30 customers the first week and 55 customers the second week and 80 customers the third week, what would you project for week 4? Explain how you arrived at your answer.
*September 14, 2012*

**physics**

The engine of a 1250 kg car provides a forward directed force of 3,560 N. If the car accelerates at a rate of 2.60 m/s2, what is the total resistive force (wind resistance, friction, etc.) acting on the car?
*September 13, 2012*

**Math**

What is a shortcut for finding the sum of all numbers from 1-99?
*September 11, 2012*

**physics**

The eye of a hurricane passes over Grand Bahama Island in a direction 60.0° north of west with a speed of 36.1 km/h. Three hours later, the course of the hurricane suddenly shifts due north, and its speed slows to 26.9 km/h. How far (in km) from Grand Bahama is the ...
*September 9, 2012*

**physics**

A gray kangaroo can bound across a flat stretch of ground with each jump carrying it 9.3 m from the takeoff point. If the kangaroo leaves the ground at a 17.6 degree angle, what is its takeoff speed?
*September 8, 2012*

**Physics**

You push your couch a distance of 3.6 m across the living room floor with a horizontal force of 198.0 N. The force of friction is 151.0 N. What is the work done by you, by the friction force, by gravity, and by the net force?
*May 27, 2012*

**Physics**

A car of mass m = 1450 kg is traveling at a speed of v0 = 79 km/h (21.9 m/s). Calculate the work that must be done by the brakes to completely stop the car in kJ
*May 27, 2012*

**Physics**

That's what I figured but I wasn't sure because it talks about the negative side of the x-axis. However, looking at the question again, a) is the only answer that makes sense. Thank you.
*May 23, 2012*

**Physics**

1. A particle moved from point A to point B on the x-axis and had a positive displacement. Which one of the following is true? a. particle moved in the positive direction but it is on the negative side of the x-axis b. particle moved in the negative direction but it is on the ...
*May 23, 2012*

**Physics**

1. A particle moved from point A to point B on the x-axis and had a positive displacement. Which one of the following is true? a. particle moved in the positive direction but it is on the negative side of the x-axis b. particle moved in the negative direction but it is on the ...
*May 23, 2012*

**Biomaterials**

What is the theoretical density of tantalum (Ta) with the following characteristics: Crystal structure: BCC Atomic radius: 14.6 Angstroms Atomic weight: 180.9 g/...
*May 22, 2012*

**physics**

An outfielder throws a baseball with an initial speed of 30 m/s at an angle of 13° to the horizontal. The ball leaves his hand from a height of 1.75 m. How long is the ball in the air before it hits the ground?
*May 21, 2012*

**Mathematical Reasoning**

Just the floor and thanks Steve
*April 4, 2012*

**Mathematical Reasoning**

the circumference is 29.5 inches
*April 4, 2012*

**Mathematical Reasoning**

How many Men size basketballs fit into a 25' by 25' room?
*April 4, 2012*

**physics**

This problem was done wrong. same equation but the answer was solved incorrectly. Your solving for v2. so 72 should be divided by the 208 not the other way around. The answer should be less the 1. around 0.346.
*March 27, 2012*

**Math**

Suppose you invest $8000 at a nominal interest rate of 5.75% for 5 years. Find the accumulated amount if your account is accumulated yearly.
*March 20, 2012*

**Living ENvironment**

HOW do you know if it is snthesis or hydrolosis
*February 16, 2012*

**Living ENvironment**

can you give me a picture lock and key diagrams. I need to make my own lock and key diagram. I dont know the difference between synthesis and hydrolosis so can you give me some pictures and label them if they are hydrolosis or synthesis.
*February 16, 2012*

**math**

How do I figure the degree of measure from 18-24 people = 11%
*February 15, 2012*

**Physical Chemistry**

A mole of air (80% Nitrogen, and 20% Oxygen by volume) at 298.15K is brought into contact with liquid water which has a vapor pressure of 3168Pa at this temperature. a) what is the volume of the dry air if the pressure is 1 bar? b) what is the final volume of the air saturated...
*February 6, 2012*

**chemistry**

How many grams of magnesium metal are produced by the decomposition of 19 grams of magnesium chloride?
*February 6, 2012*

**Math**

Show why the below equation is true using the areas of rectangles: 2p+5p=(2+5)p 3(4-1)=3x4-3x1
*January 30, 2012*

**Reading**

What's a description of Nicholas II and his Family that would go with the story Animal Farm?
*January 25, 2012*

**math (geometry)**

If p∨q is true, then what must be true about the truth values of p and q?
*January 15, 2012*

**Question**

Newport News is in VA dude
*December 20, 2011*

**calculus**

If a snowball melts so that its surface area decreases at a rate of 3 cm2/min, find the rate at which the diameter decreases when the diameter is 9 cm. (Give your answer correct to 4 decimal places.)
*November 29, 2011*

**calculus**

The force F (in Newtons) required to move a box of mass m kg in motion by pulling on an attached rope is F(x) = f m g/(cos(x))+ f (sin(x)) where x is the angle between the rope and the horizontal, f is the coefficient of static friction and g = 9.8 m/s^2. Find the angle x that...
*November 14, 2011*

**calc**

Use the Mean Value Theorem to show: -x < sinx < x for all x > 0 (and where I have the inequalities, it's supposed to be less than or equal to for the first two and greater than or equal to for the last one, I just didn't know how to type it)
*November 3, 2011*

**Intermediate Algebra**

Find the x- y-intercepts and graph the function f(x)=5x-10
*October 18, 2011*

**Chemistry **

Alkali metals are so reactive that they react directly with water in the absence of acid. For Example... 2 K(s) + 2 H2O(l) ¨ 2 K+(aq) + 2 OH− (aq) + H2(g). How many milliliters of hydrogen will be evolved over water when 4.52 g K reacts with an excess of. H2O (l)?
*October 12, 2011*

**U.S HISTORY**

What are two reasons the French felt threatened by British interest in the Ohio River Valley?
*September 28, 2011*

**Languge arts**

Who are the major characters in the book MAUS?
*April 11, 2011*

**MathHelp**

a to the 9 power b to the 3 power / a to the 7 power b to the 8 power.( a^8b^8/ a^7b^8)
*April 3, 2011*

**Trig**

A Person is riding a bike with wheels that have a 14 inch radius at 15 mph. The bicyclist rides over some gum which sticks in the tire, assume this is t=0. 1. Find a function that gives the height in inches above the ground of the gum, with input is second
*March 30, 2011*

**math**

thank you!
*March 7, 2011*

**4th grade math**

does it have anything to do with division FIND the Mean: 11, 18, 13, 14. help please!
*March 7, 2011*

**math**

Find the mean of 11, 18, 13, 14. how do i go about it?
*March 7, 2011*

**chemistry**

The molar mass is an indirect relection of the polarizablity. Because molecules with higher molar masses often have more protons and thus more electrons the molecule will be more suseptable to polarizablity. Polarizing a molecule is deforming its electron cloud. Some molecules...
*March 4, 2011*

**chemistry**

Use the equation PV=nRT (pressure times volume equals moles of gas times constant times temperature). Assuming you aren't with-holding information, the number of moles of gas and the temperature must remain the same, so the initial Pressure and Volume must be equal to the ...
*March 3, 2011*

**Math - Nash equilibrium**

Part 1 Consider a variant of electoral competition on the line that captures features of the US presidential election. Voters are divided between two states. State 1 has more electoral college votes than does state 2. The winner is the candidate who obtains the most electoral ...
*February 28, 2011*

**chemistry**

You could definately check the boiling points to see if they are pure but that would kind of defeat the purpose of steam distillation. What compounds are you working with? Could you do some other test?
*February 17, 2011*

**geometry**

a rectangular-shaped garden has a length of 40 feet and a width of 15.how many more square feet of garden could be obtained by increasing both the length and width by 10 feet
*February 14, 2011*

**physics**

A crow sits on a clothesline midway between two poles as shown. Each end of the rope makes an angle of θ = 16° below the horizontal where it connects to the pole. If the combined weight of the crow and the rope is 8.4 N, what is the tension in the rope?
*February 14, 2011*

**Chemistry**

An ideal gas with an initial volume of 2.30L is cooled to 12.00 Celsius where its final volume is 1.85L. What was the temperature initially?
*February 7, 2011*

**college physics**

A cube of ice is taken from the freezer at -9.5 degree Celsius and placed in a 99 g aluminum calorimeter filled with 327 g of water at room temperature of 20.0 degree celsius. The final situation is observed to be all water at 17.0 degree Celsius. What was the mass of the ice ...
*January 18, 2011*

**physics**

A rock is dropped. How fast will the 5.0 kg rock be traveling in 4.0s if a 5.o N force of air resistance acts on it?
*December 16, 2010*

**Algebra 1**

6x^2+6x
*December 13, 2010*