Tuesday

April 21, 2015

April 21, 2015

Total # Posts: 4,336

**science**

where does the energy needed to heat up cold water come from?
*May 19, 2013*

**math**

An aircraft is flying in a straight line away from a person standing on the ground. The initial angle of elevation changes from 70 degrees to 30 degrees in 1 minute. What is the cruising speed of the aircraft if its altitude is 10,000 m?
*May 17, 2013*

**math**

how do you find the rate of change from x=-1 to x=0 on a graph function?
*May 17, 2013*

**math**

write each decimal as a mixed number.5.25 and 9.12 WAS never taught this. Thank you
*May 15, 2013*

**math**

write each mixed number as a decimal.3 and seven tenths. 4 and one half how??
*May 15, 2013*

**math**

1. ((9*9+5)/9 = (81+5)/9 = 86/9 2. (6*39 + 23)/39 = (234 + 23)/39 = 257/39 3. 5 3/4 4. 19/4 * 8/7 = 34/7 5. 311/15 -52/3 = (311-260)/15 =51/15 =17/5 6. 0 7. P = 70
*May 14, 2013*

**Alegebra**

A + B = 30 0.6A + 0.3B = 0.4(30) A + B = 30 6A + 3B = 120 -3A -3B = -90 6A + 3B = 120 3A = 30 3A/3 = 30/3 A = 10 10 + B = 30 10-10 + B = 30-10 B = 20 Or A = x B = 3-x , 0.4(30) 0.6x + 0.3(30-x) = 0.4(30) 0.6x + 9 -0.3x = 12 0.3x + 9 = 12 0.3x + 9-9 = 12-9 0.3x = 3 0.3x/0.3 = 3...
*May 13, 2013*

**French**

Alex will go to the library to study and Becca will go play soccer at the park for there weekend
*May 13, 2013*

**French**

i need to write a french conversation about going to places such as the cinema, library and do activities. i started off but i need help so far: A-Bonoujour Becca B- Salut Alex comment ca va? A- Ca va bien, et toi B-ca va tres bien A-Qu'est-ce que tu vas faire cet
*May 13, 2013*

** math calculus**

The demand function for a product is given by p = 10,000 [1 − (5/5 + e^−0.001x)] where p is the price per unit (in dollars) and x is the number of units sold. Find the numbers of units sold for prices of p = $1000 and p = $1500. (Round your answers to the nearest ...
*May 10, 2013*

**history**

What lessons from the past pertaining to the civil rights and women's movement from the past can we apply to the future?
*May 9, 2013*

**math 160(buss calculus)**

my homework is due in 1 hour Let x = 1 and Δx = 0.01. Find Δy. (Round your answer to five decimal places.) f(x) = x/x^2 + 5
*May 4, 2013*

**math**

80
*May 3, 2013*

**math**

a piece of land in the shape of a reguler pentagon has a perimeter of 400m.calculate one side
*May 3, 2013*

**Chemistry **

If you had a 200 ML container full of helium gas, and you transferred all of the gas into an empty 1.00 ml container, would the 1.00 ml container be full or only 1/4 full?
*May 2, 2013*

**Chemistry **

If you had a 200 ML container full of helium gas, and you transferred all of the gas into an empty 1.00 ml container, would the 1.00 ml container be full or only 1/4 full?
*May 2, 2013*

**math**

rectangular prism has a volume of 240 ft3. write two possible sets of dimensions for the prism
*April 30, 2013*

**math**

Please help me solve this question. Find the value of the annuity. a=1000 I=0.06,n=25? what is the future value of annuity? (round to the nearest cent.)
*April 29, 2013*

**physics**

a wheel radius 0.25 m is mounted on a frictionless horizontal axle. the moment of inertia of the wheel about the axis is 0.040. a light cord wrapped around the wheel supports the 0.50 kg of box. the wheel is released from the rest. what is the magnitude of acceleration of the ...
*April 28, 2013*

**Chemistry**

Why does the titration of terephthalic acid yield a mass of approximately half the molar mass?
*April 27, 2013*

**math**

I need help solving this equation please. Use the qudratic formula to find any x-intercepton the graph of the equation. Y=3x^2+9-1
*April 24, 2013*

**Math**

Adam left the airport and traveled toward the Capital. Elisa left one hour later traveling 50 mph in an effort to catch up to Adam. After traveling for 4 hours Elisa finally caught up. What was Adam's average speed?
*April 23, 2013*

**English**

Take the subject you explored in Part 1 of Submission 2 and narrow it down so that it can be covered in one paragraph. You might use one of the two techniques below. 1. Use one incident from the Answers column of your chart to illustrate an idea. Example: Writing Idea: Fads ...
*April 23, 2013*

**math**

What fraction is equivalent to 14/22
*April 22, 2013*

**Algebra1**

1. A bicycle racer covers a 75 mile training route to prepare for an upcoming race. If the racer could increase his speed by 5 mph, he would complete the same course in 3/4 of the time. Find his average rate of speed. 2. Nina drove for 6 hours at an average rate of 50 mph. ...
*April 18, 2013*

**chemistry**

Calculate the compositionof the gaseous mixture obtained when 1.25 mol f carbon dioxide is exposed to hot carbon at 800 degree celcius in a 1.25 liter vessel. The equilbrim constant kc at 800 degree celcius is 14 for the reaction CO2 + C = 2C0
*April 18, 2013*

**math**

Can you check my answer to see if i really get this word problem thing A camper leaves the campsite walking due east at a rate of 3.5 mph. Another camper leaves the campsite at the same time but travels due west. In two hours the campers will be 15 miles apart. What is the ...
*April 18, 2013*

**Math**

thank you, i have trouble "translating" a word problem to an equation, but thanks!
*April 18, 2013*

**Math**

Two towns are 420 miles apart. A car leaves the first town traveling toward the second town at 55 mph. At the same time, a second car leaves the other town and heads toward the first town at 65 mph. How long will it take for the two cars to meet?
*April 18, 2013*

**Social studies**

How did texas change their government and the way they earned their living after reconstruction?
*April 16, 2013*

**Grade 12 Calculus **

Determine the maximum and minimum of each function on the given interval. a) = 2x^3 − 9x^2 ,−2 ≤ x ≤ 4 b) = 12x − x^3 , x∈ [−3,5]
*April 15, 2013*

**Science need help ?????///**

An astronomer observes two galaxies, A and B, which have redshifts of: Galaxy A = 0.020 and Galaxy B = 0.010. Which galaxy is closest to us and what is its distance away from us? You may assume that the Hubble constant is H0 = 75 km s–1 Mpc−1 and that the speed of ...
*April 14, 2013*

**english**

Is it more closely?
*April 12, 2013*

**english**

WRITE the adverb form that correctly completes the sentence. Hawks resemble falcons (close) of all birds.
*April 12, 2013*

**Physics**

A mirror produces an image that is located 50.0 cm behind the mirror, when the object is located 5.50 cm in front of the mirror. (a) What is the focal length of the mirror? (b) Is the mirror 1 - concave or 2 - convex? (Give the number of the correct answer.)
*April 11, 2013*

**Combinations and Permutations, Steve and Ms. Sue☺**

#8. the answer is 6,840 yourwelcome.
*April 10, 2013*

**math **

There are 27 students in Mrs. Reeds class. The number of boys and number of girls are both composite numbers. There are 3 more girls than boys. How many girls and how many boys are in the class?
*April 10, 2013*

**math**

11 and 13. Thank you. We didnt learn prime and composite numbers but still have homework on it.
*April 10, 2013*

**math**

There are 24 students in Mr.Hills class. The number of boys and number of girls are both prime numbers. There are 2 more boys then girls. How many boys and how many girls are in each class?
*April 10, 2013*

**Chemisrty**

What volume of oxygen, measured at STP, can be prepared by heating 2.16g HgO?
*April 10, 2013*

**math**

What are the intersection points of y = 1/x and y = 1/x^2? Is it x = 0 and x = 1? Thank You
*April 9, 2013*

**Math Systems**

I cannot solve these last three systems. Could you show me the work for them so i understand how to do them. 1) x-y=1 2x+y=5 3x-4y=2 2) 5x+8y+6z=14 2x+5y+z=12 -3x+6y-12z=20 3) x^2+2xy-2y^2=-11 x^2+xy-2y^2=-9
*April 6, 2013*

**Accounting**

How would the journal entry look if you sold a 8% bond with a face value of $11,000 for $9,500? Bond will mature in 10 years.
*April 5, 2013*

**Math**

What is next number in series: 100 96 104 88 120 56
*April 4, 2013*

**calculus **

Use a graph of f(x) = 3 e^{-8 x^2} to estimate the x-values of any critical points and inflection points of f(x). critical points x= Inflection points x= Next, use derivatives to find the x-values of any critical points and inflection points exactly. critical points x= ...
*April 3, 2013*

**advance functions gr12**

write an equation for a rational function whose graph has all of the indicated features: -vertical asymptote with equation x=3 -horizontal asymptote with equation y=2 -hole at x=1 no x intercept thank you
*April 2, 2013*

**calculus**

Consider a window the shape of which is a rectangle of height h surmounted by a triangle having a height T that is 1.1 times the width w of the rectangle If the cross-sectional area is A, determine the dimensions of the window which minimize the perimeter. h = w =
*April 1, 2013*

**Analytical Chemistry**

Current is applied to an aqueous solution of calcium sulfide. Multiple choice help please??! What is produced at the cathode? A) H2(g) B) S(s) C) O2(g) D) Ca(s) What is produced at the anode? A) O2(g) B) H2(g) C) Ca(s) D) S(s)
*March 30, 2013*

**Physics**

A molecule of DNA (deoxyribonucleic acid) is 2.01 µm long. The ends of the molecule become singly ionized: negative on one end, positive on the other. The helical molecule acts like a spring and compresses 0.75% upon becoming charged. Determine the effective spring ...
*March 30, 2013*

**Physics**

Direction is 45° however not getting correct magnitude to help sorry
*March 30, 2013*

**Science**

How is playing on a seasaw an example of the scientific definition of work
*March 27, 2013*

**Physics**

A stainless-steel orthodontic wire is applied to a tooth, as in the figure below. The wire has an unstretched length of 3.42 cm and a radius of 0.14 mm. If the wire is stretched 0.13 mm, find the magnitude and direction of the force on the tooth. Disregard the width of the ...
*March 26, 2013*

**math**

pat gave $24 to mary and linda in the ratio 1:3. how much money does linda get?
*March 26, 2013*

**math**

Thank you. Our teacher just gave us this problem and did not show us how to do the second part.
*March 25, 2013*

**math**

The Carsons are putting a rectangle swimming pool in their yard. It will measure 20ft by 12ft. They plan to have a cement walkway around the pool which should measure 4 ft wide. What is the area of the walkway?
*March 25, 2013*

**Physics**

A 3.6 kg ball strikes a wall with a velocity of 9.3 m/s. The ball bounces off with a velocity of 7.9 m/s in the opposite direction. If the ball is in contact with the wall for 0.4 seconds, what is the constant force exerted on the ball by the wall?
*March 25, 2013*

**fundamental of management**

young innovative or high tech firms often adopt the strategy of ignoring history of attempting to do something radically new.in what ways will this strategy help them?in what ways will this strategy hinder them/
*March 25, 2013*

**management**

young innovative or high tech firms often adopt the strategy of ignoring history of attempting to do something radically new.in what ways will this strategy help them?in what ways will this strategy hinder them/
*March 25, 2013*

**physics**

A 0.7 kg object is at rest. A 6.5 N force to the right acts on the object during a time interval of 3.7 seconds. What is the velocity of the object at the end of this interval?
*March 25, 2013*

**math**

I wold like to know if I have this answer right? Factor the trinomial competely. x^2-x-2 My answer is (x-2)(x+1)
*March 24, 2013*

**math**

Mark averaged 60 miles per hour during the 30-mile trip to college. Because of heavy traffic he was able to average only 40 miles per hour during the return trip. What was Mark's average speed for the round trip?
*March 24, 2013*

**math**

After six biology tests, Ruben has a mean score of 73. What score does Ruben need on the next test to raise his average (mean) to 75?
*March 24, 2013*

**Finite Math**

The reading list for a literature class has 6 fiction and 8 nonfiction books. A student is to write a report on 5 books from the list during the semester. The report must include at least 1 and at most 4 reports of fiction books. In how many ways can the selection of books be ...
*March 23, 2013*

**Math**

I've read over it, but I still don't understand how to add together bulbs from the Mandelbrot sets. Please help? I need to know how to add the 1/4 bulb to the 1/6 bulb and the 1/8 bulb to the 1/6 bulb. Thank you!
*March 22, 2013*

**Chemistry**

A 5.0-g Sample of KBr at 25.0 degrees celsius dissolves 25.0 mL of water also at 25.0 degrees celsius. The final equilibrium temperature of the resulting soltution is 18.1 degrees celsius. What is the enthalpy of of solution in kilojoules per mole of KBr?
*March 20, 2013*

**Calculus - Optimization **

The cost of fuel for a boat is one half the cube of the speed on knots plus 216/hour. Find the most economical speed for the boat if it goes on a 500 nautical mile trip.
*March 20, 2013*

**chemistry**

if the molar mass of BaCl2 is 208.3 g/mol, how many grams are present in 0.25 moles?
*March 19, 2013*

**math/ratios**

8/10?
*March 18, 2013*

**math/ratios**

There are 77 students in the student council. The ratio of girls to boys is 7:4. How many girls are in the student council?
*March 18, 2013*

**math/ratios**

There are 77 students in the student council. The ratio of girls to boys is 7:4. How many girls are in the student council?
*March 18, 2013*

**math**

There are 77 students in the syudent council. The ratio of girls to boys is 7:4. How many girls are in the student council?
*March 18, 2013*

**Algebra 1**

Can you please help me with this question? I put parenthesis to make it look less confusing. (10)/(x)-(10)/(x-3)=(-3)
*March 18, 2013*

**science help?**

(a) One such reaction fuses two nuclei of carbon-12 ( 6 12C ) to form an atom of neon ( 10 20Ne ) with the emission of an α-particle. Write an equation for this process, indicating the atomic number and mass number of each of the products in the usual way. (b) Another ...
*March 18, 2013*

**PLEASE HELP. LANGUAGE ARTS.**

14. touch 17. A or D?? 18. developing more confidence 19. matter-of-fact
*March 15, 2013*

**PLEASE HELP. LANGUAGE ARTS.**

I will give the questions and my answers. Someone check it please. Read the passage below and answer the questions that follow. To the Top “Great works are performed, not by strength, but by perseverance.” -Samuel Johnson Have you ever wanted to give up on something ...
*March 15, 2013*

**Language Arts**

I will give the questions and my answers. Someone check it please. Read the passage below and answer the questions that follow. To the Top “Great works are performed, not by strength, but by perseverance.” -Samuel Johnson Have you ever wanted to give up on something ...
*March 14, 2013*

**Chemistry**

Indicate the concentration of each ion or molecule present in a mixture of 45.5 mL of 0.274 M NaCl and 65.5 mL of 0.0246 M (NH4)2CO3. Assume that the volumes are additive. [Cl-] [NH4+] [CO32-]
*March 13, 2013*

**Chemistry**

What mass of silver chloride can be prepared by the reaction of 160.0 mL of 0.25 M silver nitrate with 110.0 mL of 0.20 M calcium chloride? Calculate the concentrations of each ion remaining in solution after precipitation is complete. (Enter a 0 if none of the ion remains.) ...
*March 13, 2013*

**Chemistry**

Indicate the concentration of each ion present in the solution formed by mixing the following. Assume that the volumes are additive: 3.60 g of KCl in 76.5 mL of 0.274 M CaCl2 solution [K+] = [Cl-] =
*March 13, 2013*

**Chemistry**

Calculate the molarity of a solution made by dissolving 16.0 grams of Na2CrO4 in enough water to form exactly 555 mL of solution.
*March 13, 2013*

**Physics **

A man is standing on a cliff and throws a ball outward 50m/s at an angle of 53 degrees. It hits the base of the cliff in 10 seconds. Find: a) The height of the cliff b) the angle at which the ball goes into the sea c) if the ball will hit a boat 150m out to sea.
*March 12, 2013*

**Physics **

A ball is dropped from a height of 20m. When it bounces, it rebounds with a speed that is one half of the speed at which it hits the ground. How high does it bounce?
*March 12, 2013*

**math**

thank you. 15.25 x 190
*March 11, 2013*

**math**

JOHN is planting a garden. He wants to put a fence around it. If the garden is 3,000cm wide and 6,500 cm long, how much fence does he need? What will the cost be if fence is 15.25 per meter
*March 11, 2013*

**science help?**

no table and no diagram for this question a)What speed would water have to drop below to deposit a 250μm diameter grain of sediment?......... answer to unit ms^-1 b)What speed would water have to drop below to deposit a 500μm diameter grain of sediment?..............
*March 9, 2013*

**help ??????????????????**

no table and no diagram for this question a)What speed would water have to drop below to deposit a 250μm diameter grain of sediment?......... answer to unit ms^-1 b)What speed would water have to drop below to deposit a 500μm diameter grain of sediment?..............
*March 9, 2013*

**science help?**

a)What speed would water have to drop below to deposit a 250μm diameter grain of sediment?................ms^-1 b)What speed would water have to drop below to deposit a 500μm diameter grain of sediment?................ms^-1
*March 9, 2013*

**grammar**

thank you
*March 8, 2013*

**grammar**

object of preposition?
*March 8, 2013*

**grammar**

preposition?
*March 8, 2013*

**grammar**

For whom should we ask? IS whom subject ,object of preposition or dir ect object?
*March 8, 2013*

**grammar**

thank you
*March 8, 2013*

**grammar**

Everyone to whom she spoke smiled. Is whom the subject,object of preposition or direct object?
*March 8, 2013*

**Physics**

A 90kg stuntman falls from a building that is 80 meters tall. (Vo = 0)Fortunately, the stuntman is attached to a cable that is wrapped around a flywheel (massive spool), with a radius of 0.5m. If the man takes 8 seconds to reach the ground: (a) what is the moment of inertia of...
*March 7, 2013*

**physics**

A 90kg stuntman falls from a building that is 80 meters tall. (Vo = 0) Fortunately, the stuntman is attached to a cable that is wrapped around a flywheel (massive spool), with a radius of 0.5m. If the man takes 8 seconds to reach the ground, (a) what is the moment of inertia ...
*March 7, 2013*

**math**

thank you I UNDERSTAND IT NOW
*March 7, 2013*

**math**

ed needs to purchase 5.6 meters of tape. if each roll contains 80 cm and costs 5.00 what is the total cost of the tape ed must buy
*March 7, 2013*

**english**

in which sentence does the objective complement function as an adjective? a-while gardeners love rain, picnickers consider it a nuisance. b-skiers called the record snowfall incredible! c-the hurricane forecasters named the next storm Bob.
*March 7, 2013*

**math**

The scale factor of 2 similar polygons is 3:4. If the perimeter of the large polygon is 200, what is the perimeter of the small polygon?
*March 6, 2013*