Saturday

August 23, 2014

August 23, 2014

Total # Posts: 69,776

**algebra**

Select the approximate values of x that are solutions to f(x)=0, where f(x) = -2x^2+8x+5
*June 17, 2014*

**chemistry**

"To save on production costs, most automobile bumpers are never coated with more than 200 g of chromium. Determine how much time a standard bumper should be immersed in a chromium vat." This is what I have so far- 96,485 coulombs are required to plate 1 Cr; 52/6 = 8....
*June 17, 2014*

**MATH **

Solve the system of linear equations 2x+y-3z=4 4x+2z=10 -2x+3y-13z=-8 *im so lost (all these numbers are in one problem)
*June 17, 2014*

**algebra**

scs paid $4400 to buy desks.it bought d desks all together.What algebric statement shows the cost for one desk?
*June 17, 2014*

**medical billing**

if an institutional review board is involved in a request information, the information is likely by a
*June 17, 2014*

**Organic Chemistry**

These questions are somewhat difficult. I believe I am on the right track, but I want to make sure. 1. List these compounds in order of decreasing reactivity towards nitration. Explain your answer. a) acetanilide b) bromobenzene c) toluene d) acetophenone 2. a) Which is the ...
*June 17, 2014*

**physics**

A person sitting quietly in a room on a winter day may lose heat primarily by radiation from the outer surface of her clothes to the walls of the room. If the walls are at 11.5° C and the rate of radiation is 75.2 kcal/h (a typical basal metabolic rate), what is the ...
*June 17, 2014*

**Leadership**

Any order which you think is important! I don't know but I need help and assistantance
*June 17, 2014*

**Leadership**

I need help to put these characteristics in order. Please help me!! - dance ability -leadership -morality -ethical -responsible -caring -structured -organized -initiative -respectful
*June 17, 2014*

**biology**

Discuss the concept of species. What ways do modern taxonomists use to distinguish different species?
*June 17, 2014*

**Statistics**

there is a 1/5 (.20) probability that one type of appliance will break with in two years. find the probability that 4 out 15 such appliances willl break within that time period
*June 17, 2014*

**MaTh..**

Determine whether the system of equations is in row-echelon form. x-y+3z=-11 y+8z=-12 z=-2
*June 17, 2014*

**math**

Mr. Simon landscapes new houses for a building contractor. He charges by the square meter of yard space plus a setup fee. He billed the contractor $2,150 for a 400-square- meter yard and $1,650 for a 300-square-meter yard. Write an equation in the form y = mx + b that can be ...
*June 17, 2014*

**physics**

A sailboat race course consists of four legs, defined by the displacement vectors , , , and , as the drawing indicates. The magnitudes of the first three vectors are A = 2.80 km, B = 4.70 km, and C = 4.50 km. The finish line of the course coincides with the starting line. ...
*June 17, 2014*

**gometry**

in a circle of radius 17cm, two parallel chords are drawn on opposite sides of a diameter. the distance between the chords is 23cm. if the length of one chords is 16cm, find the length of the other.
*June 17, 2014*

**Maths**

30% of the pupils in a class are boys.there are 21 girls.how many pupils are there in the class in all?
*June 17, 2014*

**Maths**

30% of the pupils in a class are boys.there are 21 girls.how many pupils are there in the class in all?
*June 17, 2014*

**math**

'a gardener plants an orchid with 5776 trees. in each row there were as many trees as the number of rows. find the number of rows'
*June 17, 2014*

**math**

Approximately how much principal would need to be placed into an account earning 3.575% interest compounded quarterly so that it has an accumulated value of $68,000 at the end of 30 years?
*June 17, 2014*

**chemistry**

Calculate the volume of nitrogen gas that will be produced in the air bag of a car when 88,8g of sodium azide is thermally decomposed at 22 C to give the bag a pressure of 1,10 atm
*June 17, 2014*

**English**

Which one of the following statements about making your writing fun to read is not correct? A. The conversation you write must sound natural for the characters. B. An anecdote or humorous quotation is often more convincing than a strong argument. C. Direct quotations should be...
*June 16, 2014*

**English**

Which statement is most accurate regarding the speaking-writing connection? A. The words used by writers are not normally used in speaking. B. To own a word, speak it. C. Written words seldom reflect the words people use when they speak. D. To own a word, write it over and ...
*June 16, 2014*

**english**

What is the name of the common error in the following sentence? Having risen because of the rains, the hikers were unable to cross the river. A. Run-on sentence B. Infinitive phrase C. Prepositional phrase D. Dangling modifier correct C. PrepositioNal phrase
*June 16, 2014*

**writing**

Choose the connective that belongs in the blank in the following sentence. Everyone appeared to be having a good time. _______, my impressions may have been wrong. A.In other words B.Furthermore C. Of course D. In fact CA. C. Of course
*June 16, 2014*

**Physics**

A high diver of mass 70 kg jumps off a diving board and enters the water with the speed of 10 m/s the average upward resistance force of water exerts on the diver is 200 N. How far in the water will the diver travel before coming to rest?
*June 16, 2014*

**Physics**

An antitank weapons fires a 3.5 rocket, which acquires a speed of 70 m/s after traveling 90cm down a launching tube. Find the net force during lonch?
*June 16, 2014*

**physics**

A 5kg crate falls from height of 2 m into an industrial spring scale. When the crate comes to rest the compression of the spring is 25 cm what is the spring constant?
*June 16, 2014*

**MATH**

What if we have .. integration of xe^(|x|) dx from negative infinity to x.
*June 16, 2014*

**MATH**

what is the integration of e^-|x| from negative infinity to x ?
*June 16, 2014*

**American National Government**

If the President requests a Congressional authorization for the use of force, Congress
*June 16, 2014*

**Reading**

What are some good books to read for 7th grade?
*June 16, 2014*

**history**

After the election of 1890, organized groups supporting farmers called for the formation of a third party that became generally known as the _______ Party.
*June 16, 2014*

**CHEMISTRY **

COPPER
*June 16, 2014*

**algebra 2**

The height of an arrow shot in the air is given by the function h(t)=-16t^2+144t+24, where h(t) represents the height in feet, and t represents the time in seconds. what is the maximum height of the arrow? how long does it take to reach the maximum height? how long does it ...
*June 16, 2014*

**Statistics**

Assume that a standardized test is designed to have the mean score of 100 and the standard deviation of 15. At the 95% confidence interval, how large does the sample size have to be if the margin of error is to be 3 points?
*June 15, 2014*

**math**

Compute Sun Jung's estimated tax payment for the second quarter. She is self-employed and she expects to earn $61,760 this year. Her estimated income tax rate is 23%. For self-employed persons, social security tax is 12.4% of wages up to $106,800, and Medicare tax is 2.9% ...
*June 15, 2014*

**chemistry**

calculate the percentage by mass of oxygen in trioxonitrate(v) acid
*June 15, 2014*

**chemistry**

calculate the percentage by mass of ozygen in trioxnitrate5 acid H-1, N-14, O-16
*June 15, 2014*

**English**

Which of these two sentences is correct? Is there a different correct format? This construction is different than in English. This construction is different from English.
*June 15, 2014*

**physics**

a pendelum in a fathers clock measures .90m from the support to the centerof the bob
*June 15, 2014*

**physics**

The cg of the 50.0 N pole held by the pole vaulter is 2.00 m from the left hand, and the hands are 0.700 m apart. Calculate the force exerted by each hand.
*June 14, 2014*

**Physics**

A person is carrying a plank of wood 2.00 m long with one hand pushing down on it at one end with a force F1 and the other hand holding it up at 50.0 cm from the same end of the plank with force F2. If the plank has a mass of 20.0 kg and its center of gravity is at the middle ...
*June 14, 2014*

**Physics**

Use Newton's second law: F=ma F=(1 kg)*2 m/s² = 2 N If F=2N and a=8m/s², then m=F/a
*June 14, 2014*

**Physics**

Use Newton's second law: F=ma, or a=F/m
*June 14, 2014*

**Algebra**

simplify 5!/3! A. 5 B. 20 C. 40 D. 120
*June 13, 2014*

**Algebra**

A ramp leads up to a building. The top of the ramp is 4 feet above the ground, and the bottom is 14 feet from the building. what is the length of the ramp? I think the answer is 18 ft. choices are: A. 18.6ft B. 18ft C. 14.6ft D. 10ft
*June 13, 2014*

**Algebra**

would it be B
*June 13, 2014*

**Algebra**

Ms. Chang has 24 students in her class, and 8 of them are boys. What is the ratio of boys to girls? A. 1:2 B. 1:3 C. 2:1 D. 2:3 I think the answer is D but i'n not sure.
*June 13, 2014*

**Physics**

Use 1/f=1/di + 1/do and Magnification M=hi/ho=-di/do Use metres throughout do=0.30 f=+0.08 m (converging lens) di=1/(1/f-1/do) =0.1091 (image distance) So image is real (di >0) and on the right-hand (emerging) side of the lens. M=-di/do=-0.364 (image smller, inverted, M<0)
*June 13, 2014*

**BIB 351**

What was Balaam's relationship to Yahweh according to the Book of Numbers 22-25? Please Help!
*June 13, 2014*

**Algebra**

A garden is going to be built in the city park. the garden height is 5m. and the width is 7.5 m. a. A short fence will be built around the perimeter of the garden region. Find the number of meters of fencing required. Round your answer to the nearest tenth of a meter. Show all...
*June 13, 2014*

**Algebra**

Thank you
*June 13, 2014*

**Algebra**

1. A printer can print 40 pages in 1.6 minutes. a. Write and solve a proportion to find the number of pages that the printer can print in 5 minutes. Show your work. b. Lana wants to use the printer to print 150 pages. Find the time, in minutes, it will take to print 150 pages...
*June 13, 2014*

**algebra**

cube labeled 1 to 6 rolls 450 times. predict rolling less than 3
*June 13, 2014*

**algebra 2**

Maria created a graph of B(t), the temperature over time. For the interval between t = 3 and t = 7, the average rate of change in her graph of B(t) is 8. Which statement must be true?
*June 13, 2014*

**physics**

A car of mass 537 kg is moving 32.0° North of East at a speed of 22.7 m/s. What is the magnitude of the momentum of the car? (magnitude - how big is it? ignore direction)
*June 13, 2014*

**Statistics**

1-P(B|A) =1-P(B∩A)/P(A) =( P(A)-P(B∩A) ) / P(A) =P(A\B)/P(A) P(B'|A) =P(B'∩A)/P(A) =P(A\B)/P(A) So yes, they are equivalent. =
*June 13, 2014*

**College Algebra **

A quadratic function has its vertex at the point (-9,8). The function passes through the point (9,4). When written in vertex form, the function is f(x)= a(x-h)^2 +k, where a) h)-9 k)8 4=a(9)^2+8 4=a(9+9)^2+8 4=a(18)^2+8 4=a(332) a=0.01204 I was able to find both h & k. but the...
*June 12, 2014*

**College Algebra **

The graph of a quadratic function f(x) is shown above. It has a vertex at (-2,4) and passes the point (0,2). Find the quadratic function y=a(x-(-2))^2+4 y=a(x+2)+4 2=a(x+2)+4 -4 -4 -2=a(0+2)/2 -1+ a function -1(x+2)+4 ? Im not sure where Im going wrong but my answer was ...
*June 12, 2014*

**physics**

The weightless strut in the figure below is not attached to the wall; it is prevented from falling only by friction. (Let w = 360 N, L = 5.25 m and h = 3.25 m.) (a) Find the magnitude of the force of friction between the wall and the strut. (b) Find the normal force exerted by...
*June 12, 2014*

**physics**

(a) Find the force P that must be applied to a piston of area 10.60 cm2 to produce sufficient fluid pressure to support a car weighing 12,101 N by means of a column of fluid of cross sectional area 285 cm2 as seen in the figure below. F1/A1=F2/A2 F1=F2*A1/A2 12101*10.6/285 =...
*June 12, 2014*

**Science**

What is a stimulus?
*June 12, 2014*

**MATH**

what is the integration of x . e ^(-x) ? Can you please explain it :) Thanks
*June 12, 2014*

**MATH**

integration of e^(lambda.x) = ?
*June 12, 2014*

**Math**

8\7=[8\. +)
*June 12, 2014*

**Physics**

A 7.50 kg bowling ball strikes a stationary 4.50 kg bowling ball. After the collision, the 4.50 kg ball is traveling 8.50 m/s 30.0° east of north; the 7.50 kg ball is traveling 6.50 m/s 20.0° south of east. What was the initial velocity (magnitude and direction) of the...
*June 12, 2014*

**whole number**

At the end of the year, a library reported 32 books lost or stolen, and 24 books were sent out for repair. If the library originally had 1,219 books, how many were left on the shelves or in circulation?
*June 12, 2014*

**Physics**

Three resistors of value 1.0 , 2.0 and 4.0 are connected in a parallel circuit with a 6.0 V battery. a) What is the total equivalent resistance? b) What is the across each resistor? c) The power delivered to the 4.0 resistor?
*June 12, 2014*

**Physics**

3) What is the emf of a battery with an internal resistance of 0.15 if the battery delivers 1.5 A to an externally connected 5.0 resistors?
*June 12, 2014*

**physics**

A 200 – W computer power supply is on 10 hours per day. If the cost of electricity is $0.15/kWh, what is the cost (to the nearest dollar) to run the computer every day for a year (365 days)?
*June 12, 2014*

**physical science(chemistry change)**

095.5
*June 12, 2014*

**physical science(chemistry change)**

*June 12, 2014*

**science-chemistry**

4.35*10^-2
*June 12, 2014*

**ALgebra**

1500x
*June 12, 2014*

**math**

Jacqueline Strauss, a 25- year- old personal loan officer at Second National Bank, under-stands the importance of starting early when it comes to saving for retirement. She has committed $ 3,000 per year for her retirement fund and assumes that she’ll retire at age 65. a...
*June 12, 2014*

**math**

A hallway measuring 90 feet x 7 feet requires 1/2 a fluid ounce of cleaning solution per square foot. How much cleaning solution is required to clean the hallway
*June 11, 2014*

**English**

I was wondering for ninth grade, how long should an essay on 3 of Katherina (from taming of the shrew )characteristic be. And how long should each paragraph be.. Mine is not as long as my friends so I was wondering
*June 11, 2014*

**algebra**

A pound of tin is worth $2 more than a pound of copper. Three pounds of tin are mixed with 7 pounds of copper to make bronze that sells for $3.85 per pound. How much is a pound of tin worth
*June 11, 2014*

**Math**

How would I find the derivative of (8x^3)/sqrt(3x-2)?
*June 11, 2014*

**trig**

how do you find algebraically the measure of the obtuse angle, to the nearest degree, that satisfies the equation 3 sec theta = 5 is it sec theta = 5/3 and then cos -1 (5/8) = 0.4
*June 11, 2014*

**Science**

What is the difference between conserving energy and energy efficiency? What are 5 benefits of conserving energy?
*June 11, 2014*

**math**

infinity / 8 = ?
*June 11, 2014*

**Distribution and warehousing**

The risk of distribution of goods and materials are: -Sudden scarcity of raw materials. -Rising costs due to increased demand from competitors. -Political events, such as revolutions or transportation worker strikes that may slow delivery of raw materials.
*June 11, 2014*

**Math**

If (a + b / 10) = (a - 0.1b^2 / a - b), what is the value of a? F. 0.001 G. 0.1 H. 1 J. 10 K. 100
*June 11, 2014*

**pueblo**

In ƒ¢ABC, if the lengths of sides a and c are 8 centimeters and 16 centimeters, respectively, and the measure of ÚC is 35‹, what is the measure of ÚA to two decimal places?
*June 11, 2014*

**physics**

A body is to be projected at an angle with a velocity 24m/s just to pass over an obstacle 14m high at adistance of24m.then angle is what.
*June 11, 2014*

**physics**

The weightless strut in the figure below is not attached to the wall; it is prevented from falling only by friction. (Let w = 360 N, L = 5.25 m and h = 3.25 m.) (a) Find the magnitude of the force of friction between the wall and the strut. Correct: Your answer is correct. (b...
*June 11, 2014*

**Chemistry**

what is the mass of nh4cl that must dissolve in 100. grams of h2o to produce a saturated solution at 70 degrees celsius
*June 11, 2014*

**chemistry**

if an excess of nitrogen is reacted with 3.41 g of hydrogen, how many grams of ammonia can be produced?
*June 11, 2014*

**physics**

A motorist is driving at a constant velocity of 28 m/s when he decides to pass a car that is in front of him. He accelerates at a rate of 2.5 m/s2 for 3.0 seconds while passing the car. What is his velocity at the end of the 3.0 seconds?
*June 11, 2014*

**physics**

A student drops an object from a fourth floor window. The velocity of the object is measured at 29.28 m/s 3.0 seconds later. What is the acceleration of the object?
*June 11, 2014*

**Reading**

What does it mean when .... Bill clinton lifted the ban on gay in the military. Does he support gay or not? Am I a poor reader, since I cannot understand this? Please be honest..
*June 10, 2014*

**STAT**

n a planned study, there is a known population with a normal disrubution, \mu= 0, and \sigma=10. What is the predicted effect size (d) if the researchers predict that those given an experimental treatment have a mean of (a) -8, (b) -5, (c) -2, (d) 0, and (e) 10 ? For each part...
*June 10, 2014*

**history**

what is a POST RACIAL SOCIETY Do we live in one? What would one look like if we do not currently exist in one? Will we (should we) as Americans ever live in a POST RACIAL SOCIETY?
*June 10, 2014*

**Physics**

I thnk d Tension wil b T=ma+mg..m=max of load.ah may b wrong 2)force of aircraft,F=ma...
*June 10, 2014*

**Physics**

A 75.0-kg cross-country skier is climbing a 3.0o slope at a constant speed of 2.00 m/s and encounters air resistance of 25.0 N. Find his power output for work done against the gravitational force and air resistance. (b) What average force does he exert backward on the snow to ...
*June 10, 2014*

**Physics**

Thank You
*June 10, 2014*

**Physics**

(a) How high a hill can a car coast up (engine disengaged) if work done by friction is negligible and its initial speed is 110 km/h? (b) If, in actuality, a 750-kg car with an initial speed of 110 km/h is observed to coast up a hill to a height 22.0 m above its starting point...
*June 10, 2014*

**Physics**

A spring with a force constant 0f 2.50 kN/M is set upright, and a wood platform of negligible weight is fastened to its upper end. A 2.50 kg mass is gently placed on the platform and released. How far does the spring compress? What is the final equilibrium position?
*June 10, 2014*

**physics**

(a) How high a hill can a car coast up (engine disengaged) if work done by friction is negligible and its initial speed is 110 km/h? (b) If, in actuality, a 750-kg car with an initial speed of 110 km/h is observed to coast up a hill to a height 22.0 m above its starting point...
*June 10, 2014*

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