Wednesday

February 10, 2016
Total # Posts: 761

**quantitative analysis**

consider a manufacture whose total cost of producing x items is given by c(x) = 10000 + 5x+1/9x^2 a) what is the average cost function of A(x) = c(x)/x? b)how many items should the manufacturer produce in order to minimize average cost? c)what is the smallest average cost? d) ...
*November 27, 2012*

**Stats PLEASE HELP!!!**

Webcredible, a UK-based consulting firm specializ- ing in websites, intranets, mobile devices, and applications, conducted a survey of 1,132 mobile phone users between February and April 2009. The survey found that 52% of mo- bile phone users are now using the mobile Internet...
*November 18, 2012*

**4th grade math**

38700
*November 15, 2012*

**Social Studies**

True
*November 12, 2012*

**Physics**

What is one way in which the magnetic field is similar to the electric field and one way in which the magnetic field is different from the electric field?
*November 7, 2012*

**Chem Lab Help**

Carefully clean and dry a 150 mL beaker, a 250 mL beaker, and a large 155mm test tube. Remove two Alka-Seltzer tablet from their hermetically sealed packet and weight them. Use a clean (use paper towels only, NO water) mortar and pestle to grind the tablets into a fine power. ...
*October 29, 2012*

**Chem Lab Help**

Trial #1 Trial #2 Trial #3 Mass: gelatin capsule (g) .123 .118 .122 Mass: whole alka-seltzer tablet (g) 3.230 3.230 3.230 Mass: capsule + alka-seltzer sample (g) .822 .882 .677 Mass: system before reaction (g) 23.109 23.110 22.735 Mass system after reaction (g) 21.742 21.813 ...
*October 29, 2012*

**CHEMISTRY**

Describe how you would prepare 250. mL of a .500 stock solution of sodium hydroxide. (show all work)
*October 28, 2012*

**Chemistry Lab**

Im not sure how to do these questions though
*October 28, 2012*

**Chemistry Lab**

The experimental data you entered is: Trial #1 Trial #2 Trial #3 Mass: gelatin capsule (g) .123 .118 .122 Mass: whole alka-seltzer tablet (g) 3.230 3.230 3.230 Mass: capsule + alka-seltzer sample (g) .822 .882 .677 Mass: system before reaction (g) 23.109 23.110 22.735 Mass ...
*October 28, 2012*

**Physics**

A photocell shows photoelectric effect when green light shines on it. Which of the following is correct if a green light is replaced by a blue light? Electron emission would get stopped. Electrons are emitted with more velocity. Electrons are emitted with less velocity. ...
*October 25, 2012*

**math**

how to solve identity property,2nd grade
*October 24, 2012*

**Physics**

A photocell shows photoelectric effect when green light shines on it. Which of the following is correct if a green light is replaced by a blue light? Electron emission would get stopped. Electrons are emitted with more velocity. Electrons are emitted with less velocity. ...
*October 24, 2012*

**Physics**

A photocell shows photoelectric effect when green light shines on it. Which of the following is correct if a green light is replaced by a blue light? Electron emission would get stopped. Electrons are emitted with more velocity. Electrons are emitted with less velocity. ...
*October 23, 2012*

**math**

Beth cuts her pizza into thirds, how many pieces did she eat?
*October 18, 2012*

**Math**

How many 2/3 are in 3/4?
*October 15, 2012*

**Algebra**

A scuba diver dives 100 feet below the waters surface. Later she rises 78 feet. How far below the surface is the diver?
*October 13, 2012*

**Algebra 1 **

Ruffles cost $3.49 per bag. Chips-Ahoy cost $3.99 per bag. Bobby spent 42.39. If he bought 5 more bags of Chip-Ahoy than Ruffles, how many bags of each snack did he buy?
*October 11, 2012*

**Physics**

Its postive you dummy
*October 11, 2012*

**Math**

5x6=5x4+5xb
*September 27, 2012*

**7th grade Art**

1.B 2. C 3 A C
*September 26, 2012*

**physics**

1) A boy sledding down a hill accelerates at 1.40 m/s, If he started at rest, in what distance would he reach a speed of 7.00 m/s? 2) An Elevator is moving upward at 1.20 m/s when it experiences an accelerstion of 0.31 m/s downward, over a distance of 0.75m. What will its ...
*September 24, 2012*

**chemistry**

how many grams of NaOH should be used to make 200 mL of a 0.24M solution starting with a .4M HCL solution
*September 22, 2012*

**chemistry**

Assuming that 0.5 grams of a 1.0 gram sample is CaCO3, what should the concentration of HCl(M) be if you want to use 25.0 mL for the titration?
*September 22, 2012*

**Physics**

Thinking Physic-ly: On some toll roads, the ticket is stamped with the time you enter the toll road and the time you exit. How can the toll taker determine if you were speeding?
*September 19, 2012*

**science**

what is the volume of a cabinet 1.20m by 5m by 75cm
*September 18, 2012*

**Calculus**

can you solve it by using separation of differential equations
*September 9, 2012*

**Calculus**

A snowball has a radius of 3 inches. Assume the rate with which the volume of the snowball melts is proportional to its surface area. If, after 1 hour, the radius of the snowball is 2.9 inches, predict what the radius will be after one day. using separation of ordinary ...
*September 9, 2012*

**calculus**

can you solve it with separation of differential equation
*September 9, 2012*

**Economics**

possibly
*September 7, 2012*

**math**

A rectangular slab of concrete is cut from a large block. The slab measures 10.4 inches thick, 1.8 feet long, and 0.0021 miles wide. Find its volume in cubic feet.
*September 6, 2012*

**finite math**

Okay,so: Assume that there are 8 unfilled roles: 3 male and 5 female. There are 5 men and 6 women, including Sally, auditioning for a part in the play. How many of these casts include Sally?
*September 5, 2012*

**social studies**

Is there 51 states? Is DC considered as 5lst or Puerto Rico 51st
*September 3, 2012*

**physics **

Pulling a 1.92 kg. box at a constant speed requires a force of 14.12 N. What is the coefficient of friction (µ) for this box?
*August 24, 2012*

**physics **

A 1.66 kg. load is pulled by a force of 11.03 N. If the coefficient of friction (µk) for this load is 0.602, and the load starts at rest, how long will it take to accelerate the load from rest to a final velocity of 4.90 m/s?
*August 24, 2012*

**physics **

A 3.18 kg. bucket of water is being lowered into a well. It is accelerating downwards at -0.54 m/s2. What is the upwards tension in the rope
*August 24, 2012*

**physics **

A train consists of 40 freight cars, each having a mass of 2.71 × 105 kg. If the engine (which has twice the mass of a freight car) exerts a net force of +1.12 × 105 N, what will be the acceleration of this train?
*August 24, 2012*

**physics **

A bullet is fired through a wall that is 10.0 cm. thick. The bullet entered the wall at 400. m/s, and it exited from the wall at 220. m/s. What was the average acceleration of the bullet while it was passing through the wall?
*August 24, 2012*

**MATH 5TH GRADE (VARIABLES AND EXPRESSIONS)**

A number of apples divided into 12 baskets
*August 23, 2012*

**physics **

A ranger in a national park is driving along at 17.9 m/s when a deer jumps into the road 65. m ahead of the vehicle. After a reaction time of t seconds, the ranger applies her brakes, which produce an acceleration of -2.8 m/s2. What is the maximum reaction time she can have if...
*August 21, 2012*

**physics **

While doing some interval training, a runner runs a distance interval at a pace of 4.00 m/s. She then runs the next interval at 4.500 m/s and the last interval at 5.500 m/s. Assuming each interval is exactly 125. m, what is her average speed for this workout?
*August 21, 2012*

**physic**

In order to qualify for the finals in an race, a runner must achieve an average speed of 5.24 m/s for the entire mile race. If she runs at a constant speed of 4.63 m/s for the first half of the 1609 meter race, what constant speed must she maintain for the second half of the ...
*August 21, 2012*

**physics **

Bottled water costs $0.55 for a 0.5 liter bottle. What would it cost to fill a bathtub with bottled water. The bathtub holds 7.13 cubic feet of water. (Recall that 1.00 inch = 2.54 cm, and that a liter is exactly 1000 cm3).
*August 21, 2012*

**AP World History**

What are the limits to studing the interactions across the worlds major water basins?
*August 14, 2012*

**AP World History**

what are the benifits to studing the interactons across the worlds major water basins?
*August 14, 2012*

**health**

same here.....can we please get a answer? :P
*August 11, 2012*

**Finance**

A firms growth rate is 8%, the ROA = 10%, the debt ratio is 20%. The stock is selling at $36. What is the return on equity?
*June 26, 2012*

**chemistry**

Hydrochloric acid reacts with calcium to form hydrogen and calcium chloride. If 100 grams of hydrochloric acid reacts with 100 grams of calcium, what is the limiting reactant? 2HCl + Ca --> CaCl2 + H2
*June 18, 2012*

**math**

I don't get these problems at all and i have to turn 22 questions in on this tomorrow PLEASE HELP!!! 6x+2=x-1 and 2(x-1/2)=4(x+1/4)
*May 15, 2012*

**Calculus**

find the absolute extrema of f(x)=sin pi x on [-1,2] Not sure how to do this problem....
*April 28, 2012*

**geometry**

two sides of an equilateral trianlge measure (2y+3) units and (y^2-5) units. if the perimeter of the triangle is 33 units, what is the value of y?
*April 15, 2012*

**geometry**

two sides of an equilateral trianlge measure (2y+3) units and (y^2-5) units. if the perimeter of the triangle is 33 units, what is the value of y?
*April 15, 2012*

**geometry**

Two lines intersect to form two pairs of vertical angles.Angle 1 with measure (20x + 7) degrees and angle 3 with measure (5x + 7y + 49) degrees are vertical angles. Angle 2 with measure (3x - 2y + 30) degrees and angle 4 are vertical angles.Find the values x and y and the ...
*April 15, 2012*

**geometry**

A rectaungular prism has a volume of 360 inches cubed. What base measurements could the prism have?
*April 9, 2012*

**Finite Math**

Find the sample space which is 16 red + 17 white = 33 total. 33C3 = sample space= 5456 Then do 0 red balls = C(16,0)*C(17,3)/5456 1 red ball = 16c1* 17c2/5456 ... so on
*April 5, 2012*

**math**

reduce 4/15 to lowest terms
*April 4, 2012*

**grammar**

i expect a friend to be both honest and a loyal person is this using correct parallel structure
*April 3, 2012*

**math**

The ratio of girls to boys in a science class is 5:6. Can there be 15 boys in the class? Explain why or why not.
*April 1, 2012*

**math**

Draw a square/ peremeter is 2
*March 22, 2012*

**Geometry**

Hi, I'm having a difficult time understanding a couple of Geometry questions on my homework and I'd really appreciate it if someone could answer them and explain to me how to get the same answer. Question 1: A regular pentagon has an apothem of 3.2 m and an area of 37....
*March 15, 2012*

**algebra**

You earned the following scores on five science tests: 75, 82, 90,84, and 71. You want to have an average score of at least 80 after you take the sixth test. a. Write and solve an inequality to find the possible schores that you can earn on your sixth test in order to meet ...
*March 7, 2012*

**Math<3**

-2 ( 9-4 ) + 1 = -2 ( 5 ) + 1 = -10 + 1 = -9
*March 6, 2012*

**Math**

2.54 cm = 1 in 48cm * ( 1 in / 2.54 cm ) = 18.898 in
*March 6, 2012*

**physics**

A 55-kg woman contestant on a reality television show is at rest at the south end of a horizontal 148-kg raft that is floating in crocodile-infested waters. She and the raft are initially at rest. She needs to jump from the raft to a platform that is several meters off the ...
*March 6, 2012*

**4 th grade Math**

2/3 = 4/6 (reading) + 1/6 (math) = 5/6 (reading/math) 6/6 - 5/6 = 1/6 (science) = 12 kids 12 kids = 1/6, 12*6 = 72 kids total
*March 6, 2012*

**physics**

nevermind, figured this one out...0.047
*March 6, 2012*

**physics**

You throw a 141 g ball straight up to a height of 45.0 m. Assume that the displacement of your hand is 0.70 m as you throw the ball straight up. How long is the ball is in your hand?
*March 6, 2012*

**PHYSICS**

conservation of mech energy... look at two spots, when the bob is at the lowest, and the highest... KE (lowest) + KE (highest) = U (lowest ) + U (highest) 40J + 0J = 0J + mgh 40J = 2.5kg(9.81m/s^2)(height) height = 1.6309m
*March 6, 2012*

**physics**

Half
*March 4, 2012*

**physics**

A rubber ball of mass 19.5 g is dropped from a height of 1.85 m onto a floor. The velocity of the ball is reversed by the collision with the floor, and the ball rebounds to a height of 1.55 m. What impulse was applied to the ball during the collision?
*February 24, 2012*

**MATH**

How do I find JK for J(3, 8)and K(-1, 4)? Please help!
*February 21, 2012*

**GEOMETRY**

If EF=3x-10, FG=2x-15 and EG=20, find the value of x, EF and FG.
*February 20, 2012*

**GEOMETRY**

Which property supports the statement: "If AC=DF, then DF=AC" Symmetric Reflexive Transitive Substitution
*February 20, 2012*

**GEOMETRY**

Which statement is contrapositive of the conditional: If a triangle is isosceles, then it has 2 congruent sides. 1. If a triangle does not have 2 congruent sides, then it is not isosceles. 2. If a triangle is isosceles, then it does not have 2 congruent sides. 3. If a triangle...
*February 20, 2012*

**grammar**

what is the direct object in the head of the stables often mistreated agba and the young colt
*February 14, 2012*

**Physics**

Three charged particles form a triangle: particle 1 with charge Q1 = 84.0 nC is at xy coordinates (0, 4.60 mm), particle 2 with charge Q2 is at (0, -4.60 mm), and particle 3 with charge q = 40.0 nC is at (6.40 mm, 0). What are the x component and y component of electrostatic ...
*January 29, 2012*

**Physics**

Three identical conducting spheres initially have the following charges: sphere A, 4Q; sphere B, -9Q; and sphere C, 0. Spheres A and B are fixed in place, with a center-to-center separation that is much larger than the spheres. Two experiments are conducted. In experiment 1, ...
*January 29, 2012*

**physics**

A force of 0.053 N is required to move a charge of 36 µ a distance of 30 cm in a uniform electric field. What is the size of the electric potential difference between the two points?
*January 12, 2012*

**volta**

What the formula for finding the % of 35% of 22. I know the answer is 7.7, but how do u get that answer
*January 11, 2012*

**physics**

Joe stands on a bridge kicking stones into the water below. If he kicks a stone with a horizontal velocity of 2.60 m/s, and it lands in the water a horizontal distance of 8.10 m from where Joe is standing, what is the height of the bridge? Enter m as unit.
*January 9, 2012*

**geometry**

An architect needs to design a rectangular room with an area of 75 ft What dimensions should he use in order to minimize the perimeter? Round to the nearest hundredth, if necessary
*January 6, 2012*

**physics**

After a shipwreck, a solid steel spoon lies at the bottom of the ocean, 5.75km below the surface. What's the water pressure at that depth? Find the fractional volume change in the spoon due to compression forces.
*December 11, 2011*

**Physics**

A 0.15 kg ball of dough is thrown straight up into the air with an initial speed of 5.7 m/s. a.)Find the momentum of the ball of dough at its maximum height. b.) Find the momentum of the ball of dough halfway to its maximum height on the way up.
*December 8, 2011*

**Math **

Peter bought a computer at a local electronics store. If the computer cost $750.00, and tax was 7%, how much did Peter pay in tax?
*December 8, 2011*

**math**

2sin2x+1=0
*December 1, 2011*

**trig**

Use the Law of Sines to solve each triangle. P=110 degrees p=125, r=200 in triangel PQR
*November 26, 2011*

**Math**

Find two consecutive whole numbers such that 3/4 of the first number is 5 more than the second number.
*November 17, 2011*

**Math**

Find two consecutive whole numbers such that 3/4 of the first number is 5 more than the second number.
*November 17, 2011*

**physics**

An 83.2-kg propeller blade measures 2.24m end to end. Model the blade as a thin rod rotating about its center of mass. It's initially turning at 175rpm. Find the blade's angular momentum, the tangential speed at the blade tip, and the angular acceleration and torque ...
*November 12, 2011*

**physics**

An 83.2-kg propeller blade measures 2.24m end to end. Model the blade as a thin rod rotating about its center of mass. It's initially turning at 175rpm. Find the blade's angular momentum, the tangential speed at the blade tip, and the angular acceleration and torque ...
*November 12, 2011*

**math**

Find the mystery number im a number between 300 and 400 im divisible by 3 and 4 . but not 9 my tens digit is a square number the sum of the hundreds digit and the tens digit is a prime number. find the mystery number
*November 8, 2011*

**enlish/grammar**

Here are a few more of the predicate adjective or predicate noun sentences I need help with to see if I used the right one. Wildflowers look lovely on the hillsides. PA Mounties on horesback are a common sight. PN The Royal Canadian Mounted Police's nickname is the ...
*November 7, 2011*

**enlish/grammar**

I was wondering if these sentences are labeled right with either predicate noun or predicate adjective? Their presence was necessary in the far north country in the early days. preicate noun Now they are famous throughout the world. predicate noun They are the subject of many ...
*November 7, 2011*

**science**

On Apollo missions to the Moon, the command module orbited at an altitude of 150 above the lunar surface. How long did it take for the command module to complete one orbit?
*November 3, 2011*

**math**

long one is the minute hand short one is the hours hand
*November 1, 2011*

**math's**

5050 formula sum of sequence of numbers=(n/2)(first number plus last number) n is total amount of digits so total = (100/2)(1+100) =50(101) =5050
*November 1, 2011*

**math**

The symbol > means the first number is greater than the second. The symbol < means the first number is less than the second. These are true statements. 5 > 2 3 < 10 Your answer is 4 4/3 > 4 1/2
*November 1, 2011*

**psychology**

According to Piaget, egocentrism refers to?
*October 27, 2011*

**physics**

Tigger likes to play golf. For this particular shot, the distance between the spine and the clubhead (aka the distance of the golfclub + arm) is 1.6 m. When the clubhead hits the ball, it is travelling at 50 m/s. How fast is the body and the club rotating? That is, what is the...
*October 26, 2011*

**Chemistry**

2h2s g 3o2 g 2so2 g 2h2o g H=-1036KG/MOL calculate enthalpy change in kj when 18.2 g of hydrogen sulfide are burned
*October 23, 2011*