Friday
July 29, 2016

Posts by rob

Total # Posts: 387

Precalculus
Write the sum using sigma notation. -3/8 + 4/7 - 5/6 + 6/5 - 7/4+ 8/3
July 1, 2016

Math - volume about y axis
Oh wait, shouldnt the limits be [0,-1] not [0,1]? Also is the answer then pi/2?
May 30, 2016

Math - volume about y axis
Thanks. Would that just be answer, or would I need to multiply the integral by 2?
May 30, 2016

Math - volume about y axis
Find the volume generated by revolving the region enclosed above by the x-axis and the graph of the function f(x) = x^2 -1 about the y-axis. I cant make sense of it. What is it asking me to do? What are the integral bounds?
May 30, 2016

Math - integrals
Oh, thank you. The 5∫3 just mean the upper and lower limts, I didnt know how else to write it
May 29, 2016

Math - integrals
Would it be possible to give me a more step by step? Im lost
May 29, 2016

Math - integrals
Use the sub x-1 = sqrt(5)tan(u) to evaluate 5∫3 1/(x^2-2x+6)^3/2 I dont know how to use the substitution
May 29, 2016

math
16cm
May 8, 2016

Physics
I wish i could help, i just know we both gon get rekt in phys140 together
May 8, 2016

Physics
A 70 kg student holds a 2.0 kg mass in each hand and is sitting on a stool that can rotate freely about a vertical axis. With the masses held at arm’s length (0.9 m) the student is set spinning at 1.2 revolutions per second. a. If we approximate the student as a uniform ...
May 8, 2016

math
.4 The probability of two independent events occurring in succession is the product of the two events' independent probabilities. .22 = that product. Because we know the probability of the first being red and the second not being red (.33), we know the probability of the ...
April 25, 2016

algebra
In a theater that will hold 180 people. The cost for each adult is $16 and each student $8. for every two adults there is one student.How many adults and students each will maximize your profit/
April 11, 2016

English
What type of literary device? " At that instant he took a pistol out of his pocket and held the ice cold block at my head"
March 4, 2016

PHYSICS
Yuvi is trying out for the track & field team and wants to give long jump a try. He currently can reach a distance of 5.90 m when leaving the ground at an angle of 30.0°. (a) What is his takeoff speed? (b) If Yuvi could increase his takeoff speed 5.0%, how much further ...
March 2, 2016

Physics
Yuvi is trying out for the track & field team and wants to give long jump a try. He currently can reach a distance of 5.90 m when leaving the ground at an angle of 30.0°. (a) What is his takeoff speed? (b) If Yuvi could increase his takeoff speed 5.0%, how much further ...
March 2, 2016

Math
A world record was set in Eco-Marathon by a french team in 2003 called Microjoule with a performance of 10,705 miles per gallon. The microjoule runs on ethanol. If the cars are given 100 grams of ethanol (specific gravity = .789) and drive until the fuel runs out, how far did ...
February 7, 2016

Finance
What is the value of a building that is expected to generate fixed annual cash flows of 124,250 dollars every year for a certain amount of time if the first annual cash flow is expected in 3 years from today and the last annual cash flow is expected in 9 years from today and ...
February 4, 2016

Algebra
A boat has a speed of 20 mph in still water. While traveling on a river at top speed, it went 40 miles upstream in the same amount of time it went 60 miles downstream. Find the rate of the river current.
January 31, 2016

Math
It takes an older pump 4 times as long to drain a certain pool as it does a newer pump. Working together, it takes the two pumps 4 hours to drain the pool. How long will it take the older pump to drain the pool working alone?
January 31, 2016

msth
My tens digit is 3 more than 5.My tens digit is double the number of my ones digit. What number am I?
January 12, 2016

Physics
A punter drops a .43 kg football from rest vertically 1 meter down onto his foot. The ball leaves his foot with a speed of 18m/s at an angle of 55* above the horizontal. What is the impulse delivered by the foot (magnitude and direction)?
December 2, 2015

Physics
A marble and a cube are placed at the top of a ramp. Starting from rest at the same height, the marble rolls without slipping and the cube slides (no kinetic friction) down the ramp. Determine the ratio of the center-of-mass speed of the cube to the center-of-mass speed of the...
November 8, 2015

math
Ms. Handler walks to work at an average speed of 5 kilometers per hour. If she increases her speed to 6 kilometers per hour, she will save 10 minutes. Find the distance she walks.
October 12, 2015

English
uaaaaaaaaaaaa
August 28, 2015

English
bravery
August 28, 2015

Science
wang
August 20, 2015

physics
light from the sun travels 1.5x10km to reach the earth .how long does it journey take in minutes?
August 9, 2015

Functions
Determine algebraically whether the function f(x)=2x^42x^2 2x+1 is odd, even or neither.
May 13, 2015

Functions
Suppose w=j(h) is the average daily quantity of water (in litres) required by an oak tree of height h metres. If Wa is the quantity of water required by a tree of average height, write an expression for the height of a tree 10 m higher than the average. Show step by step ...
May 13, 2015

Business math
31654.70
April 7, 2015

math
Tall versus Short All tall 787 tall 277 short Smooth versus Wrinkled Seeds All smooth seeds 5,474 smooth 1,850 wrinkled Yellow versus Green Seeds All yellow seeds 6,022 yellow 2,001 green From the table and the theoretical results answer questions 1 and 2. 1) Assume that we ...
April 2, 2015

Physics
james is a dick head. F=ma mg-T=ma (4.5)(9.8)-T=4.5a Torque=I(alpha fish) I=1/2MR^2 TR=1/2MR^2(a/R) 1.5T=(1/2)(2.0)(1.5^2)(a/1.5) T=1a substitute for T 44.1-a=4.5a 44.1=5.5a a=8.02m/s^2 substitute for a T=8.02N
March 23, 2015

Finance
740.28
February 19, 2015

Physical Science
yes
February 17, 2015

Physics
It is the also 1/0.747 or 1.376
February 5, 2015

PHYSICS
2.- A man of 73 kg has a volume of 75 l, of which 5 l correspond to the lungs. (a) Calculate the volume of the lungs when going in apnea underwater to a depth of 10 m, assuming that the density of sea water is 103 kg/m3 . (b) At that depth, will the total forces acting on him ...
December 11, 2014

band
I need to label all my music notes correctly for the guitar and be able to find those notes on the guitar.I also need to tune my guitar with out a tuner.
December 9, 2014

Algebra
Well you see Bob, first you would use the commutative property and change it to some thing like this: (7.8* 800) *10 to the 12th= (7.8*80,000) *10 to the 10th.
November 30, 2014

ph
A coin slides over a frictionless plane and across an xy coordinate system from the origin to a point with xy coordinates (3.0 m, 5.8 m) while a constant force acts on it. The force has magnitude 2.8 N and is directed at a counterclockwise angle of 100° from the positive ...
November 29, 2014

eng
google it
November 27, 2014

eng
what exactly does destiny mean and please don't tell me to google it because everytime i to, i keep getting confused. and also do u believe that destiny plays a role in our lives or no? and why?
November 27, 2014

Physics
Can someone, please help me out with this question. A uniform rectangular 91.21 kg refrigerator with height h = 2.069 m and width w = 1.153 m is pushed at a constant velocity across a level floor. The refrigerator is pushed in the horizontal direction halfway between the floor...
November 6, 2014

physics
If the mass of the skier is 50 kg, what is the magnitude of the force of kinetic friction on the skier? Be sure to show your work, and use g = 10 m/s^2 for the magnitude of acceleration due to gravity. Sin 30degrees = 1/2 Cos 30degrees = square root 3/4 Tan 30degrees = square ...
October 27, 2014

Math
im doing this now HELLLLP
October 15, 2014

Physics
Displacement vector A with arrow points due east and has a magnitude of 2.62 km. Displacement vector B with arrow points due north and has a magnitude of 2.26 km. Displacement vector C with arrow points due west and has a magnitude of 1.4 km. Displacement vector D points due ...
September 12, 2014

Algebra 1
w=10
August 30, 2014

English
Please help is this a good thesis? Students should not be required to wear uniforms in public schools , schools should focus more on education rather than what the student is wearing.
July 23, 2014

Math Finance
Word problem asks to find rate of interest on a monthly deposit for a sinking fund that is needed to produce 130,000 in 20 years. I applied the model, (fv/pv)^1/t -1 I use n/t if compounding yearly, quaterly, etc. No matter what I've tried I can't produce the interest ...
July 3, 2014

physics
a skater is sliding forward on a flat rink at 6 m/s. her mass is 71 kg. the sliding friction acting on her skate blade is 13.4 N acting backward. air resistance is 14.7 N acting backward. what is her horizontal acceleration?
June 15, 2014

Englis
remembered watching it the first time, and realizing I’d never seen anything like it, immediately vowed never to miss an episode of the Daily Show.
June 10, 2014

Geometry
Ann went on a 10 hour bicycle trip. The graph models the relationship between the time and the total distance traveled by Ann. The table shows selected points on the graph. T=0,1,4,7,10 d(t)=0,3,5,5,10 draw a graph of anns speed in mph in terms of the time in hours.
May 27, 2014

geography
5160
May 20, 2014

Math economics HELP!!!
Can someone please help me with a hint to solve this problem?? I'm struggling really hard with this. Thanks!!! "Consider an oligopolistic market with two firms. Each of them produces using a cost function given by c(q)=q^2. The aggregate demand in the market is given ...
March 20, 2014

emily
hit me up
March 19, 2014

Math
Chad buys peanuts in 2 pound bags. He repackages them into bags that hold 5/6 pound of peanuts. How many 2 pound bags of peanuts should Chad buy so that he can fill the 5/6 pound bags without having any peanuts left over?
March 3, 2014

MATH
A landowner wants to fence in a rectangular area of 75000 square metres and divide it into three parts with two parallel fences both parallel to one side of the rectangle. Each part will have a different grazing crop for the herds. What is the shortest total length of fence ...
February 17, 2014

Math
Put in order from least to greatest: 0.748 11/16 76%
January 22, 2014

math
on a scale of 2 inches = 3 feet what is the width ?
January 1, 2014

English
@Mia, for someone who is a story teller, you sure do know how to "spell" hahaha!
November 16, 2013

math iv
When the directions include the words "0 < Theta < 90" what type of problem does that infer?
November 7, 2013

math
Given ABCD with A = (1,1),B = (4, 2), C = (4, 5), and D = (1, 4),what are the coordinates for Point D' if the y-axis is the reflecting line?
August 16, 2013

Math 17 Synthetic Division
Using synthetic division, divide (x^6)(y^6) by x-y. please show the process. THANK YOU! :)
July 9, 2013

Math 17
What is the proof of theorem 2.23, where (b/a)+(d/c)=[(bc)+(ad)]/(ac). Thank you :)
July 1, 2013

math
If a man runs for an hour and a half at 8 miles an hour Due south and then he continues south on a bus traveling 55 miles an hour for 24 minutes how far did you travel
June 5, 2013

Statistics
A study of 420,048 cell phone users found that 135 of them developed cancer of the brain or nervous system. prior to this study of cell phone use the rate of such cancer was found to be 0.0333% for those not using cell phones. Complete parts (a) and (b) a. use the sample data ...
April 30, 2013

Statistics
Use the given data to find the minimum sample size required to estimate a population proportion or percentage. Margin of error: five percentage points; confidence level 90% from a prior study, ^p is estimated by the decimal equivalent 56% n= (Round up to the nearest integer)
April 30, 2013

Statistics
Use the given data to find the minimum sample size required to estimate a population proportion or percentage. Margin of error: 0.06; confidence level 90% ^p and ^q unknown n= (round up to the nearest integer)
April 30, 2013

Statistics
Use the sample data and confidence level to construct the confidence interval estimate of the population proportion p. n=500, x=350, 90% confidence ?<p<? (Round to three decimal places as needed.)
April 30, 2013

Statistics
Assume that a random sample is used to estimate a population proportion p. Find the margin of error E that corresponds to the given statistics and confidence level. 95% confidence the sample size is 2096 of which 25%are successes The margin of E= (round to four decimal places ...
April 30, 2013

Chemistry
How many milliliters water are needed to make a 0.171 M solution that contains 1.00 g of NaCl?
April 11, 2013

Chemistry
Sketch the titration curve for the tirtation of (0.10M) HCl vs 25.0mL (0.50M) NaOH
April 7, 2013

Chemistry
What are the reducing agent and the oxidising agents in the synthesis of ammonia from hydrogen and nitrogen?
March 29, 2013

physics
Starting from rest, a 10.7 kg block slides 2.60 m down to the bottom of a frictionless ramp inclined 30.0° from the floor. The block then slides an additional 4.70 m along the floor before coming to a stop. (a) Determine the speed of the block at the bottom of the ramp. m/...
March 26, 2013

maths
poke fun
March 20, 2013

Physics
Two wires run from the top of a pole 2.6m tall that supports a volleyball net. The two wires are anchored to the ground 2.0m apart, and each is 2.0m from the pole. The tension in each wire is 100N. here are the dimensions. I do not understand how to setup work. if could show I...
March 17, 2013

physics
sorry distances are in meters and tension is in Newtons.
March 17, 2013

physics
Two wires run from the top of a pole 2.6 tall that supports a volleyball net. The two wires are anchored to the ground 2.0 apart, and each is 2.0 from the pole. The tension in each wire is 100. I do not understand how to setup work. if could show I would get better ...
March 17, 2013

dynamics
If it is released from rest at a height of h = 2 ft from the top of the uncompressed spring, determine the speed of the collar after it falls and compresses the spring 0.9ft .
February 24, 2013

Finance
Bond with $1000 par value and a contract interest rate of 10.8%. Bonds current market rate is $1123 and matures in 10 years. Marginal tax rate is 34%. What is the cost of capital from this bond debt?
February 21, 2013

Chemistry- Naming compounds Nomenclature
i am having trouble with this compound. Molybdenum (VI) Chromate I'm have it find its formula and can't seem to get it. Thanks for the help.
February 19, 2013

physics
A car is traveling at 25m/s when an accident occurs. The car decelerates 300m/s^2 but the passenger does not slow down because he is not wearing a seatbelt. a) Supposing the distance between the passenger and the dashboard is initially 0.50m, what will be the speed of the car ...
February 10, 2013

Algebra
Evaluate e^0.1 to four decimal places
February 8, 2013

Chemistry
You're right. My mistake! Thank you...
January 11, 2013

Chemistry
I have this question which I believe I solved correctly, but I was wondering if someone could look it over to make sure? The question is... Assay for Vitamin A (a fat soluble vitamin) required an extraction step into ether. In this assay, 2.00 mL of serum are extracted into 5....
January 11, 2013

chemistry
what is the balanced equation for the reaction of potassium dichromate and potassium hydrogen phthalate?
January 10, 2013

Chemistry
Use the data given below to construct a Born - Haber cycle to determine the electron affinity of Br? DH°(kJ) K(s) → K(g) 89 K(g) → K⁺(g) + e⁻ 419 Br2(l) → 2 Br(g) 193 K(s) + 1/2 Br2(g) → KBr (s) -394 KBr(s) → K⁺(g) + Br⁻...
December 8, 2012

correlation and regression
0
December 4, 2012

calculus
For y(x)=ln(3+x2), find y(6)
November 19, 2012

physics 100
What minimum speed does a 160 puck need to make it to the top of a 5.4 -long, 24 frictionless ramp?
November 14, 2012

Lies
unattractive
November 13, 2012

Physics... Help!
A bullet of mass m=0.060 kg hits a 5.0 kg block with an initial speed of 225 m/s. The block is connected to a spring that is attached to a wall. The friction between the block and the table is negligible. Upon impact, the bullet bounces back from the box with a speed of 75 m/s...
October 28, 2012

ALG 2!!!
10x - 35 = 33 - 18x -12 28x = 56 x = 2
October 28, 2012

Physics--Please Help!!
A bullet of mass m=0.060 kg hits a 5.0 kg block with an initial speed of 225 m/s. The block is connected to a spring that is attached to a wall. The friction between the block and the table is negligible. Upon impact, the bullet bounces back from the box with a speed of 75 m/s...
October 28, 2012

Physics
Also, for part C, do I do KE final minus KE initial? So 1/2(5.06)(75^2) - 1/2(0.06)(225^2) ?
October 27, 2012

Physics
I got 2.67 m/s from your equation. But the correct answer is supposed to be 3.6 m/s.
October 27, 2012

Physics
A bullet of mass m=0.060 kg hits a 5.0 kg block with an initial speed of 225 m/s. The block is connected to a spring that is attached to a wall. The friction between the block and the table is negligible. Upon impact, the bullet bounces back from the box with a speed of 75 m/s...
October 27, 2012

math
kara needs 35 for an aquarium for 6 fish. how can she pay with the least ten and one dollar bills?
October 11, 2012

physics
A 16-kg sled is being pulled along the horizontal snow-covered ground by a horizontal force of 35 N. Starting from rest, the sled attains a speed of 2.1 m/s in 9.5 m. Find the coefficient of kinetic friction between the runners of the sled and the snow.
October 4, 2012

physics
A person pulls a toboggan for a distance of 34.6 m along the snow with a rope directed 29.3 ° above the snow. The tension in the rope is 110 N. (a) How much work is done on the toboggan by the tension force? (b) How much work is done if the same tension is directed ...
October 4, 2012

Statistics
hyu
September 16, 2012

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