Tuesday
May 31, 2016

Posts by Marc

Total # Posts: 159

Scienc
The dissolution of ammonium nitrate in water changes the temperature of water from 21C to - 1C(ice). If the molar enthalpy of ammonium nitrate is 25.7kj/mol. Determine the mass of ammonium nitrate that was dissolved
May 23, 2016

math
what is the circumference of a circle with a diameter of 50 mm
May 21, 2016

Or is this the correct way??
f(3) = 2(9) - 6(3) = 0 f(3+h) = 2(3+h)^2 - 6(3+h) = 2(9 + 6h + h^2 - 18 - 6h = 2h^2 + 6h slope = lim (f(3+h) - f(3) )/h , as h--->0 = lim(2h^2 + 6h - 0)/h = lim h(2h + 6)/h = lim 2h + 6 , as h ---> 0 = 6
April 16, 2016

Calculus (Im I Doing This Right???? Im Unsure)
From first principles (ie using the tangent slope method), find the slope of the following curves at the given value of x. f(x)=2x^2−6x at x = 3 f(x)=2x^2-6x f(x+h)= 2(x+h)^2-6(x+h) =2x^2+4xh+2h^2-6x-6h lim h-->0 f(x+h)-f(x)/h =2x^2+4xh+2h^2-6x-6h - (2x^2-6x) =4xh+2h^...
April 16, 2016

Calculus (Im I Doing This Right???? Im Unsure)
Are you sure? Someone told me I'm doing this wrong
April 15, 2016

Calculus (Im I Doing This Right???? Im Unsure)
From first principles (ie using the tangent slope method), find the slope of the following curves at the given value of x. f(x)=2x^2−6x at x = 3 f(x)=2x^2-6x f(x+h)= 2(x+h)^2-6(x+h) =2x^2+4xh+2h^2-6x-6h lim h-->0 f(x+h)-f(x)/h =2x^2+4xh+2h^2-6x-6h - (2x^2-6x) =4xh+2h^...
April 15, 2016

Calculus
From first principles (ie using the tangent slope method), find the slope of the following curves at the given value of x. f(x)=2x^2− 6x at x = 3
April 14, 2016

Calculus Answer Confirming Not Sure Im Right Help?
would the lim approaches 64 is it 1/48 or is it when the lim approaches 4 is 1/48
April 12, 2016

Calculus Answer Confirming Not Sure Im Right Help?
Ok thanks for the help,it helped a lot!!!
April 12, 2016

Calculus Answer Confirming Not Sure Im Right Help?
* 1/64^2+4(64)+16
April 12, 2016

Calculus Answer Confirming Not Sure Im Right Help?
Evaluate the lim a. lim x--> 64 (cube root x-4/x-64) (∛x-4)/(x-64) -> 0/0 so then let cube root x = u u-4/u^3-64 u-4/u^3-64 = u-4/u-4(u^2+4u+16) the u-4 cancel each other out leaving lim x->64 = 1/u^2+4u+16 1/64^2+4(64)=16 oddly i find the number to large am i ...
April 12, 2016

Confused
Shouldn't i let cube root of x equal u and then factor it out like this u-4/u^3-64
April 12, 2016

Calculus Help Stuck Part 3?
Sorry meant for title to be part 3 not part 2
April 12, 2016

Calculus Help Stuck Part 2?
Evaluate the lim a. lim x--> 64 (cube root x-4/x-64)
April 12, 2016

Calculus Help Stuck Part 2?
so basically to get the negative 1 i just divide -4/4 correct?
April 11, 2016

Calculus Help Stuck Part 2?
Ok thanks that helped a lot!
April 11, 2016

Calculus Help Stuck Part 2?
b.Determine the lim x-->4 (x^2+x-20/8-2x) What Im stuck on is this f(4)= 4^2+4-20 / 8-2(4) f(4)= 0/0 x^2+x-20/8-2x = (x-4)(x+5)/-2(x-4) What do I do next I'm so confused ik i would eliminate the x-4 from numerator and denominator but what would i do with the -2 that ...
April 11, 2016

Calculus
Reiny, want to help on my 2nd question I did the some of the work but I'm stuck on the last step and need guidance
April 11, 2016

Calculus
Determine the following limits if it exists. a. lim x-->5 (4x/x-5)
April 11, 2016

Calculus
Determine the following limits if it exists. a. lim x-->5 (4x/x-5)
April 10, 2016

social studies
The Supreme Court decision in Gray v. Sanders (1963) was instrumental in A) establishing the "one person, one vote" standard for legislative districting. B) overturning the long-standing "separate but equal" standard in education. C) legalizing a woman'...
March 31, 2016

Math
Arrange these numbers from least to greatest: 2 over 5 comma text   end text − 3 over 7 comma text end text 2 over 3. A. 2 over 5 comma text end text − 3 over 7 comma text end text 2 over 3 B. − 3 over 7 comma text end text 2 over 5 comma text end text...
March 14, 2016

English
Fred was talking to his sister one day. He said,-- "Alice, what makes people say, 'Don't give up the ship'?" Alice said, "I don't know. That's what the teacher said to me yesterday when I thought that I could not get my lesson." "...
March 11, 2016

English
How does the author arrange this passage? A) He uses dialogue in the first half to express the confusion over the phrase "Don't give up the ship." He uses a rhyming poem in the second half to explain the phrase's source. B) He uses dialogue in the first half...
March 11, 2016

English
While Sara was traveling in England; she met an interesting old man. . Choose the answer that is the most effective substitute for the underlined part of the sentence. If no substitute is necessary, choose ‘Leave as is.’ A) in England. She met B) in England, she met...
March 11, 2016

English
After the basketball game the students had a dance at the school. . How should the sentence be correctly punctuated? A) Add a comma after game. B) Add a comma after dance. Reactivate C) Change the period to a question mark. Reactivate D) Add an apostrophe before the last s in...
March 11, 2016

English
Choose the sentence that contains no comma errors. A) The book, that I borrowed from Elizabeth last week was excellent. B) About four thousand years ago, Stonehenge, was a center of worship. C) Alice Jones lived at 15, Cedar Street NE, Colorado Springs Colorado, 92158. D) ...
March 11, 2016

Math
Jessica earns $53.35 in 5.5 hours. How much does Jessica earn in 1 hour?
March 8, 2016

Math
1587 x 8000 = 12696000
March 6, 2016

Science
D.
March 3, 2016

Science
Which solution will best allow the movers to achieve their goal? A) Change the width of the ramp from 4 meters to 3 meters. B) Change the length of the ramp from 4 meters to 5 meters. C) Change the height of the ramp from 3 meters to 4 meters. D) Change the length of the ramp...
March 3, 2016

math
.10 so it would be 226.10
February 3, 2016

math
what is 226.08 rounded to the nearest tenth? I'm stuck I believe it would be 226.9
February 3, 2016

math
Um B.
February 1, 2016

math
Two functions, A and B, are described as follows: Function A y = 9x + 4 Function B The rate of change is 3 and the y-intercept is 4. How much more is the rate of change of function A than the rate of change of function B? 2 3 6 9 I believe the answer is either C or B but I am ...
February 1, 2016

Language Arts
Excerpt from: Norse Mythology Part D Kate McConnaughey Then Loki, the spirit of evil, will break loose from the fetters with which the gods have bound him. (31) The frost giants join him. They will try to make a secret attack on the gods. But Heimdall, the sentry of heaven, ...
January 27, 2016

Language Arts
When He-Ping says that he wouldn't miss it for the world, he means that A) he is not sure. Eliminate B) he really wants to go. C) he thinks his mom should know. D) he does not know if he is allowed. I believe it is B.
January 27, 2016

Language Arts
I believe it is A
January 27, 2016

Language Arts
Which words should be deleted to remove redundancy? At first, my initial reaction was to cancel my subscription to the monthly magazine because the customer service representative was so rude to me. A) At first, B) monthly magazine C) my initial reaction D) service ...
January 27, 2016

math
i cant post a picture?
January 26, 2016

math
The lines a and b intersect at point D. What is the value of z? z = Can you please help em solve im really stuck and confused?
January 26, 2016

History
deez nuts
November 7, 2015

Calculus/Math
lim ((1-2x)/(√1+x^2)-1) x→∞ Find the value.
October 6, 2015

Business statistics
ALain<
September 16, 2015

Business statistics
Portia, stop looking for answers to your Monash quiz assignment. Do it yourself!!LOL Alian is gonna eat your ass
September 16, 2015

algebra
Shoe O Rama is having a 20 % off sale this friday. Which equation below shows how to find the sale price, s, as a function of the original price, p?
June 18, 2015

Algebra
The difference of two whole numbers is 27.The greater number is 3 less than twice the smaller.What are the numbers?
April 1, 2015

Math
Please help me and show an understanding please, so I see how to figure them out. Lee deposited $28,000 in an interest-bearing checking account that earns 3.5% interest compounded daily. Find the amount after 68 days. a.$183.16 b.$28,180.46 c.$28,183.16 d.$180.46 On April 10th...
February 20, 2015

algebra
on an expressway, the recommended safe distance between cars in feet is given by 0.019v^2+v+14, where v is the speed of the car in miles per hour. Find the safe distance when the following takes place( round answer to three decimal places). v=35 mph ____ft.? and v=55mph ...
September 27, 2014

algebra
The vendor of a coffee cart mixes coffee beans that cost $8 per pound with coffee beans that cost $4 per pound. How many pounds of each sould be used to make a 60-pound blend that sells for $5.25 per pound? $8 coffee __________ $4 coffee __________
September 27, 2014

algebra
on an expressway, the recommended safe distance between cars in feet is given by 0.019v^2+v+14, where v is the speed of the car in miles per hour. Find the safe distance when the following takes place( round answer to three decimal places). v=35 mph ____ft.? and v=55mph _____ft.?
September 27, 2014

geometry
v=1/3TTr^2h;
September 11, 2014

algebra
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
v=1/3ttr^2h; h(geometry)
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
if a pie is cut into sixths how many pieces would there be ?
September 2, 2014

statistics
The trends in international mathematic and science study (TIMSS) in 2007 examined eighth grade proficiency in math and science. The mean mathematics scale score for the sample of eighth grade students in the US was 508.5 with a standard error of 2.83. Construct a 95% ...
August 2, 2014

Algebra
Solve h=2f/m+1
May 14, 2014

english
two independent clauses
March 25, 2014

pharmacy tech
to find out if a drug causes nausea you would look in this section of the drug monograph
March 19, 2014

math
Three men, A, B and C agree to share the expense of a fishing expedition in the ratio 2:3:4. A pays $25 for the hire of the boat, B pays $70 for the meal and C pays $49 for traveling expenses. How much must A and C pay B to settle their agreed shares?
March 15, 2014

math
Two numbers are such that their difference, their sum, and their product are in the ratio 1 : 4 : 15. What are the two numbers?
March 15, 2014

geometry
/?gfe_rd=cr&ei=ybIvU7KZAcaE8QfLzYDoDQ
March 6, 2014

math
let time taken until they meet be t hrs distance covered by first train = 115t miles distance covered by 2nd train = 105t miles 115t+ 105t = 1200 220t = 1200 t = 5.454545.. hrs or 5hrs and .4545..*60 min = 5hrs and appr 27 minutes
February 7, 2014

PHYSICS
An electron is initially at rest in, but not on the axis of, a solenoid that is carrying a steady current I directed as shown in the cross section below. The electron is initially at rest on the -x axis. The current in the solenoid is suddenly increaed to 2I. In what direction...
December 15, 2013

PHYSICS
its A
December 14, 2013

Physics
0.001 V
December 12, 2013

math
calculate the following, leaving your answer either as a fraction (lowest) or in decimal form Divide: 3/4 ÷ 3 =
September 17, 2013

math
calculate the following, leaving your answer either as a fraction (lowest) or in decimal form Multiply: (2/3) (3/5) =
September 17, 2013

math
calculate the following, leaving your answer either as a fraction (lowest) or in decimal form Subtract: 3/4 - 3/8 =
September 17, 2013

math
calculate the following, leaving your answer either as a fraction (lowest) or in decimal form Add: 3/8 + 1/2 + 3/4+=
September 17, 2013

Mechanics:Statics
Two 10 kg spheres are placed 500mm apart. Express the gravitational attraction acting on one of the spheres as a percentage to its weight on earth.
April 19, 2013

Mechanics:Statics
A man weighs 900N on the surface of the earth. Compare his weight in an airplane flying at an elevation of 9000m. Note that the radius of Earth is 6378km.
April 19, 2013

8th grade science
Good hypothesis for does the human tongue have definite areas for certain tastes
February 3, 2013

science
Does the human tongue have definite areas for certain tastes
February 3, 2013

math
First estimate,then multiply to get the exact answer. 6 2/3 X 3 4/11 X 5
December 18, 2012

Physics
An 80 kg man climbs a 50 m-high hill in 20 minutes. What is the average power in watts he expends climbing the hill?
November 20, 2012

Physics
The weight of a rock on the moon is 0.85 N. If acceleration due to gravity on the moon is 1.7 m/s2, what will be its weight on the earth
November 10, 2012

science
make a graphic organizer to show ways how ways to cause physical changes to a piece of paper
October 2, 2012

math
there are 45 children in a class.if there are 3 more girls than boys,how many are girls?
September 4, 2012

math
i am a three digit number.if you subtract 419 from me the remainder is 126.what number am i?
September 4, 2012

math
there are 45 children in a class.if there are 3 more girls than boys,how many are girls?
September 4, 2012

Statistics
The annual precipitation for one city is normally distributed with a mean of 72 inches and a standard deviation of 3.5 inches. In 95% of the years, the precipitation in this city is between___ and ___
July 23, 2012

chemistry
simply put, (0.75 C/s)(time)(1 mole e-/96485 C)(1 mole Cu/2 mole e-) = (0.10825-0.04175) time = 17,110.07 s = 4.7527 hr
June 18, 2012

chemistry
my answer is 4.7527 hr. it is solved by this format: time = [(0.10825-0.04175)/((0.75)(1/96485)(1/2))]/[3600] time = 4.7527 hr Note: for the dimensional analysis, (mol)/(C/s)(mol/C)=s (divide by 3600 to convert to 1 hr) hope it helps.
June 18, 2012

english
. Your topic is courtesy, and you're writing from the point of view of a caring mentor. Which of the following sentences is most persuasive for an audience of high school graduates from a working-class neighborhood? A. Courtesy to others shows self-respect as much as it ...
May 10, 2012

physics
I meant 3.86*10^-6 N
April 28, 2012

physics
A mass of 710 kg is located at the origin. A second mass, 44.0 kg, is located at the point (0.216,0.702) m. Find the magnitude of the gravitational force on the 44.0 kg mass due to the 710 kg mass at the origin. I got: 3.86×10-6 N Enter the x and y components of the ...
April 28, 2012

physics
Please decide which of the following statements for car collisions are true or false. 1)Crumple zones on cars are parts of the front of the car that are designed to receive maximum deformation during a head-on collision. The essential safety benefit of crumple zones results ...
April 11, 2012

physics
A bullet of mass m = 5.89 g is fired into a block of mass M = 3.09 kg that is initially at rest on the edge of a smooth table. (The table top is 0.83 m above the floor.) The bullet ends up stuck in the block, and together they fly off the table and fall to the floor. If the ...
April 8, 2012

Physics
Wheel A of radius ra = 13.9 cm is coupled by belt B to wheel C of radius rc = 34.3 cm. Wheel A increases its angular speed from rest at time t = 0 s at a uniform rate of 5.7 rad/s2. At what time will wheel C reach a rotational speed of 168.2 rev/min, assuming the belt does not...
February 10, 2012

Physics?
ok..so for c: v = w*r = 168.2*0.343m =57.6926 and therefore for a: w = v/r = 57.6926/0.139m = 415.055 is that correct? and for the acceleration: for a: a= 5.7*0.139 = 0.7923 and for c: 0.7923/0.343 = 2.3099 but how do I get time ??
February 10, 2012

Physics
Wheel A of radius ra = 13.9 cm is coupled by belt B to wheel C of radius rc = 34.3 cm. Wheel A increases its angular speed from rest at time t = 0 s at a uniform rate of 5.7 rad/s2. At what time will wheel C reach a rotational speed of 168.2 rev/min, assuming the belt does not...
February 10, 2012

math
ok
February 2, 2012

math
i do not get this question 24 / x = 4
February 2, 2012

English 7 - Journal Entry Check
instead of "in" use on for this sentence
February 2, 2012

English 7 - Journal Entry Check
between hard and i for this sentence"I worked really hard. I was" should be a comma also with this sentence"A few weeks later the" a comma should be between later and the
February 2, 2012

physics
A 0.58 kg football is thrown with a velocity of 15 m/s to the right. A stationary receiver catches the ball and brings it to rest in 0.017 s. What is the force exerted on the receiver? Answer in units of N
January 30, 2012

statistics
Among the four northwestern states, Washington has 51% of the total population, Oregon has 30%, Idaho has 11%, and Montana has 8%. A market researcher selects a sample of 1000 subjects, with 450 in Washington, 340 in Oregon, 150 in Idaho, and 60 in Montana. At the 0.05 ...
December 2, 2011

PSYCHOLOGY HELP PLEASE!!
The answer is (D), "We have met them on previous occasions."
December 1, 2011

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