Friday
February 27, 2015

Posts by Jack


Total # Posts: 1,382

Calculus
1) you find y' (dy/dx) (f'(x)) 2) replace each x by a which equal to one f(x) = (x+1)^1/2 f'(x) = 1/2 (x+1)^-1/2 (1) f'(x) = 1 / 2(x+1) f'(0) = 1/ 2(0+1) = 1/2 = 0.5
February 14, 2012

algebra
i think you mean x^2 - 7x - 8 = (x-8)(x+1)
February 12, 2012

Calculus (Antiderivatives)
((x-2)(x+2) / (x-2) ] / (x-2) int x+2 = 1/2 x^2 + 2x + c
February 10, 2012

Calculus
f'(x) = 6x - 5 / 2 sqrt(3x^2-5x+7) f'(2) = 12 - 5 / 2 sqrt ( 12-10+7) = 7 / 2 sqrt (9) = 7/ 2*3 = 7/6 = 1.16666
February 10, 2012

math
The plane is at least 500 miles closer to chicago than to denver
February 10, 2012

Mathematics
It's still really confusing. >o< My type of problems: **8x(squared)/35y(squared)/x(squared)+4x+3/x(squared)-1 **4a(squared)/ab/a(squared)-5a+6/a(squared)-2a **1+1/a / 1-1/a
February 9, 2012

Mathematics
Can someone explain to me how to solve complex fractions as if I didn't know anything about Algebra? I really need the help, thanks. :) It's not like this is the question of my homework, I just don't understand how to solve complex fractions from the start . . .
February 9, 2012

Calculus
Find dy/dx for f(x)= (1+x)^(1/x)
February 8, 2012

Calculus
Find dy/dx for (e^xy)+ x^2 +y^2=10
February 8, 2012

Calculus
Find the inflection points of f(x)=(x^2-6x-5)e^x
February 8, 2012

Calculus
Integrate from e^2 to e of tthis funtion: 1/(x)ln(x) dx
February 8, 2012

Calculus
Find integral of (x^3-6x-20)/(x+5) dx
February 8, 2012

Calculus
Find the relative extrema of f(x)= x/ln(x)
February 8, 2012

Calculus
The rate at which iPads are sold is R(t)=1000000x2.8^t where the units of R(t) are millions/year and represents time in years such that the year 2010 (Jan 1 2010 through Dec 31 2010) corresponds to t=0. How many iPads will be sold in the three year period Jan 1, 2012 through ...
February 8, 2012

math
it takes a skier 30 seconds to ski down the 1st mountain to the second mountain that is 40 feet above ground. it takes the skier 6 seconds per foot to slide down. how many feet above ground is the 1st mountain?
February 5, 2012

statistics
.096
February 4, 2012

math
The sum of two numbers is 10.The sum of their squares is 52.Find the numbers.
February 2, 2012

Math
Find two consecutive positive integers such that the square of the smaller increased by 4 times the larger is 64.
February 2, 2012

french
can anyone unscramble the letters please.... rtepasn, ipocne, liflmae
January 30, 2012

math problem solving
Alana has 7 children and brought a $9.95 shirt for each of them. The cashier charged her an additional $13.07 in sales tax. She left the store with $7.28. How much money did Alana start with?
January 27, 2012

maths
the perimeter of a rectangle is 12 c.m and its length is 4 c.m . what is its width? and the area?
January 20, 2012

maths
the area of a rectangle is 12 square c.m and its length is 4 c.m what is its width?
January 20, 2012

maths
what is the area of a rectangle of length 6 c.m and width 3 c.m ? what is its perimeter/
January 20, 2012

maths
a owns a rectangularers compound of length 40 meters and width 25 meters what is the area of this compound in ares
January 20, 2012

Math
Evaluate the given indefinite integrals. ∫ (x+2)(2x+3)^1/2
January 14, 2012

math
I used a program to draw a circle inside a triangle using height = 3 radius and it was fit !
January 13, 2012

math
Prove that the least height (h) of a triangle contains a circle of radius (r) is h=3r
January 13, 2012

Math
How do you solve 2(15a-3)=10a-46
January 11, 2012

math
a * b = 30 .....1 a - b = 7 ..... 2 a = 7 + b ......3 (7+b)(b)=30 b^2+7b-30=0 (using quadratic formula) b = -10 or b = 3 a = -3 or a = 10
January 10, 2012

Thermodynamics
Determine the units of viscosity,m, in the following equation: t=m(du/dy), where t is a shear stress, u a velocity, and y is a distance in (a) the Engineering English system, and (b) the SI system.
January 4, 2012

UOP
o test the hypothesis that students who finish an exam first get better grades, Professor Hardtack kept track of the order in which papers were handed in. The first 25 papers showed a mean score of 77.1 with a standard deviation of 19.6, while the last 24 papers handed in ...
December 19, 2011

PHYSICAL SCIENCE PLEASE HELP REALLY APPRECIATE IT!
ME
December 14, 2011

math
Hi would you please show how to know if the function is differentiable or not ? please show me the answer with examples
December 13, 2011

math
Hi I Have A Question About Rolle's Theorem Why We cant solve [ F(x) = abs(x) ] ? *abs = absolute
December 10, 2011

Finance
A court has ordered Security Enterprises to pay 200000 in two years and 500000 in five years. In order to meet this important liability, they wish to invest in a combination of two-year 10% par-value bonds with annual coupons and five-year zero-coupon bonds. Each of these is ...
December 4, 2011

geometry
1. a 2. d 3. d 4. b 5. d The final score is 5/5 (100%). I know it is correct because I got them all right. I hope that helps. :)
December 3, 2011

Math
thanks
December 1, 2011

Math
Find the equation of the diameter of the circle x^2+y^2-6x+2y=15, which, when produced, passes through the point (8,-2).
December 1, 2011

chemistry
An analytical chemist determines that an unknown sample contains 0.3452 mol of LiCl. How many atoms of chlorine does this sample contain?
December 1, 2011

maths
2 over 5 plus 1 over 8 equals blank plus blank equals
November 30, 2011

Maths
x^3+a^3 Factor= (x-a) what is the remaninder when you divide x^3+a^3 by (x-a)? Please show me your working out
November 25, 2011

physics
The hero pursues the villain up to the top of a bungee jumping apparatus. The villain appears trapped but to create a diversion she drops a bottle. The hero quickly straps on the bungee cord to his leg and dives straight down to grab the bottle while its still in the air. ...
November 18, 2011

algebra
Find the x-intecepts, for the graph of the equation: y=x^2+4x-5
November 9, 2011

math
what is the unit rate for $3 for 4lbs.
November 8, 2011

physics
2.5
November 8, 2011

Math
Suppose $1.00 amounts to 1.082431 at 8 % compounded quarterly. How much does $200 amount to? (a) $ 126.82 (b) $ 101.46 (c) $ 216.49 (d) $ 380.47 (e) $ 250.00
November 3, 2011

Chemistry
Ethanol (C2H5OH) is synthesized for industrial use by the following reaction, carried out at very high pressure. C2H4(g) + H2O(g) C2H5OH(l) What is the maximum amount of ethanol (in grams) that can be produced when 1.0 kg of ethylene (C2H4) and 0.014 kg of steam are placed ...
November 1, 2011

math
Kayla has 5 quarters, 3dimes,2 nickles and 5 pennies. How many different combonations of coins can she make to have 0.50?
October 27, 2011

pre algebra with pizzazz 239
Idk
October 27, 2011

Physics
Once a 15 kg crate is in motion on a horizontal floor, a horizontal force of 51 N keeps the crate moving with a constant velocity. The acceleration of gravity is 9.81 m/s What is µk, the coefficient of kinetic friction, between the crate and the floor?
October 25, 2011

physics
In 1976, the Lockhead SR-17A Blackbird set the record speed for any airplane: 3.53x10^3 km/h. suppose you observe this plane ascending at this speed. For 20.0s, it flies at an angloe of 15.0 degrees above the horizontal, then for another 10.0s its angle of acsent is increased ...
October 25, 2011

History Please Please
thank you very much for your help.
October 23, 2011

History Please Please
Could you please explain to me: how was the structure (Collosus of Rhodes) effective for it's stated purpose? I don't understand the question and I need something for my project. Pleaseee.
October 23, 2011

Physics
The Earth's rate of rotation is constantly decreasing, causing the day to increase in duration. In the year 2006 the Earth took about .840 s longer to complete 365 revolutions than it did in the year 1906. What was the average acceleration of the Earth during this time? ...
October 23, 2011

physicsURGENT
An 85 cm long pendulum with a 0.80 kg bob is released from rest at an initial angle of θ0 with the vertical. At the bottom of the swing, the speed of the bob is 2.8 m/s. What angle does the pendulum make with the vertical when the speed of the bob is 1.4 m/s?
October 23, 2011

math
A set of 100 open lockers are numbered from 1 - 100. Sarah comes by and closes all the lockers with even numbers. Then Sarah walks past the lockers again and checks the ones numbered with multiples of 3. If the locker is closed, she opens it; if it is open, she closes it. She ...
October 23, 2011

History
Colossus of Rhodes: Was the structure effective for its' stated purpose?
October 22, 2011

Math
thank you very much
October 20, 2011

Math
A computer game starts with a set of 144 tiles separated into 36 equal groups.Sara played the game until there were 8 groups of tiles left.How many tiles were left when Sara finished? How do you get 32 tiles?Can you please explain?Thanks
October 20, 2011

Math
240 / 6= 40 in both teams. So I don't know how to explain this problem to the teacher because I have to justify my answer. Please help me. Thanks
October 20, 2011

Math
A computer game starts with a set of 144 tiles separated into 36 equal groups.Sara played the game until there were 8 groups of tiles left.How many tiles were left when Sara finished?
October 20, 2011

math
I Wanted To Find The Square Root Of (1-2i) But I Didn't Know How To Solve It. My Solution : x+yi = sqr(1-2i) x2-y2+2xyi = 1- 2i x2-y2 = 1 2xy = -2 y = - 1/x x2 - (-1/x) = 1 ] * x2 x4-x2-1 = 0 How To Evaluated (x4-x2-1) ? I Tried To Sol
October 16, 2011

Calculus
thanks Damon, in HS and this is kicking my butt!
October 14, 2011

Calculus
equation of tangent line of the function sqrt (3x+5) where x=10
October 14, 2011

calculus
A trough is 16 ft long and its ends have the shape of isosceles triangles that are 5 ft across at the top and have a height of 1 ft. If the trough is being filled with water at a rate of 11 ft3/min, how fast is the water level rising when the water is 7 inches deep?
October 13, 2011

Math
I Don't Know What Is This Subject Called In English But It's About Complex Numbers it says 25 = 16 - 9 i^2 = (4 ± 3i) But My Teacher Says 25 = 25 - 0 i^2 = (5 ± 0i) I Think My Teacher Is Wrong , The Result Is 25 But There Will Not Be Complex Number ...
October 5, 2011

Calculus
yeah that's what I meant
October 4, 2011

Calculus
If f(x)=[x−1/(1+5 x)], there are two points on the graph of y=f(x) at which the tangent lines are parallel to the line x−2y=2. Type in the x values of these points. Type the smaller number first, then the larger number.
October 4, 2011

U.S HISTORY
thanks but i still didnt find the answer
September 28, 2011

U.S HISTORY
What was Benjamin franklins reaction to the colonies refusal to accept the Albany plan of union?
September 28, 2011

U.S HISTORY
then do it
September 28, 2011

U.S HISTORY
LIST TWO REASONS THE FRENCH FELT THREATENED BY BRITISH INTEREST IN THE OHIO RIVER VALLEY?
September 28, 2011

U.S HISTORY
THANKS, SO WHAT IS THE ANSWER. I REALLY NEED IT NOW FOR MY HOMEWORK :)
September 28, 2011

U.S HISTORY
WHY DID COLONISTS CONSIDER GEORGE WASHINGTON A HERO, EVEN AFTER HE WAS DEFEATED BY THE FRENCH? PLEASE ANSWER IT THANKS JACK
September 28, 2011

islamic studies
it was actually my friend that asked the question not me so i put his name
September 28, 2011

islamic studies
THANKS FOR HELPING ME.
September 28, 2011

math
is 0 a multiple of every number?
September 26, 2011

Math PLEASE HELP
what is the sequence for fibbinachi higher than 1,000,000?
September 26, 2011

algebra
#1 I would do (11*0.6)+(11*5) #2 (3*0.4)+(3*0.5) Figure out the rest!
September 26, 2011

Chemistry
1. Molarity is to moles of solute over liters of solution as molality is to A. molar concentration over molal concentration. B. moles of solute over kilograms of solvent. C. molal concentration over molar concentration. D. moles of solute over moles of solvent. 2. In ...
September 26, 2011

English
what is the rhetorical strategy used in this parapgraph and what is the effect/function. Please quote the sentence of where the rhetorical strategy is used. Paragraph: But for the rest of us, the sovereign freedom of traveling comes from the fact that it whirls you around and ...
September 25, 2011

chemistry
Please explain me which solution reacts faster to breakdown the materials the 25% or 10% HCL?
September 25, 2011

statistics
what sampling technique is used if a quality-control inspector selected every 20th DVD player as it came off an assembly line
September 25, 2011

Chemistry
1. Molarity is to moles of solute over liters of solution as molality is to A. molar concentration over molal concentration. B. moles of solute over kilograms of solvent. C. molal concentration over molar concentration. D. moles of solute over moles of solvent. 2. In ...
September 23, 2011

math
What Is The Integration Of (0)?
September 22, 2011

chemistry
Consider the following unbalanced reaction: Fe2O3 (s) + CO (g) --> Fe (s) + CO2 (g) How many moles of carbon dioxide are produced per mole of iron (III) oxide reacted.
September 20, 2011

Physics
A particle travels to the right at a constant rate of 6.8 m/s. It suddenly is given a vertical acceleration of 1.8 m/s2 for 5 s. What is its direction of travel after the acceleration with respect to the horizontal? Answer between −180◦ and +180◦ and What is ...
September 18, 2011

physics
A compact disc spins at 2.3 revolutions per second. An ant is walking on the CD and finds that it just begins to slide off the CD when it reaches a point 3.5 cm from the CD's center. What is the coefficient of friction between the ant and the CD?
September 16, 2011

Networking
.032%
September 13, 2011

phy
regarding #5: That answer would be correct if both balls were thrown at the same time. The problem states the red ball was thrown downward 2.6 seconds after the blue ball was thrown. One solution is to determine the position and velocity of the blue ball at the time the red ...
September 13, 2011

physics
Convert 25 meters to centimeters and gigameters.
September 12, 2011

Physics
Convert 25 meters to centimeters and gigameters.
September 12, 2011

Physics
Convert 25 meters to centimeters and gigameters.
September 12, 2011

chemistry
how do you calculate density of a substance with a mass of 100g and a volume of 48ml
September 11, 2011

maths
What are the steps to solve it? lim (x^2+y^2)/(sqrt(x^2+y^2+36)-6) as (x,y) approaches (0,0)
September 10, 2011

physics
A canoe has velocity of 0.40m/s southwest relative to earth.the canoe is on a river that is flowing 0.50m/s east relative to earth find the velocity (magnitude and direction) of the canoe relative to the river.
September 10, 2011

physics
plz anyway help me for the solution of this question. from the top of a tower P,a ball is thrown vertically upwards.when the ball reaches a distance h below P,its speed is double of what it was at height h above P.show that the greatest height attained by the ball above P is ...
September 10, 2011

physics
a roller whose diamater is 1.0m.weight 360N.what horizontal force is necessary to pull the roller over a brick 0.1m,heigh when the force is applied at the centre?
September 10, 2011

Math
place decimal points in 190563 and 865 so that their difference is 181.913
September 7, 2011

PreCal
Find the distance between P1(3, –195°) and P2(–4, –94°) on the polar plane. Round your answer to the nearest thousandth.
September 5, 2011

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