Saturday
August 2, 2014

Posts by tom


Total # Posts: 1,049

calculus 2
thanks steve!

calculus 2
integrate e^(2x) / (e^(4x) + 9) am I allowed to simplify the e^(2x) with the e^(4x)? Thank you

I need help
this is the Answer jiskha try it

I need help
1:compare and contrast 2:Taxies represent the modern world 3:things that we might not value until it’s too late 4:Nicole and Camille left work, went to the gym, and ate dinner before 7 p.m. 5:intercontinental

trig sub question
thank you Steve

trig sub question
Hello, I have a question concerning trigonometric substitution. let's say we have integral of dx/sqrt(9x^2 + 4), so after doing a few steps we have: 2/3 integral of sec0/sqrt((2tan0)^2 + 4*) d0 (the * is for later on) the next step turns into: 2/3 integral of sec0/(sqrt(4t...

Math
it was not negative that was a subtraction sign

Math
so lets say i had 4w-8-1w i take 4w+1w= 5w then i have -8 left and i do 5w-8

Math
help me combine like terms. like how do you do it with different signs in the problem. 17 + 4w - 12 - w

marketing
what is market segmentation

math
If the digits of a number may be any one of 0 through 9 (except the first digit cannot be zero), and the system of alternating signs of coefficients is used to create a polynomial, what is the least number m of real zeros the polynomial can have? What is the greatest number M ...

math
A box with an open top is to be constructed from a rectangular piece of cardboard with dimensions W inches by L inches by cutting out equal squares of side x at each corner and then folding up the sides. (W = 12 in. and L = 20 in). Find the values of x for which the volume is ...

math
I am a 2-digit number with a 1-digit decimal. I am bigger than 54 but smaller than 56. 2 of my digits are even. When you divide my whole number by the digit in my decimal place, the answer has no remainder. What are the biggest and smallest numbers I could be?

Calculus 2
thanks!

Calculus 2
I have this integral that I don't know how to solve: ∫ (x-3)/sqrt(x) Would I multiply both parentheses first? or just turn it into (x-3)(x^-0.5)?

calculus
okay so there must be a mistake with the system, thanks for clearing that up Damon.

calculus
Using an upper-case "C" for any arbitrary constants, find the general indefinite integral ∫ (-2-t)(-9-t^2) dt Now I multiplied both parentheses to get: ∫ (18 + 2t^2 + 9t + t^3) dt now I integrated and got: 18t + 2t^3/3 + 9t^2/2 + t^4/4 + C but I'm tol...

Math
2x-5=39 2x=39-5 2x=34 x=17

math
come on i waitied almost for 20 minutes and this is what i get. -_- not cool

math
A park ranger finds that 35% of the park visitors stay at the campground. Of 105 visitors stayed at the campground in one day, how many visitors did the park have that day? i got 36.75 people and then i rounded and got 37 people.

calculus
Thank Steve. But how do you get 60 or 70? or the -1?

calculus
it's integral, not interal, sorry for the mistake

calculus
find the derivative of: g(x) = interal(a=7x, b=6x) (u+5)/(u-5) du Hint: interal(a=7x, b=6x) (u+5)/(u-5) du = interal(a=0, b=6x) (u+5)/(u-5) du + interal(a=7x, b=0) (u+5)/(u-5) du

math
EXPLAIN HOW YOU CAN BREAK 6X7 ARRAY IN TO SMALLER ARRAYS .WHAT ARE THE NEW FACTS?

Physics
pickett!!!

math
If a farm as 13 heads and 36 feet. How many chicken are there and how many rabbit are there?

math
If a farm as 13 heads and 36 feet. How many chicken are there and how many rabbit are there?

physics
nevermind, got it, had to switch calculator from degrees to radian, hehe

physics
The displacement of a particle in centimeters is given by y=8 sin (2πft). If f=20 Hz, find the displacement and the velocity of the particle at a time t=0.01 s and 0.07 s. (ans: y=7.61 cm, v=3.11 m/s, y=4.70 cm, v= -8.13 m/s) After I plug in f to get w and switch to this ...

ANSWER MY QUESTION
IS AN ATOM AN ELEMENT

chemistry
is a element an atom?

math help
340-127=213pages in the morning before the afternoon 253-213=40pages read in the afternoon

Physics
Suppose you have a very long straw that can reach from a cup of water on the ground level to the top of a very tall building. When you use a pump to suck on the straw in order to bring water up, a. you can bring the water up to any height with no problem. b. you can bring the ...

Pre-Algebra
3.25 for one batch of cookie 16.5/3.25= ___ batches of cookies

math
x=5 6x5=30+4=34

science
nvm i see it

science
Au-gold ag-sliver sn-tin hg-mercury pb-lead k-potassium w-tungsten fe-iron that's not what i meant. what does each abrevation mean in latin? the orgin name?

science
What are the orgin names for these abbreviation? in latin Au-gold ag-sliver sn-tin hg-mercury pb-lead k-potassium w-tungsten fe-tron

Physics
I should indeed have formulated this a lot clearer. I have done an experiment in which I add a stationary point to the standard pendulum situation, which creates a period function dependent on both the length of the pendulum as on the height of the stationary point which limit...

Physics
Hello everyone, I have made measurements of the periods of a pendulum attached to a stationary point at a certain height h. When plotting the periods as a function of the square root of the length minus the height it gives us a straight line. I now need to prove that this line...

Chemistry
How many joules ar required to heat a frozen can of juice (360 grams) from -5 degrees C (the temp of an overcooled refrigerator) to 110 degrees C (the highest practical temp within a microwave oven)?

math
A video rental store has 1,234 videos on the shelves. OF the videos 1/3 were rated PG and 1/2 were rated PG-13. What equation can be used to find v, the total number of PG and PG 13 videos in the store?

math
if A [] B = A^B-(A+B), 7 [] 9 = ?

maths
Express sin 2x cos 4x as a sum of trigonometric functions

maths stats
For each day of the 5-day working week Tom can choose any one of 6 newspapers to read at the lunchtime. (i) How many different choices are possible in a week? (ii) If Tom wants to read a different title each day, then how many different choices are possible in a week?

Physics
Amy age 8 27kg 127cm Bruce age 12 41kg 149cm Both Amy and Bruce are learning gymnastics and having trouble being able to get enough height and time in the air to do a back somersault without the coach spotting them. The coach gives them homework to just focus on jumping straig...

math problem
To make an orange dye, 4 parts of red dye are mixed with 3 parts of yellow dye. To make a green dye, 2 parts of blue dye are mixed with 1 part of yellow dye. If equal amounts of green dye and orange dye are mixed,___________ of this mixture is composed of yellow dye.

math
According to the statistics of a famous high school in Canada, all their graduates went to either A or B for university study. Following are the proportions of graduates who went to the two universities. University Proportion A 1-k B k Suppose k = 0.4 (a) What is the standard ...

Alegbra 1
Mr. Jones got his car washed at super clean. The wash started at 1:55pm and ended at 2:05pm. It cost $7. Mr. Smith got his car washed at Super Clean for $12. the wash started at 9:30am and ended at 9:50 am. Write an equation for the line that represents this situation. Part 2:...

programming
There are several types of room in a hotel. The HotelRoom Class of Previous Programming Problem was not specific regarding the type of room. Assume that a hotel has guest rooms and meeting rooms. Modify the HotelRoom class as follows: remove the capacity and status instance va...

Physics
A 2.50 kg wheel has a diameter of 20.0 cm and is rotating at 3600 rpm. A force acts on it causing it to come to a rest in 10.0 seconds. What is the magnitude of the force?

Chemistry
No problem :)

Chemistry
For the online course, 1)b and 2)c

eng
is the sentence: "By using a statement that began with 'I,' Ramon was able to state his feelings clearly." a simple sentence or a complex sentence?

Physics HELP!
The position of an object connected to a spring varies with time according to the expression x = (7.1 cm) sin (2.1π t). Find (a) the period of this motion (b) the frequency of the motion (c) the amplitude of the motion (d) the first time after t=0 that the object reaches ...

math
a mystery number is bigger than 50 and larger than 100. you can make exactly five different rectangles with the mystery number of tiles. its prime factorization consists of only one prime number. what is the number

math
a mystery number is bigger than 50 and larger than 100. you can make exactly five different rectangles with the mystery number of tiles. its prime factorization consists of only one prime number. what is the number

Physics
The boom of a crane is 20 m long and is inclined 20ᵒ from the horizontal. A bucket of cement with a mass of 3000 kg is suspended from the upper end of the boom. What is the torque acting on the point where the boom is attached to the crane? A. 5.5 x 105 Nm. B. 3.5 x 105 ...

psychometric test
Hi i have been given an experiment paper on personality, in this we have to come up with an updated version of Eysencks (EPI) questionnaire. This is to measure extroversion only ,we are measuring concurrent validity. Im having difficult in answering the co varibles which is my...

Algebra
help me solve this equation by substitution. y^2− 4x^2 = 7 9y^2+16x^2 = 323

chemistry
ryeng i suppose? this is a very easy question 392.4*10-10= x cm xcm^3= ycm^3 ycm^3* 21.09= mass in grams since face centered unit cell has 4 atoms mass/4, then use the product of that to divide by 1.66*10^-24 = amu your result should be 191.84 amu

Chemistry
How do I change 3,3,4,4,5,5-hexamethyl-1-hexyne into it's molecular formula

physics
the coefficients of static and kinetic friction for stone on wood are, respectively, 0.5 and 0.4. if a 150 kg stone statue is pushed with just enough force to start moving across a wooden floor and the same force continues to act afterward. find the statue’s acceleration.

Calc 2
Use Taylor’s Estimate to bound the error of the n-th order Maclaurin approximation of sin(a), where a 2 [��; ].

home economics
a firm produces 20 units of output at a market price of #5, a marginal cost of $5, and an average cost of $3. what is the firms economic profit and is the firm maiximizing its economic profit. Is the formula market price-average cost x quantity 20?

physics
For a glass lens submerged in water (n=1.33), the critical angle of incidence at which total internal reflection begins to happen is 60.1 degrees. What is the index of refraction of the glass?

physics
A 67.5 kg hoop rolls along a horizontal floor so that its center of mass has a speed of 0.090 m/s. How much work must be done to stop it?

physics
What force must be applied to push a carton weighing 350 N up a 19° incline, if the coefficient of kinetic friction is 0.45? Assume the force is applied parallel to the incline and the velocity is constant. (Enter the magnitude of the force.)

physics
What force must be applied to push a carton weighing 350 N up a 19° incline, if the coefficient of kinetic friction is 0.45? Assume the force is applied parallel to the incline and the velocity is constant. (Enter the magnitude of the force.)

physics
What force must be applied to push a carton weighing 350 N up a 19° incline, if the coefficient of kinetic friction is 0.45? Assume the force is applied parallel to the incline and the velocity is constant. (Enter the magnitude of the force.)

Physics- Elena please help!!!!
A centrifuge in a medical laboratory rotates at an angular speed of 3500 rev/ min. When switched off, it rotates through 41.0 revolutions before coming to rest. (a) Find the angular speed in rad/s. (b) Find the displacement in radians. (c) Find the constant angular acceleratio...

physics
What force must be applied to push a carton weighing 350 N up a 19° incline, if the coefficient of kinetic friction is 0.45? Assume the force is applied parallel to the incline and the velocity is constant. (Enter the magnitude of the force.)

Math
If 7x + 5 = -2, find the value of 8x.

Math
If 7x + 5 = -2, find the value of 8x.

eco365
You should be ashamed of yourselve

Algebra 1
Say x is the number of boxes sold in week 1, then: Boxes in week 1: x Boxes in week 2: x + 5 Boxes in week 3: 2x + 10 Total boxes = 4x + 15 4x + 15 = 431 x = 104 So in week 1 there was sold x = 104 in week 2: x + 5 = 109 in week 3: 2x + 10 = 218

Algebra 1
integer 1 = a integer 2 = b b-a = 1 (b is one more than a) b-7 = 2*a (b is seven more than two times a) a = b-1 b-7 = 2*(b-1) b-7 = 2b-2 b = -5 so a should be -6 answer is C)

Physical Science
630J

Chemistry
Dear sir, madam, I am having a little problem with the solution my chemistry book gives on the following problem: We have a person whose body vitamine C concentration decays according to the following formula: 1500*0,974^t. Question A is no problem, but then question B: "...

Math
angle ABC ~= angle ACB BD perpendicular AC The sum fo the three angles in any triangle is 180 degree. Prove: mangle CBD = 1/2 mangle BAC

Math
ÚABC ~= ÚACB BD perpendicular AC The sum fo the three angles in any triangle is 180 degree. Prove: mÚCBD = 1/2 mÚBAC

PHY 101
A 0.425-kg blue bead slides on a frictionless, curved wire, starting from rest at point where h = 1.50 m. At point , the blue bead collides elastically with a 0.675-kg green bead at rest. Find the maximum height the green bead rises as it moves up the wire. PLEASE HELP I HAVE...

science
What happens when you burn magnesium metal using the big idea of energy?

math
If μ = 500 and σ =10, z = -3.0 falls how many points below the mean?

baking
I dont have any choices that why i cant find it.

baking
when making french doughnuts the paste is piped into rings onto _____ _____ and is then lowered into the fat.

Physics
Vector , which is directed along an x axis, is to be added to vector , which has a magnitude of 5.0 m. The sum is a third vector that is directed along the y axis, with a magnitude that is 5.5 times that of . What is the magnitude of ?

AP Physics
A monkey is hanging from a branch located exactly 24 meters along the ground from the hunter. The monkey is 14 meters above the ground. The hunter aims directly at the monkey and fires a water balloon at the monkey just as the monkey releases his grip. The balloon has an initi...

physics
A child operating a radio-controlled model car on a dock accidentally steers it off the edge. The car's displacement 0.58 s after leaving the dock has a magnitude of 7.1 m. What is the car's speed at the instant it drives off the edge of the dock?

physics
Stones are thrown horizontally with the same velocity from the tops of two different buildings. One stone lands twice as far from the base of the building from which it was thrown as does the other stone. Find the ratio of the height of the taller building to the height of the...

Math
1/2x+1/2=y

physics
A golf ball is dropped from rest from a height of 8.20 m. It hits the pavement, then bounces back up, rising just 5.40 m before falling back down again. A boy then catches the ball when it is 1.40 m above the pavement. Ignoring air resistance, calculate the total amount of tim...

Math
Find the pattern and fill in the blank. 94 26 ___ 14 10

Spanish
Will you please check my grammar? Thanks! In a one-page, typed essay, describe what you would do if you were the governor of your state (or mayor of your city). Include what you would do regarding three separate issues of importance in your state (or town). Si yo fuera el gobe...

geometry
Is it possible for two points on the surface of a prism to be neither collinear nor coplanar?

Math/physics
Known factors-weight 105 g---speed at start 60 mph---distance traveled 70 yds. Questions ,what is the rate of decelleration?, At what yard marker does it decellate to 35 mph For each 5 feet higher from start - how much farther does it travel. Thank you for your help, Tom

physics
the problem stated that the rod has expanded 1/4 its volume. I am looking for the heat supplied that has made its volume expand. please help :D

physics
How much heat is needed to be supplied to a 3.5 kg cylindrical rod if its volume changes by 1/4 of its original size? Assume that it is initially at 20K and that c = 2 cal/g.C and α = 8x10^2/C

physics
A 4.7 g bullet is fired horizontally into a 0.50 kg block of wood resting on a frictionless table. The block, which is attached to a horizontal spring, retains the bullet and moves forward, compressing the spring. The block-spring system goes into SHM with a frequency of 8.0 H...

Physics
What is the maximum theoretical efficiency of a steam engine operating between 60°C and 410°C?

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