♪ℓyιηg ιs yσυя fαvσriтε pαssιση♫

Evaluate the triple integral ∫∫∫ x^2e^y where E is bounded by the parabolic cylinder z=1-y^2 and the planes z=0, x=1, x=-1 (check limits of integration/work)?

I understand the parabolic cylinder is alone and has rulings parallel to the x axis

are my limits of integration correct?

∫ (0 to 1) ∫ (-1 to 1) ∫ (0 to 1-y^2) (x^2*e^y) dx dy dz

Brass is a copper and zinc alloy. A fitting composed of common brass has a total volume of 248.7 cm3 and a density of 8.6 gcm3. This fitting is found to contain 1.332×1025 atoms of copper .

How many atoms of zinc does the fitting contain?

Bronze is a copper and tin alloy. A particular bronze sample contains 37.8% tin by mass and has a density of 8.71 gcm3. A fitting composed of this bronze alloy has a total volume of 160.4 cm3.

How many atoms of tin does the fitting contain?

Hi, I'm really struggling with a worksheet, I was wondering if someone could check my work and explain where i went wrong so i understand how to do it in the future- Thanks

Simplify:

Problem #1:

3a^2 - 24a

---------------

3a^2 + 12a

I got:

a-8

-----

a+4

by canceling 3a out of 3a^2 and 12a and also by canceling 3a out of -24a and 3a^2

Problem #2:

(5s^2 / s^2 - 4) * (s + 2/10s^2)

for this i got: 1/(s-2)(2s^3) by canceling 5s^2 from 5s^2 and 10s^5 and by canceling s+2 from s+2 and s^2 - 4

Problem #3:

(q^2 + 2q / 6q ) * (q^2 - 4 / 3q^2)

For this.. i made it (q^2 + 2a)/6q * (3q^2)/(q^2 - 4) by multiplying by the reciprocal

I canceled out q^2 from q^2 + 2a and from q^2 - 4

I also canceled out 3q from 6q and 3q^2

which gave me 6a/-2 or -3a

Lastly, Problem #4:

(t^2 + 19t + 84 / 4t-4) * (2t - 2 / t2 + 9t + 14)

I factored out: t^2 + 19t + 84 and got (t + 7)(t+ 12)

and i also factored out t^2 + 9t + 14 and got (t + 2)(t+7)

both factored by MARFing

This made the problem:

(t+7)(t + 12) / 4t - 4 * (2t - 2)/ (t+2)(t+7)

I canceled out the t+7 and this left me with...

(2t - 2)(t + 12) / (4t - 4)(t+2)

I wasnt sure if i could reduce/cancel out further....

Thanks :P

Hi, i completely do no understand..

you do not have to give me th answer but an explanation how to do these types of problems would be greatly appreciated so i can understand on my own how to do it..

for the first:

x^5 + 4x^3 = 0 solve th equation. state the number and type of roots.

i tried factoring: x^3 (x^2 + 4) = 0

x^3(x+2)(x+2) = 0

Similarly, 4x^2 - 4x - 1 = 0

I wanted to MARF, but it wont work. and you cannot factor using GCF since there are no common factors.

State all the zeros of each function:

h(x) = x^3 - 5x^2 + 5x + 3

h(x) = x^3 + x^2 + x - 6

i knwo you use synthetic but..augh.

Write a polynomial function of least degree w/ integral coefficients that has given zeros:

-3, -5, 1

and -5+i

thank you..

Hi, I have a samsung solstice phone and just recently purchased an 8G micro SD card hoping that it would allow more space/storage for messaging as im running out of room in my inbox because i save messages. However, none of the memory on the micro sd card was alloted to my messaging/inbox and most of it went elsewhere in which i do not need more memory - as in for pictures, audio, etc...

Is there a way i can format/change it so more/the majority even of the memory of the 8g micro sd card ia lloted towards messaging?

Thanks so much!!

I'm studying for the AP Bio exam: would you recommend using these 2 books to study from, or are there any you would strongly recommend?

http://www.amazon.com/Preparing-Biology-AP-Exam/dp...

Preparing For The Biology AP Exam: With Biology <- Supplemetary to my AP Bio Campbell 7th edition text book

http://www.amazon.com/CliffsNotes-Biology-Phillip-...

CliffsNotes AP Biology 3rd ed. w/ CD

and I also already have Barron's..

Thanks so much!

At a retail store, the price for a med. shirt is 14.99 & the price for a large shirt is 19.99. Sherrie bought 10 shirts at the store and paid a total of 169.90, excluding tax. How many medium shirts did she buy?

A.3

B.4

C.5

D.6

E.7

D is the correct answer.

However, I wasn't sure how to solve for it on the test, therefore did:

for 10 shirts total she could buy..

A: 3 @ 14.99 and 7 @ 19.99 but that = 184

B: 4 @ 14.99 and 6 @ 19.99 but that = 393

etc..

and did C which was 6 @ 14.99 and 4 @ 19.99

(6 x 14.99) + (4 x 19.99) = 169.90 therefore getting the correct answer..

However this process is lengthy/time consuming for a test, and simply plugging in answers..

Could you please explain to me a better and more efficent way to solve for this problem?

Thanks!

Hi, I was working through a previous practice ACT test to study.. i came across 3 problems that i got wrong that i'm unsure how to solve for - any help would be greatly appreciated!

Hallie types an avg, of 13wpm, & Maria types an avg, of 27wpm. At these rates, how many more minues does Hallie need than Maria to type 1,755?

The answer is 70.

If h(x) =4x^2 - 3x+13 then h(-17) =?

Answer: 230

Which of the following expressions is equal to -2y^2 + 4y?

Answer: -2y(y-2)

In other words when deciding whether or not to use amount or number in dictation..

>will "amount" always modify a singular noun in a prep phrase

>and will "number" always modify a plural noun in a prep phrase?

>or can they modify sing/plural nouns elsewhere/that will not always necessarily be in a prep phrase?

the most ive been able to find is

1.heat the algae to 300 degrees

2.maintain the pressure of the water so it remains liquid

3.cook the soup for 30 minutes to an hour

and

Making Algae Biodiesel at Home by David sieg -- which is over $160

==

http://www.sciencedaily.com/releases/2010/04/10042...

[[As of now im interested in Biological Engineering and things like that]]

Thank you!

OC bisecs angle AOE

angle 1 = AOB

angle 2 = BOC

angle 3 = COD

angle 4 = DOE

measurement of angle 1 = 5a+2;

measurment of angle 2 = 2a-7;

Measurement of angle 3 = 4a;

measurement pf angle 4 = 7

==============================

i worked it as

5a + 2 = 2a-7

added 7 to both sides and got

5a+9 = 2a

subtracted 2a from both sides and got

3a+9= 0

made it 3a+9 = 4a + 7

subtracted 3a from both sides and got

9 = a+7

subtracted 7 from both sides and got

2=a

which meant that

m or measurement of angle 1 = 12

m angle 2 = -3

m angle 3 = 8

m angle 4 = 7

angle 1 +2 should = 3+4 in my mind..but it isnt??

HELP!

If this were the line..it'd look like

L-----m-----n-----o-----p

as if the letters were points and the dashed lines were a straight line.

N is the midpoint of line LP.

LN = 30; NO = 3d; OP 6d+12

SO: i worked it as LN = NP

or NO = OP (3d= 6d+12)

LN = 30 so NP should = 30 with NO and OP each equaling 15

i set it up as 3d=6d + 12

subtracted 6d from both sides and got -3d = 12

divided -3 on both sides and got d=-4

Plugged in the variable of d:

NO = 3(-4) = -12

OP= 6(-4)+12 = -12

But if NO = OP = NP which means -12 + -12 = -24

LN is NOT equal to NP..

what did i do wrong?? HELP!

I am undecisive but im very interested in enviromental/chem/biological engineering.

Im especially interested in abiotic/biotic testing, plant tissue cell cultures, water quality, etc

Im currently still in highschool but very involved in science related programs..

Thanks (: