Thursday
July 31, 2014

Posts by Kate


Total # Posts: 1,666

Math
-1/2

Math
The reference angle for 8pi/3 is pi/3. 8pi/3 = 6pi/3 + 2pi/3 = 2pi+2pi/3 2pi/3 is in the second quadrant, where cosine is negative and cos(pi/3)=1/2 So the cos(8pi/3)= -cos(pi/3) = -1/2

Math
use the product rule: (first times der of second) + (second times der of first)

math
3*3+3=12

algebra
what's the question asking?

Algebra II-Please check my solution
You're right. I'm sorry. When I saw the missed step, I stopped looking at the rest of the work. You are correct.

Algebra II-Please check my solution
you're on the right track but when you tried to subtract the 2 eq you only subtracted the first term, but left the others' signs the same. It should look like this: 4x+6y=4 -4x+2y=28 now add the two eq together and redo the work you did before. if you have more questio...

Math
The ground would be a height of zero. So set your equation equal to zero and solve. 0=-9.8t^2-10t+330 If you need more help, respond to this post.

Math
you can think of opposite as diagonally in this situation

Math
Opposite angle of a parallelogram are equal. Consecutive angles are supplementary. W must be opposite Y so it equals 65. Remember that supplementary angles means they add up to 180. You can figure out X and Z.

math- check me
no. First multiply both sides by 5y, giving you -3=-45y, then divide by -45 -3/-45 = y this reduces to 1/15

6th grade math
The only figure similar to a square is another square. If the side of the square is 5cm, then the area is length times width, which would be 5 * 5 since all sides of a square are equal. So what's 5 * 5?? And don't forget to write cm squared after.

algebra 2
First add 15 to both sides to get all terms on one side of the equal side and a zero on the other: a^2-8a+15=0 Then set up your parentheses. ( )( )=0 Now ask yourself, what two things multiplied together = a^2? a*a So put one of each in the first place in the parentheses. (a )...

alg readiness
A mixed number looks something like 3 1/2, read "3 and one half." Writing that as addition would be 3 + 1/2. To write it as a single fraction, you need to change it into an improper fraction by multiplying the denominator (2) by the whole number (3) and then adding t...

Math
Not necessarily. Only if it's a rectangle. But a rectangle is a more specific parallelogram.

algebra
Try using parentheses and the / sign for division when you type your question. I can't really understand what's going on here.

algebra
I would imagine it would read the average of the two weights: (60+43)/2 = 103/2=51.5 pounds.

math
If you received a $10 reward, then you spent between $50 and $99.99 If you received a $20 reward, then you could have spent $100, $125, or $149.99. If your purchase is $98, then you'd be better off spending $2 more, so that you'll get another $10 gift card. That would ...

Math Correct?
Yes. Since all the angles of a square are 90 degrees, two of them will always add to 180 degrees, which is the definition of supplementary.

alg
Sorry, silly error... 5y=25 y=5 (1,5)

alg
(9x+5y)=34 (8x-2y)=-2 You need to eliminate a variable so first pick either x or y to eliminate. I'll choose y. To eliminate y from the equations, you need to multiply by numbers that will give you zero y when you add the equations together: 2(9x+5y)=34*2 5(8x-2y)=-2*5 18x...

math
out=-25+25=0

college psychology
it effects the temporal lobe of the cerebral cortex

college psychology
What areas of the brain are affected and how are they affected with sleep deprivation?

algebra
Well, what I wrote would be considered the appropriate work shown.

algebra
You really should write a linear equation: You're right on calculating the rate. It is 4. You can also call that the slope of the line. In y=mx+b form, y=4x+b Since you started at 11 in 2006, 11 is your y-intercept (b) y=4x+11 Again, since you started at 2006, 2011 is 5 ye...

algebra
What exactly is the question? If you have to solve the inequality, then you would subtract 2.2 from both sides, leaving you with: x<2.3

Calculus
The Product Rule is: (First*Derivative of Second)+(Second*Derivative of First) In your case: First is (x^3-2x) and Second is (5x^2+2x) Try that and write back if you're still having trouble.

Pre-Algebra
Yes they are all correct.

geometry
Ratios are usually good to set up like this: 4x+7x+5x=64 in this case. 4x = the shortest side, 7x = the longest side, and 5x = the middle side. Then solve for x. 16x+64 x=4 Then plug 4 back in for x to see what the individual side lengths are. 4*4=16 for the shortest side.

algebra
Substitute 2 in the inequality and see if the sentence is true. 4(2)+8<12 8+8<12 16<12 False, so 2 is not a solution. Do it again with 0 and see what happens. If need more help write back.

Discrete Math
Domain is correct. Range is all real numbers except 5. Since 1/(1+x) can never be 0, the equation will never be 5. Write back if you still have questions.

math
This question does not make sense, given that 2/5 + 3/4 = more than 1. Is there more information to this question?

math
Let x = number of gallons of %5 milk 0.05x + 0.01(100) = 0.02(x+100) 0.05x + 1 = 0.02(x+100) 0.05x + 1 = 0.02x + 2 0.03x = 1 x = 33 and 1/3 Write back if you need more explanation

8th Grade Algebra
In a standard deck there are 13 hearts and 4 aces. However one the hearts is an ace. So we're talking 13+4=17 cards, but then subtract one (16) for the ace of hearts that would be repeated if counting the hearts and aces separately. So 16/52 is the probability. This can be...

math
A=P(1+r)^t A=amount of money at end P=amount of money to start r=interest rate as a decimal t=number of years 20000=P(1+.05)^5 20000=P(1.05^5) 20000/(1.05^5)=P $15670.52=P

8th grade Algebra
(5/100)*(5/100)=25/10000=0.0025 or .25%

math
The center of the rectangle is equidistant from each vertex. If you make the center of your circle the center of the rectangle, then the four vertices of the rectangle will be equidistant from the center of the circle as well, making each distance from the vertex of the rectan...

math
Substitute -12 in for x in the above equation and solve for y. 6y+5(-12)=15 6y-60=15 simplifying 6y=75 adding 60 to both sides y=12.5 dividing both side by 6. k=12.5

Math
A circular tablecloth is draped over a rectangular table so that the center of the cloth is directly above the center of the table. The table is 6 X(times) 2sqrt(3)feet, and the cloth has a radius of 2 feet. What is the area of the portion of the tablecloth covered by the cloth?

Chemistry
A buffer solution of pH=9.24 can be prepared by dissolving ammonia and ammonium chloride in water. How many moles of ammonium chloride must be added to 1.0 L of .50 M ammonia to prepare the buffer?

Chemistry
What is the [S^-2] in a saturated solution (.1 M) of H2S, in which the pH had been adjusted to 5.00 by the addition of NaOH? For H2S, Ka1= 1.1X10^-7 and Ka2=1.0X10^-14

Chemistry
if u add if you add 2.0 ml of 10.0 M HCl to 500 ml of a .10 M NH3, what is the pH of the resulting solution? for NH3, kb=1.8X10^-5

ap chem
.004

Chemisrty
what is the molality of a 0.075m of ethyl alcohol in water at 25 degrees celcius. Assume the density of the solution at such low concentration is equal to that of water at 25 degrees celcius, 0.997g/ml

Math
f(x)=-x

business
Research the VISA website. After reviewing of all the documents you can find on the web and in libraries, write a 3-page response to the following questions

calculus, limits, l'hopital
Thanks. I made a really stupid error. You've been very helpful in answering my calc questions. I really appreciate it.

calculus, limits, l'hopital
Find the limit as x->0 of (2-2cos(x))/(sin(5x)) Mathematically I got 2/5, but on the graph it appears to be 0.

math
is that 9 times q times t times 9 times p times t?

math
i dont get scale draings how do you work it out?

Minds at work
A person that has a sevre overreation to an intense emotion might be experiencing a a. galvanic skin response b. sympathetic rebound c. suppressed emotion d. parasympathetic rebound if you relearn a song that you heard as a child, your savings score for relearning the song wou...

Teacher's Aide: Helping Abused Children
I don't mean to be mean on this end but that is a very rude thing to ask anyone. 1st off i'm newly married, 6 months pregnant, and this is not the only thing that i'm going to school for. i actually have a 91% in my class and this is the only test that i've had...

Teacher's Aide: Helping Abused Children
i for got to post my answers: 1) B 2) D 3) A 4) A 5) C 6) B 7) D 8) A 9) C 10)C

Teacher's Aide: Helping Abused Children
1. The Stubborn Child Law enacted by Massachusetts in 1646 permitted parents to A. use corporal punishment when children disobeyed them. B. keep children out of school if they were needed for family work purposes. C. institutionalize a child born with a physical or mental disa...

algebra
Let x = the salary of the husband. So Lien earned x+1700. Lien's salary + her husband's = 42100 x + 1700 + x = 42100 2x + 1700 = 42100 2x = 40400 x = 20200 Lien's husband earned $20200, and Lien earned 1700 + 20200 = $23900.

Math
What are the directions? It's not clear what to do.

calculus
Set the denominator equal to zero and solve for x. 3x-14 = 0 3x=14 x=14/3 This is the x-coordinate of the vertical asymptote.

math 5th grade
First I would choose a number divisible by 9 to use as an example. I chose 81. If 8/9 of the customers ordered coffee, that's 8/9*81 = 72 customers. If reg coffee was ordered three times as much as flavored, then you want to set it up like this: 3x + x = 72 4x = 72 x = 18 ...

Math
It depends a little on what math class you're in how they want you to solve this. But basically, this function is a parabola and you need to find the vertex. x=-b/(2a), where a=-0.5, and b=12 x=-12/(2*-0.5)=12, this is the x coordinate of the vertex and also the number of ...

math
First subtract 45-27 = 18 Then subtract 5-8 = -3. Next multiply 3 by -3 = -9 then divide 18 by -9 = -2 finally, the absolute value of -2 = 2.

Repost- Calculus; someone please help
Yes it is the right equation. Good job!

calculus, limits, l'hopital
Here's what's weird: I graphed the equation and from the left the function approaches 1 as x approaches zero, and from the right it approaches e^3. Doesn't that mean the limit does not exist? The question, however, is multiple choice, with choices of infinity, 0, 3...

calculus, limits, l'hopital
Thank you so much! I didn't think to remove the 6x. So helpful, thank you!!

calculus, limits, l'hopital
Using l'hopital's rule, find the limit as x approaches zero of (e^(6/x)-6x)^(X/2) I know l'hopital's rule, but this is seeming to be nightmare. I just don't seem to get anywhere. I mistyped the first time I posted this question.

advanced funtions
Similarities: Domain and Range the same. Same end behavior, you could say "as x approaches infinity or negative infinity". Differences: They don't have the same reflection characteristics because an x^4 function can have non-symmetrical bumps in it. They're n...

calculus, limits, l'hopital
Using l'hopital's rule, find the limit as x approaches infinity of (e^(6/x)-6x)^(X/2) I know l'hopital's rule, but this is seeming to be nightmare. I just don't seem to get anywhere.

math
6.4-y = 6 and 2/5 convert 6 and 2/5 to decimal... 2/5=.4 6.4 - y = 6.4 subtract 6.4 from both sides -y = 0 divide both sides by -1 y = 0

Math
1.24*10^-3 = .00124

algebra word problems
294/14=21 L=6*21=126

8th grade math
935*1.4 mil = P*4.5 mil (mult 935 by 1.4) 1309 mil = P*4.5 mil (divide both sides by 4.5) 290.8888888888888=P So P = $290.89

I need an answer--molecular/electron geometry
THanks so much

I need an answer--molecular/electron geometry
Can anyone help me out with the differences between electron geometry and molecular geometry for SCl6? I think the molecular geometry is octahedral, but I'm not so sure for the electron geometry. Thanks :) *My earlier post wasn't answered, so I'd appreciate some he...

math
put it into simple form?

Equivalent. Fraction
What is 6/12 in a equivalent fraction

Algebra
56/21?

Molecular and Electron geometry
Can anyone help me out with the differences between electron geometry and molecular geometry for SCl6? I think the molecular geometry is octahedral, but I'm not so sure for the electron geometry. Thanks :) *My earlier post wasn't answered, so I'd appreciate some he...

math
if a figure has 48 square units as it's area and 38 units as it's perimeter what would the figure look like?

english
diction?

Molecular and Electron geometry
Can anyone help me out with the differences between electron geometry and molecular geometry for SCl6? I think the molecular geometry is octahedral, but I'm not so sure for the electron geometry. Thanks :)

REPORT CARD QUESTION
Congrats

science
The formula for frequency is: frequency = 1 / T, where T = Period. That is e.g. "cycles per second". The formula for time is: T (Period) = 1 / frequency. Note: T = Period and t = Time

SCl6 is used in....?
Thank you very much

SCl6 is used in....?
But elements compose compounds. So a compound, say SCl6, cannot create silicon dioxide. . . . I'm now thoroughly confused.

SCl6 is used in....?
But isn't SCl6 a compound within itself?

SCl6 is used in....?
Does anyone know what SCl6 is used in? Note: I don't mean SF6. *Sulfur Hexachloride* Thank you :)

SCl6, Sulfur Hexachloride
Very helpful, thank you!

SCl6, Sulfur Hexachloride
I have a project on Sulfur Hexachloride, or SCl6, but I can't find any info on it! Any help?

Chemistry
I have a project on Sulfur Hexachloride, or SCl6, but I can't find any info on it! Any help?

Chemistry
your dumb

Chemistry
When ice melts, it absorbs 0.33 per gram.How much ice is required to cool a 12.0 drink from 72 to 37, if the heat capacity of the drink is 4.18 ? (Assume that the heat transfer is 100 efficient.)

physics
A tennis ball is shot vertically upward from the surface of an atmosphere-free planet with an initial speed of 20.0 m/s. One second later, the ball has an instantaneous velocity in the upward direction of 15.0 m/s. What is the magnitude of the acceleration due to gravity on th...

physics
Explain why the occupants in a running car observe objects on the roadside as though they are running backwards.

public relation
what has the result of what the artist Chris Brown led for the public to say or view him?

technology
does that mean the hard drive size or this Double-layer DVD±RW/CD-RW or something

technology
what does Hard Disk-FDD/HDD mean?

Geometry
In Triangle SUM, if SU = 10 cm and UM = 15 cm then MS must be less than how many centimeters? 10 15 20 25...... Am I right?

english
like you might avoid paying your bill in order to purchase something you want

english
What effect does lacking personal responsibility have on materialism?

geometry
Find the perimeter of an isosceles trapezoid with base lengths of 10 and 18 and height of 8.

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