Wednesday
May 4, 2016

# Posts by Riley

Total # Posts: 302

Math
-2,-1,0,1,2?
March 10, 2010

Math
Ted put several different integers in order from least to greatest. he then put the same integers in order from greatest to least. both times the same number was third in order. explain how this is possible?
March 10, 2010

Math
Ted put several different integers in order from least to greatest. He then put the same integers in order from greatest to least. Both times the same n umber was third in order.
March 10, 2010

AP Chemistry
Hi! For a strong acid-weak base titration what's an example of a titrant, analyte, appropriate indicator, pH at neutralization, and a typical graph of the titration? Help is much appreciated Thank you so much
February 26, 2010

U.S History
why did the colonists need their independence?
February 25, 2010

programming
Having trouble with this program running, can anybody help solve my problem: #include <stdio.h> #include <stdlib.h> #include <string.h> void draw_x(int width, int height); int main(int argc, char *argv[]){ int width, height; if(argc != 3){ printf("Syntax...
February 8, 2010

programming
I am having trouble writing this program for java. can anybody help write a program that prints the letter X composed of asterisk.
February 5, 2010

4th grade
What is the probability of rolling a cube
November 19, 2009

Health
I'm worried I might be having petit mal seizures. Every so often, I am doing something, then I lapse out for a few seconds then suddenly regain awareness. I still can see during this time, but my thoughts are interrupted, not by other thoughts, but just by this weird ...
October 30, 2009

The secret of gumbo grove
haha we are the people who dont read the book and wait till the last day to do the project:)
October 20, 2009

Finance
you take out a \$250,000, 30-year loan with monthly payments at a 6.5% interest rate. 4 years later, you refinance the remaaining balance at a 4% rate and pay a \$1,000 fee. What is the present value of the savings from doing this?
October 17, 2009

Physics
What does it mean to say that angular momentum is conserved? Give an example you might see on Earth. How could conservaton of angular momentum help astronomers understand the development of the solar system?
October 14, 2009

Physics
Show by algebraic reasoning that your gravitational acceleratoin toward an object of mass M a distance d away is a = GM/d squared and therefore doesn't depend on your mass.
October 14, 2009

science
Write a 350- to 700-word paper in APA format that includes all elements of the Energy Resource Plan outline.
July 12, 2009

Mathematics
A right circular cone of base radius r cm and height h cm fits exactly into a sphere of internal radius 12cm. a)Express r in terms of h. b)If the volume of the cone is Vcm cube, show that V=8¶h^2 - 1/3¶h^3 c)Find the value of r for which V has a turning value, and ...
June 19, 2009

Algebra
to solve with substitution is simple. Set the second problem equal to y. then insert this value in for y in the first equation. 6x+9y=(-12) y=27+5x 6x+9(27+5x)=(-12) Take is from here.
May 5, 2009

Math
First set up problems to solve each one assiging variables to each unknown. Remember, you need the same number of problems as you have variables.
May 5, 2009

algebra
4y^2*4x^2=14xy^4
May 5, 2009

Pre-Algebra
to solve for y in terms of y just set the equation equal to y. Then divide everything by the coefficiant of y. #1) 2x+7=y (already correct) #2) x-(2/3)y=3 x-3=(2/3)y (move y by itself) (x-3)/(2/3)=y (divide by 2/3) -->(3x-9)/2=y (simplify)
May 5, 2009

calculus
Thanks I get it now. I just couldn't figure out why they got 1000/3 and I got 8/0.024. I don't know why I didn't see that, just simple algebra.
May 4, 2009

calculus
I am reposting this because I still don't understand it. I need help with this problem. this is what I got so far: P(x)=12x-(x^2/500)-680-4x-0.01x^2 P'(x)=12-0.004x-4-0.02x P'(x)= -0.024x-8 x=8/0.024 My book says x=8/0.024 which somehow become 1000/3. They are the ...
May 4, 2009

calculus
I need help with this problem. this is what I got so far: P(x)=12x-(x^2/500)-680-4x-0.01x^2 P'(x)=12-0.004x-4-0.02x P'(x)= -0.024x-8 x=8/0.024 My book says x=8/0.024 which somehow become 1000/3. They are the same when solved but how did they come up with 1000/3?
May 1, 2009

9th grade Math
-8= (y/4) so multiply both sides by 4. On the right side the 4's will cancel and on the left it will be -32. -8 = (y/4) -8*4 = (y/4)*4 -32 = y Hint: Substitue your answer back into the original equation to check your work. So in this case check, does (-32/4) equal -8? Yes!
April 23, 2009

Calculus
how did you get the slope of the two lines? I get everything else though.
April 22, 2009

Calculus
Find an equation of the line through the point (3,5) that cuts off the least area from the first quadrant. How do I solve? I am stuck. The only thing I can come with is this: y-5=m(x-3) How to use this I don't know.
April 22, 2009

calculus
thanks!
April 22, 2009

calculus
V(h) = pie/3(R^2h-h^3) take the derivative with respect to h. using the chain rule I got: V'(h) = pie/3(2Rh+R^2-3h^2) but this is not the correct answer. what did I do wrong?
April 22, 2009

mathematics
4x+5/(2*sqrt(2x^2+5x+1))
April 22, 2009

Math
cirsumference of a circle equals 2*pie*radius
April 21, 2009

math
to find the slop solve for y. so for 5x+3y=6 put the y terms on one side and them divide through by the coeficient of y. 3y=5x+6 -divide thru by 3 y=5/3x+2
April 21, 2009

math
a perpendicular line is one who's slope is a reciprocal of the orginal equation.
April 21, 2009

artist
I am suposed to incorporate the answer to this question into a short repot on raphael. What makes a Raphael a Raphael? I can't find the answer anywhere on the interent. It is a title of a book so all I get is places to get the book not the answer to the question. could ...
April 15, 2009

Math
yep x=8
April 14, 2009

Math
read this it explains it. If you still don't understand I will be happy to help. algebra-help.info/simultaneous-equations.php
April 14, 2009

Math
The type of promblem you are dealing with is a set (in this case 2) simultaneous equations. You use the two equations TOGETHER to solve for x and y. Now do you get it?
April 14, 2009

Math
set the two equations up as simlutaneous equations and solve by substitution.
April 14, 2009

calculus
I am suposed to apply L'Hospitals rule to solve. I can't seem to solve it tho. could someone explain the steps to me? Thanks! the limit as x approaches infinity of: xe^(1/x)-x This is what I got so far: xe^(1/x)-x x(e^(1/x)-1) e^(1/x)-1/(1/x) Now its in the right form ...
April 14, 2009

physics
Why does a narrow strip of paper, attatched to a vent that is blowing air at a steady rate, wave and flap? I havn't taken physics yet but I would like to know the answer this question.
April 9, 2009

math/fractions
\$6 is 1/5 of the regular price. So the regular price is 5*1/5.
April 9, 2009

9th grade algebra
set up like this: 200*100*1*1 ----------- 1*1*2000*16 just do the math and your answer should come out right. if you are unsure whether the untis will cancel each other out as they did in this case then just right it all out each term its own fraction and see if the untis ...
April 9, 2009

9th grade algebra
Use parentheses to make things easier. [(x^2)-(4x/5)]*[(2/x)-2] [(x^2)*5/5-(4x/5)]*[(2/x)-2*x/x) (5x^2-4x) * (2-2x) --------- ---- 5 * x Multiply through to get: 10x^3+18x^2-8x -------------- 5x
April 9, 2009

math
12*10 is twice as much as 12*5 so 12*5 would equal one half of 12*10.
April 8, 2009

math
I would weigh the empty jar. then weigh the jar with marbles. Subtract the weight of the empty jar from the weight of the full jar. divide the remaining weight by 500 to find how much each marble weighs.
April 8, 2009

math
no because -1/2*-5= 5/2-8=-11/2
April 8, 2009

math
slope point is y-y1=m(x-x1) slope intercept is y=mx+b slope point: y+8=-1/2(x-5) solving gives us the slope intercept form of y=-1/2x-11/2
April 8, 2009

math
I don't understand the equation or i'd help u.
April 8, 2009

Algebra
I got -(5/24)xy-(27/20)x^3y^3+1.4y^3 Notice that the xy terms are of two DIFFERENT values. 1/8xy-1/3xy=-5/24xy That was your mistake.
April 8, 2009

Algebra
just add the terms together. you have two of each type of term. treat it just like a normal addition subtraction problem.
April 8, 2009

Algebra
Yes I would say that is the correct answer.
April 8, 2009

math
fraction to decimal: divide numerator by denominator. ex. 1/2=.5 decimals to percents: multiply decimal by 100. ex. .5x100=50
April 7, 2009

calculus-how to solve?
Could you explain how to solve? How would you do matrix algebra here?
April 7, 2009

calculus-answer??
so f(1)=a+b+c+d=0 f(-2)=-8a+4b-2c+d=3 f'(1)=3a+2b+c=0 f'(-2)=12a-4b+c=0 Now do I solve the system of equations for a,b,c,d? But is it possible to solve for this system of equations with 4 unknowns? Can I only substitute derivative into derivative and original into ...
April 7, 2009

calculus
Find the cubic function f(x)=ax^3+bx^2+cx+d that has a local max value of 3 at -2 and a local min values of 0 at 1. I have no idea how to solve this. Could you please give step by step answers and explanations for the steps. Thanks!
April 7, 2009

Gr.10 Math!!!! urgent
no set formula. Just remember in problems with more than one variable first factor the first two terms and then the second two terms and look for a common factor(s) which will usually appear in the parentheses or outside. Then multiply this by the remaining terms to get your ...
April 6, 2009

Gr.10 Math!!!! urgent
Did that make sense? were you able to solve #1 and understand #2?
April 6, 2009

Gr.10 Math!!!! urgent
The first one works like this: 8a^2+12ab-3b^2-2ab take the first two terms and notice the common multiple of 4 and a. they become 4a(2a+3b) Now take the last two terms and notice the common multiple of b. they become: -b(2a+3b) Now see the common factor in the parentheses? (2a...
April 6, 2009

Gr.10 Math!!!! urgent
2) first rearrang terms to solve x^2+5x+7x+35 x^2+12x+35 now what two numbers added together make 12 and multiplied make 30? those are your factors to go in the parentheses. Like this: x^2+12x+35 (x+?)(x+?) this is the answer then.
April 6, 2009

math
okay, yeah sorry I forgot to type my name in.
April 6, 2009

calculus-another Q
okay I get it now! But how do I find (C)find the intervals of concavity and the inflection points. I think I would take the 2nd derivative and set the numerator equal to zero and solve but i'm not quite sure how solve it.
April 6, 2009

calculus
(a) find the intervals on which f is incrs or decrs. (b) find the local min/max values of f. (c) find the intervals of concavity and the inflection points. f(x)=(lnx)/sqrtx I took the derivative and got 2-lnx/2x^3/2 take the values when f'(x) >0 I get 2-lnx > 0 2 >...
April 6, 2009

Geometry
Mean= The "mean" is the "average" you're used to, where you add up all the numbers and then divide by the number of numbers. Median= The "median" is the "middle" value in the list of numbers. To find the median, your numbers have to ...
April 4, 2009

algebra/trig
well I need to know the equivalent height of the target at 4.5meteres. I am given the information for the target and everything at 50m and I suposed to figure it out for 4.5m. I have to convert all the measurements into meters to solve. I need the height of the person's ...
April 3, 2009

algebra/trig
A person is standing 50meters away from a target whos center is 90cm off the ground. The height to the person's eyes is 66inches. Find the correct height for the target if the person is standing 4.5 meters from the target. I have tried a couples times to solve this problem...
April 3, 2009

geometry
sorry I tried to make a diagram up there but it turned into jibberish when I posted. Also I forgot to put that the angle between the ladder and the ground is 75.
April 2, 2009

geometry
First set up a right triangle: /) H / ) X (wall) / ) /75____) 4 (distance from ladder to wall) ladder=H distance from ladder to wall=4 height of wall=X We know that the ladder and the ground make a right triangle so we can use trig functions to solve. since tan is opposite ...
April 2, 2009

Algebra
yes it is (m+4)(2a-2)
April 2, 2009

Algebra
The first step is to remember that you can add exponents together. Then move everything into the numerator and add the exponets. this will give you your answer. (5x^-2)-(3y^-1) --------------- (original) (x^-1)+(y^-1) (5x^-2)+(x^1)-(3y^-1)+(y^1) (5x^-1)-3 (-2+1=-1, and -1+1=0)
April 2, 2009

calculus
So I put -1 in for dy/dx and got this equation: -2x^2y+2xy-x+y=0. Then would I solve for either x or y and substitute back in to the original equation to get a value for x and y?
April 2, 2009

calculus
Find all points on the curve x^2y^2+xy=2 where the slope of tangent line is -1. This is what I got. x^2y^2+xy=2 x^2*2ydy/dx + 2x*y^2 + x*dy/dx + y =0 dy/dx(2yx^2+x)= -2xy^2-y dy/dx = (-2xy^2-y)/(x+2yx^2) how do I finish from here? I need to know where the slop of the tangent ...
April 2, 2009

calculus
I need help simplifying this problem. f(x)=x^4/5(x-4)^2 f'(x)=x^4/5*2(x-4)+(x-4)^2*4/5x^-1/5 it is suposed to end up as this: 1/5x^-1/5(x-4)[5*x*2+(x-4)*4] but how do i get it to there? I need to see all the steps and how to get them. Thanks
March 31, 2009

biology
what factors help lead to the formation of a new species?
February 10, 2009

science
what is chemical energy and physical energy?
January 8, 2009

Math
I have to solve the system. 3x + y = 12 y = 9 - 3x I used the substitution method to get 3x + 9 - 3x = 12 But now I'm stuck.
November 12, 2008

College Stats
A machine fills 64 ounce detergent jugs. It is known that the net amount of detergent poured into each jug has a normal distribution with a standard deviation of 0.35 ounces. The inspector wants to adjust the machine such that at least 95% of the jugs have more than 64 ounces ...
October 28, 2008

Math
4+4=2
August 20, 2008

chemistry
how can you tell how many valence electrons family 3 (transition metals) have? im confused about this.
May 27, 2008

math
slope=-3 y intercept=-1
April 10, 2008

Chemistry
When CO2(g) (0.118 mol/L) and H2(g) (3.90 mol) in a 33.0 L reaction vessel at 980K are allowed to come to equilibrium the mixture contains 0.0853 mol/L of H20(g). What concentration (mol/L) of CO2(g) reacted? CO2(g) + H2(g) <--> CO(g) + H2O(g)
April 10, 2008

Chemistry
When 0.500 g of an unknown compound was dissolved in 15.0 g benzene, the freezing point depression was determined to be 0320C . The molar mass of the unknown compound is ? g/mol. (The freezing point depression constant for benzene is 512C kgmol .
April 7, 2008

Chemistry
? g of glucose C6H12O6 must be dissolved in 400 g of water to give a solution that is 0.258 m.
April 7, 2008

Chemistry
A solution is made by mixing 25.0 mL of toluene C6H5CH3 d=0867gmL with 135.0 mL of benzene C6H6 d=0874gmL . Assuming that the volumes add upon mixing, the molarity (M) and molality (m) of the toluene are how would i start this problem?
April 7, 2008

Chemistry
Is the solvation of borax in water an exothermic or endothermic process? i am thinking the it is endothermic...is that right?
April 7, 2008

science
i need to know if there are any technologies that were developed from the knowledge of static electricity. I also need to know what kinds of jobs people have that use these technologies. thanks
March 31, 2008

Physics
Two charges 10uC (point A) and -10uC (point B) are placed 10cm from each other. Find the electric field at a point P perpendicular bisector of AB at a distance 12cm from the middle. Can someone get me started on this one? I'd appreciate any help. Thanks
January 31, 2008

english
You could put:Women have been a great contributor to American culture.
January 30, 2008

english
I will go with Ms. Sue's answer. It could still be either way around.
January 30, 2008

Physics
Two charges (+4C and -3C)are separated by .00002m. What is the electrostatic force and its direction? Using Coulomb's law, I arrived at 2.696 x 10^20 J. Would the direction be said to be "towards the positive charge"? Is this correct? Thanks
January 30, 2008

Question
I have a question about my math. A cat falls in a hole at 12:00.The hole is 6ft deep. He climbs out at two feet per-minute,falling back one foot.What Time will the cat get out of the hole?
January 7, 2008

english
I need a version I can understand of The Prioress' Portrait from the General Prologue to the Canterbury Tales.
November 28, 2007

english
does anyone know a version of Twa Corbies that I can actually understand?
November 28, 2007

english
Was Chaucer the first author to use a frame story?
November 27, 2007

geography
Would Canterbury be considered in the Southeast part of England?
November 27, 2007

english (quote)
What does "almost everything in this isle enjoys immunity to poison" - Bede mean? Does it have something to do with Ireland?
November 27, 2007

religion
Since the imagination of evil encourages us to do real evil, how should we react to accounts from the media or elsewhere about monstrous evil in our neighborhood or elsewhere in the world?
November 26, 2007

religion
What ethic of interpretation is imposed on us by the fact that monstrous ritual is fantasy?
November 26, 2007

math
Jackies kitten is stuck on the window sill of her neighbors house. The window is 2.8m above the ground. The base of the ladder must be 0.7m away from the house and the ladder must extend 1m above the window sill. Will she be able to rescue the kitten, explain how..
November 7, 2007

graphs
If I have info. that fits into distinct catergories and want to compare totals what kind of graph should I use? A bar graph?
October 29, 2007

Algebra I
40(t+1.5)=60x t 2/3(t+1.5)= T
October 9, 2007

us history
The most useful indicator of the degree of democracy reached by a particular society is whether it has a... formal method whereby people can effect changes in government policy, system of government checks and balances, two-house legislature, system of liberal and humane ...
October 9, 2007

Physics
So what does this have to do with helping astronomers understand the development of the solar system? When the Earth rotates on its axis, is this part of angular momentum being conserved? Does angular momentum show the astronomers how the earth and other planets rotate?
October 6, 2007

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