Wednesday
September 17, 2014

Posts by Riley


Total # Posts: 253

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

Science
Is a tree a living organism? Yes, a tree is a living organism.
May 24, 2007

chemistry
help me predict the product sodium iodide-> You have only one reactant. Of course we could write sodium iodide ==> sodium iodide.
March 31, 2007

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