Sunday
December 21, 2014

Posts by adrianna


Total # Posts: 54

Exponential decay
Show that if a radioactive substance has a half life of T, then the corresponding exponential decay function can be written as y=y0e^kt
September 4, 2014

Pre alegabra
There are 14 nickels, 10 dimes, 6 quarters, and 22 pennies, what's the probability I will pick a dime from the jar?
June 3, 2014

business
Growth potential and opportunity for a small cleaning service business
February 20, 2014

Math
I need assistance with statistics and probability. Can you some how assist me with that.?
January 3, 2014

Science
While in Europe, if you drive 109km per day, how much money would you spend on gas in one week if gas costs 1.10 euros per liter and your car's gas mileage is 39.0mi/gal ? Assume that 1euro=1.26dollars .
August 28, 2013

College Algebra
3x^4=648x someone help please im so confused. i am trying to find the solution set?
February 1, 2013

Arrays and an expanded algorithm
use the grid to draw a rectangle. Then complete the calculation. 30 x19
November 7, 2012

Pre-Cal
Find the distance from point (-1, 3) to the line 5x- 4y= 10.
March 21, 2012

Algebra
Slope = -1.5
March 21, 2012

Equation from Three Points*HELP*
Write the standard equation for the circle that passes through the points: (0, 0) (6, 0) (0, - 8) You must include the appropriate sign (+ or -) in your answer. Do not use spaces in your answer. x 2 + y 2 x y = 0 HELP PLEASE I NEED STEP BY STEP EXPLANATION!! I KNOW THAT THE ...
March 21, 2012

NEED MAJOR HELP! *QUADRATIC EQUATIONS*
It probably would be easy, but I don't have a teacher teaching me this. I do all my school work online and I just need this class to finish and graduate.
March 20, 2012

NEED MAJOR HELP! *QUADRATIC EQUATIONS*
Write the equation for the circle with center at (- 8, - 6) and radius of 10. (x+8)² + (y + 6)² = 10 (x+8)² + (y + 6)² = 100 (x-8)² + (y - 6)² = 100 Find the standard equation for the circle with center on the positive x-axis and passing through ...
March 20, 2012

Converting Polar Equations to Cartesian Equations
If theta= pi/3 , then to convert to a Cartesian equation, let x = A.(1/2)r B.(square root of2/2)r C.(square root of 3/2)r
March 20, 2012

Converting Cartesian Equations to Polar Equations
Thank you.
March 20, 2012

Converting Cartesian Equations to Polar Equations
Convert the Cartesian equation x^2 - y^2 = 16 to a polar equation. r² = 16/cos2è r = -4 r² = 8 help please im stuck between 2 answers.
March 20, 2012

inverse trig HELP PLEASE!!
Write the general solution to y = arcsin (0.6428). 40°±360°k 140°±360°k 220°±360°k 320°±360°k How do I find the right answer? I am like seriously stuck. I need help please.
March 18, 2012

Pre-Cal
A pilot wishes to fly on course 290 with an air speed of 300 knots when the wind blows from 224 at 18 knots. Find the drift angle to the nearest hundredth of a degree. A.3.22° B.5.07° C.86.86° A river is flowing at the rate of 2.4 miles an hour when a boy rows ...
March 17, 2012

Pre-Cal
thanks
March 17, 2012

Pre-Cal
Yes I am, but I don't understand it. I don't have a teacher to teach me. I do my work online, and I just need 2nd semester of pre-cal to graduate.
March 17, 2012

Pre-Cal
Can you tell me how you did it? I got 5 more questions like this one.
March 17, 2012

Pre-Cal
Two airplanes take off from an airport at the same time. One travels on a heading of 45 at 420 mph and the other on a heading of 150 at 400 mph. After two hours, how far apart are the airplanes? A.650.66 miles B.1,160 miles C.1,301 miles
March 17, 2012

Physics
Suppose that when you ride on your 7.90-kg bike the weight of you and the bike is supported equally by the two tires. If the gauge pressure in the tires is 72.5 lb/in2 and the area of contact between each tire and the road is 7.13 cm2, what is your weight?
February 26, 2012

Chemistry
A pure sample of (R)-limonene has a specific rotation of +125.6. If a sample had a specific rotation of +35.6, how much of each enantiomer is present in the sample? Show your work. I dont even know where to begin....please help :(
November 8, 2011

Math College
A 6-sided die is rolled 14 times. What is the probability of seeing a "6" at least 2 times? I am sooo clueless please help!
November 7, 2011

bobpursley
nope the town i live in is small, im actually like the only homeschooled child so nope we dont have any homeschool meetings...my materials get shipped to me from PA..i cant just like drop out from high school though...i have to finish this class...im almost done and about to ...
October 6, 2011

penn foster world history
@writeacher im in the high school program, to get my diploma, trust me when im done i will not be taking college with this school :)
October 6, 2011

penn foster world history
see ive passed Foragers,farmers,and Builders (exam 007678) & The Axial Ages And Fitful Transitions (exam 007679) but i failed Contacts,conflicts,and The Crucible (exam 007680), Convergence,divergence,and Global Enlightenments (exam 007681), Frustrations Of Progress;chaosand ...
October 6, 2011

Math
10.6 ft
April 28, 2011

CALC
point on the hyperbola 9x^2−6y^2=10 closest to the point (0, 7). y coordinate of each point= ? positive x coordinate= ? negative x coordinate= ?
April 6, 2011

Chemistry
The compound A1B2 (molar mass = 132) has a solubility of 13 g/L. Calculate the Ksp for this compound. I'm stuck on this question, please help?
April 3, 2011

Chem
net ionic equation of aluminum hydroxide + sodium hydroxide
April 2, 2011

Chemistry
Thank you!
March 23, 2011

Chemistry
The half-life of the first order reaction, A to products, is 53.2 s. What was the original concentration, (A)0 in moles per liter, if after 1.8 minutes, the concentration of A is 0.0783 moles per liter? Not sure whether to use integrated rate law or half life law?
March 23, 2011

Chemistry Lab
So we prepared 100mL of .1M solutions of these solutions, and found the pH and H+ contents: pH H+ HCl: .57 .270 HNO3: .58 .260 H2SO4: 1.29 .051 HC2H3O2: 2.44 .0036 H2C2O4: .84 .145 HKC6H4(CO2)2: 4.13 7.41 Now I'm stuck on this question. What conclusions can be drawn from ...
March 21, 2011

Chemistry
Haha, yes Chemistry is just a bunch of fun. And yes, thank you that helps a lot!
March 21, 2011

Chemistry
Oh, thanks! That was so simple! I'm a little confused on how to set up this question? A solution is prepared by mixing 535 mL of 0.30 M NaOCl and 494 mL of 0.26 M HOCl. What is the pH of this solution? [Ka(HOCl) = 3.2 × 10-8] Could you give me a hint?
March 21, 2011

Chemistry
Calculate the pH of a buffer solution that contains 0.23 M benzoic acid (C6H5CO2H) and 0.28 M sodium benzoate (C6H5COONa). [Ka = 6.5 × 10-5 for benzoic acid] Please help?
March 21, 2011

chemistry
Thank you so much!!
March 7, 2011

chemistry
A certain monoprotic weak acid with Ka = 6.7 × 10-8 can be used in various industrial processes, but is no longer used in chemistry teaching labs because it tends to explode when it gets old. (a) What is the [H+] for a 0.558 M aqueous solution of this acid and (b) what ...
March 7, 2011

english (debate)
hey im in the negative side.the topic is no homeworks on weekends and im the 3rd speaker it really sucks so can you guys help me
January 31, 2011

math
my daughter is working on calculating how many triangles point up in equilateral triangle. This is her bonus question: solve this problem for an equilateral triangle with sides measuring n units each. I'm lost, help.
November 17, 2010

4th grade
WRITING A BOOK REPORT WHAT IS THE IMPORTANT THING I SHOULD WRITE?
September 11, 2010

11th grade
x^2+4x+3
February 24, 2010

MATHS URGENT
The values for x when f(x) = 0 are: x=-2 and x=3 My question is: The function f(x) can be written in the form of a(x-p)(x-q)(x-r) Write down one possible set of values for p, q, and r? Now Ive got the correct answer x = -3, 2 and 2 Could you show me step-by step how to end up ...
October 1, 2009

Maths (URGENT)
The values for x when f(x) = 0 are: x=-2 and x=3 My question is: The function f(x) can be written in the form of a(x-p)(x-q)(x-r) Write down one possible set of values for p, q, and r? Now Ive got the correct answer x = -3, 2 and 2 Could you show me step-by step how to end up ...
October 1, 2009

Maths (URGENT)
The values for x when f(x) = 0 are: x=-2 and x=3 My question is: The function f(x) can be written in the form of a(x-p)(x-q)(x-r) Write down one possible set of values for p, q, and r? Now Ive got the correct answer x = -3, 2 and 2 Could you show me step by step how I got that...
October 1, 2009

Maths
The values for x when f(x) = 0 are: x=-2 and x=3 My question is: The function f(x) can be written in the form of a(x-p)(x-q)(x-r) Write down one possible set of values for p, q, and r? Now Ive got the correct answer x = -3, 2 and 2 Could you show me step by step how I got that...
October 1, 2009

9th grade
it's 6*1=6
September 1, 2009

social studies
what is the national democratic convention?
August 28, 2008

Math
Not really understanding solving the formual for the indicated variable. Solve for b2 h/2(b1+b2)
August 28, 2008

Crossword Question
an objected created and? used by humans
November 26, 2007

world history ancient
the knowledge,beliefs,customs,and values of a group of people?
November 26, 2007

social studies
What sailor provedthat Columbus did not reach Asia? http://www.google.com/search?as_q=sailor+Columbus+did+not+reach+asia&hl=en&rls=com.microsoft%3Aen-us%3AIE-SearchBox&rlz=1I7SUNA&num=10&btnG=Google+Search&as_epq=&as_oq=&as_eq=&lr=&as_ft=i&as_filetype=&as_qdr=all&as_nlo=&...
April 1, 2007

mathh (unit rate)
I have no ideahow to do any of this I just failed a test on it,do u multiply,divide,add,subtract,I have noIDEA!
August 22, 2006

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