Friday

January 30, 2015

January 30, 2015

Total # Posts: 55

**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*

**algebra math riddle...**

How meny cattel are there on the lazy circle double-o bar four square ranch
*October 2, 2008*

**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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