Thumbtack 2.2.1
Two solutions were found :
Thumbtack tosses. Record your value ofb. How does it compare with the conjecture you made in step l? If you tossed your thumbtack 50 more times (don't do it!), would you expect to get the same value of j? In chapter 9, we learned that the val- ues of6 in repeated samples could be described by a sampling distribu. Mar 11, 2016 Thumbtack 2.2.1 – Easy access to your Pinboard bookmarks. March 11, 2016 Thumbtack is a menu-bar utility that provides quick and easy access to the most recently saved bookmarks in your Pinboard account. 1.1 Motivating example: thumbtack tossing. A classical toy example of the random experiment in probability calculus is coin tossing. But this is a little bit boring example, since we know (at least if the coin is fair) a priori that the probability of both heads and tails is very close to (0.5). Instead, let’s consider a slightly more interesting toy example: thumbtack tossing.
- For security transactions, T+1, T+2, and T+3 refer to settlement dates that occur on a transaction date plus one, two, and three days, respectively.
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- t = -4/3 = -1.333
- t = -2/3 = -0.667
Step by step solution :
Step 1 :
Equation at the end of step 1 :
Step 2 :
Equation at the end of step 2 :
Step 3 :
Equation at the end of step 3 :
Calculating the Least Common Multiple :
4.1 Find the Least Common Multiple
The left denominator is : (t+1)2
The right denominator is : t+1
| Algebraic Factor | Left Denominator | Right Denominator | L.C.M = Max {Left,Right} |
|---|---|---|---|
| t+1 | 2 | 1 | 2 |
Least Common Multiple:
(t+1)2
Calculating Multipliers :
4.2 Calculate multipliers for the two fractions
Denote the Least Common Multiple by L.C.M
Denote the Left Multiplier by Left_M
Denote the Right Multiplier by Right_M
Denote the Left Deniminator by L_Deno
Denote the Right Multiplier by R_Deno
Left_M = L.C.M / L_Deno = 1
Right_M = L.C.M / R_Deno = t+1
Making Equivalent Fractions :
4.3 Rewrite the two fractions into equivalent fractions
Two fractions are called equivalent if they have the same numeric value.
For example : 1/2 and 2/4 are equivalent, y/(y+1)2 and (y2+y)/(y+1)3are equivalent as well.
To calculate equivalent fraction , multiply the Numerator of each fraction, by its respective Multiplier.
Adding fractions that have a common denominator :
4.4 Adding up the two equivalent fractions
Add the two equivalent fractions which now have a common denominator
Combine the numerators together, put the sum or difference over the common denominator then reduce to lowest terms if possible:
Equation at the end of step 4 :
Step 5 :
Rewriting the whole as an Equivalent Fraction :
5.1 Subtracting a whole from a fraction
Rewrite the whole as a fraction using (t+1)2 as the denominator :
Equivalent fraction : The fraction thus generated looks different but has the same value as the whole
Common denominator : The equivalent fraction and the other fraction involved in the calculation share the same denominator
Step 6 :
Pulling out like terms :
6.1 Pull out like factors :
-t2 - 2t = -t • (t + 2)
Adding fractions that have a common denominator :
6.2 Adding up the two equivalent fractions
Step 7 :
Pulling out like terms :
7.1 Pull out like factors :
-9t2 - 18t - 8 = -1 • (9t2 + 18t + 8)
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Trying to factor by splitting the middle term
Thumbtack 2011
7.2 Factoring 9t2 + 18t + 8
The first term is, 9t2 its coefficient is 9.
The middle term is, +18t its coefficient is 18.
The last term, 'the constant', is +8
Step-1 : Multiply the coefficient of the first term by the constant 9 • 8 = 72
Step-2 : Find two factors of 72 whose sum equals the coefficient of the middle term, which is 18.
| -72 | + | -1 | = | -73 | |
| -36 | + | -2 | = | -38 | |
| -24 | + | -3 | = | -27 | |
| -18 | + | -4 | = | -22 | |
| -12 | + | -6 | = | -18 | |
| -9 | + | -8 | = | -17 | |
| -8 | + | -9 | = | -17 | |
| -6 | + | -12 | = | -18 | |
| -4 | + | -18 | = | -22 | |
| -3 | + | -24 | = | -27 | |
| -2 | + | -36 | = | -38 | |
| -1 | + | -72 | = | -73 | |
| 1 | + | 72 | = | 73 | |
| 2 | + | 36 | = | 38 | |
| 3 | + | 24 | = | 27 | |
| 4 | + | 18 | = | 22 | |
| 6 | + | 12 | = | 18 | That's it |
Step-3 : Rewrite the polynomial splitting the middle term using the two factors found in step 2 above, 6 and 12
9t2 + 6t + 12t + 8
Step-4 : Add up the first 2 terms, pulling out like factors :
3t • (3t+2)
Add up the last 2 terms, pulling out common factors :
4 • (3t+2)
Step-5 : Add up the four terms of step 4 :
(3t+4) • (3t+2)
Which is the desired factorization
Trying to factor by splitting the middle term
7.3 Factoring t2+2t+1
The first term is, t2 its coefficient is 1.
The middle term is, +2t its coefficient is 2.
The last term, 'the constant', is +1
Step-1 : Multiply the coefficient of the first term by the constant 1 • 1 = 1
Step-2 : Find two factors of 1 whose sum equals the coefficient of the middle term, which is 2.
| -1 | + | -1 | = | -2 | |
| 1 | + | 1 | = | 2 | That's it |
Step-3 : Rewrite the polynomial splitting the middle term using the two factors found in step 2 above, 1 and 1
t2 + 1t + 1t + 1
Step-4 : Add up the first 2 terms, pulling out like factors :
t • (t+1)
Add up the last 2 terms, pulling out common factors :
1 • (t+1)
Step-5 : Add up the four terms of step 4 :
(t+1) • (t+1)
Which is the desired factorization
Multiplying Exponential Expressions :
7.4 Multiply (t+1) by (t+1)
The rule says : To multiply exponential expressions which have the same base, add up their exponents.
In our case, the common base is (t+1) and the exponents are :
1 , as (t+1) is the same number as (t+1)1
and 1 , as (t+1) is the same number as (t+1)1
The product is therefore, (t+1)(1+1) = (t+1)2
Equation at the end of step 7 :
Step 8 :
When a fraction equals zero :
Where a fraction equals zero, its numerator, the part which is above the fraction line, must equal zero.
Now,to get rid of the denominator, Tiger multiplys both sides of the equation by the denominator.
Here's how:
Now, on the left hand side, the (t+1)2 cancels out the denominator, while, on the right hand side, zero times anything is still zero.
The equation now takes the shape :
(-3t-2) • (3t+4) = 0
Theory - Roots of a product :
8.2 A product of several terms equals zero.
When a product of two or more terms equals zero, then at least one of the terms must be zero.
We shall now solve each term = 0 separately
In other words, we are going to solve as many equations as there are terms in the product
Any solution of term = 0 solves product = 0 as well.
Solving a Single Variable Equation :
8.3 Solve : -3t-2 = 0
Add 2 to both sides of the equation :
-3t = 2
Multiply both sides of the equation by (-1) : 3t = -2
Divide both sides of the equation by 3:
t = -2/3 = -0.667
Solving a Single Variable Equation :
8.4 Solve : 3t+4 = 0
Subtract 4 from both sides of the equation :
3t = -4
Divide both sides of the equation by 3:
t = -4/3 = -1.333
Supplement : Solving Quadratic Equation Directly
Earlier we factored this polynomial by splitting the middle term. let us now solve the equation by Completing The Square and by using the Quadratic Formula
Parabola, Finding the Vertex :
9.1 Find the Vertex of y = t2+2t+1
Parabolas have a highest or a lowest point called the Vertex . Our parabola opens up and accordingly has a lowest point (AKA absolute minimum) . We know this even before plotting 'y' because the coefficient of the first term, 1 , is positive (greater than zero).
Each parabola has a vertical line of symmetry that passes through its vertex. Because of this symmetry, the line of symmetry would, for example, pass through the midpoint of the two x -intercepts (roots or solutions) of the parabola. That is, if the parabola has indeed two real solutions.
Parabolas can model many real life situations, such as the height above ground, of an object thrown upward, after some period of time. The vertex of the parabola can provide us with information, such as the maximum height that object, thrown upwards, can reach. For this reason we want to be able to find the coordinates of the vertex.
For any parabola,At2+Bt+C,the t -coordinate of the vertex is given by -B/(2A) . In our case the t coordinate is -1.0000
Plugging into the parabola formula -1.0000 for t we can calculate the y -coordinate :
y = 1.0 * -1.00 * -1.00 + 2.0 * -1.00 + 1.0
or y = 0.000
Parabola, Graphing Vertex and X-Intercepts :
Root plot for : y = t2+2t+1
Vertex at {t,y} = {-1.00, 0.00}
t-Intercept (Root) :
One Root at {t,y}={-1.00, 0.00}
Note that the root coincides with
the Vertex and the Axis of Symmetry
coinsides with the line t = 0
Solve Quadratic Equation by Completing The Square
9.2 Solving t2+2t+1 = 0 by Completing The Square .
Subtract 1 from both side of the equation :
t2+2t = -1
Now the clever bit: Take the coefficient of t , which is 2 , divide by two, giving 1 , and finally square it giving 1
Add 1 to both sides of the equation :
On the right hand side we have :
-1 + 1 or, (-1/1)+(1/1)
The common denominator of the two fractions is 1 Adding (-1/1)+(1/1) gives 0/1
So adding to both sides we finally get :
t2+2t+1 = 0
Adding 1 has completed the left hand side into a perfect square :
t2+2t+1 =
(t+1) • (t+1) =
(t+1)2
Things which are equal to the same thing are also equal to one another. Since
t2+2t+1 = 0 and
t2+2t+1 = (t+1)2
then, according to the law of transitivity,
(t+1)2 = 0
We'll refer to this Equation as Eq. #9.2.1
The Square Root Principle says that When two things are equal, their square roots are equal.
Note that the square root of
(t+1)2 is
(t+1)2/2 =
(t+1)1 =
t+1
Now, applying the Square Root Principle to Eq. #9.2.1 we get:
t+1 = √ 0
Subtract 1 from both sides to obtain:
t = -1 + √ 0
The square root of zero is zero
This quadratic equation has one solution only. That's because adding zero is the same as subtracting zero.
The solution is:
t = -1
Solve Quadratic Equation using the Quadratic Formula
9.3 Solving t2+2t+1 = 0 by the Quadratic Formula .
According to the Quadratic Formula, t , the solution for At2+Bt+C = 0 , where A, B and C are numbers, often called coefficients, is given by :
- B ± √ B2-4AC
t = ————————
2A
In our case, A = 1
B = 2
C = 1
Accordingly, B2 - 4AC =
4 - 4 =
0
Applying the quadratic formula :
-2 ± √ 0
t = —————
2
The square root of zero is zero
This quadratic equation has one solution only. That's because adding zero is the same as subtracting zero.
The solution is:
t = -2 / 2 = -1
Two solutions were found :
- t = -4/3 = -1.333
- t = -2/3 = -0.667
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Thumbtack 2.2.1
Description
Thumbtack is a menu bar utility that provides quick and easy access to all of the bookmarks in your Pinboard account. You can easily save, search and share any of your bookmarks.
You do not have to be a Pinboard power-user to enjoy the benefits of having a Pinboard account. The Pinboard service is great at storing bookmarks to webpages for quick access at a later time. Thumbtack caters to that notion by simply providing immediate access to all of the items in your account directly from the menu bar.
Thumbtack 2 was re-written from the ground up exclusively for OS X Yosemite. This ensures that not only is Thumbtack quick and responsive, but it utilitzes the latest technology.
IN THE PRESS:
“Thumbtack, a menu bar utility that gives quick access to your Pinboard account. Slick.”
– David Sparks
Thumbtack 2.2.1 App
“Thumbtack is beautifully made. It’s a tiny application in many respects, making very few demands on your system or on your screen’s precious pixels.”
– Cult of Mac
FEATURES:
• Quick access to all of your Pinboard items
• Conveniently located in the menu bar
• Fast search with advanced filters including tags and unread items
• Easily share to any of OS X services like Facebook, Twitter and more
• Save items with the Safari Share extension or system-wide service
• Edit your Pinboard items by Command+Clicking on them.
• Native integration with Spotlight for finding and previewing items
• AppleScript support for extending to third-party apps
• Quicklook Preview bookmarks with the spacebar
• Fully customizable global hotkey
• Copy a bookmark with a single click
• Delete bookmarks from within Thumbtack
• Keyboard navigation
• Dark Theme when using Yosemite’s Dark Mode
• Retina compatible graphics
• Optimized exclusively for OS X Yosemite
• Easy to use and saves you time!
* A paid Pinboard account is required to use Thumbtack
What’s New in Version 2.2.1
– Added by popular demand: Multi-Tag Search!
– Supports search with boolean operators AND, OR, NOT
Use the “tag:” prefix to search tags
Example: “tag:tag1 AND tag2 NOT tag3”
This example would return Pinboard items that contain both tag1 and tag2 but does not have tag3
Learn more at https://reactivcode.com/thumbtack/help
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