Answer / guest

A Freezable is a special type of object that has two
states: unfrozen and frozen. When unfrozen, a Freezable
appears to behave like any other object. When frozen, a
Freezable can no longer be modified.
A Freezable provides a Changed event to notify observers of
any modifications to the object. Freezing a Freezable can
improve its performance, because it no longer needs to
spend resources on change notifications. A frozen Freezable
can also be shared across threads, while an unfrozen
Freezable cannot.
Although the Freezable class has many applications, most
Freezable objects in Windows Presentation Foundation (WPF)
are related to the graphics sub-system.
The Freezable class makes it easier to use certain graphics
system objects and can help improve application
performance. Examples of types that inherit from Freezable
include the Brush, Transform, and Geometry classes. Because
they contain unmanaged resources, the system must monitor
these objects for modifications, and then update their
corresponding unmanaged resources when there is a change to
the original object. Even if you don't actually modify a
graphics system object, the system must still spend some of
its resources monitoring the object, in case you do change
it.

Perform the following tasks using MS-EXCEL: FUEL ESTIMATES COMPUTATIONS: This project is to compute the fuel needed for two types of airplanes, and the cost of the fuel. You must do all computations using formula, and do a chart. Use Page Setup to make the left margin 0.5 and the right margin 0.5 also. Put your name in the Title line, after "Fuel Estimates". Note the following: ? Col. D - H: You must enter correct formulas under Columns D through H (Flying Fuel, Reserve Fuel, Holding Fuel, Total Fuel Needed and Estimated Fuel Cost)!! Read and compute carefully! ? Cells C12, C13, C14, H13 or H14: When you use these cells in a formula, you must make them absolute cell references (F4 key after your type the cell reference, or enter the $ sign manually) ? Graph/Chart: Select cells A3:B8 (Plane and Flight). Hold down the "Control" key and select D3:D8. Hold down the "Control" key and select G3:G8. Create a chart (Insert- Chart, Finish) and position it in a pleasing way under the data for the flight. Print it on one sheet, in landscape mode. ? Print again, but with Formulae: There are two ways to show formulas: 1) Enter Control+` (the key with the ~ at the top left) or 2) Tools-Options, and under "Window Options" put a check mark beside "Formulas", then close the window.

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