# Recent Posts

Title | Description | Creator | created |
---|---|---|---|

Kepler's Third Law | Kepler's third law states the relationship between a planet's average distance from the sun and the time required for the planet to complete one orbit | Dr. Osama M. Khaled | Mar 29, 2024 07:55 PM |

Kepler's Laws | About 50 years before Newton formulated the law of gravity, Johanne Kepler (1571-1630) had found some rules that could be used to calculate the orbits of the planets | Dr. Osama M. Khaled | Mar 27, 2024 08:47 PM |

The Moon and Gravity | The moon is 240,000 miles from earth-center, or 60 times as far as we are from center | Dr. Osama M. Khaled | Mar 27, 2024 07:56 AM |

The Law of Gravity | Learn how gravity keeps the universe in balance | Dr. Osama M. Khaled | Mar 20, 2024 08:52 PM |

Find the reciprocal of a fraction | Division with fractions involves working with reciprocals | Dr. Osama M. Khaled | Mar 17, 2024 01:23 AM |

Solve application problems by multiplying fractions | The key word of often appears in application problems involving fractions. When a fraction is followed by the word of, it indicates that we are to find a part of some quantity using multiplication | Dr. Osama M. Khaled | Mar 14, 2024 07:37 PM |

Evaluate exponential expressions that have fractional bases | If the base of an exponential expression is a fraction, the exponent tells us how many times to write that fraction as a factor | Dr. Osama M. Khaled | Mar 12, 2024 04:54 AM |

Simplify answers when multiplying fractions | After multiplying two fractions, we need to simplify the result, if possible | Dr. Osama M. Khaled | Mar 06, 2024 08:40 AM |

Use properties of parallel lines cut by a transversal to find unknown angle measures | Lines that are cut by a transversal may or may not be parallel | Dr. Osama M. Khaled | Jan 28, 2024 07:52 AM |

Find powers of products | To raise a product to a power, raise each factor of the product to that power | Dr. Osama M. Khaled | Jan 18, 2024 03:55 PM |

Raise exponential expressions to a power | To raise an exponential expression to a power, keep the base and multiply the exponents | Dr. Osama M. Khaled | Jan 11, 2024 04:58 AM |

Single- and Double-Displacement Reactions | Recognize chemical reactions as single-replacement reactions and double-replacement reactions | Dr. Osama M. Khaled | Dec 28, 2023 06:10 AM |

Expressing Units | Learn the units that go with various quantities, express units using their abbreviations, and make new units by combining numerical prefixes with units. | Dr. Osama M. Khaled | Dec 26, 2023 04:33 AM |

Multiply exponential expressions | Multiply exponential expressions that have like bases | Dr. Osama M. Khaled | Dec 17, 2023 04:00 AM |

Identify bases and exponents | An exponent indicates repeated multiplication as a shortcut method of how many times the base is used as a factor. | Dr. Osama M. Khaled | Dec 16, 2023 08:13 AM |

Exercise 1: Vocabulary | Dr. Osama M. Khaled | Dec 11, 2023 03:44 AM | |

Application problems with unknowns | Solve application problems to find one unknown | Dr. Osama M. Khaled | Dec 02, 2023 08:40 AM |

Draw Formula Graph | Pass in the formula and draw its graph | Dr. Osama M. Khaled | Nov 23, 2023 01:49 PM |

Simplify algebraic expressions | Enter an equation or a mathematical expression to simplify | Dr. Osama M. Khaled | Nov 19, 2023 05:00 AM |

Simplify expressions to solve equations | When solving equations, we should simplify the expressions that make up the left and right sides before applying any properties of equality. Often, that involves removing parentheses and/or combining like terms. | Dr. Osama M. Khaled | Nov 18, 2023 10:07 PM |

Use more than one property of equality to solve equations | More complicated equations may require using more than one property to solve it. | Dr. Osama M. Khaled | Nov 07, 2023 07:28 AM |

Use the division property of equality | Dividing both sides of an equation by the same nonzero number does not change its solution. | Dr. Osama M. Khaled | Nov 04, 2023 09:27 AM |

Privacy Policy | Dr. Osama M. Khaled | Sep 09, 2023 11:22 AM | |

Video ... 5 User Story Pitfalls | There are common mistakes which BAs do while writing the stories. This short videos explains the 5 most common ones | Dr. Osama M. Khaled | Aug 30, 2020 06:48 AM |

Video ... 10 points that can ensure you capture value of business requirements | Capturing value in the requirements is very important. However, many BAs just ignore it and rather focus on the requirements not the value out of it. In this video, you will learn 10 points which will help you capture value of the requirements ensuring that you will be delivering really what is asked from you in a way that satisfies your stakeholders | Dr. Osama M. Khaled | Aug 30, 2020 06:51 AM |

What are the trade-off choices between performance and security? | A trade-off decision that many solution architects struggle to make is what requirements to compromise if security and performance requirements conflict? Something which I saw many times in my long career. One point of view is that good user experience is linked primarily to the performance of the system since it does make sense to provide good functionality but without a responsive system. On the other hand, some architects would see that providing a maximum level of security would give a better user experience. This may be true, but have they considered system performance while adding all security measures? | Dr. Osama M. Khaled | Sep 22, 2020 10:45 PM |

Variables and Memory Optimization | When you start coding, you need to be mindful to memory usage and leakage. | Dr. Osama M. Khaled | May 27, 2021 10:40 PM |

Make a phone number callable in Android | You may want to present a number and make it callable. | Dr. Osama M. Khaled | May 23, 2021 11:36 AM |

Check if a string is Null or Empty | It is sometimes not practical to work out a string object immediately before validating if it is null or not | Dr. Osama M. Khaled | May 17, 2021 09:58 PM |

Check if a string has a white space at any position | It is important sometimes to check a string and make sure that it does contain a white space (e.g. space, new line, tab, etc ...). | Dr. Osama M. Khaled | May 21, 2021 12:00 PM |

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