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A proportion is a special form of an algebra equation. It is used to compare two ratios or make equivalent fractions. A ratio is a comparison between two values. Such as the following: 1 apple :  3 oranges This ratio compares apples to oranges. It means for every apple there are 3 oranges. A proportion will help you solve problems like the one below. Jane has a box of apples and oranges in the ratio of 2 : 3. If she has six apples, how many oranges does she have? Before we begin to set up proportions for a word problem, we will concentrate on solving proportions. Remember, a proportion is a comparison between two ratios. The proportion shown below compares two ratios which are in the fraction form. 1 x - = - 2 6 The four parts of the proportion are separated into two groups, the means and the extremes, based on their arrangement in the proportion. Reading from left-to-right and top-to-bottom, the extremes are the very first number, and the very last number. This can...

1 x + 3 = 5 x =    step-by-step 2 x + -6 = 9 x =    step-by-step 3 -32 = x + 3 x =    step-by-step 4 29 + -1x = 13 x =    step-by-step 5 46 = 47 + -1x x =    step-by-step 6 12 = -1x + 1 x =    step-by-step 7 4x = 16 x =    step-by-step 8 2x = 10 x =    step-by-step 9 10x = 130 x =    step-by-step 10 14 = -2x x =    step-by-step 11 -3 + 2x = 11 x =    step-by-step 12 4x + 6 = -10 x =    step-by-step 13 x + 9 = 18 + -2x x =    step-by-step 14 2x + 6 = 4x + -2 x =    step-by-step 15 -1x + -1 = 221 + 2x x =    step-by-step 16 15 + 5x = 0 x =    step-by-step 17 17x + -12 = 114 + 3x x =    step-by-step 18 2x + -10 = 10 + -3x x = ...

Solving Equations These equations can be solved relatively easy and without any formal method. But, as you use equations to solve more complex problems, you will want an easier way to solve them. Pretend you have a scale like the one shown. On the right side there are 45 pennies and on the left side are 23 pennies and an unknown amount of pennies. The scale is balanced, therefore, we know that there must be an equal amount of weight on each side. As long as the same operation (addition, subtraction, multiplication, etc.) is done to both sides of the scale, it will remain balanced. To find the unknown amount of pennies of the left side, remove 23 pennies from each side of the scale. This action keeps the scale balanced and isolates the unknown amount. Since the weight(amount of pennies) on both sides of the scale are still equal and the unknown amount is alone, we now know that the unknown amount of pennies on the left side is the same as the remaining amount (22 pennies) on the r...

Basics of Algebra Algebra is a division of mathematics designed to help solve certain types of problems quicker and easier. Algebra is based on the concept of unknown values called variables, unlike arithmetic which is based entirely on known number values. This lesson introduces an important algebraic concept known as the Equation. The idea is that an equation represents a scale such as the one shown on the right. Instead of keeping the scale balanced with weights, numbers, or constants are used. These numbers are called constants because they constantly have the same value. For example the number 47 always represents 47 units or 47 multiplied by an unknown number. It never represents another value. The equation may also be balanced by a device called a variable. A variable is an an unknown number represented by any letter in the alphabet (often x). The value of each variable must remain the same in each problem. Several symbols are used to relate all of the variables and const...

Link for information http://elephly.net/downies/4-human-impacts-on-ecosystems.pdf

Link for a multimedia presentation https://drive.google.com/file/d/0B4GardjjzJkXWnNzQTBIdElyOGs/edit?usp=sharing https://drive.google.com/file/d/0B4GardjjzJkXXzVDT3F2YjZnRVo0blpiZDVkYUtxT21ucmhV/edit?usp=sharing Ecology  (from  Greek :  οἶκος , "house"; -λογία, "study of" [A] ) is the  scientific  study of interactions among organisms and their environment, such as the interactions  organisms  have with each other and with their abiotic  environment . Topics of interest to ecologists include the  diversity , distribution, amount ( biomass ), number ( population ) of organisms, as well as competition between them within and among  ecosystems . Ecosystems are composed of dynamically interacting parts including  organisms , the  communities  they make up, and the non-living components of their environment. Ecosystem processes, such as  primary production ,  pedogenesis ,  nutrient cycling , and various...

All Chapter Summaries Chapter 1 (The Girl in the Ice):  The title of the chapter refers to the imaginary side of Paris’ mind. Paris and her uncle Franklin are at the departure lounge of an airport awaiting their flight, but it is delayed. The strength of Franklin’s personality is made apparent by the way he behaves and what Paris tells us about him. He is powerful as in self-control, and according to Paris he can solve anything. Paris thinks that only she and Uncle Franklin are the ones who are the most mature. He goes to a police officer and calmly explains everything. In the meantime, Paris is looking into a fountain and sees a reflection of herself. She sees how still and motionless the reflection is, as if she was a girl trapped in ice, and couldn’t speak, until someone got her out. This is shown as a sign that Paris is yet unsure of herself, and she needs realization by someone else in order to become more mature. Then Uncle Franklin comes and takes her with him. Chapt...