Algebra: Chapter 2, Lesson 8, page 93.
Inverse of a Sum and Simplifying
The inverse of a SUM Property: For any rational numbers, `−(a+b)=−a+(−b)`. The additive inverse of a sum is the sum of the additive inverses.
In other words, if you have a `−` in front of a paranthesis, then just change the sign of EVERYTHING inside.
For example: `−(2a−7b−6)` becomes the opposite of each term, `−2a+7b+6`.
Another example: `3y-2-(2y-4)=3y-2-2y+4`. Combining like terms, we see the answer `=2y-4`
Two of tonight’s homework problems solved by MrE are here! Just click it!
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Algebra 1a: Chapter 1, Lesson 9, page 40.
Using Formulas
A formula is an equation that shows a relationship between 2 or more variables. The formula for the area of a rectangle is `a = l⋅w`. Given the length and width of an object, you can easily find the area. Be careful, however, and make sure that you are using consistent UNITS in the formula. Do not mix up seconds with minutes or hours or inches with feet or miles. The units must ALWAYS be consistent.
Don’t forget too to add the units to the answer!
Two of tonight’s homework problems solved by MrE are here! Just click it!