COMPASS Math Test Prep | MathHelp.com - By MathHelp.com
| 00:0-1 | here's the rule you need to remember when you see | |
| 00:03 | an equation that involves a fraction . Get rid of | |
| 00:06 | that fraction as soon as possible . We've already talked | |
| 00:11 | about one way of getting rid of a fraction , | |
| 00:13 | which is by multiplying both sides of the equation by | |
| 00:16 | the reciprocal of that fraction . A more common and | |
| 00:21 | more versatile way , however , of getting rid of | |
| 00:23 | a fraction is to multiply both sides of the equation | |
| 00:26 | by the denominator of the fraction . So in the | |
| 00:30 | problem you see here , since the denominator of our | |
| 00:33 | fraction is seven . We get rid of the fraction | |
| 00:37 | by multiplying both sides of the equation by seven oh | |
| 00:44 | On the left are 7s cancel And we have negative | |
| 00:49 | 3 -5 b . Yeah , On the right -4 | |
| 00:55 | times seven is negative 28 notice that are fractions are | |
| 01:01 | gone and we're left with a problem that looks just | |
| 01:04 | like the ones we were doing in the previous section | |
| 01:08 | . Our next step is to isolate the B . | |
| 01:10 | Term by adding three to both sides . Yeah , | |
| 01:18 | we get negative five B equals negative 25 . Don't | |
| 01:25 | forget to bring down the negative to get be by | |
| 01:28 | itself , divide both sides by -5 , And B | |
| 01:35 | equals positive five . |
DESCRIPTION:
This lesson covers the sum of the interior angles of a polygon. Students learn the definitions of vertices and diagonals of polygons. Students also learn the following formulas related to convex polygons. The sum of the measures of the interior angles of a polygon is always 180(n -- 2) degrees, where n represents the number of sides of the polygon. The sum of the measures of the exterior angles of a polygon is always 360 degrees. Students are then asked to solve problems using these formulas.
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