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Why are letters used in algebra?
it is easier to substitute them for letters because if we used numbers then constants (numbers in algebra that don't have letters) would get mixed up with the algebraic letters. also makes things easier to read and to understand. also, if you don't have all the information, you can use letters to represent what you don't know
How do you find the measure of an angle in a triangle?
Add together the given angles, or the angles you already know or have been given measures for, and then subtract the added numbers from 180 and that is you answer.
X to the second power minus 9?
Just X to the second power minus nine. You can't subtract nine from x to the second power unless you know what x is.
When you solve equation describe how you know when there will be a infinite solutions?
If the solution contains one variable which has not been fixed then there are infinitely many solution.
Find the measure of the third angle in 65 and 70 degrees?
In plane geometry the angles in a triangle always add to 180 degrees. Add the two angles you know together and subtract the total from 180. This will give you the third angle.70 + 65 = 135.180 - 135 = 45
