-3x^2 +10x
All you have to do is combine like terms!
868 is about 870, and 28 is about 30, so your expression would be 870 divided by 30 which would be 29 and the actual answer is 31, so your estimate would be close to your actual answer.
The three inside angles of a triangle need to equal 180 degrees.
Add the 3 equations together and set to equal 180:
7x+4 + 5x+3 + 2x+5 = 180
Simplify by combining the like terms:
14x + 12 = 180
Subtract 12 from each side:
14x = 168
Divide both sides by 14:
x = 168/14
x = 12
Division. You can divide 64 by 3 to find q.
