Answer:
2. 
3. 
Step-by-step explanation:
We add like terms together to simplify
2. 3x²-4x²= -x² -2x+5x= 3x 6+9= 15 all equal to -x²+3x+15
3. 2x²-3x²= -x² 6x-7x= -x 8+1=9 all equal to -x²-x+9
Answer:
209.96
Step-by-step explanation:
we know that the circumference of the circle is equal to
C = 
we have

substitute would be

assume that 
64
The answer is 289,564,320. Have a nice day and Happy Holidays
Yes they are equivalent expressions. If you take the z to the power of two, and subtract that from the other z to the power of two, it is zero. So you are left with four which is the answer