Answer:

Step-by-step explanation:
The diagonals of a rectangle always bisect each other. Therefore, we can set
:

Answer:
39
Step-by-step explanation:
39 is a multiple of 13. 13,26,39.
3+9= 12 which is an even which works both for 6 and 4. 4,8,12. 6,12
Answer:
B
Step-by-step explanation:
5x² - 3 - (x² - 4x - 8)
5x² - 3 - x² + 4x + 8
4x² + 4x + 5
Answer: 105
Step-by-step explanation:
105 * .2 = 21 :)