3a² - 2a - 4 + 2a -3a² + 5
Put all the like terms together
= 3a² -3a² + 2a - 2a + 5 - 4
Combine like terms
= 1
Answer: 1
Answer:
A
Step-by-step explanation:

Replace y with x.

Solve for y.



The answer should be 64 unless yu can have different amounts of kids
If I understand the question correctly, dots are written around the symbol to represent valence electrons, so 7 dots would be in the elements dot diagram. The element is in Group 17 with 4 other elements.
There you go. I explained in the picture hope it helps