HI THIS IS VERY HARD CAN U GIVE ME MORE TIME
Answer:
An atom of sodium has 11 proton, 11 electrons, and 12 neutrons.
Answer:
I believe it is an acute angle
Answer:
acute triangle
Step-by-step explanation:
A triangle with all angles less than 90 degrees has all angles that are acute.
Acute angles are less than 90 degrees
Answer: 84
<u>Step-by-step explanation:</u>
Set up a proportion as follows: 

Cross multiply: 12x = 7 × 144
Divide by 12: x = 7 × 12
Simplify: x = 84