Answer:

Step-by-step explanation:

Adding 10 to both sides.


Adding
to both sides.


Dividing both sides by 10.


∴ 
Answer:
16
Step-by-step explanation:
2^4 is the same thing as 2*2*2*2*2. 2 times 2 is 4, times 2 is 8, times 2 again is 16.
C would equal 20. because 12 times its self plus 16 times its self equals 400. then I square 400 and got 20, which equals c