Answer:
x =68
Step-by-step explanation:
The sum of the angles of a triangle are 180
37+75+x = 180
Combine like terms
112+x = 180
Subtract 112 from each side
112+x-112=180-112
x =68
The scientific notation:


Used:

Answer: (4 × 10⁸)² = 1.6 × 10¹⁷
U would put something like sin(45)