Step-by-step explanation:
As the problem said, you need to submit a picture of your own work, but I can help nevertheless.
Blank 1:
[tex]\tan 70=\frac{x}{300}\\x=300\tan70 \approx \boxed{824.24}[/tex]
Blank 2:
[tex]\tan 53=\frac{x}{300}\\x=300\tan53 \approx \boxed{398.11}[/tex]
Blank 3:
[tex]300\tan(70)-300\tan(53)\approx\boxed{426.13}[/tex]
