what’s this in standard form

Answer:
0.8
Step-by-step explanation:
Answer:
[tex] \longmapsto (4 \times {10}^{ - 1} ) + (4 \times {10}^{ - 1} ) \\ = \frac{4}{10} + \frac{4}{10} \\ = \frac{(4 + 4)}{10} \\ = \frac{8}{10} \\ = \boxed{8 \times {10}^{ - 1} }[/tex]