Answer:
10x^{3}[/tex]
Step-by-step explanation:

=10·10·10
=1000
False, an inscribed angle is not formed by radii.
The fractions you're given can be simplified down, so you get (12 ÷ 3) 4 hours on Monday, (21 ÷ 3) 7 hours on Tuesday, and (22 ÷ 3) 7 1/3 hours on Wednesday. You can now add these up and get your answer as 18 1/3 hours, or 18.33.
I hope this helps!