U right 9.88•10 in standard form like 98800000000.
The answer is 16. 1^2 is 1, 2^2 is 4, 3^2 is 9, and 4^2 would be 16.
I hope this helps you
Circumference =2.pi.r
60=2.3,14.r
r=30/3,14
Arc Length = 140/360.2.3,14.30/3,14
Arc Length =70/3
D=1/2.g.t^2,
where D=distance the object has fallen, g=9.81m/sec^2(being the pull of gravity), t=time elapsed in seconds.