Estimale by en unding off to the nearest 100 9.487 +519
500+500 (nearest 100)
(490 + 510) nearest 10 Joao
b 4.699 - 1207 - 4700 - 1200 - 3500
Estimate the following by
sounding off to the
nearest
a 1928 +3469
b) 2415-2405
1000+3000 = 4000 (o 3222 - 1999
gave​

Astuntman jumping off a 20-m-high building is modeled by the equation h=20-5t^2, where t is the same in seconds. a high-speed camera is ready to film him between 15m and 10m above the ground. for which interval of time should the camera film him?

Hi, can anyone show me how to do this problem? 100 points for this. in advance

Apinhole camera is made out of a light-tight box with a piece of film attached to one side and pinhole on the opposite side. the optimum diameter d(in millimeters) of the pinhole can be modeled by d=1.9[ (5.5 x 10^-4) l) ] ^1/2, where l is the length of the camera box (in millimeters). what is the optimum diameter for a pinhole camera if the camera box has a length of 10 centimeters