explain how you know the number of decimal places that should be in the product of a number with decimal places to the hundreths multiplied by a number with decimal places to the tenths

Select a graph that have an equation with a < 0

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?

Last one and the bottom answer choice is y=(x-4)^2+1 you guys!