6th grade math help me please

Describe the 2 algebraic methods you can use to find the zeros of the function f(t)=-16t^2+400.

Tom travels between the two mile markers shown and then finds his average speed in miles per hour. select the three equations that represent this situation.

Larry wants to buy some carpeting for his living room. the length of the room is 4 times the width and the total area of the room is 16 square meters. what is the length of the living room