An object falls from a height of 400 feet. its height, h, in feet is given by the equation h=-16t^2+400 , where t is the time in seconds the object has fallen. how many seconds will it take for the object to reach the ground?

a.
1/5
b.
5
c.
20
d.
25

Adj has a total of 1075 dance and rock songs on her system. the dance selection is 4 times the size of the rock selection. write a system of equations to represent the situation.

At the "no mutants allowed" country farm, every sheep has 4 legs, every chicken has two legs, and all animals have only 1 head. asked to count how many sheep and chicken are in the fields, a farm boy reports back that there are 140 feet and 50 heads. how many sheep and chicken are there? there are sheep and chicken at the farm.

Identify the initial amount a and the growth factor b in the exponential function. a(x)=680*4.3^x