724 rounded to the nearest ten

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

Which exponential function has an initial value of 2? f(x) = 2(3x) f(x) = 3(2x)

If a sprinkler waters 1 over 12 of a lawn in 1 over 2 hour, how much time will it take to water the entire lawn? (5 points) 10 hours 6 hours 1 over 6 hour 7 over 12 hour