How do you find the percent of a number?

Under normal conditions, 1.5 feet of snow will melt into 2 inches of water. during a winter season high in the mountains, 301 feet of snow fell. how many inches of water will there be when the snow melts?

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

Pls the last one and it has to be like number 6