Find the zeros of the function and describe the behavior of the graph at each zero. 1. f(x) = x^3 - 8x^2 + 16x
2. g(x)= x^3 - x^2 - 25x + 25
3. f(x)= 9x^4 - 90x^2 + 16

Lizette is training for a marathon. at 7: 00 she left her house and ran until 8: 30, then she walked until 11: 30. she covered a total distance of 18 miles. her running speed was six miles per hour faster than her walking speed. find her running and walking speeds in miles per hour.