Find the value of the missing angle. Pease help

F(x) = 1/x g(x)=x-4 can you evaluate (g*f)(0) ? why or why not?

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.

Perry observes the opposite parallel walls of a room in how many lines do the plains containing the walls intersect