Construya la tabla de verdad para cada una de las siguientes proposiciones e identifica si es una tautología, contradicción y contingencia. a) ( ) ∨ (¬ ∨ )

b) ¬ ( ) ∨ ¬ ( ∨ )

c) ( ¬) ∨ ¬ ( ¬)

hiking down a winding trail.

step-by-step explanation:

this may not be at all, but i use the same website you're using for school, and if i'm stuck doing one of these i try to look for it on the section.

answer: 7 x 2/5 = 2.8 hours, is your answer. your welcome! : 3

step-by-step explanation: first work out how long it took to hose 1/7 of the lawn which is 2/5 hours. times that by 7 to get the whole lawn.

sorry i don't know the other answer. i didn't learn what a proportional relationship is.