Let x, y ⊂ z and x, y ∈ z let a = (x\{x}) ∪ {x}. a) prove or disprove: a ⊆ x b) prove or disprove: x ⊆ a 4 c) prove or disprove: p(x ∪ y ) ⊆ p(x) ∪ p(y ) ∪ p(x ∩ y ) d) prove or disprove: p(x) ∪ p(y ) ∪ p(x ∩ y ) ⊆ p(x ∪ y )

Cody started biking to the park traveling 15 mph, after some time the bike got a flat so cody walked the rest of the way, traveling 4 mph. if the total trip to the park took 6 hours and it was 46 miles away, how long did cody travel at each speed? solve using rate times time= distance