Comparing fractions by finding a common denominator, Please put the steps in order for me

Use set builder notation to represent the following set: { -3, -2, -1, 0}

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76

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