Is -5, 5, -5, 5, -5 an arithmetic sequence?

What is the pattern in the values as the exponents increase?

What is the value of x in the this question ?

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