Just the answers to 21 22 and 23

Find and simplify the difference of the golden ratio and its multiplicative inverse

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

1yd 1 ft = 1 1/12 1 1/3 1 1/2 1 1/6