Can people plz help me on this work that i don't get? just do 55 to 63 plz

In which figure is de bc ? a. figure 1 b. figure 2 c. figure 3 d. figure 4

You dug a hole that was 8 feet deep. after taking a short break, you dug down 3 more feet in the same hole. when finished digging, a tractor accidentally filled the hole with 4 feet of dirt. how deep is your hole now?

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.