Liam made 10 robots in five hours. In all, how many hours will you need to make 18 robots

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ab=9, and ac=12, find hc.

Lizette is training for a marathon. at 7: 00 she left her house and ran until 8: 30, then she walked until 11: 30. she covered a total distance of 18 miles. her running speed was six miles per hour faster than her walking speed. find her running and walking speeds in miles per hour.

If 3 3/4 lb. of candy costs 20.25 how much would 1lb. of candy cost