Robin purchased 3 1⁄2 ounces of whole wheat cereal for $1.40. what is the cost per ounce?

Iwill make brain if you me correctly fill this out needs due today pls and send it back to me (click the link and you will get it)

The sum of two numbers is 12 and their difference is 18 what are the two numbers

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