Aprofessional rower can paddle 320 miles upstream in 10 hours and downstream 320 miles in 5 hours. how fast is the current? (don't forget your units)

Scrub a dub toothbrushes are $4.00 each. there is a 10% discount, but there is also a 6% sales tax after the discount is applied. what is the new price after tax? round to the nearest penny

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

What is the perimeter of a rectangular building that is 80 feet wide and 140 feet deep?