how much of a radioactive kind of protactinium will be left after 28 hours if you start with 672 grams and the half-life is 7 hours?

Describe the relationship between the angles of similar triangles and the sides of similar triangles

Write an equation of the line that passes through 9,2 and is parallel to the line y=5/3x+9

Asandwich shop has 18 tables. each table seats up to 4 people. to find the greatest number of people that can be seated, you can solve p4 ≤ 18. which step is the best way to solve the inequality? plz asap i repeat plz