What is the exponent on 10 when you write 0.0000638 in scientific notation?

What is the product of the radical expression. (7-2square root) (8+2 square root)

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .

Liz is shipping a package to her friend. the maximum weight of a medium flat-rate box is 20 pounds, including the box which weighs 6 ounces. write and solve an inequality to describe the possible weight in pounds, w, of the contents that liz will ship to her friend if she must use a medium flat-rate box. use the drop-down menus to explain your answer.