There are 28 days in february. there are 7 days in a week. how many weeks are there in february

Need ! give step by step solutions on how to solve number one \frac{9-2\sqrt{3} }{12+\sqrt{3} } number two x+4=\sqrt{13x-20} number three (domain and range) f(x)=2\sqrt[3]{x} +1

Abus travels 36 miles in 45 minutes. enter the number of miles the bus travels in 60 minutes at this rate.

How do you write something in scientific notation?