Donkey Kong is rolling cylindrical barrels of different sizes at Mario.
The Circumference of the bottom of the
barrel is 40.84067
How high must Mario jump to get over the
barrel?
Be careful...jump too high and the oil fire
might get you.

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

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

Atourist boat is used for sightseeing in a nearby river. the boat travels 2.4 miles downstream and in the same amount of time, it travels 1.8 miles upstream. if the boat travels at an average speed of 21 miles per hour in the still water, find the current of the river.