³√9³ x √30²

I'm so stuck please help me!

What is the number 321,000,000 in scientific notation? also what is the number? ?

Answer this two poles, ab and ed, are fixed to the ground with the of ropes ac and ec, as shown: two right triangles abc and edc have a common vertex c. angle abc and edc are right angles. ab is labeled 13 feet, ac is labeled 15 feet, ec is labeled 10 feet, and ed is labeled 4 feet.what is the approximate distance, in feet, between the two poles? 11.14 feet16.65 feet14.35 feet15.59 feet

The area of each triangle is 7 square units. the surface area of the triangular prism is