Scientific Notation/Radicals/Pythagorean Theorem Review

Question 1: Simplify square root(490x⁷y¹⁰)

Question 2: Find the value of x that makes 2square root(10x)=10square root(6)

Question 3: One mode of transportation travels at 3.2 x 10² miles per hour. A second mode of transportation travels 1.6 x 10 miles per hour. How much faster is the first mode of transportation than the second?

Question 4: Do the side lengths 5, 8, and square root(89) form a right triangle?

Question 5: Which of the following numbers is in scientific notation?