What is 183 million in scientific notation?

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

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

Which equation shows the quadratic formula used correctly to solve 5x2 + 3x -4 0 for x? cos -3+ v (3) 2-4() 2(5) 3+ |(3)² +4() 205) 3+ (3) 2-4() -3+ v (3)² +4()