Express the number in scientific notation. 780,000,000 a) .78 × 109 b) .78 × 10-9 c) 7.8 × 108 d) 7.8 × 10-8

There were 816 people at a concert when a band started to play. after each song, only half the people stayed to hear the next song. how many people were left at the concert after x songs? write a function to represent this scenario.

Asequence is defined recursively using the formula f(n + 1) =f(n) - 5. which sequence could be

Which number completes the inequality? 2/3 < _ < 7/9