HELP PLS I NEED HELP PLLLS Write an exponential function to represent the spread of Ben's social media post.

Write an exponential function to represent the spread of Carter's social media post.

Hector and alex traded video games. alex gave hector one fourth of his video games in exchange for 6 video games. then he sold 3 video games and gave 2 video games to his brother. alex ended up with 16 video games. how many video games did alex have when he started?

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

How do i simply this radical expression?