What is this? My friend said you gotta get Twitter, I don't have Twitter. (It was his profile on discord)

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

What is the equation of a line passing through (-6,5) and having a slope of 1/3

In 1995 america online had about 3000000 users over the next decade users are expected to increase from a few million to the tens of millions suppose the number of users increased by 150% by the year 2000 how many users will there be in the year 2000