Which transformation will occur if y=x is replaced with y=x+2

Which of these numbers of simulations of an event would be most likely to produce results that are closest to those predicted by probability theory? 15, 20, 5, 10

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

Write the expression as a single natural logarithm. 2 in a - 4 in y