Hey i’ll give brainliest please help

Which of the following statement about pascal's triangle are true?

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

Handsome jack is buying a pony made of diamonds. the price of the pony is p dollars, and jack also has to pay a 25% diamond pony tax. which of the following expressions could represent how much jack pays in total for the pony?