Write a mathmatical proof showing the algebraic equivalency of (2x)(3y)(4z) = 24xyz

Which of the following are accepted without proof in a logical system? check all that apply.

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

Megan is making bracelets to sell to earn money for the local animal shelter. it takes her 1/4 hour to pick out all the beads and 1/10 hour to string them.this week, she only has 5 1/4 hours to make bracelets. how many bracelets will megan be able to make?