Please help!! i will give brainilest

How can you construct perpendicular lines and prove theorems about perpendicular lines

Write the factored form of this trinomial 9x^2+18x-7

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?