Help me with this please

If x varies directly as y, and x = 7.5 when y = 10, find x when y = 4

What is the simplified form of 400x100 ? o 200x10 o 200x50 0 20x10 • 20x50

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?