Which equation is correct regarding the measure of ∠1?

In the coordinate plan (-6,9) b (3,9) c (3,3) def is shown in the coordinate plan below

Pam buys a sleeve of ball bearings for her skateboard. each of the bearings is 1 1/5 inches wide. the sleeve is 9 3/5 inches long. how many ball bearings are in the sleeve? show your work.

Write the expression in complete factored form. 5n_(c - 3) - n(c - 3) =