Answer
For both SN1 and E1, the first step is that Br- leaves. Next, for SN1, ethanol attacks, get deprotonated, and forms a substitution product. For E1, an adjacent carbon loses a proton and forms another bond with the C+ (so there is a double bond). A more substituted double bond is favored, so the H+ lost should be from a carbon that can form a more substituted double bond with the C+.
Work Step by Step
See image.
