Answer:
a) Jenna's tax basis = $45,000 + ($13,000 - $10,000) = $48,000
loss allocation = $65,000
loss limited by her tax basis = $65,000 - $48,000 = $17,000
b) Jenna's at risk loss = $48,000 - $13,000 = $35,000
c) Jenna's loss limited by passive activity = $35,000 - $4,000 = $31,000