Answer:
$440
Step-by-step explanation:
First and foremost the financing activities hinted in the question are as follows:
Distribution of cash dividends declared in 2017 $ 48(outflow)
Payment to retire bonds $452(outflow)
Proceeds from the sale of treasury stock (cost: $52) $60(inflow)
net cash outflows from financing activities=-$48-$452+$60
net cash outflows from financing activities=-$440