The Quarterly Cash Flows from Operations for Two Computer Companies

The quarterly cash flows from operations for two computer companies are as follows:
$\begin{array}{|l|c|c|c|c|c|}\hline \text { (in Millions) } & 2012 & 2012 & 2012 & 2012 & 2013 \\\hline & \mathrm{Q} 1 & \mathrm{Q} 2 & \mathrm{Q} 3 & \mathrm{Q} 4 & \mathrm{Q} 1 \\\hline \text { Firm A } & \$ 406.1 & \$ 204.2 & \$ 729.1 & \$ 440.2 & \$ 587.8 \\\hline \text { Firm B } & \$ 136.7 & \$ 243.1 & \$ 708.2 & (\$ 87.90) & (\$ 161.4) \\\hline\end{array}$
Required:
1)Explain why Firm B has more credit risk than Firm A.
2)Suppose that Firm B's cash flow was $200 million higher each quarter.Explain why Firm B might still be viewed as having higher credit risk than Firm A.