Calculate Grove's 2018 cash from investing activities.

Below is income statement and balance sheet data for Grove Analytics. ($ in millions) Income statement 12/31/2018 Revenue 230 Operating expenses 68 Depreciation 20 Stock based compensation 13 Operating profit 129 Interest expense 5 Taxes 31 Net income 93 Balance sheet 12/31/2017 12/31/2018 Cash 50 Not provided Accounts receivable 20 25 Inventory 15 18 PP&E 30 40 Total assets 115 83 Accounts payable 8 11 Short term debt 20 22 Long term debt 48 60 Treasury stock (30) (40) Common stock & APIC 25 40 Retained earnings 44 95 Total liabilities & equity 115 188