Extracts from the balance sheet of Brigham Inc. as at January $1,2023$ appear below. Estimate the capex for the period.

Beginning PP&E $($net$)$

$100$

Asset bought $($capex$)$

$???$

Asset sold

$20$

Depreciation

$5$

Ending PP&E $($net$)$

$110$

Capex $($$$)$:

What is Capex?