What section of the color chart is used to calibrate brightness? Select the answer by clicking on the appropriate area of the chart

Invoicing clients, purchasing AV equipment and providing estimates are examples of which of the following types of work?
In order to run three cables inside a conduit, what is the maximum percentage of a conduit's internal cross- sectional area to be considered?
Invoicing clients, purchasing AV equipment and providing estimates are examples of which of the following types of work?
In a request for proposal (RFP) document, what would be the BEST place to find the overall expectations and contractual requirements for the project?