True or false given relation r1, where r1 contains n1 tuples and a is an attribute of r1, the minimum possible size in tuples of σa=5(r1)

Which is a benefit of peer-to-peer networking? easy to add or remove devices main server has a fast processor more reliable than a client/server network same software versions on all computers

Write lines of verse that rhyme to remember the following information: acid rain is a type of air pollution caused by chemicals in the air.

Jason is working on a microsoft excel worksheet and he wants to create a print preview shortcut. his teacher asks him to access the customization option to create the new shortcut. which two tabs should jason select to place the print preview shortcut on the worksheet toolbar? a. new tab (custom) and new group (custom) b. new file tab (custom) and new tab (custom) c. new custom group and new command d. new custom tab and new command