Rectangular box formed when each column meet​

What key should you press and hold to select and open multiple files at one time? enter alt control esc

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

(, urgent need): how do i change my username