The Surface comes with two types of covers: the type cover and ________

Which formula contains a mixed cell reference?

A. =(A6+A7)*0.20 B. =($A$6+A7)*0.20 C. =($A$6+$A$7)*0.20 D. =($A6+$A$7)*0.20

In 1987, the ____________ was introduced with an external EasyDrive hard disk with 60 MB of storage.?

Fill in the blank(s) with the appropriate word(s).