Evaluate the expression.
a) 28 - (v144)

  16

Step-by-step explanation:

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It works well to use the usual math symbols. The equation editor can properly format math expressions. A square root can also be properly indicated several other ways:

  sqrt(144)

  144^(1/2) . . . . . . the half power of a number is its square root

  √144

12r - 8 - 12

you have to combine like terms. below i have bolded the like terms:

12r - 8 - 12

together it combines to:

12r - 20

hope this !