Answers:
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1)  The answer is:  [B]:  " 40 " .
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2) The answer is:  [B]:  " 7.5" .
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Step-by-step explanation:
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1)  Given: " w − 8 = 32 " ; Solve for "w" ; 
 w − 8 = 32 ; 
Add "8" to each side of the equation; to isolate "w" on one side of the equation; and to solve for "w" ;
 w − 8 + 8 = 32 + 8 ;
 
 to get:
 
 w = 40 ; which is: Answer choice: [B]:  "40" .
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2)  Given: " n + 8.7 = 16.2 " ; Solve for "n" ;
 n + 8.7 = 16.2 ; 
Subtract "8.7" from EACH SIDE of the equation; to isolate "n" on one side of the equation; and to solve for "n" ; 
 n + 8.7 − 8.7 = 16.2 − 8.7 ; 
to get: n = 7.5 ; which is: Answer choice: [B]: " 7.5 " .
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