A single discount equivalent to a successive discount of 18% and 12% is ? A) 30% B) 72.16%
C) 25% D) 27.84%

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answer: first option i.e. 'a' is correct.

step-by-step explanation:

since we have given that

number of minutes to wrap a small gift box = 4 minutes

we need to find the number of gifts to be wrapped in 5 minutes

since there is a direct variation, as the number of minutes will increase with   number of gifts to be wrapped.

so, let the number of gifts to be wrapped in 5 minutes be x.

so, it becomes,

hence, first option 'a'   is correct.

you have to find the same variables -3n - 5n so this would be -3n +(-5n) which equals -9n

well, because the $0.25 is an added cost depending on how many minutes, the answer would be y = 30 + 0.25x.