Evaluate the expression when b= -4 and x= 2. b-7x

Step-by-step explanation:

b  - 7x = (-4) - 7*2

          = -4 - 14      {both numbers have same sign, so add and put the - sign for the result}

         = -18

step-by-step :

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.