2.1 x 2.1 -0.9 x 0.9
a)
2.1 -0.9

3.6

2.1(2.1) - 0.9(0.9)

4.41 - 0.81 = 3.6

all teachers

step-by-step explanation:

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.