O professor de Matemática desafiou Marina a multiplicar de cabeça 2,745 por 100. Como Marina é uma aluna muito estudiosa, ela respondeu na hora que daria 274,5 e o professor lhe deu os parabéns. O que Marina
fez para calcular essa multiplicação de cabeça e tão rapidamente?

29 is the correct answer

step-by-step explanation:

the answer is simply just 6n add the two together as they have an n

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.