Respuesta :

XBadeX

We must multiply 3 by each number given in parentheses:

3 . 1 = 3

3 . -4 = -12

3 . 5 = 15

3 . -7 = -21

Let's write them all in parentheses in order:

[ 3 , -12 , 15 , -21 ]

I hope I got it right, I'm trying to improve my English a little :)

I will be glad if you choose the best and give a heart :)

Greetings from Turkey:)

#XBadeX