He comprado en el super 3 kilos de harina por 0.90€ ¿cuánto me costarían 7 kilos ?​

está bien fácil has 3 x 0.90

i used to know how to do this in 7th but i forget easily

step-by-step explanation:

3< x< 5

step-by-step explanation:

|x - 4| < 1

there are two solutions, one positive and one negative.   remember to flip the inequality when taking the negative solution

x-4 < 1       x-4 > -1

add 4 to each side

x-4+4 < 1+4       x-4+4 > -1+4

x< 5                 x> 3

3< x< 5