Is 12 a prime or composite? (can someone clearly explain what a prime and composite are? )

X+ y = 5 ; x - y =3 solve using linear combination

Find the value of x. give reasons to justify your solutions! c ∈ ae

Talia grouped the terms and factored out the gcf of the groups of the polynomial 15x2 – 3x – 20x + 4. her work is shown below. (15x2 – 3x) + (–20x + 4) 3x(5x – 1) + 4(–5x + 1) talia noticed that she does not have a common factor. what should she do?