Respuesta :

gmany

Answer:

15 + 21 = 3(5 + 7)

Step-by-step explanation:

[tex]\text{The distributive property:}\ a(b+c)=ab+ac\\\\15=3\cdot5\\21=3\cdot7\\\\15+17=3\cdot5+3\cdot7=3\cdot(5+7)[/tex]