Respuesta :
Answer:
$18
Step-by-step explanation:
15*2=30
So we need to multiply 9.00 by 2 too!
9*2=18
Keep up the good work!
We know that
15 baseball cards cots $9.00
So in order to get 30 all we need to do is times what we know by 2
15x2 = 30
9 x 2 = 18
Therefore, 30 baseball cards will cost $18.00