So, Jerome bought a total of 80 cards (8x10) out of which he gave out 30 cards (3x10) so he has 50 cards left. (80-30)
Answer:
30
Step-by-step explanation:
29 - 19 = 10 (difference)
triple 10 now:
10 x 3 = 30
Rectangle, triangle, and I believe square
