how many outfits are possible with 5 pairs of jeans, 8 t-shirts, and 2 pairs of shoes?

80 outfits are possible. Each outfit uses:

• 1 of the 5 pairs of jeans
• 1 of the 8 t‑shirts
• 1 of the 2 pairs of shoes

So you multiply the choices:
5×8×2=805\times 8\times 2=805×8×2=80 different outfits.