(1) Multiply:  (8 + c)(7 * d)

Do the multiplications in the following order:  (8 * 7) + (8 * d) + (c * 7) + (c * d).
This simplifies to 56 + 8d + 7c + cd.

(2) Multiply:  (2 + m)(m + 9)

Do the multiplications in the following order:  (2 * m) + (2 * 9) + (m * m) + (m * 9).
This simplifies to 2m + 18 + m + 9m, which simplifies to m + 11m + 18.

(3) Multiply:  (12 + h)(p + t)

Do the multiplications in the following order:  (12 * p) + (12 * t) + (h * p) + (h * t).
This simplifies to 12p + 12t + hp + ht.