Final answer:
The correct expressions are: 2a + 7, c/d - 10, and a^3 + 6.
Step-by-step explanation:
The correct expressions described in words are:
- 2a + 7: the sum of twice a and seven
- c/d - 10: ten more than the quotient of c and d
- a^3 + 6: a raised to the third power, then increased by six
In option A, the expression represents the sum of twice the value of a and seven. In option C, the expression represents ten more than the quotient of c and d. In option D, the expression represents a raised to the third power, then increased by six.