Answer:

1. n - 9

2. 4x + 7

3. 2B

4. 2a + 8

5. (x/3) - 5

Step-by-step explanation:

1. The algebraic expression for "a number n minus 9" is n - 9.

2. The algebraic expression for "4 times a number x plus 7" is 4x + 7.

3. The algebraic expression for "The product of 2 and B" is 2B.

4. The algebraic expression for "twice a number a added to 8" is 2a + 8.

5. The algebraic expression for "a number x divided by 3 decreased by 5" is (x/3) - 5.

Please note that these solutions are based on the given information and represent the algebraic expressions for the given statements.