The product of 15 and the quantity 12 more than a number x

15x+180 is the required expression.

Step-by-step explanation:

Let the number be 'x'.

Quantity 12 is more than x is expressed as

x+12

For more than we would use addition.

Product of 15 and (x+12) is expressed as

= 15(x+12) ( for product we would use multiplication)

= 15x+ 15 × 12

= 15x+180

Hence, 15x+180 is the required expression.