Final answer:
The expression equivalent to ab-3, assuming a is 0 and B is not 0, simplifies to -3 since multiplication by zero results in zero.
Step-by-step explanation:
The question asks which expression is equivalent to ab-3 given that a is 0 and B is not equal to 0. To solve this, we need to substitute the value of a into the expression.
Since a equals 0, the multiplication part of the expression ab will result in 0 because anything multiplied by 0 is 0. The expression ab-3 then simplifies to 0*B - 3, which is 0 - 3 because any number multiplied by 0 is 0. Lastly, the equation simplifies to -3 because 0 minus 3 equals negative three (-3).