Final answer:
To make the expressions equivalent, we need to find the value that, when multiplied by (4+), results in the sum of 32 and 72. The correct value that fills in the blank is 9.
Step-by-step explanation:
To make the expressions equivalent, we need to find the value that, when multiplied by (4+), results in the sum of 32 and 72. Let's solve the equation to find the value:
32 + 72 = _x(4+)
Adding 32 and 72, we get:
104 = _x(4+)
To find the value of _x, we can divide both sides of the equation by (4+):
104 ÷ (4+) = _x
Since (4+) means any number greater than or equal to 4, we can say that 104 divided by any number greater than or equal to 4 will give us the value _x. Therefore, the correct answer is d. 9.