The number 64 has the property that it is divisible by its units digit. How many whole numbers between 10 and 50 have this property?

Step-by-step explanation:

Let's call the numbers "tu", where t is the tens digit and u is the units digit.

We can solve this by the "brute force" method —  examining each number to see if it satisfies the conditions.

i dony know

step-by-step explanation:

none of the above.

for one of the equations to be used in the process, there has to be a term in the equation since squared is .

since there is only a term in the first equation, we cannot derive a from completing the square.

solving with completing the square