When can you pull a number out from under the radical?

You can take out anything that is a perfect square

Step-by-step explanation:

For Example, a perfect square would be considered

64

36

to get a perfect square you multiply a number by itself

for example,

8 x 8 = 64

6 x 6 = 36

$25

step-by-step explanation:

25 - 4.50 = 20.5

20.5 / 2 = 10.25

10.25 + 10 = 20.25

20.25 - 12.50 = 7.75

therefore the answer is $25 as shown as the first number.