Help me remember why √︎(x+3)^2 cannot be brought out of the radicand? My brain died. Is it because it's addition?

I thought the parenthesis and square allowed it to move out of the radicand.

There are 15 plates and each plate is either 7 or 12 inches diameter. which systems of equations do you use to find the number of 7 inch plates, x and 12 inch plates, y

Jessica and martha each have a bag of cookies with unequal quantities. they have 30 cookies total between the two of them. each of them ate 6 cookies from their bag. the product of the number of cookies left in each bag is not more than 80. how many more cookies will jessica have martha? if x represents the number of cookies jessica started with, complete the statements below.the inequality that describes the relationship between the number of cookies each one of them has is x^2 - x +224 > = 0.jessica has at least cookies more than martha.

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?