Answer:
D
Step-by-step explanation:
You first add 4 to all of the numbers giving you 7, 24, 41, and 49. Only choice D is a perfect square. for reference, 7*7=49
<span>x2 = 81 if and only if x = 9.
</span><span>this statement means
</span>x2 = 81 implies x = 9, and x = 9 implies x²=81
so the converse of <span>If x = 9, then x2 = 81 is </span><span>If x2 = 81, then x = 9</span>
