Ineed a the answer ! geometry is hard

36

Step-by-step explanation:

Triangle FED and Triangle AEC are similar.

That means, the ratio of corresponding sides are equal. Thus we can say:

Also, since EC is 39 and D is the midpoint, ED and DC are half of that. Hence ED = 39/2 = 19.5

Now we can use the ratio to solve for AC:

Hence, AC = 36

i believe your answer is 99.7% of 7-year-old children are between 46.6 inches and 49.5 inches tall.