Answer:
5
Step-by-step explanation:
Cause you can actually get multiple different answeres which you can make a statistical question on
From the Pythagorean Theorem, we know that a^2+b^2=c^2
28^2+21^2=(5x)^2
784+441=25x^2
1225=25x^2
49=x^2
x=7
The length of the hypotenuse would be 35m.
I might not know the answer to this question but I hope you find one