Please help me thank you!!

sqrt 7

Step-by-step explanation:

The formula is a^2+b^2=c^2, where a and b are the "legs" of the traingle, and c is the "longest" side of the traingle. In this case its:

3^2+b^2=4^2

=9+b^2=16

=b^2=7

=sqrt 7

step-by-step explanation:

no, her answer is not correct.   we square the lengths of all sides and then determine whether the pythagorean theorem holds here:

9² + 15² = 306.   this is not equal to the square of the longest side ( that square being 395.   answer c is correct.