Please help I need it

power of 10, add or subtract keep the power of 10

to multiply, coefficients and add the powers of 10

to divide you must divide the coefficients and subtract the powers of 10

b.my answer is b.

brainliest

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.