-(7) to the power of 4 Which expression shows the power correctly written in expanded
notation?
-7 x -7 x -7 x -7
-7 x 7 x 7 x 7
-4 x -4 x -4 x -4 x -4 x -4 x -4
-4 x 4 x 4 x 4 x 4 x 4 x 4

the first one is correct

Step-by-step explanation:

this is the same way as writing 7 to the power of four, but all of the sevens are negative in your case

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.