The first answer is correct
Pyhtaorean theorem says a² + b² = c²
a² + 7² = 25²
a² + 49 = 625; subtract 49 from both sides
a² = 576; square root both sides
a = 24
The perimeter is the distance around the figure, so 7 + 24 + 25 or 56
The rule is that if multiplying with powers you will add the m power to the n power and then that will be your answer .
False positives are positive results from the test of a non-infected person, which happens 100-97=3% of the time, choice C.