Which of the following equations is correctly calculated? \( -36+4=9 \) \( (-2)(-7)=-14 \) \( 4(12)=-48 \) \( 81 \div(-9)=-9 \)

Let's unravel these equations, shall we? The first equation, \(-36 + 4 = 9\), is quite the party crasher because it actually equals \(-32\)! As for the second one, \((-2)(-7) = -14\), that’s a twist too, since multiplying two negative numbers gives us a positive. In fact, it's \(14\), not \(-14\)! The third equation, \(4(12) = -48\), is off in the same way as the previous ones—it's actually \(48\)! Lastly, \(81 \div (-9) = -9\) is a fierce competitor and actually correct, as \(81\) divided by \(-9\) is indeed \(-9\)! So, the winner here is the last equation!