Question

I need help with this question

Answer 1

The sequence of keystrokes directs the calculator to compute

$\dfrac{5\cdot 10^{-9}}{2\cdot 10^4}=\dfrac{5}{2}\cdot 10^{(-9-4)}=2.5\cdot 10^{-13}$

The display will read ...

... A) 2.5E-13

_____

You can enter these keystrokes on your calculator and get the answer immediately.

___

Actually, it is very likely Samuel's calculator displayed 2E4, since the key for "=" has not been pressed.