The Laplace Transform of a Function F Is
A) $\mathcal { L } \{ f ( x ) \} = \int _ { 0 } ^ { \infty } e ^ { t } f ( t ) d t$

Multiple Choice

The Laplace transform of a function f is

A) $\mathcal { L } \{ f ( x ) \} = \int _ { 0 } ^ { \infty } e ^ { t } f ( t ) d t$
B) $\mathcal { L } \{ f ( x ) \} = \int _ { 0 } ^ { \infty } e ^ { - t } f ( t ) d t$
C) $\mathcal { L } \{ f ( x ) \} = \int _ { 0 } ^ { \infty } e ^ { s t } f ( t ) d t$
D) $\mathcal { L } \{ f ( x ) \} = \int _ { 0 } ^ { \infty } e ^ { - s t } f ( t ) d t$
E) $\mathcal { L } \{ f ( x ) \} = \int _ { 0 } ^ { s } e ^ { s t } f ( t ) d t$