an electron with a charge of -1.6 × 10-19 coulombs experiences a field of 1.4 × 105 newtons/coulomb. what is the magnitude of the electric force on this electron due to this field?

a 1.6 × 10-3 newtons
b 1.4 × 1024 newtons
c 2.2 × 10-14newtons
d 7.4 × 10-13newtons
e 4.5 × 1014 newtons

Relax.  Everything's under control.
If you use up all your exclamation points now, then
you won't have any left when you really need one.

          (1.4 x 10⁵ newton/coulomb) x (-1.6 x 10⁻¹⁹ coulomb)

     =    (1.4 x 10⁵  x  -1.6 x 10⁻¹⁹)  newton-coulomb/coulomb

     =    - (1.4 x 1.6) x 10⁵⁻¹⁹  newton

     =          - 2.24 x 10⁻¹⁴  newton