If the force experienced by a positively charged balloon is 2.7 newtons and the electric field strength is 7.8 × 105 newtons/coulomb, what is the magnitude of the charge on the balloon?

If you're careful about units, then you can do just about anything with
the two given quantities, and the answer will fall out on the desk right
there in front of you:
 
                                 (2.7 newtons) / (7.8x 10⁵ newtons/coulomb)

Divide numerator
and denominator
by (newton), and
you have                  (2.7 coulomb) / (7.8 x 10⁵)  =  3.46 x 10⁻⁶ coulomb

                                                                            =  3.46 micro-coulombs

Notice that you didn't describe the direction of the force on the balloon, so
the flavor of the charge on it doesn't matter. A negatively charged balloon
with 3.46 microcoulombs on it would feel exactly the same force, but it would
be in the other direction.

Iassume the answer is 75 feet. inwards to outwards rather than outwards to inwards. probably be 75.hachures are stokes drawn in direction of the steepest slope. a series of short parallel lines drawn on a map to indicate topographic relief. it is actually called hachures on contour lines. the small marks in the center of the feature are called hachures.observe the picture attached