the answer is the first one but i have no idea how to get that answer. can someone please explain i will be giving out brainliest answer

The area will be:

square units    

Step-by-step explanation:

Using the formula to calculate the area of regular octagon side

where 's' is the length of one side.

Given the length of one side = s = 30 inches

substituting s = 30 inches in the formula

square units    

Therefore, the area will be:

square units    

step-by-step explanation:

we can use this expression to calculate the energy gain as a particle moves with a field or the energy loss as it moves against it. (note that it is also used to define the electron-volt, a unit of energy equal to that gained by an electron as it falls through a pd of 1 v, i.e. w = 1 ev = 1.6 10-19 c 1 v = 1.6 10-19j).in fact this expression is really nothing more than the statement that potential is the potential energy per unit charge. in this case, v= w/qis simply stating that the change in potential energy(or work done) per unit charge is equal to the change in potential (or potential difference), v.student questions: uniform electric fields2electron beamcathode+5 kvanode0 v