The price of a 7​-minute phone call is ​$1.05. What is the price of a 12​-minute phone​ call?

$1.80

Step-by-step explanation:

7min -> $1.05

1 mIn -> $1.05 ÷ 7

         = $0.15

12min-> $0.15 x 12

          = $1.80

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