To cut costs while maintaining the quality of education, one of the board members of a school district proposed to have the number of teachers vary directly as the number of students in a classroom. she proposed 12 teachers to teach a student body of 228 students. how many teachers would be needed if the school grows to 399 students?
a. 19 teachers
b. 21 teachers
c. 20 teachers
d. 20.9 teachers

21 teacher

Step-by-step explanation:

cross multiply

12/228 = x/399

12(399) = 228x

4788 = 228x

now divide both sides by 228 to find x

4788/228 = 228x/228

21 = x

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