Using quadratic formula
A teacher has determined that the number of students in her Trig class has increased over a 5-year period at a rate of r given by the equation 5r²+14r-3=0. find r
We got r=2
is this right?

Question

Using quadratic formula
A teacher has determined that the number  of students in her Trig class has increased over a 5-year period at a rate of r given by the equation 5r²+14r-3=0. find r
We got r=2
is this right?

harsha19111999 · Answer

Hey I told that the answer is 1/5 it might be possible that makes 1 student for 5 years

anonymous · Answer

1 in 5 or 1/5? 1/5 is a fifth of a student which cant be right

harsha19111999 · Answer

1 in 5 years

anonymous · Answer

wait i think i get it now.
it says RATE of R. not that R is no of student.
so fraction can be true

harsha19111999 · Answer

Yes

harsha19111999 · Answer

That is rate not student its rate of student

anonymous · Answer

hmm, ok

anonymous · Answer

to simplify, if the no of students was x before, then after the five year term the no. increases by 1/5 of x + x
hope this helped :)