The range has a minimum because this is a second order equation with a constant positive acceleration.
The minimum can be seen easiest by putting the equation into vertex form
y=x^2+2x-1
y+1=x^2+2x
y+1+1=x^2+2x+1
y+2=(x+1)^2
y=(x+1)^2-2 so the vertex is at the point (-1, -2), and this is the absolute minimum value for y or the range. As x approaches positive or negative infinity, y approaches positive infinity:
The final grade of fran can be calculated
by multiplying the corresponding percentage of his average homework, quizzes
and tests, then sum it up and it is now the final grade of fran.
Final grade = (0.10 x 92) + ( 0.20 x 68) +
(0.70 x 81)