75% of students were boys. there 18 boys in the class wht is the total number of students
1 answer:
You might be interested in
Answer:
Step-by-step explanation:
we have
This is a vertical parabola open downward (the leading coefficient is negative)
The vertex is a maximum
The vertex is the point (h,k)
The range of the function is the interval (-∞,k]
so
Convert the quadratic equation in vertex form
Factor -1 leading coefficient
Complete the square
Rewrite as perfect squares
The vertex is the point (-1,4)
therefore
The range is