Answer:
Step-by-step explanation:
a whole number such as 6 can be rewritten as 6/1
Number of ways the second grade students can sit on the first row is 5! = 5P5
Number of ways 15 first grade students can sit in the remaining 20 seats is 20P15
Therefore, required number of ways is 5P5 * 20P15. (option B)
I'm sure you already know the axis which is x= -2. The vertex is (-2,-9). You can use the graph or solve to find the vertex. I hope this helpful.
<h2><em>3, 3/1. Only 2 ways to write it.</em></h2>