Answer:
a great tool for these is symbolab
Step-by-step explanation:
Answer:
108
Step-by-step explanation:
48/4 = 12 pens per box
12 x 9 = 108 pens in 9 boxes
What subject is it as I need a background to answer this question
Answer:

Step-by-step explanation:
So we know that:

To reflect across the <em>y-axis</em>, instead of x, use -x. Therefore:

Simplify:

And that's our answer :)