Answer:
Convex, since none of the angles are greater than 180°
90
Step-by-step explanation:
y=2x-1
y= 6x-1-4x
3428
So 19 people can fit is 70 ft^2, then 3428ppl can fit.
Yes, they do
Because
6+8=14>9
6+9=15>8
8+9=17>6