Answer:
The vertex of the function
is 
Step-by-step explanation:
I've graphed this on desmos for a visual
6 girls would need to join for the ratio to be the same
37 cards. 9 cards of every suit + 1 more card to guarantee the 10 cards by pigeonhole principle.
Can not be simplify
Step-by-step explanation:
#7 is the easiest one.
a + bi = -9 + 4i
see the expression on either side matches up so..
a = -9 and b = 4