What is the vertex of the function?

f(x)=x2−4x−7

(-2, 11)

(2, 0)

(0, -7)

(2, -11)

mr. flanders’ class sold 47 doughnuts and   mr. rodriquez’s class sold 38 cartons of milk

step-by-step explanation:

let x be the number of doughnuts sold by mr. flanders’ class and y be the number of cartons sold by mr. rodriquez’s class.

1. together, the classes sold 85 items, then

x+y=85.

2. both classes earn earned $104.49 for their school. if doughnuts were sold for $1.35 each, then x doughnuts costed $1.35x. if cartons of milk were sold for $1.08 each, then y cartons costed $1.08y. hence,

1.35x+1.08y=104.49.

3. solve the system of two equations:

765238725478629038640962136509762139056074

step-by-step explanation:

64087235609746097215074621039754021037

x = 12

y = 1

for the points!