If a number is added to twice its square, the result is 6

Hello :

This number is : x

you have  : x + 2x² = 6

2x² + x -6 = 0

Δ = b² -4ac          a = 2  ,  b = 1  ,  c = 6

Δ = 1² - 4(2)(6) = 49 = 7²

X1 = (- 1 +7)/4  = 3/2

X2 = (-1-7)/4 = -2

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:

do i do it on a graph?

step-by-step explanation: