Tìm giá trị nhỏ nhất 1/A=x^2+6x+15

2/B=x^2-10x+20

3/C=4x^2-12x+15

4/D=9x^2-12+1

5/E=x^2+4x

6/F=x^2-20x

7/G=4x^2-20x

Toán 9 ạ

a = 11 : 4

b = 38

c = 1 for every 6

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:

the equation cos(35) =a/25 can be used to find the length of bc what is the length of bc? round to the nearest tenth

step-by-step explanation: