Find the diameter and the
circumference of the circle
below: r= 8cm
8 cm
What is the circumference?

Step-by-step explanation:

The diameter is twice the radius:

  d = 2r = 2(8 cm)

  d = 16 cm

The diameter is 16 cm.

__

The circumference is pi times the diameter.

  C = πd

  C = π(16 cm)

  C = 16π cm ≈ 50.27 cm

The circumference is 16π cm, about 50.27 cm.

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: