An electric filter purifies air at the rate of 35 liters per minute and uses energy at the rate of 0.8 joules per minute. it also purifies water at the rate of 25 liters per minute and uses energy at the rate of 1.3 joules per minute. the filter is expected to purify more than 1000 liters of air and water while using less than 170 joules of energy. let a denote the number of minutes it spends purifying air and w the number of minutes it spends purifying water.

Write an inequality that represents the condition based on the number of liters of air and water.

35A+25W>1000

and the following inequality represents the condition based on the number of Joules of energy:

0.8A+1.3W<170

Step-by-step explanation:

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: