The expression -50x + 100 represents the balance, in dollars, of the bank account after x months. What is the rate of change in dollars per month, of the bank account balance?

Step-by-step explanation:

In the month the balance will be which is . In the month, the balance will be which is . In the month, the balance will be which is .

We can see that for every increase of month, the balance of the bank account will decrease by .

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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: