The answer to which situation is best estimated by-7?
A The temperature falls 1.9°F from 4.3°F.
B A hot-air balloon rises 4.1 meters from the ground
and then rises 2.3 meters more.
C A submarine goes 3.8 feet below the surface of the
ocean and then goes 2.5 feet farther down.
D The amount of money Sarah has after she buys milk
for $3.85 and bread for $2.45.

I think it is C

Step-by-step explanation:

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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: