Which shows the correct simplification of product of powers? 78 · 7-4 = 78· (–4) = 7–32
78 · 7–4 = 78 ÷ (–4) = 7–2
78 · 7–4 = 78 + (–4) = 74
78 · 7–4 = 78 - (–4) = 712

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:

but which class are u may know that first

you can use a^2+ b^2=c^2