Write a comparison for 2/8 & 3/10

Which statement most accurately describe why the division property of exponents does not apply to the expression (-8)^2/(-3)^4

If i have a 24 in loaf of bread and i cut it into two pieces one 9 in how long was the other

If a 36 inch yardstick casts a 21 foot shadow, how tall is a building whose shadow is 168 feet? what is the scale factor