How many marbles do you need to be able to arrange them into the shape of an equilateral triangle with 75 rows

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

Two blends of tea are mixed to make a blend that will be sold at the fair. black tea sells for $2.20 per pound and orange pekoe tea sells for $3.00 per pound. how much of each should be used to obtain a 4lb blend selling for $2.50 per pound?

How do i do this activity, is appreciated