The formula for the area of a circle is a = πr^2. which equation shows the formula in terms of r?

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

Kayla made observations about the sellin price of a new brand of coffee that sold in the three different sized bags she recorded those observations in the following table 6 is $2.10 8 is $2.80 and 16 is to $5.60 use the relationship to predict the cost of a 20oz bag of coffee.

Iknow the answer but the calculator doesn't seem to give the right one