Looking for the equivalent of the expression. I'm able to simplify but not able to find the equivalent out the answers provided.

The pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section

Parabolas y=−2x^2 and y=2x^2 +k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.

Grace paid $1.70 for 5 ounces of candy. how much did she pay for 24 ounces?