12^2-(9-7)^3+6=12^2-(blank)+6 what number is blank?

Complete the standard form of the equation that represents the quadratic relationship displayed above, where a, b, and c are rational numbers.

In the following diagram it is given that dec, ab || dc, ad || eb, and ad is congruent to bc. a)why isn't abc a parallelogram even though it has a pair of parallel sides and a pair of congruent sides b)explain why be must be congruent to bc. further explain what type of triangle this makes triangle abc and what it tells you about angle 1 and angle 2c) finally why must angle 3 be congruent to angle 1? further, explain why we know that angle 3 is congruent to angle 2

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16