Cannonballs are stacked in a pyramid shape with a triangular base of 5 cannonballs in a side. how many cannonballs in all are in the stack

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

If f(x)= sqrt4x+9+2, which inequality can be used to find the domain of f(x)?

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1