How many different committees of 4 people can be chosen from a group of 21?

Complete the statements about the system of linear equation respresented by the tables the equation respented the left table is

An equation of the line tangent to y=x^3+3x^2+2 at its point of inflection is

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