Como simplifica essa expressão: 5x*(2+6x-5y)+2y*(2+3y-4x):​

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

Write the expression as a single natural logarithm. 2 in a - 4 in y

How can you find the mean absolute deviation (mad) for this set of data?