B= tan 60° . cos²47° + sin²47° . cot 30°

The mean of a set of data is -3.82 and its standard deviation is 2.31. find the z score for a value of 3.99.

How far could you drive on 50 gallons of gas

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