If a wind turbine's blades reach 20 feet in diameter and makes 4 revolutions, how far would one blade travel from start to end?

Can anyone me with 32,33,36,37,and 40.

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

What value is a discontinuity of x squared plus 8 x plus 4, all over x squared minus x minus 6?