Set up, but do not evaluate, the integral that represents the length of the curve given by x = t + cos (t), y = t -sin (t) over the interval 0 ≤ t ≤ 2π.

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?

Me with geometry ! in this figure, bc is a perpendicular bisects of kj. dm is the angle bisects of bdj. what is the measure of bdm? •60° •90° •30° •45°

What is r i 4.5+10r=-6.5 with work pls