Form the intersection for the following sets. r = {10, 15, 20} s = {20, 25} r ∩ s = a.{ } b.{10, 15, 25} c.{20} d.{10, 15, 20, 25}

Jessa bought a yoyo from a company that claims that, with each retraction, the string rolls up by 60% of the original length. she sets up a tape measure and throws the yoyo 3 times. her data are charted below. throw length of string (feet) 1 3 2 1.8 3 1.08 jessa wants to find the sum of the length of string after 10 throws. what is the sum of the lengths, rounded to the nearest hundredth?