A70% increase followed by a 50% decrease, is it greater than original, smaller or same as

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

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?

How can you write the expression with a rationalized denominator? 5−√2 √3