The bar graph shows the numbers and colors of cars in a parking lot. The total number of silver and black cars equal the total number of red, white, and blue cars. How many black cars in the parking lot? A)9 , B) 10, C)15, D)30

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?