Which expression is equivalent to this polynomial? 9x^2 + 4

A. (3x + 2i)(3x − 2i)
B. (3x + 2)(3x − 2)
C. (3x + 2i)^2
D. (3x + 2)^2

A. (3x + 2i)(3x − 2i)

I hope this helps.

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?