Which equation of the least squares regression line most closely matches the data set? yˆ=−0.31x+37.3

yˆ=−0.09x+11.5

yˆ=−10.1x+118.8

yˆ=−2.3x+97.9

a complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is a solution of the equation x2 = −1. because no real number satisfies this equation, i is called an imaginary number. has no real solution, since the square of a real number cannot be negative.