What is the quadratic regression equation that fits these data

A. Y=-1.04x^2+3.04x+9.68

B. Y=-2.04x^2+1.46x+13.92

C. Y=-0.70x^2+2.37x+11.96

D. Y=14.77(0.89^x)

The function ƒ is defined by ƒ(x) = (x + 3)(x + 1). the graph of ƒ in the xy-plane is a parabola. which interval contains the x-coordinate of the vertex of the graph of ƒ?

Asurvey of 45 teens found that they spent an average of 25.6 hours per week in front of a screen (television, computer, tablet, phone, based on the survey’s sample mean, which value could be the population mean? 2.3 hours 27.4 hours 75.3 hours 41.5 hours

Use sigma notation to represent the following series for 9 terms.