Chapter 9 - Quadratic Functions and Equations - 9-7 Linear, Quadratic, and Exponential Models - Standardized Test Prep - Page 580: 28

A

Points include $(1,800)$ and $(3, 600)$ D: $y=-50x^2-400x+1300$ $600=-50*3^2-400*3+1300$ $600=-50*9-1200+1300$ $600=-450+100$ $600\ne350$ B: $y=900*.875^x$ $600=900*.875^3$ $600=900*.6699$ $600 \approx602.92$ $y=900*.875^1$ $800 = 900*.875$ $800 \ne 787.5$ C: $y=-100x+800$ $800\ne-100*1+800$ $800\ne-100+800$ $800\ne700$