1.) C. y=x^2 It makes a parabola( a "U" shape)
2.) C. Since it was subtracting by 4n The sequence goes down by 4.
3.) B. The 7 inches is the original height of the candle and does not change. The 2 is negative as it is the decrease in inches per hour. y = 7 - 2x. The variable is what indicates the change.
4.) D. y = 8x. The 8x is the slope. It can be rewritten as 8/1 It is rise over run. It goes up 8 and over 1(as there is no number higher than 1).