Chapter 8 - Complex Numbers, Polar Equations, and Parametric Equations - Section 8.6 Parametric Equations, Graphs, and Applications - 8.6 Exercises - Page 399: 41b

$y = 0.364~x-0.00234~x^2+2$

From Part (a): $x = 82.7~t$ $y = 30.1~t-16~t^2+2$ We can find an expression for $t$ in terms of $x$: $x = 82.7~t$ $t = \frac{x}{82.7}$ We can substitute this value in the equation for $y$: $y = 30.1~t-16~t^2+2$ $y = 30.1~(\frac{x}{82.7})-16~(\frac{x}{82.7})^2+2$ $y = 0.364~x-0.00234~x^2+2$