Set 11: Quadratic Equations

Choice A is correct. Choice A is the correct answer. We are given $d = 64$ and need to find $t$. 1. Substitute $d=64$: $64= 16 t^2$. 2. Divide by 16: $4= t^2$. 3. Take the square root: $t = \pm 2$. Since time cannot be negative, $t = 2$ seconds. Choice B is incorrect because $16(4)^2 = 256$. Choice C is incorrect because $16(8)^2 = 1024$. Choice D is incorrect because it solved linearly $16t = 64$.