11. Since 2006, the water level in a certain pond has been modeled by the polynomial
d(x) = -x + 16x2 - 74x + 140, where the depth
d, is measured in feet over x years. Identify the
year that the pond will dry up. Use the graph to
factor d(x).

Idon’t know what the answer is i wish i could

Period is the time it takes for one “cycle” to complete. in the parent sine function, period is 2*pi since sin(0) = 0, sin(pi/2) = 1, sin(pi) = 0, sin(3pi/2) = -1, and sin(2pi) = 0. at that point, the sequence repeats itself. i’m not sure if your graph is similar to the sine function since you didn’t provide a picture, but you can find the period by looking at a graph.