1. you have the following equation of the parabola in vertex form:
where h is the x-coordinate of the vextex and k is the y-coordinate of the vextex.
2. you know that the vertex of this parabola is at (-2, 5), then, susbtitute this point into the equation. then, you obtain:
3. therefore, the answer is the option c.
0.1 * x < = 5
x < = 50
the maximum number of letters he can have engraved is 50.
a) -1 - 3i