What is the x-value of the vertex of f(x) = x2 - 10x + 3 ?

I'm being volume of cylinder with 13 in. radius and 30 in height answer choices in pic

Cherie measures and records the lengths and sizes of the same style of a sandal found at a shoe store. which equation can be used to determine the approximate shoe size, s, for a foot length of x inches? s = x – 2 s = 2x – 10 s = x + 6 s = 2x + 4

Find the equation using the point (4,8)