- What is the principle of pulse measurement ?

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What is the surface area of a cylinder with holes in the side? Can an MRI detect torn ligaments in the lower back? What's the first digit of Pi? The function f is f(x)= (x+4)(x-a), the graph of f is a parabola , a is const. The x coord. is b/w 1 and 3, which is a?
A. -2
B. 1
C. 5
D. 9? What are the coordinates of the vertex of the parabola represented by the equation y= −5x2 + 30x−25 ?