The vertex of the parabola below is at the point (2,-4). Which of the following could be this parabola's equation?
10
10
1(2,-4)
- 10 -
O A. y=x²
B. y= (x - 2)2 - 4
O c. y= 4x2 + 4
OD. y= (x + 2)2 + 4

In triangle abc segment de is parallel to the side ac . (the endpoints of segment de lie on the sides ab and bc respectively). find de, if ac=20cm, ab=17cm, and bd=11.9cm;

Suppose that the price p, in dollars, and the number of sales, x, of a certain item follow the equation 4 p plus 4 x plus 2 pxequals56. suppose also that p and x are both functions of time, measured in days. find the rate at which x is changing when xequals2, pequals6, and startfraction dp over dt endfraction equals1.5.

Which strategy is used by public health to reduce the incidence of food poisoning?