Find the standard form of the equation of the parabola with a focus at (7, 0) and a directrix at x = -7.

a. y = one divided by twenty eightx2
b. x = one divided by twenty eighty2
c. -28y = x2
d. y2 = 14x

What is the standard deviation of the following data set rounded to the nearest tenth? 3, 17, 18, 15, 12, 21, 9

Refer to interactive solution 17.45 to review a method by which this problem can be solved. the fundamental frequencies of two air columns are the same. column a is open at both ends, while column b is open at only one end. the length of column a is 0.504 m. what is the length of column b?

Table which ratio is equivalent to 3: 7? 6: 7 3: 21 24: 56 15: 30