Answer:
a. Two quantities have a proportional relationship if they can be expressed in the general form y = kx, where k is the constant of proportionality. In other words, these quantities always maintain the same ratio. That is, when you divide any pair of the two values, you always get the same number k.
b. These and other questions are answered in this summary of the types of pitches in baseball. Also, Yankee pitchers Kevin Whelan and DJ Mitchell demonstrate the proper grip on the baseball for different types of pitches.
Step-by-step explanation:
