The answer is the 2nd choice, number of sales.
The function described f(x) = B + Cx
Answer:
feldspar, because it has a higher number then gypsum and apatite, and it can be scratched by quartz because it has a lower number.
4pi/2pi = x/360
use a proportion
2 radians equals 360 degrees
x = 720 degrees
Need the choices cant really answer your question
