Question 8 of 10 What does it mean to be a unit of account?
A. Any item can be traded for another item
B. it serves as a valid currency
C. the item is divisible and each unit is worth the same
D. Any item that maintains it’s worth overtime

Ineed to know the answer to this algebra question.

2. explain in words how you plot the point (4, −2) in a rectangular coordinate system.

Astudent draws two parabolas on graph paper. both parabolas cross the x-axis at (–4, 0) and (6, 0). the y-intercept of the first parabola is (0, –12). the y-intercept of the second parabola is (0, –24). what is the positive difference between the a values for the two functions that describe the parabolas? write your answer as a decimal rounded to the nearest tenth