Find the variable. Please explain.

the variable is the b.

Step-by-step explanation:

A variable is an unknown number or value represented by a letter. If there was an equation x+2=19, then x would be the variable, because it is a letter representing an unknown value

18a

step-by-step explanation:

simply because it is. it's the highest common factor

step-by-step explanation:

through just a quick inspection, one can see that the graph of this cubing function starts in quadrant iii and ends in quadrant i.   when x = 0, y = 3, so the y-intercept is (0, 3).

if graphs are part of the problem statement, share them.   .