Suppose we have two stacks of 20 coins each, as shown in the figure. which stack, the right cylinder or oblique cylinder, has the greater volume?

They both have same volume. after all they both have 20 coins and assuming each coin has same volume, then how can 20 coins in 1 stack have different volume than 20 coins in another stack no matter how you stack them

in general two cylinders with same base area and vertical height have same volume even if one is oblique and the other is a right cylinder. 
this is like a rectangle and parallelogram with same base and same perpendicular height having same area

both graphs increase on their domain

neither graph has a y-intercept

step-by-step explanation:

the following points can be visualized easily from the graph

there is a hike in both the graphs so the graphs are increasing on their domain.x-intercept of log x and log 6x are differentthere is a vertical asymptote of both the graphs so there is no y-interceptas both the graphs are increasing so there is no horizontal asymptote