Final answer:
The correct option is E). A typical variable cost, when graphed, appears as a diagonal line that slopes upward to the right, reflecting the increase in cost with higher levels of output. This is in contrast to average cost and marginal cost curves, which can be U-shaped.
Step-by-step explanation:
When graphed, a typical variable cost appears as a diagonal line that slopes upward to the right. This is because variable costs typically increase with the level of output. For instance, with each additional haircut a salon performs, costs for shampoo and electricity may go up, resulting in a higher variable cost as production increases. Thus, the correct answer is E. a diagonal line that slopes upward to the right.
It's important to note that average cost and marginal cost curves can be U-shaped, with the initial portion of the curve decreasing as fixed costs are spread out over more units of product and the later portion increasing due to rising marginal costs. However, in the context of variable costs alone, these tend to increase with output, and thus their graphic representation is a line rising from left to right.