What quadrilateral had at least one pair of parallel sides but cannot be called a parallelogram?

The trapezoid.

Step-by-step explanation:

A parallelogram is only crafted with parallel pairs, so here we have a parallel pair and other that is not parallel.

This is the trapezoid, where the base and the top are parallel (where one is larger than the other) and the other two sides are tilted connecting the base with the top, and because the base length and the top length are different, the other two sides can not be parallel.

answer: the price of one pound cabbage = $ 0.8

the point (10,8) represents that the cost of 10 pounds cabbage is $ 8

step-by-step explanation:

since, here is a proportional relation between the number of pounds of cabbage (x) and the price in dollars (y).

therefore, we can write,

⇒ y = k x

where k is the constant of proportionality.

now, point (5,4) is in the line.

thus, it will satisfies the above equation of line.

⇒ 4 = 5 k

⇒ k = 0.8

thus, the equation of the line is,

y = 0.8 x

a) for x = 1,

y = 0.8

therefore, the cost of one pound of cabbage is 0.8 dollars.

b) in the below graph (10,8) represents that the cost of 10 pounds of cabbage is 8 dollars.