Aparabola has a vertex at (0,0). the focus of the parabola is located on the positive y-axis.

in which direction must the parabola open?

up
down
left
right

The parabola must open up

Step-by-step explanation:

If you are doing process of elimination you would know that it is not going to be down or left because p is positive. Now the only options left are up and right. The parabola is not going to be opening to the right because that is on the x-axis. Therefore the parabola is opening to the right.

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.