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75 in³

x:   30

y:  20    35

Step-by-step explanation:

v = πr²h / 3

v = 3.14 * 3² * 8 / 3

v = 3.14 * 9 * 8 / 3

v = 75.36 in³

Rounded

v = 75  in³

x increase by 10 for each step

y increases by 7.5 for each step

x:   0    10      20    30     40

y:   5    12.5   20   27.5   35

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.