Which situation represents a constant rate of change of 50
miles per hour?
A 180 miles in 3 hours
B 300 miles in 5 hours
C 200 miles in 4 hours
D 100 miles in 3 hours

C, 200 miles in 4 hours

Step-by-step explanation:

You divide 200 by 4, then you get 50. 50 miles in 1 hour!

you should at least use a calculater

step-by-step explanation:

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.