If q is inversely proportional to r squared and q=30 when r=3, find r when q=1.2

r = 3

Step-by-step explanation:

q = k /

k = q = 1.2 x 3 x 3 = 10.8

q = 10.8/

1.2 = 10.8/

r = = 3

r=225

Step-by-step explanation:

first you have to find q, so set that up and get 30=k/9

times both sides by 9 and get

270=k

the plug into the best equation

1.2=270/r

times r on both sides

1.2r= 270

divide by 1.2

r=225

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.

the answer is 48m^2!

step-by-step explanation: