If the scale factor between two circles is 7a/9b what is the ratio of their areas?

a. 49a/81b
b. 49a2/81b2
c. 81b2/49a2
d. 81b/49a

 The correct option is (B)

Step-by-step explanation:  Given that the scale factor between two circles is .

We are to find the ratio of the areas of the two circles.

Let r and R be the radii of the two circles and A and B be the corresponding areas.

We know that the scale factor is the ratio of the radii of the two circles.

So, we have

Thus, the required ratio of the areas of the two circles is

Option (B) is CORRECT.

answer: answer

step-by-step explanation:

use an equation of ratios to determine the amount of gas needed to fill the tank.

    0.2             0.8

  =    

288.75             x

                                                              231 gal

so, 0.2x = (0.8)(288.75 gal), and x = = 1155 gal.

                                                                0.2

it would take 1155 gal. to fill the tank.

the cost would be

1155 gal         $3

* = $3465   (answer)

      1           1 gal

hope this you