By what percent will the product of two numbers decrease if one of them is decreased by 20% and the other is decreased by 60%?

We have:

P1  = a x b

If a decreases by 20% and b decreases by 60%, then we have:

P2 = a x (100 - 20)/100 x b x (100 - 60)/100

     = a x 80/100 x b x 40/100

     = a x b x 8/25

=> P1 - P2 = ab - (8/25)ab = (17/25)ab

=> If a decreases by 20% and b decreases by 60%, product of a and b would decrease 17/25 = 0.68%

Hope this helps!

:)

answer rather than having to add and subtract the measurements of the semi-circle, notice that the semicircle to the left of ad is actually identical in area to the blank semicircle-shaped space to the left of bc. so if we transferred the red semicircle into the blank space, we would end up with a square of side length 24 cm. the area of a square is s^2 = 24^2 = 676 cm^2.

u also answered this so i think u would know but i am here to

put in or use mine

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