ElectricPavlov

8l + 10 d = 28

3l + 10 d = 23       subtract this equation from the first one to get

5 l  = 5

l = laundry = 1 dollar       then use this value ineither equation to calculate d

    8 (1) + 10 d = 28

         d = dishes = 2 dollars  

Supondo que esses sejam os comprimentos laterais do retângulo :

Area = a * b

        30 mm * 50 mm = 1500 mm²

YEP...I missed that !   THANX     I edited my answer .....   ~ EP

Arrange in standard circle form to find r^2     first divide by 2

x^2 + 5x     + y^2  - 3y   = 24        complete the square for x and y

(x+ 2.5)^2   + ( y - 1.5)^2   = 24 + 6.25 + 2.25

                                              r^2 = 32.5                        pi r^2 = area = 32.5 pi units2       *** edited ***   to fix error noted by  catmg !

(1) x^3    + 5x^3   =   6 x³

16/56 = 2/7         x⁷ / x⁴      =  x^7-4 = x³

2x³ / 7

(x+3)^2 =(x+3)(x+3)  =  x^2 + 6x + 9   

You don't have the diagram included.....    Generally a square will enclose the max area.... if one side is a building, then a square with 148/3 = 49 1/3 ft sides would be the biggest .....   area would be     49 1/3 * 49 1/3   ft²

Expanding and simplifying results in   5 x^2 + 20 x + 282         min occurs at x = - b/2a = -2 

   sub in that value for 'x' to calcualte the min value of the fxn = 262   

Arrange in standard circle form to find r^2     first divide by 2

x^2 + 5x     + y^2  - 3y   = 48      complete the square for x and y

(x+ 2.5)^2   + ( y - 1.5)^2   = 48 + 6.25 + 2.25

                                              r^2 = 56.5                        pi r^2 = area = 56.5 pi units²