Among all rectangles that have a perimeter of 90, find the dimensions of the one whose area is largest. Write your answers as fractions reduced to lowest terms.

the answer will be b x² +x-1

step-by-step explanation:

there still no table

let x and 400 - x be the two numbers.  

==> 0.80x + 0.85(400 - x) = 400 - 68 from the statement of the problem.  

< ==> 0.80x + 0.85(400 - x) = 400 - 68  

==> 340 - 0.05x = 332  

< ==> -0.05x = -8 ==> x = 160, the first number ==> 400 - x = 240, the second number.