Which expression is equivalent to StartFraction 4 a 4 Over 2 a EndFraction times StartFraction a squared Over a 1 EndFraction? StartFraction 2 (a 1) squared Over a cubed EndFraction 6a 2a StartFraction 6 a squared Over a 1 EndFraction.

step-by-step explanation:

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.

to find the perimeter, you add up all the lengths of the sides. in this case you would have to add up 18+22+40+80 which equals 160.