Mr. Johnson listed each class’s average on a quiz in fraction form. Based on the chart, Which shows the classes ordered from the highest average to the lowest average? A. C, D,A, B
B. C, A,D, B
C. B, D,A, C
D. B. A,D, C

step-by-step explanation:

its 512 because parenthesis and to the 2nd power is 512 so it will be 512

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.

the answer is d

step-by-step explanation:

you can also use mathway to get you answer + steps