Explain the difference between (-10)2 and -102. what are the values of each expression?

The answer is in the explanation, parentheses are very important

Step-by-step explanation:

(-10)2 you use distribution so it will be -20

and the -102 would just be some number if with out the parentheses

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.