Which expression is equivalent to x2+7x+12/x2-x-12? x+3/x-3
x+4/x-4
(x+3)(x+4)/(x-3)(x-4)
(x-3)(x-4)/(x+3)(x+4)

the answer is this hope it helps

x+4/x-4

Step-by-step explanation:

x2+7x+12/x2-x-12

Factor the expressions that are not already factored.

(x+3)(x+4)/(x-4)(x+3)

Cancel out x+3 in both numerator and denominator.

x+4/x-4

Graph if needed:

step-by-step explanation:

659

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.