Indicate whether each item described contains parallel lines or perpendicular lines.
a. the back and side edge of a filing cabinet
b. two walls facing each other in a square room
c. the hands of the clock at 3: 00
d. two straight telephone poles on flat ground
e. the hands of the clock at 9: 00

A: Perpendicular; the two sides eventually meet

B: Parallel; the two sides NEVER meet

C: Perpendicular; the two sides meet

D: Parallel; they NEVER intersect together

E: Perpendicular; the two hands meet

Step-by-step explanation:

Parallel lines are like train tracks. They NEVER meet or intersect at any point

Perpendicular lines intersect at some point unlike parallel lines.

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.