Which trigonometric expression has a negative? value? pls !

B. sin(5pi/4)= -(sqr2/2)

Step-by-step explanation:

B. sin(5pi/4)= -(sqr2/2)

Step-by-step explanation:

This is because its in the 3rd quadrant, meaning the coordinates will be ( - , - ).

Also if you want to think of it like this,

since pi/1 is equal to 180 degrees on the Unit Circle, you can consider 4 as 180 degrees, like this, 180/4=45, from this we can tell that "1" is equal to 45 degrees on the unit circle in this case. From this can we derive that 5 is 225 degrees around the Unit Circle, thus landing in the 3rd Quadrant.

*Use the attachment for reference.

my acc plz

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.