Can someone solve this?

First question:

Recall that and for all . So

For , we expect both and (i.e. the sine and cosine of any angle that lies in the first quadrant must be positive). By definition of absolute value, if .

So we have

making H the answer.

Second question:

C is always true, because the inequality reduces to x > y.

Subtract him from your life

Best answer that i found on yahoo ok   set :   x= length of 2nd piece in cm  x- 3= length of 1st piece in cm  x-4= length of 3rd piece in cm  then since you know they all came from the 20 cm ribbon you add them together and set them equal to 20x+ x-3 +x-4 = 20  3x - 7= 20  3x= 27  x= 9  the shortest piece is the third piece which is x- 4  x-4  9-4 = 5  the length of the smallest piece is 5 cm.  the other lengths are  9 cm  6 cm