If angle x is in the fourth quadrant and angle y is in the first quadrant, the value of cos(x-y) is

-y) = cos x cos y + sin x sin y becomes, in terms of sign,

         cos(x-y) =   (Note that cos(x-y) = cos x cos y + sin x sin y.

If angle x is in the fourth quadrant, then sin x is positive and cos x is negative.

If angle y is in the first quadrant, then sin y is positive and cos y is positive.

Then cos(x-y) becomes, in terms of sign:

                                        (-)(+) + (+)(+), or

                                          (-)   +   (+)

This would be positive, overall, if cos x cos y < sin x sin y.

1/2

Step-by-step explanation: I got this right on Edmentum.

sas (side angle side)

aa (angle angle)

sss(side side side)

sas find two sides with an angle in between

aa is finding two angles and the third will add up to 180

sss find all sides

step-by-step explanation:

y=-2.5x+12.5

step-by-step explanation:

5y=2x+10

y=0.4x+2

slope=-2.5

5=-2.5*3+b

b=12.5