15. Simplify sin(90° - O) cos 0 - sin(180° +0) sin e.

 cos²(θ) + sin(θ)sin(e)

Step-by-step explanation:

sin (90° - θ)cos(Ф) - sin(180° + θ) sin(e)

Note the following identities:

sin (90° - θ) = cos(x)

sin (180° + θ) = -sin(x)

Substitute those identities into the expression:

   cos(x)cos(x)  -  -sin(x)sin(e)

=  cos²(x) + sin(x)sin(e)

3x + 4y -25 =0 represents the amount of change sianna should recieve

what graph

step-by-step explanation: