Triangle pqr is reflected across a line, p = (4,–5), and p’ = (–4, –5). what is the line of reflection?
a. the x-axsis
b. the y-axsis
c. the line y=x
d. the line y = -x

Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b

Anyone know these questions? i need ,.

In the diagram below,abc is congruent to dec what is the value of x