Sketch the linear function f(x) =
1
2
(3x + 1) - 1. which key feature of the graph is true?
a) y-intercept (0, −1)
b) x-intercept (
1
6
, 0)
c) x-intercept (
1
3
, 0)
d) y-intercept (0,
1
2
)

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