Which expression is equivalent to cos( pi/2+ r) for all values of r? sin(r)
cos(r)
-sin(r)
-cos(r)

In the equations, a and b represent the price per night for a room in hotel a and hotel b, respectively, w weeks after september 1 last autumn. what was the price per night in hotel a when it was equal to the price per night in hotel b? a = 240 − 20w b = 320 − 30w

The la dodgers hit the most homeruns in 2014. the number of homeruns accounted for 6% of the entire major leauge baseball homerun count. if 583 total homeruns were hit, approximately how many did the la dodgers hit

On a piece of paper, graph y< x+1. then determine which answer matches the graph you drew.