Which of the following are NOT trigonometric identities? Check all that apply. A.
4cosx sinx=2cosx+1-2sinx

B.
1-tanxtany=cos(x+y)/cosxcosy

C.
tanx cosx cscx=1

D.
Secx-cosx/secx=sin^2x

Solve - pv + 40 < 65 for v solve 7w - 3r = 15 for r

Gretchen is setting up for a banquet. she has 300 chairs and needs to distribute them evenly among t tables. how many chairs should she put at each table? write your answer as an expression.

Fa bus driver leaves her first stop by 7: 00 a.m., her route will take less than 37 minutes. if she leaves after 7: 00 a.m., she estimates that the same route will take no less than 42 minutes. which inequality represents the time it takes to drive the route, r?