Tell whether the statement is always, sometimes, or never true. 13. A regular pentagon is concave.
14. A square is a regular polygon.
15. A dodecagon is convex. I
16. A triangle is equilateral but not equiangular.​

the correct answer is x/3+10≥32

hope this !

b mark me branliest thx

step-by-step explanation:

answer: cos [   arcsin (3/5) - arccos (1/2) ] =

step-by-step explanation: × = 3/5 = 0.6--> x = 36.87 and x = 180 - 36.87 = 143.13 deg

cos y = 1/2 --> y = +- 60 deg a. cos (x - y) = cos (143.13 - 60) = cos 83,13  

=

0.12

b. cos (36.87 - 60) = cos (-23.23) = 0.92