Convert the polar representation of this complex number into its standard form: z=6(cos210°+ i sin210°)

A. -6-6i
B. 3- 3sqrt3i
C. -3 sqrt3-3i
D. -6 sqrt3 + 6i

Tamera puts 15/4 gallons of gasoline in her car. which mixed number represents the gallons of gasoline? a) 2 3/4 gallons b) 3 1/4 gallons c) 3 3/4 gallons d) 4 1/2 gallons answer it's worth a lot of points!

Icould really use some with this question.

Determine which postulate or theorem can be used to prove that lmn =nmo