does “two radii” mean , 2+ radii because radii is the plural of radiuses ( sorry if this doesn’t make sense i’m confused )

Joanie watched 1 out of three of a movie in the morning

The cost of turkey is directly proportional to its weight. if a 12-pount turkey costs $27, how much does a 13-pound turkey cost? a. $33.75 b. $36.00 c. $31.00 d. $32.50

At saturday nights football game there were 18 less fans than half the fans at friday nights game. there were "x" fans at friday's game. write an expression to represent the number of fans at saturday's game. *** urgent***