How will u change 3 5/8 to a decimal

"princess tower" in dubai is considered the world's tallest residential building, towering to 1 0 1 101 floors! t ( n ) t(n) models the number of tenants living on floor n n of the tower. what does the statement t ( 2 0 ) = t ( c ) t(20)=t(c) mean?

Find the difference (8ab+a+2) - (3ab+6)

We just started the introduction into circles and i have no idea how to do this.