How many tenths are there in 4/5

Find the third,fifth and seventh term sequence described by each rule a(n)=n+1

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2

1.two more than the quotient of a number and 6 is equal to 7 use the c for the unknown number translate the sentence into an equation