Give the line-angle structure and the systematic name of the compound described below:
A 7-membered cycloalkane with the molecular formula of C₁₀H₂₀. (Assume only 1 straight-chain substituent.)

Line-angle structure of propylcycloheptane, a 7-membered cycloalkane.

Line-angle structure of ethylcyclooctane, a cyclic alkane with 8 carbon atoms.

Line-angle structure of propylcycloheptene, a 7-membered cycloalkene.

Line-angle structure of ethylcyclooctene, an 8-membered cyclic alkene.

Give the line-angle structure and the systematic name of the compound described below:A 7-membered cycloalkane with the molecular formula of C10H20. (Assume only 1 straight-chain substituent.)