Provide IUPAC name: - assign cis/trans or E/Z if necessary

please draw 3 and name

Three structural isomers have the formula C_{5}*H_{12} Draw and name the isomers using IUPAC names. Use a hyphen (-) where necessary, not an en-dash )  Draw the isomer with 5 carbon atoms in main chain.

2) For the following steroid skeleton: Me 11H H7 Ét a) If a substituent is placed at C-11 in the equatorial position, is this substituent cis or trans to the methyl group? b) If a substituent is placed at C-7 in the axial position, is this substituent cis or trans to the ethyl group? c) If a substituent is placed at C-1 trans to the methyl group, is this substituent axial equatorial?

ASAP

Give the IUPAC name, include alkene cis or trans please.