Plzz help mi chemists​

Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh

What effect might melting sea ice have for people who live in coastal areas?

Clyde and marilyn are riding a roller coaster. during which section(s) of the track is their potential energy converted to kinetic energy? a. from point b to point c only b. from point b to point d only c. from point a to point b only d. from point a to point b and from point c to point d