Which describe unit rates? Check all that apply. Nadia pays $30 for 2 baseball tickets. A certain type of sailboat travels at 7 nautical miles per hour. The cost of 3 hot chocolates is $2. A summer camp provides 3 meals for each camper.

A certain type of sailboat travels at 7 nautical miles per hour.

A summer camp provides 3 meals for each camper.

Step-by-step explanation:

Unit rate shows the number of units of first quantity corresponding to one unit of second quantity,

Nadia pays $30 for 2 baseball tickets.

i. e. the number of dollars is 30 per 2 baseball tickets,

By the above definition,

It is not a unit rate,

A certain type of sailboat travels at 7 nautical miles per hour.

i. e. the number of nautical miles is 7 per 1 hour,

By the above definition,

It is a unit rate,

The cost of 3 hot chocolates is $2.

i. e. the number chocolate is 3 per 2 dollars,

By the above definition,

It is not a unit rate,

A summer camp provides 3 meals for each camper.

i. e. the number of meal is 3 per 1 unit of camper,

By the above definition,

It is a unit rate

the anwer is b, d