For each set of angles or sides lengths, determine whether they could form a unique triangle, more than one triangle, or no triangle. 5 cm, 10 cm, 12 cm

8 ft, 12 ft, 20 ft

40°, 50°, 80°

28°, 51°, 101​

At the movie theatre, child admission is $5.20 and adult admission is $9.70. on sunday three time as many adult tickets as child tickets were sold, for a total sales of $788.90. how many child tickets were sold that day?