Please help best one gets brainlist and 5/5

What is the area of the triangle 10 13 12

Iwill give you ! what is the measure of ∠v ?

The line plot below represents the number of letters written to overseas pen pals by the students at the waverly middle school. each x represents 10 students. how many students wrote more than 6 and fewer than 20 letters. a.250 b.240 c.230 d.220