A(3, –8) and B(1, 2). what is the length of CD

Some boys and girls were asked if they had a pet. one third of the group were boys. there were 20 boys. 20% of the girls had a pet. boys with a pet : girls with a pet = 1 : 5 i need to know how many girls there are.

Write an equation of the line that passes through 9,2 and is parallel to the line y=5/3x+9

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)