Which is true about the domains and ranges of the function f(x)= 1/8 /x and g(x)= 8/x

Aman is 6 feet 3 inches tall. the top of his shadow touches a fire hydrant that is 13 feet 6 inches away. what is the angle of elevation from the base of the fire hydrant to the top of the man's head?

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?

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.