Use finite differences to determine the degree of the polynomial x -2 -1 0 1 2 3
y 22 16 10 4 -2 -8​

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.