A landscaper estimated the height of a tree to be 6 m. The actual height of the tree was 5.6 m. Find the absolute error and the percent error of the landscaper's estimate.

If f(x)=x^3 and g(x)=2x+7 when g(x)=-5

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.

The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?