Elena is 11. Elena walks home from school and lets herself into the house with her own house key. In this respect, Elena is similar to about what percentage of children in fourth through eighth grade?

Jack lives on a farm and has a large backyard. the area of his rectangular backyard is of a square mile. if the width of the yard is of a mile, what fraction of a mile is the length of the rectangular backyard?

At which value in the domain does f(x) =0?

If the measure of angle 1 is 110 degrees and the measure of angle 3 is (2 x+10 degree), what is the value of x?