A bridge stretching 100 yards has support pillars spaced 10 yards apart from the beginning to the end of the bridge. How many pillars are needed?

Adj has a total of 1075 dance and rock songs on her system. the dance selection is 4 times the size of the rock selection. write a system of equations to represent the situation.

Kai walked one and two-thirds of a mile on saturday and four and one-sixth of a mile on sunday. how many miles did kai walk?

The area of a circle is equal to 1 dm². find the radius of the circle.